KR101772765B1 - Treatment system of liquefied natural gas - Google Patents

Abstract

A liquefied gas processing system according to an embodiment of the present invention includes: a first flow path in which liquefied gas stored in a liquefied gas storage tank is supplied to a first customer; A second flow path in which evaporative gas generated in the liquefied gas storage tank is supplied to the first customer; A third flow path in which evaporated gas generated in the liquefied gas storage tank is supplied to a second customer; And an amount of evaporation gas in the liquefied gas storage tank, which is required for generating the electric power used in the ship, is the first demanded amount of gas required for the first demanded customer, And a control unit for controlling at least one of a flow of the fluid in the first flow path or the flow path of the third flow path.

Description

[0001] The present invention relates to a treatment system of liquefied natural gas,

The present invention relates to a liquefied gas processing system.

A ship is a means of transporting large quantities of minerals, crude oil, natural gas, or more than a thousand containers. It is made of steel and buoyant to float on the water surface. ≪ / RTI >

Such a ship generates thrust by driving the engine. At this time, the engine uses gasoline or diesel to move the piston so that the crankshaft is rotated by the reciprocating motion of the piston, so that the shaft connected to the crankshaft is rotated, .

In recent years, however, LNG fuel supply systems for driving an engine using LNG as a fuel have been used in an LNG carrier carrying Liquefied Natural Gas (LNG) It is also applied to other ships.

Generally, it is known that LNG is a clean fuel and its reserves are more abundant than petroleum, and its usage is rapidly increasing as mining and transfer technology develops. This LNG is generally stored in a liquid state at a temperature of -162 ° C below 1 atm under the pressure of 1 atm. The volume of liquefied methane is about 1/600 of the volume of the gaseous methane in the standard state, Is 0.42, which is about one half of the specific gravity of crude oil.

However, the temperature and pressure required to drive the engine may be different from the state of the LNG stored in the tank. Therefore, in recent years, various technologies for controlling the temperature and pressure of the LNG stored in the liquid state and supplying the engine to the engine have been continuously researched and developed.

It is an object of the present invention to provide a liquefied gas processing system in which a liquefied gas storage tank and a liquefied gas storage tank are efficiently processed and liquefied gas processing is simplified .

The liquefied gas processing system according to the present invention comprises a first flow path in which liquefied gas stored in a liquefied gas storage tank is supplied to a first customer; A second flow path in which evaporative gas generated in the liquefied gas storage tank is supplied to the first customer; A third flow path in which evaporated gas generated in the liquefied gas storage tank is supplied to a second customer; And an amount of evaporation gas in the liquefied gas storage tank, which is required for generating the electric power used in the ship, is the first demanded amount of gas required for the first demanded customer, And a control unit for controlling at least one of a flow of the fluid in the first flow path or the flow path of the third flow path.

Specifically, when the amount of gas required for the first demanding customer is larger than the amount of evaporation gas generated in the liquefied gas storage tank, the control unit controls the liquefied gas in the liquefied gas storage tank to flow to the first demander And the evaporation gas of the liquefied gas storage tank is supplied to the second customer through the third flow path when the amount of the first demanded gas required by the user is smaller than the amount of evaporation gas generated by the liquefied gas storage tank .

Specifically, the first flow path includes a pump driven by varying a pressure or a flow rate of the liquefied gas discharged in accordance with the supply of electric power, and the third flow path includes a vaporizing gas for regulating the supply to the second customer And a control unit for controlling the amount of evaporation gas in the liquefied gas storage tank so that the amount of evaporation gas in the liquefied gas storage tank is equal to the amount of evaporation gas in the liquefied gas storage tank, Wherein the pump is supplied to the first customer, and when the amount of gas required for the first customer is less than the amount of evaporated gas in the liquefied gas storage tank, the difference between the evaporated gas generation amount of the liquefied gas storage tank and the first- Can be supplied to the second customer through the evaporative gas discharging means.

Specifically, the control unit may include: a first control unit for comparing the amount of the first demanded gas required by the user with the amount of evaporated gas generated in the liquefied gas storage tank to instruct control of the flow of the fluid in the first flow path and the second flow path; A second control unit for controlling the flow of the fluid in the first flow path; And a third control unit for controlling the flow of the fluid in the second flow path or the third flow path.

Specifically, the first controller calculates an amount of the first demanded gas required by the user, and when the amount of the first demanded gas required by the user is larger than the amount of evaporated gas generated in the liquefied gas storage tank, And instructs the second and third controllers to issue a second command when the first demand source gas amount is less than the evaporation gas generation amount of the liquefied gas storage tank.

Specifically, the first command causes the second control unit to supply the liquefied gas in the liquefied gas storage tank to the first customer through the first flow path, and the third control unit causes the third flow path to shut off And the second command is a command to shut off the first flow path to shut off the evaporation gas of the liquefied gas storage tank from being supplied to the second customer, Gas from being supplied to the first customer, and the third control unit may supply the evaporative gas of the liquefied gas storage tank to the second customer through the third flow path.

Specifically, the first flow path includes: a pump driven by varying a pressure or a flow rate of the liquefied gas discharged according to supply of electric power; And a vaporizer for vaporizing the liquefied gas supplied through the pump, wherein the second flow path includes an evaporative gas compressor for multi-stage compressing the evaporation gas generated in the liquefied gas storage tank, And an evaporating gas discharging means for controlling the supply to the second customer, wherein the first inlet is provided at an inlet end of the first consumer, and when the inlet pressure of the first consumer is a first pressure, Wherein the control unit controls the amount of the first demanded gas required by the user and the amount of evaporated gas generated in the liquefied gas storage tank when the amount of the first demanded gas required by the user is larger than the amount of evaporated gas generated in the liquefied gas storage tank And the pump is supplied to the first customer, and the first pressure measured by the pressure measuring device is higher than the pressure demanded by the first customer The pump is operated to increase the discharge flow rate of the pump and to decrease the discharge flow rate of the pump when the first pressure is higher than the pressure demanded by the first customer, The amount of evaporated gas generated in the liquefied gas storage tank and the amount of the required amount of the first demanded gas may be supplied to the second customer through the evaporated gas discharging means.

The liquefied gas processing system according to the present invention can prevent the waste of the liquefied gas by treating the evaporated gas through the recondenser and can guarantee the optimized use and reduce the construction required for processing the evaporated gas, And the space inside the ship can be efficiently used.

1 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.
2 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.
3 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.
4 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.
5 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.
6 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.
7 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.
8 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.
9 is a PQ graph derived by a pump according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc. In the case where the gas is not in a liquid state by heating or pressurization, . This also applies to the evaporative gas. In addition, LNG can be used to encompass both NG (natural gas), which is a liquid state, and NG, which is a supercritical state for the sake of convenience. The LNG may be used to mean not only a gas state evaporation gas but also a liquefied evaporation gas .

FIG. 1 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.

1 and 2, a liquefied gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a first pump 11, an evaporative gas compressor 20, The evaporator 100 is connected to the condenser 30, the second pump 40, the vaporizer 50, the first customer 60, the second customer 61, the controller 90, the evaporator gas discharge valve 112, ).

In the embodiment of the present invention, a ship (not shown) may be a container ship or a bulk line, but is not limited thereto.

Hereinafter, a liquefied gas processing system 1 according to an embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig.

In the embodiment of the present invention, it may further include first to fourth lines L1 to L4. Valves (not shown), which are adjustable in opening degree, may be installed in each line, and the supply amount of the evaporation gas or liquefied gas may be controlled according to the opening degree of each valve.

The first line L1 connects the liquefied gas storage tank 10 and the recondenser 30 and can include the first pump 11 and the liquefied gas of the liquefied gas storage tank 10 can be supplied to the first Can be supplied to the recondenser (30) through the pump (11).

The second line L2 connects the liquefied gas storage tank 10 and the recondenser 30 and can comprise an evaporative gas compressor 20 and is adapted to supply the evaporated gas from the liquefied gas storage tank 10 to the evaporation gas Can be supplied to the recondenser (30) through the compressor (20). At this time, the second line L2 may be connected in parallel to the recondenser 30 in the liquefied gas storage tank 10, and the second line L2 formed in parallel may be connected to the evaporative gas compressor 20 And the evaporation gas compressor 20 may also be constructed in parallel.

The third line L3 connects the recondenser 30 to the first consumer 60 and may comprise a second pump 40 and a vaporizer 50 and is recycled in the recondenser 30, The liquefied gas or the evaporated gas can be pressurized to a high pressure through the second pump 40 and the vaporizer 50 and then vaporized and supplied to the first consumer 60. [ The third line L3 may be connected in parallel between the re-condenser 30 and the vaporizer 50, and the second pump 40 may be connected to the third line L3 formed in parallel. And the second pump 40 may also be configured in parallel.

The fourth line L4 connects the evaporative gas compressor 20 and the second consumer 61 and branches between the evaporative gas compressor 20 on the second line L2 and the recondenser 30, And can be connected to the customer 61. At this time, the fourth line (L4) can supply the evaporated gas compressed by the evaporative gas compressor (20) to the second customer (61).

The liquefied gas storage tank 10 stores a liquefied gas or an evaporated gas to be supplied to the consumers 60 and 61. The liquefied gas storage tank 10 must store the liquefied gas in a liquid state, at which time the liquefied gas storage tank 10 may have the form of a pressure tank.

In this embodiment, the evaporative gas generated due to the evaporation of the liquefied gas in the liquefied gas storage tank 10 is supplied to the evaporative gas compressor 20 to be described later, and the liquefied gas stored in the liquefied gas storage tank 10, It is possible to efficiently manage the evaporated gas.

Here, the liquefied gas storage tank 10 may include an outer tank (not shown), an inner tank (not shown), and a heat insulating portion (not shown).

The outer tank is a structure that forms the outer wall of the liquefied gas storage tank 10, and may be formed of steel, and may have a polygonal cross section.

The inner tank is provided inside the outer tank, and can be supported and supported inside the outer tank by a support (not shown). At this time, the support may be provided on the lower end of the inner tank, and may be provided on the side of the inner tank for suppressing lateral movement of the inner tank.

The inner tank can be made of stainless steel and can be designed to withstand pressures from 5 bar to 10 bar (6 bar, for example). The reason why the inner tank is designed to withstand such a constant pressure is that the inner pressure of the inner tank can be increased as the liquefied gas contained in the inner tank is evaporated and the evaporation gas is generated.

A baffle (not shown) may be provided in the inner tank. The baffle means a plate in the form of a lattice. As the baffle is installed, the pressure inside the tank can be evenly distributed to prevent the tank pressure from being concentrated to a part of the tank.

The heat insulating portion is provided between the inner tank and the outer tank and can prevent the external heat energy from being transmitted to the inner tank. At this time, the heat insulating portion may be in a vacuum state. By forming the thermal insulation in a vacuum, the liquefied gas storage tank 10 can withstand higher pressures more efficiently than a conventional tank. For example, the liquefied gas storage tank 10 can sustain a pressure of 5 to 20 bar through the vacuum insulation.

The evaporation gas discharge valve 112 is provided on the second line L2 so as to be close to the liquefied gas storage tank 10 and the evaporation gas generated in the liquefied gas storage tank 10 through the opening control is supplied to the second line (L2).

The evaporation gas discharge valve 112 may be connected to a control unit 90, which will be described later, in a wired or wireless manner, and may receive the opening adjustment signal from the control unit 90 to perform opening adjustment.

The evaporation gas isolation valve 113 is provided at a position where the fourth line L4 is branched on the second line L2 and may be a three-way valve. The evaporation gas separation valve 113 is controlled such that the evaporation gas discharged from the evaporation gas compressor 20 through the opening degree is supplied to the second customer 61 through the fourth line L4, To the re-condenser (30).

The evaporation gas isolation valve 113 may be connected to a control unit 90 to be described later, either wired or wirelessly, to perform opening control by receiving an opening control signal from the control unit 90.

The first pump 11 can first pressurize the liquefied gas stored in the liquefied gas storage tank 10 and supply it to the recondenser 30. Specifically, the first pump 11 is provided between the liquefied gas storage tank 10 and the recondenser 30 on the first line L1, and supplies the liquefied gas stored in the liquefied gas storage tank 10 to the re- (30).

The first pump 11 may be provided inside the liquefied gas storage tank 10 or may be provided at a position lower than the level of the liquefied gas stored in the liquefied gas storage tank 10, have.

The first pump 11 can pressurize the liquefied gas stored in the liquefied gas storage tank 10 to 6 to 8 bar and supply it to the recondenser 30. [ Here, the first pump 11 can pressurize the liquefied gas discharged from the liquefied gas storage tank 100 to slightly increase the pressure and the temperature, and the liquefied gas pressurized by the first pump 11 is still in the liquid state Lt; / RTI >

The evaporative gas compressor (20) pressurizes the evaporative gas generated in the liquefied gas storage tank (10). Specifically, the evaporative gas compressor 20 is provided between the liquefied gas storage tank 10 and the recondenser 30 on the second line L2, and the evaporated gas discharged from the liquefied gas storage tank 10 Can be pressurized to about 6 to 8 bar and supplied to the recondenser (30).

A plurality of evaporation gas compressors 20 may be provided to press the evaporation gas at multiple stages. For example, three evaporation gas compressors 20 may be provided to pressurize the evaporation gas at three stages. The example three-stage compressor is only one example and is not limited to the three stages.

At this time, the evaporative gas compressor 20 can pressurize the evaporative gas of about 1 bar to 2 bar to about 6 to 8 bar by the LD (Low Duty) compressor, and is supplied to the recondenser 30 through the second line L2 .

Further, the evaporative gas compressor 20 may be a centrifugal type compressor. The centrifugal type compressor is capable of being pressurized to about 6 to 10 bar, has no labyrinth ring, is cheap, and has the effect of preventing vibrations during low load motion.

In the embodiment of the present invention, an evaporative gas cooler (not shown) may be provided at each rear end of the evaporative gas compressor 20. If the evaporation gas is pressurized by the evaporation gas compressor 20, the temperature may also rise with the pressure increase. Therefore, in this embodiment, the evaporation gas cooler can be used to lower the temperature of the evaporation gas again. The evaporative gas cooler may be installed in the same number as the evaporative gas compressor 20, and each evaporative gas cooler may be provided downstream of each evaporative gas compressor 20.

Further, in the embodiment of the present invention, when the evaporation gas compressor 20 is provided in parallel and the amount of the evaporation gas generated in the liquefied gas storage tank 10 rapidly increases, When one of the evaporator 20 and the evaporator 20 malfunctions or shut down, the other evaporator gas compressor 20 can be operated to efficiently receive and process the evaporated gas generated in the liquefied gas storage tank 10 .

The recondenser 30 is provided between the evaporative gas compressor 20 and the second pump 40 or between the first pump 11 and the second pump 40 and is connected to the liquefied gas storage tank 10 through the liquefied gas And recycled and supplied to the second pump 40 after the evaporation gas is supplied.

Specifically, the re-condenser 30 pressurizes the evaporated gas of the liquefied gas storage tank 10 to the evaporative gas compressor 20 at a pressure of about 6 to 8 bar to be supplied through the second line L2, The liquefied gas in the tank 10 is pressurized by the first pump 11 at a pressure of about 6 to 8 bar to be supplied through the first line L1 to recondense the evaporated gas through the low temperature liquefied gas, The liquefied gas or the evaporated gas can be supplied to the second pump 40. [

The re-condenser 30 mixes the evaporated gas generated from the liquefied gas storage tank 10 and the liquefied gas stored in the liquefied gas storage tank 10 to transfer the liquefied gas cold heat at a low temperature to re-condense the evaporated gas Can be used.

At this time, the re-condenser 30 supplies the evaporation gas and the liquefied gas through the evaporative gas compressor 20 and the first pump 11 at a pressure of about 6 to 8 bar (or 6 to 15 bar) The recondensation efficiency is improved more than that of the gas or the liquefied gas, the recondensed state is maintained while maintaining the pressure, and the compressed gas is supplied to the second pump 40, thereby reducing the compression load of the second pump 40.

In the embodiment of the present invention, it is not necessary to provide the DFDE to consume the evaporated gas generated in the liquefied gas storage tank 10 by processing the evaporated gas with the recondenser 30, Since the evaporation gas is additionally supplied and recycled and used as fuel, it is not necessary to have a forced vaporizer used when the fuel is in shortage, and the system construction cost is reduced, and the system configuration is simplified, There is an increasing effect.

The second pump 40 may be a high-pressure pump which is supplied with the recondensed liquefied gas from the recondenser 30, can be secondarily pressurized, pressurized to a high pressure, and pressurized to about 200 to 400 bar. Specifically, the second pump 40 may be provided between the recondenser 30 and the vaporizer 50 on the third line L3 and may be provided with a pressure of about 6 to 8 bar from the recondenser 30 The liquefied gas is recycled to the vaporizer 50 and pressurized to a high pressure of about 200 to 400 bar.

The second pump 40 is pressurized to a high pressure of about 200 to 400 bar and supplied to the first consumer 60 via the vaporizer 50 to supply the pressure demanded by the first consumer 60 to the first consumer 60 So that the first customer 60 can produce the thrust through the liquefied gas.

The second pump 40 pressurizes the liquid recycle liquefied gas or the evaporated gas discharged from the recondenser 30 to a high pressure so that the liquefied gas or the evaporated gas has a temperature and a pressure higher than the critical point Phase state to have a supercritical state. At this time, the temperature of the liquefied gas in the supercritical state may be minus 20 degrees or less, which is relatively higher than the critical temperature.

Or the second pump 40 can pressurize the liquefied gas in the liquid state to a supercooled liquid state under high pressure. Here, the liquefied gas in the subcooled liquid state is a state in which the pressure of the liquefied gas is higher than the critical pressure and the temperature is lower than the critical temperature.

Specifically, the second pump 40 pressurizes the liquid-state liquefied gas discharged from the recondenser 30 to a high pressure of 200 to 400 bar so that the temperature of the liquefied gas becomes lower than the critical temperature, Can be phase-changed into a supercooled liquid state. Here, the temperature of the liquefied gas in the subcooled liquid state may be minus 140 degrees to minus 60 degrees lower than the critical temperature.

In the embodiment of the present invention, when the second pump 40 is provided in parallel and one of the second pumps 40 malfunctions or shut down, the other one of the second pumps 40 And it is possible to reliably or stably supply the evaporated gas or the liquefied gas recycled to the recondenser 30 to the first customer 60 because it can operate.

The vaporizer 50 is capable of vaporizing high pressure liquefied gas which is provided on the third line L3 and discharged from the second pump 40. [ More specifically, the vaporizer 50 is provided on the third line L3 between the first customer 60 and the second pump 40 to vaporize the high-pressure liquefied gas supplied from the second pump 40, 1 Demand source 60 can supply the desired state.

At this time, the vaporizer 50 can use Glycol Water, Sea Water, Steam, or engine exhaust gas as the fuel for vaporizing the liquefied gas, and the pressure of the liquefied gas at a high pressure It can be supplied to the first customer 60 without any change.

The first consumer 60 uses the liquefied gas or the evaporated gas supplied from the liquefied gas storage tank 10 as the fuel. That is, the first customer 60 needs a liquefied gas or a vaporized gas and can be driven using the raw material as the raw material. The first consumer 60 may be, but is not limited to, an engine (e.g., a MEGI engine as a high pressure gas injection engine)

The first customer 60 may be connected to the liquefied gas storage tank 10 through the first line L1 and the second line L2 through the third line L3 and may be connected to the high pressure The liquefied gas or the evaporated gas can be supplied.

The first consumer 60 can use vaporized or liquefied gas that has been pressurized to about 200 to 400 bar and vaporized by the second pump 40 and the vaporizer 50 and uses a high pressure vaporized gas of about 300 bar Pressure engine, and may be an engine for directly rotating the propeller shaft 71 to drive the propeller 70 or an engine for generating other power.

As the piston (not shown) inside the cylinder (not shown) reciprocates by the combustion of the liquefied gas, the engine rotates the crankshaft (not shown) connected to the piston and the shaft Can be rotated. Therefore, as the propeller 70 connected to the propeller shaft 71 rotates when the first customer 60 is driven, the hull can be moved forward or backward.

The first consumer 60 can obtain the driving force by supplying the pressurized vaporized liquefied gas through the second pump 40 and the vaporizer 50. The state of the liquefied gas can be obtained in a state required by the first customer 60 Can vary.

Also, the first customer 60 may be a heterogeneous fuel engine that can use heterogeneous fuel. A heterogeneous fuel engine is typically a two-stroke engine driven by a diesel cycle. In this diesel cycle, air is compressed by the piston, the compressed high-temperature air is ignited by the pilot fuel, and the remaining high-pressure gas is injected to cause the explosion.

In this case, HFO (Heavy Fuel Oil) or MDO (Marine Diesel Oil) is used as the ignition fuel, and the ratio of the ignition fuel to the high-pressure gas is about 5:95, and the injection amount of the ignition fuel can be adjusted from 5 to 100% Do. Therefore, the ignition fuel is also usable as the driving fuel for the engine.

That is, when the injection amount of the ignition fuel is about 5%, evaporative gas (or heated liquefied gas; about 95%) is mainly used as the engine driving fuel, and when the injection amount of the ignition fuel is 100% Fuel (oil) is all used.

At this time, when the injection amount of the ignition fuel is 50% (and about 50% of the evaporation gas), the ignition fuel is ignited first to generate the calorific value instead of being mixed with the evaporative gas or the liquefied gas and flowing into the engine, The remaining evaporation gas flows in and explodes to produce the calorific value, thereby producing the calorific value required for driving the engine.

The second customer 61 uses the evaporated gas supplied from the liquefied gas storage tank 10 as fuel. That is, the second customer 61 needs evaporation gas and can be driven using the same as a raw material. The second consumer 61 may be, but is not limited to, a generator (e.g., DFDG), a gas fired device (GCU), a boiler (e.g.

Specifically, the second customer 61 may be connected to the liquefied gas storage tank 10 through the second line L2 and the fourth line L4, and may be connected to the liquefied gas storage tank 10 by the evaporative gas compressor 20 at about 1 to 6 bar, and can be used as fuel.

In addition, the second customer 61 may be a heterogeneous fuel engine capable of using a heterogeneous fuel, so that not only evaporation gas but also oil can be used as fuel. However, when the evaporation gas and oil are not mixed and supplied, As shown in FIG. This is to prevent the mixture of two substances having different combustion temperatures from being mixed, thereby preventing the efficiency of the second consumer 61 from being lowered.

The control unit 90 can receive the load information from the first customer 60 in a wired or wireless manner and can receive the load information from the first customer 60 via a wired or wireless connection with the evaporation gas discharge valve 112, the evaporation gas separation valve 113, The drive signal can be transmitted wirelessly.

1 and 2, the control unit 90 controls the operation of the evaporation gas discharge valve 112 and the evaporation gas discharge valve 112. In the embodiment of FIG. 1, 1 pump 11, the control unit 90 controls the evaporation gas discharge valve 112, the evaporation gas separation valve 113 and the first pump 11 in the embodiment of FIG.

First, FIG. 1 will be described in order to explain the embodiment of FIG.

When the load of the first customer 60 is high, the control unit 90 sends an opening opening signal to the evaporation gas discharge valve 112 and a pump opening signal to the first pump 11, The re-condenser 30 can supply both the evaporated gas and the liquefied gas from the liquefied gas storage tank 10 by transmitting the driving signal so that the liquefied gas or the evaporated gas recycled in the re- To be supplied to the fuel in the fuel tank (60).

The control unit 90 receives the load signal from the first customer 60 and transmits an opening closing signal to the evaporation gas discharge valve 112 when the load of the first customer 60 is low, The re-condenser 30 can supply only the liquefied gas from the liquefied gas storage tank 10 so that the liquefied gas stored in the re-condenser 30 can be supplied as the fuel of the first consumer 60 And the liquefied gas storage tank 10 can be controlled so that the generated evaporated gas remains in the liquefied gas storage tank 10 to be accumulated. Of course, in this case, the driving of the evaporative gas compressor 20 can be stopped.

That is, in the embodiment of the present invention, when the load of the first customer 60 is high, that is, when the load of the MEGI engine is high, the liquefied gas and the evaporated gas are all supplied from the liquefied gas storage tank 10, 30 to effectively treat the evaporated gas generated in the liquefied gas storage tank 10 and to use the recondensed liquefied gas or evaporated gas as fuel for the MEGI engine. Here, when the load of the first customer 60 is high, for example, the ship may be propelled at high speed (18 knots or more). At this time, the liquefied gas or the evaporated gas supplied to the recondenser 30 has a pressure of about 6 to 8 bar, and the recondensed liquefied gas or the evaporated gas supplied to the first customer 60 is pressurized to a pressure of about 200 to 400 bar Lt; / RTI >

When the load of the first demander 60 is low, that is, when the load of the MEGI engine is low, the recondenser 30 receives the liquefied gas only from the liquefied gas storage tank 10 and supplies the liquefied gas stored in the recondenser 30 And the evaporated gas generated in the liquefied gas storage tank 10 can be accumulated so as to remain in the liquefied gas storage tank 10 as it is. At this time, the recondenser 30 does not perform the recondensation process, and only the liquefied gas is temporarily stored, and the sucking drum before being supplied to the second pump 40, which satisfies the effective suction head condition of the second pump 40 Suction Drum) and is not supplied with evaporative gas from the liquefied gas storage tank 10.

When the load of the MEGI engine is high (for example, when the ship is propelled at a high speed (18 knots or more)), the amount of liquefied gas stored in the liquefied gas storage tank 10 is large (when the ship is propelled at high speed, The amount of evaporated gas generated due to the increase in the amount of stored liquefied gas as the propellant fuel is increased in the early stage or the middle stage. As a result, the internal pressure of the liquefied gas storage tank 10 rises and the durability is weakened or the risk of damage is increased. Therefore, the evaporation gas treatment becomes difficult.

Therefore, in the embodiment of the present invention, it is solved by using the recondenser 30 to consume the evaporation gas as the fuel of the MEGI engine, thereby optimizing the use of the evaporation gas without wasting the processing of the evaporation gas, It is possible to efficiently and resiliently control the internal pressure of the battery.

In the case where the load of the MEGI engine is low (for example, when the ship is propelled at low speed (16Knot or less), or when the ship is ported in & out or anchoring (cargo loading or unloading)), the stored liquefied gas (In the case of propelling a ship at a low speed or in the case of a port in & out or anchoring, the storage amount of the liquefied gas as the propellant fuel is small since it is at the end of navigation) It is not necessary to separately treat the evaporation gas.

Therefore, when the load of the MEGI engine is low, it is possible to optimally use the liquid gas storage tank 10 without accumulation of evaporated gas, without waste of evaporation gas, Can be efficiently and flexibly managed.

Next, FIG. 2 will be described in order to explain the embodiment of FIG.

When the load of the first customer 60 is high, the control unit 90 outputs the opening signal to the evaporation gas discharge valve 112 and the opening signal to the evaporation gas separation valve 113 A pump drive signal is transmitted to the first pump 11 and the recondenser 30 is supplied with the liquefied gas L3 from the second line 11 by sending an opening opening signal on the fourth line L4 side and an opening opening signal on the side of the evaporation gas compressor 20 and on the recondenser 30, Condensed liquefied gas or vaporized gas in the recondenser 30 can be supplied to the fuel of the first customer 60 by allowing both the evaporated gas and the liquefied gas to be supplied from the storage tank 10.

When the load of the first customer 60 is low, the controller 90 receives an opening signal to the evaporator gas discharge valve 112 and an opening signal to the evaporator gas separator valve 113 The evaporation gas compressor 20 side and the fourth line L4 side opening degree opening signal and the recloser 30 side opening degree closing signal are transmitted to the first pump 11 and the pump driving signal is transmitted to the first pump 11, Can be supplied with only liquefied gas from the liquefied gas storage tank 10 and the evaporated gas generated from the liquefied gas storage tank can be supplied to the second customer 61 for processing. In this case, unlike the embodiment of FIG. 1, even when the load of the first consumer 60 is low, the evaporative gas compressor 20 is driven and the compressed evaporative gas is supplied to the second consumer 61.

In the embodiment of FIG. 2, there is a difference between the embodiment of FIG. 1 and the driving method when the load of the first demander 60 is low. This is because when the accumulating method is not allowed in the liquefied gas storage tank 10, It may be the case that it is desired to consume all the evaporated gas generated in the gas storage tank 10.

2, when the load of the first customer 60 is low, the evaporated gas generated in the liquefied gas storage tank 10 flows through the second line L2 into the evaporative gas compressor 20, The refrigerant is supplied to the second consumer 61 through the fourth branched line L4, which is not the re-condenser 30, after being pressurized to 6 to 8 bar. At this time, the evaporated gas generated in the liquefied gas storage tank 10 is converted into the form of electric power and stored in the second demand point 61, The steam is converted and stored in the form of steam, so that the surplus evaporating gas can be efficiently used without waste.

As described above, the liquefied gas processing system 1 according to the present invention can treat the evaporation gas through the recondenser 30 to prevent waste of the liquefied gas and ensure the optimized use, It is possible to reduce the construction cost of the system and enable efficient use of space in the ship.

3 and 4 are conceptual diagrams showing a liquefied gas processing system according to a fourth embodiment of the present invention.

3 and 4, a liquefied gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a first pump 11, an evaporative gas compressor 20, The second pump 40, the vaporizer 50, the first customer 60, the second customer 61, the clutch 72 and the shaft generator 80, the control unit 90, A valve 112, and an evaporation gas isolation valve 113. Here, the ship (not shown) may be, for example, a container ship or a bulk ship, but is not limited thereto.

In this embodiment, the configuration of the clutch 72 and the shaft generator 80 is added, and the control of the controller 90 is changed. The rest of the configuration is the same as or similar to the embodiments of Figs. The same reference numerals are given to the same or corresponding components as those of the above-described embodiment, and a duplicate description thereof will be omitted.

Hereinafter, a liquefied gas processing system 1 according to an embodiment of the present invention will be described with reference to Figs. 3 and 4. Fig.

The clutch 72 may be provided on the propeller shaft 71 to block or connect the power generated by the first customer 60 to the propeller 70. In the embodiment of the present invention, the clutch 72 can be used as a general clutch used in a ship, which is known in the art and omits a detailed description of the construction.

The clutch 72 may be provided between a shaft generator 80 and a propeller 70 which will be described later. When receiving the engagement signal from the control unit 90, which will be described later, It is possible to prevent the power generated in the first customer 60 from being transmitted to the propeller 70 when the signal is transmitted to the propeller 70 and the cancel signal is received from the controller 90.

The propeller 70 whose power transmission is blocked by the clutch 72 can be naturally rotated or stopped by the seawater due to inertia of the ship in the straight forward direction. At this time, all the power generated in the first demander 60 is transmitted to the shaft generator (Not shown).

The shaft generator 80 is coupled with the propeller shaft 71 and is interlocked with the propeller shaft 71. The shaft generator 80 generates power by receiving power from the first customer 60 and supplies the power to an energy storage system To store the power in the form of energy. At this time, the shaft generator 80 gives resistance to the driving of the first customer 60 (here, the first customer 60 is the MEGI engine). With this resistance, the ship is connected to the first customer 60, The liquefied gas or the evaporation gas can be consumed without increasing the speed.

The shaft generator 80 is connected to an energy storage facility by a power supply line (not shown) to supply power generated by the shaft generator 80, and a converter (not shown) Is installed to convert the electric power generated in the shaft generator 80 into electric power required by the energy storage facility.

The control unit 90 can receive the propulsion information of the ship from the outside by wire or wirelessly and can receive the propulsion information of the ship from the outside through the clutch 71, the shaft generator 80, the evaporation gas discharge valve 112, the evaporation gas separation valve 113, The pump 11 can transmit the drive signal in a wired or wireless manner.

3 and 4, the control unit 90 includes a clutch 71, a shaft generator 80, and a control unit 80. The control unit 90 controls the clutches 71, The control unit 90 controls the shaft generator 80, the evaporation gas discharge valve 112, the evaporation gas separation valve 113 (first evaporation gas discharge valve 112), the evaporation gas discharge valve 112 and the first pump 11 And the first pump 11 are controlled.

First, FIG. 3 will be described in order to explain the embodiment of FIG.

The control unit 90 transmits an opening opening signal to the evaporation gas discharge valve 112 and a pump driving signal to the first pump 11 regardless of whether or not the propulsion information of the ship has been received so that the recondenser 30, Condensed liquefied gas or vaporized gas in the recondenser 30 can be supplied to the fuel of the first customer 60 by allowing both the evaporated gas and the liquefied gas to be supplied from the first condenser 10, The customer 60 and the shaft generator 80 can transmit drive signals regardless of whether the ship is receiving propulsion information to control the first consumer 60 and the shaft generator 80 to be continuously driven.

That is, under the control of the control unit 90, the recondenser 30 is supplied with the evaporated gas supplied from the liquefied gas storage tank 10 through the evaporative gas compressor 20 at a pressure of about 6 to 8 bar, The liquefied gas stored in the storage tank 10 is pressurized to about 6 to 8 bar through the first pump 11 to mix the liquefied gas with the evaporated gas to recondense the evaporated gas, The gas can be pressurized to about 200 to 400 bar through the second pump 40 and vaporized by the vaporizer 50 to be supplied as the fuel of the first customer 60. At this time, the first demander 60 continuously receives the fuel, and the power is continuously generated, and the generated power can be continuously supplied to the shaft generator 80 to continuously generate electric power.

The control unit 90 receives the propulsion information of the ship from the outside and transmits a signal to the clutch 72 to transmit the power generated in the first customer 60 to the propeller 70 to transmit the power generated by the first customer 60 to the propeller 70 by transmitting a release signal to the clutch 72 when the propulsion signal of the ship is not received So that the ship can be controlled so as not to be propelled.

That is, when the control unit 90 receives the propulsion signal of the ship, the propeller 70 and the first demander 60 are connected through the clutch 72 to transmit the power generated in the first demander 60 to the ship The propeller 70 and the first consumer 60 are disconnected from each other through the clutch 72 when the propeller 70 is used for propelling and generating electric power through the shaft generator 80 and does not receive the propulsion signal of the ship All the power generated in the first customer 60 can be used to generate electric power through the shaft generator 80. [

In this case, when the propulsion signal of the ship is received, it is preferable that the ship is propelled at about 18 knots or more, and when the propulsion signal of the ship is not received, it may be anchoring (cargo loading or unloading).

As described above, in the embodiment of the present invention, the shaft generator 80 can be always driven irrespective of the propulsion of the ship, thereby improving the reliability of power supply and enabling efficient production of electric power. It is possible to efficiently and economically use the evaporated gas by converting it into electric power instead of discharging it or burning it and reproducing it with other energy.

Next, a description will be made of FIG. 4 in order to explain the embodiment of FIG. 4 of the present invention.

The control unit 90 transmits an opening opening signal to the evaporation gas discharge valve 112 regardless of whether or not the propulsion information of the ship is received so that the evaporation gas compressor 30 compresses the evaporation gas generated in the liquefied gas storage tank 10 .

When the driving signal of the ship is received from the outside, the control unit 90 outputs a pump driving signal to the first pump 11, a fourth line L4 (L4) to the evaporation gas separation valve 113, ) Side opening opening closing signal and the opening signal to the evaporation gas compressor 20 side and the recondensing device 30 side, the first customer 60 and the shaft generator 80, the recondenser 30 is liquefied The liquefied gas or the evaporated gas recycled in the recondenser 30 is supplied to the first consumer 60 as the fuel of the first consumer 60 by supplying both the evaporated gas and the liquefied gas from the gas storage tank 10, So that power can be generated and power can be generated through the generated shaft-generator 80 to control the ship to be propelled.

When the propulsion signal of the ship is not received from the outside and the propulsion signal of the ship is not received, the control unit 90 outputs a pump driving stop signal to the first pump 11 and an evaporation gas compressor 20 and the fourth line L4 and the opening closing signal on the recycler 30 and the driving stop signal to the first customer 60 and the shaft generator 80 and the driving stop signal to the second customer 61 The supply of the fuel to the first customer 60 is stopped to stop the operation of the first customer 60 and the supply of the evaporated gas generated in the liquefied gas storage tank 10 to the second customer 61 So that power or steam can be generated at the second demand point 61 (DFDG). At this time, the DFDE of the second customer 61 produces electricity through the evaporation gas, and the boiler can produce steam through the evaporation gas.

Here, when the ship's propulsion signal is received, it is preferable that the ship propels at about 18 knots or more, and when it does not receive the propulsion signal of the ship, it may be anchoring (cargo loading or unloading).

As described above, in the embodiment of the present invention, when the ship is propelled, the shaft generator 80 is driven to generate electric power, and when the ship is not propelled, the DFDG is driven to generate electric power, There is an effect that the reliability of the supply is improved and the efficiency and economical use of the evaporation gas can be enabled by converting the evaporation gas into electric power or steam instead of discharging it to the outside or burning it and reproducing it with other energy.

As described above, the liquefied gas processing system 1 according to the present invention can treat the evaporation gas through the recondenser 30 to prevent waste of the liquefied gas and ensure an optimized use, The necessary construction can be reduced, and the system construction cost can be reduced and the space inside the ship can be used efficiently.

In addition, regardless of whether or not the ship is propelled, the shaft generator 80 is always driven even when the ship is not driven through the clutch 72, or when the ship is not propelled through the DFDG, So that it is possible to convert the processing of the surplus evaporative gas into electric power, thereby making it possible to economically use the evaporative gas.

5 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.

5, a liquefied gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a first pump 11, a first heat exchanger 12, A preheater 21, a first customer 60, and a controller 90. The preheater 21, In the embodiment of the present invention, the vessel (not shown) may be a gas turbine propulsion LNG carrier or a container ship. In the case where the ship is a container ship, the liquefied gas storage tank 10 may be a B type tank, It is not limited.

Hereinafter, a liquefied gas processing system 1 according to an embodiment of the present invention will be described with reference to Fig.

In the embodiment of the present invention, it may further include first and second lines L1 to L2. Valves (not shown) capable of adjusting the opening degree may be provided in each line, and the supply amount of the evaporation gas may be controlled according to the opening degree of each valve.

The first line L1 is connected to the liquefied gas storage tank 10 and the downstream end of the evaporative gas compressor 20 on the second line L2 and has a first pump 11 and a first heat exchanger 12 And the liquefied gas of the liquefied gas storage tank 10 can be supplied to the second line L2 through the first pump 11. [

The second line L2 connects the liquefied gas storage tank 10 and the first consumer 60 and may include an evaporative gas compressor 20, a preheater 21 and a first pressure sensor 901 , And the evaporated gas of the liquefied gas storage tank 10 may be supplied to the first consumer 60 through the evaporative gas compressor 20.

The liquefied gas storage tank 10 is the same as or similar to the liquefied gas storage tank 10 in the embodiment of Figs.

The first pump (11) can pressurize the liquefied gas stored in the liquefied gas storage tank (10) and supply it to the first heat exchanger (12). Specifically, the first pump 11 is provided between the liquefied gas storage tank 10 and the first heat exchanger 12 on the first line L1 to store liquefied gas stored in the liquefied gas storage tank 10 Can be supplied to the first heat exchanger (12).

The first pump 11 can supply the liquefied gas stored in the liquefied gas storage tank 10 to the first heat exchanger 12 by pressurizing the liquefied gas to about several to several tens of bar (preferably about 30 to 50 bar). Here, the first pump 11 can pressurize the liquefied gas discharged from the liquefied gas storage tank 10 to slightly increase the pressure and the temperature, and the liquefied gas pressurized by the first pump 11 is still in the liquid state Lt; / RTI >

The first pump 11 may be provided inside the liquefied gas storage tank 10 or may be provided at a position lower than the level of the liquefied gas stored in the liquefied gas storage tank 10, have.

Further, the first pump 11 can change the pressure or the flow rate discharged according to the supply of electric power to the variable displacement pump. For example, the first pump 11 increases the pressure or the flow rate of the liquefied gas discharged in proportion to the amount of power increased when the supplied power increases, and decreases in proportion to the amount of power decreased as the supplied power becomes smaller The pressure or the flow rate of the discharged liquefied gas is reduced.

The amount of electric power supplied to the first pump 11 by the control unit 90 can be adjusted by connecting the first pump 11 to the control unit 90, which will be described later, either by wire or wirelessly. A detailed description of the first pump 11 being controlled through the control unit 90 will be described later.

The first heat exchanger 12 can be supplied with the liquefied gas pressurized by the first pump 11 at 30 to 50 bar (preferably about 40 bar) and can be heated. Specifically, the first heat exchanger 12 is provided downstream of the first pump 11 on the first line L1 and receives the pressurized liquefied gas supplied from the first pump 11, And then supplied to the first customer 60 to supply the liquefied gas in a state required by the first customer 60. [

That is, the first heat exchanger 12 receives the liquefied gas from the first pump 11 at a pressure of about 30 to 50 bar (preferably about 40 bar) and a temperature of about 163 to about 160, It may be heated to 40 to 50 degrees (preferably about 45 degrees) and then supplied to the first consumer 60. [ The first heat exchanger 12 may use glycol water, steam, or sea water as a heat source for heating the liquefied gas. Alternatively, the first heat exchanger 12 may pressurize the liquefied gas without changing the first And can be supplied to the customer 60.

The evaporative gas compressor (20) pressurizes the evaporative gas generated in the liquefied gas storage tank (10). Specifically, the evaporative gas compressor 20 is disposed downstream of the preheater 21 on the second line L2 to supply the evaporated gas generated and discharged from the liquefied gas storage tank 10 at a pressure of about 30 to 50 bar To the first demander 60. [0050]

A plurality of evaporation gas compressors 20 may be provided to press the evaporation gas at multiple stages. For example, three evaporation gas compressors 20 may be provided to pressurize the evaporation gas at three stages. The example three-stage compressor is only one example and is not limited to the three stages.

At this time, the evaporative gas compressor 20 can pressurize the evaporative gas at a pressure of about 1 bar to 2 bar to about 30 to 50 bar, and can be supplied to the first consumer 60 through the second line L2. Also, the evaporative gas compressor 20 may be a reciprocating type compressor. The reciprocating compressor can pressurize to about 30 to 50 bar and can pressurize according to the pressure demanded by the first customer 60.

The evaporation gas compressor 20 may be an ordinary temperature compressor and is supplied with an evaporation gas having a temperature of about 20 to 10 degrees Celsius (preferably, minus 15 degrees Celsius) And can be heated to about 30 to 50 degrees (preferably about 45 degrees).

That is, the evaporative gas compressor 20 is operated at a pressure of from about 1 bar to 2 bar (preferably 1.03 bar) and a temperature of about -20 to 10 degrees (preferably -15 degrees) 50 bar (preferably 40 bar) and a temperature image of 30 to 50 degrees (preferably 45 degrees image) to the first consumer 60.

In the embodiment of the present invention, the liquefied gas which is joined to the first line (L1) at the downstream of the evaporative gas compressor (20) and pressurized by the first pump (11) and heated through the first heat exchanger (12) And the evaporated gas pressurized by the evaporative gas compressor (20) may be mixed and supplied to the first customer (60). Here, when the evaporation gas and the liquefied gas are merged downstream of the evaporative gas compressor 20, the pressure is 30 to 50 bar (preferably 40 bar) and the temperature may be about 30 to 50 degrees (preferably 45 degrees) .

Further, in the embodiment of the present invention, an evaporative gas cooler (not shown) may be provided at each rear end of the evaporative gas compressor 20. If the evaporation gas is pressurized by the evaporation gas compressor 20, the temperature may also rise with the pressure increase. Therefore, in this embodiment, the evaporation gas cooler can be used to lower the temperature of the evaporation gas again. The evaporative gas cooler may be installed in the same number as the evaporative gas compressor 20, and each evaporative gas cooler may be provided downstream of each evaporative gas compressor 20.

The preheater 21 can heat the evaporation gas generated in the liquefied gas storage tank 10 to the evaporation gas compressor 20 so that the evaporation gas compressor 20 can use the room temperature evaporation gas. Specifically, the preheater 21 is configured to preheat the cryogenic (about minus 90 degrees) evaporation gas generated in the liquefied gas storage tank 10 by using steam, sea water, It may be heated to 20 deg. To 10 deg. (Preferably minus 15 deg.).

At this time, the evaporated gas generated in the liquefied gas storage tank 10 has a pressure of about 1.06 bar, but the pressure can be reduced to about 1.03 bar while passing through the preheater 21.

The first consumer 60 uses the liquefied gas or the evaporated gas supplied from the liquefied gas storage tank 10 as the fuel. That is, the first customer 60 needs a liquefied gas or a vaporized gas and can be driven using the raw material as the raw material. The first consumer 60 may be, but is not limited to, a turbine (e.g., a gas turbine)

Here, the first customer 60 may be connected to the liquefied gas storage tank 10 through the first line L1 and the second line L2, and may be pressurized at a pressure of about 30 to 50 bar (preferably 40 bar) The liquefied gas or the evaporated gas may be supplied.

The turbine may be, but is not limited to, a gas turbine, a steam turbine, and a steam turbine using waste heat. Turbines can be used to generate power and can be used to power the hull by connecting directly to a drive shaft that propels the propeller.

The first customer 21 may be an engine using an evaporated gas pressurized to about 30 to 50 bar, an engine for driving the propeller, or a turbine. The turbine may be a gas turbine, a steam turbine, and a steam turbine using waste heat, and may be, but is not limited to, a gas turbine. The turbine may be used to produce power and indirectly drives the propeller shaft 71 through the generated power to rotate the propeller 70 or directly to the propeller shaft 71 to rotate the propeller 70, Lt; / RTI >

The first customer 60 can receive the driving force by supplying the evaporated gas pressurized through the evaporative gas compressor 20 or the liquefied gas pressurized by the first pump 11 and the first vaporizer 12, The evaporation gas or liquefied gas may vary depending on the state required by the first customer 60.

The control unit 90 further includes a first pressure sensor 901 and is connected to the first pressure sensor 901 and the first pump 11 either in a wired or wireless manner, And the first pump 11 can be controlled accordingly.

The first pressure sensor 901 is provided between the first consumer 60 on the second line L2 and the evaporative gas compressor 20 and more specifically the first pressure sensor 901 is provided between the first consumer 60 and the first line L1 To measure the pressure of the fuel supplied to the first customer 60 and transmit the measured pressure to the control unit 90 by wire or wirelessly.

The control unit 90 can receive the front end pressure of the first consumer 60 on the second line L2 from the first pressure sensor 901. When the front end pressure of the first consumer 60 reaches the first consumer 60 (Preferably about 40 bar), the power supplied to the first pump 11 is reduced to reduce the load of the first pump 11 to reduce the flow rate of the liquefied gas discharged from the first pump 11 The power supplied to the first pump 11 is increased to increase the power supplied to the first pump 11 when the front end pressure of the first consumer 60 is lower than the pressure required by the first consumer 60 (preferably about 40 bar) The flow rate of the liquefied gas discharged can be increased.

At this time, in the embodiment of the present invention, the evaporated gas generated in the liquefied gas storage tank 10 is pressurized by the evaporative gas compressor 20 to be supplied to the first consumer 60.

That is, in the embodiment of the present invention, all the evaporation gas generated in the liquefied gas storage tank 10 is pressurized by the evaporative gas compressor 20 to be supplied to the first consumer 60, The liquefied gas stored in the liquefied gas storage tank 10 is pressurized and supplied to the first customer 60 to maintain the front end pressure of the first customer 60 at about 40 bar.

However, when the amount of evaporative gas generated in the liquefied gas storage tank 10 is reduced and the amount of the evaporative gas supplied to the first consumer 60 by the evaporative gas compressor 20 is reduced, the first pressure sensor 901 The front end pressure of the first consumer 60 measured by the first consumer 60 becomes smaller than about 40 bar, thereby reducing the driving efficiency of the first consumer 60 and possibly stopping the operation if it is serious.

Therefore, in the embodiment of the present invention, when the first control unit 90 receives the pressure of the first consumer 60 through the first pressure sensor 901 and the pressure of the first consumer 60 reaches about 40 bar The power supplied to the first pump 11 is increased to increase the load of the liquefied gas so that the load of the first pump 11 is increased so that the pressure at the front end of the first consumer 60 is increased to 40 bar So that flexibility of fuel supply to the first customer 60 is increased and driving reliability is improved.

Contrary to the above case, when the amount of evaporative gas generated in the liquefied gas storage tank 10 is increased and the amount of the evaporative gas supplied to the first consumer 60 by the evaporative gas compressor 20 increases, 1 pressure measured by the pressure sensor 901 is greater than about 40 bar, thereby overpressure is applied to the first customer 60, and the driving efficiency can be reduced.

In the embodiment of the present invention, when the control unit 90 receives the front end pressure of the first consumer 60 through the first pressure sensor 901 and the front end pressure of the first consumer 60 is higher than about 40 bar, The power supplied to the first pump 11 is reduced so that the load of the first pump 11 is lowered and the flow rate of the liquefied gas discharged is reduced so that the pressure at the front end of the first customer 60 can be maintained at 40 bar The flexibility of fuel supply to the first customer 60 is increased and the driving reliability is improved.

As described above, the liquefied-gas processing system 1 according to the present invention realizes the parallel processing of the liquefied gas and the evaporated gas, thereby increasing the flexibility of the drive. The first pump 11 is configured as a variable- So that the pump driving power consumption is minimized and the first pump 11 is pressurized to about 40 bar at a time, so that there is no need to additionally provide an additional boosting pump and a suction drum, And the entire amount of the evaporation gas generated in the liquefied gas storage tank 10 is pressurized by the evaporative gas compressor 20 and supplied to the first consumer 60. Based on this, the controller 90 controls the first pressure sensor 901 The supply of the first pump 11 to the first consumer 60 is controlled depending on the pressure measured by the first pump 11, thereby increasing the driving flexibility of the system.

The liquefied gas processing system 1 according to the present invention includes a first pump 11 for supplying a liquefied gas pressurized and heated by the first pump 11 and a first heat exchanger 12, (L1) is connected to reduce the compression size of the evaporative gas compressor (20), thereby reducing the load of the evaporative gas compressor (20) and reducing the consumed electric power.

6 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.

6, a liquefied gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a first pump 11, a first heat exchanger 12, A preheater 21, a first demander 60, a third demander 62, and a controller 90. Here, the vessel (not shown) may be, for example, a gas turbine propulsion LNG carrier or a container ship. If the vessel is a container ship, the liquefied gas storage tank 10 may be a B type tank, but is not limited thereto.

In this embodiment, there is a further configuration of the third customer 62 and a change of the controller 90, and the rest of the configuration is the same as or similar to the embodiment of FIG. The same or corresponding elements as those of the embodiment of FIG. 5 described above are denoted by the same reference numerals, and redundant description thereof will be omitted.

Hereinafter, a liquefied gas processing system 1 according to an embodiment of the present invention will be described with reference to Fig.

In the embodiment of the present invention, it may further include a fourth line L4. The fourth line L4 connects the liquefied gas storage tank 10 and the third demand point 62 to be described later and supplies the evaporated gas generated in the liquefied gas storage tank 10 to the third demand point 62 have.

At this time, the fourth line L4 may further include an evaporation gas control valve 621 capable of controlling the opening thereof, and may be installed on the fourth line L4. The evaporation gas control valve 621 may include a first control unit The supply amount of the evaporative gas supplied to the third customer 62 can be controlled by adjusting the opening degree through the control of the controller 90.

The third customer 62 can supply the evaporative gas generated from the liquefied gas storage tank 10 through the first control unit 90 and adjust the opening of the evaporative gas control valve 621 to consume the evaporated gas (Not shown), a boiler (not shown), and a steam generator (not shown).

The controller 90 receives the required evaporation gas amount from the first customer 60 and the required power amount of the ship from the outside and can control the supply of the liquefied gas or the evaporated gas according to the required power amount of the ship. ), A second control unit 92, and a third control unit 93.

The first control unit 91 calculates the evaporated gas required amount (hereinafter referred to as the first demanded amount of necessary gas) of the first demanded customer 60 for generating the power used by the first demanded customer 60, The supply amount of the liquefied gas and the evaporation gas is selected through the second control unit 92 and the third control unit 93 by comparing the demanded gas amount with the demanded amount of gas of the liquefied gas storage tank 10.

The second control unit 92 controls the supply of the liquefied gas and controls the liquefied gas so that the front end pressure of the first customer 60 is maintained at about 40 bar.

The third control unit 93 controls the supply of the evaporation gas and controls the internal pressure of the liquefied gas storage tank 10 to be constant.

Hereinafter, the first to third control units 91 to 93 will be described in detail.

The first control unit 91 can calculate the evaporated gas required amount (hereinafter referred to as " first demand source gas amount ") for generating the electric power used in the ship by the first demander 60, It is possible to control the second control unit 92 or the third control unit 93 to operate by comparing the amount of evaporation gas generated in the storage tank 10.

The first control unit 91 may be connected to the second control unit 92, the third control unit 93, the second pressure sensor 902 and the first customer 60 in a wired or wireless manner.

The first control unit 91 can receive the internal pressure value of the liquefied gas storage tank 10 through the second pressure sensor 902 and calculate the amount of evaporative gas generated in the liquefied gas storage tank 10, The amount of gas necessary for the first customer can be calculated through a separate calculation table provided in the control unit 91. [

Here, in the calculation table, if a value calculated through a predetermined user value or a power estimated consumption amount of other power mechanisms is input to the input value, the corresponding result value, that is, Is described.

Hereinafter, the operation mechanism of the first control unit 91 will be described.

The first control unit 91 commands the first customer 60 to start operating based on the first demanded amount of gas required by the first customer,

Then, when the amount of evaporated gas generated in the liquefied gas storage tank 10 is compared with the amount of gas required for the first customer, if the amount of gas required for the first customer is larger than the amount of evaporated gas generated in the liquefied gas storage tank 10, The first control unit 92 and the third control unit 93 respectively transmit the first command to the second control unit 92 and the third control unit 93. When the first demand source gas amount is less than the evaporation gas generation amount of the liquefied gas storage tank 10, (93).

The first command is a command to supply both the liquefied gas and the evaporated gas to the first customer 60. The second command is to stop supplying the liquefied gas to the first customer 60 and supply only the evaporated gas, And the surplus evaporated gas is supplied to the third customer 62.

The second pressure sensor 902 is provided at one side of the inside or outside of the liquefied gas storage tank 10 and is connected to the liquefied gas storage tank 10 which is raised by the evaporation gas generated in the liquefied gas storage tank 10 The internal pressure can be measured and transmitted to the first control unit 91 or the third control unit 93 by wire or wirelessly.

In the embodiment of the present invention, the required power amount of the ship is compared with the evaporated gas amount in the liquefied gas storage tank 10 through the first control unit 91, and the required power of the ship is continuously produced by parallel driving, The internal pressure of the storage tank 10 can be appropriately adjusted and the first consumer 60 can be smoothly driven.

The second control unit 92 further includes a first pressure sensor 901 and may be connected to the first pressure sensor 901, the first pump 11 and the first control unit 91 in a wired or wireless manner.

The second control unit 92 receives the pressure value from the first pressure sensor 901 and when the amount of the first demanded gas required by the user is larger than the evaporation gas generation amount of the liquefied gas storage tank 10, When the amount of evaporation gas required by the first customer 60 is less than the amount of evaporation gas generated by the liquefied gas storage tank 10, the first pump 11 is driven from the first control unit 91, 2 command to stop the operation of the first pump 11.

The first pressure sensor 901 is provided between the first customer 60 on the second line L2 and the evaporative gas compressor 20 and more specifically includes the first customer 60 and the first line L1 of the first demand point 60 are merged to measure the pressure of the fuel supplied to the first demand point 60 and transmit the measurement result to the second control section 92 by wire or wirelessly.

Hereinafter, the mechanism of the second control unit 92 will be described.

First, a mechanism when the second control unit 92 receives the first command from the first control unit 91 will be described.

 The second controller 92 receives the first command from the first controller 91 and calculates the amount of evaporation gas generated in the liquefied gas storage tank 10 by the first pump 11 It is possible to supply the fuel to the first customer 60 so that the fuel supply to the first customer 60 can be performed smoothly.

The second control unit 92 receives the pressure of the first consumer 60 on the second line L2 from the first pressure sensor 901 and determines that the front end pressure of the first consumer 60 is higher than the pressure of the first consumer 60, (Preferably about 40 bar), the power supplied to the first pump 11 is reduced to reduce the load of the first pump 11 to reduce the flow rate of the discharged liquefied gas The power supplied to the first pump 11 may be increased to increase the power supplied to the first pump 11 when the pressure of the first consumer 60 is lower than the pressure required by the first consumer 60 (preferably about 40 bar) 11 can be increased and the flow rate of the liquefied gas discharged can be increased.

At this time, all of the evaporation gas generated in the liquefied gas storage tank 10 is pressurized by the evaporative gas compressor 20 and supplied to the first consumer 60. This is controlled by the third control unit 92, which will be described later.

In the above description, when the pressure at the front end of the first consumer 60 is higher than the pressure required by the first consumer 60 (preferably about 40 bar), the pressure of the evaporation gas generated in the liquefied gas storage tank 10 Is a fluctuation state in which the amount of supply of the first pump 11 is temporarily increased so that the amount of gas is larger than the amount of gas necessary for the first customer (not steady state).

Next, the mechanism when the second control unit 92 receives the second command from the first control unit 91 will be described.

The second control unit 92 may cause the first pump 11 to stop driving after receiving the second command from the first control unit 91 so that the supply of the liquefied gas to the first customer 60 may be stopped .

At this time, only the evaporated gas is supplied to the first customer 60, which is controlled by the third controller 92, which will be described later.

The third control unit 93 receives the first command from the first control unit 91 in a wired or wireless manner when the amount of gas required for the first customer is larger than the amount of vaporized gas in the liquefied gas storage tank 10, And receives a second command from the first control unit 91 in a wired or wireless manner when the amount of gas required for the first customer is less than the amount of vaporized gas in the liquefied gas storage tank 10, ) Or the evaporation gas control valve 621 can be driven.

The third control unit 93 is connected to the second pressure sensor 902, the first control unit 91, the evaporation gas compressor 20 and the evaporation gas control valve 621 either in a wired or wireless manner, 902 and receives a command from the first control unit 91 and transmits a drive command to the evaporative gas compressor 20 and the evaporative gas control valve 621. [

Hereinafter, the mechanism of the third control unit 93 will be described.

First, the mechanism when the third control unit 93 receives the first command from the first control unit 91 will be described.

The third control unit 93 receives the first command from the first control unit 91 when the amount of gas required for the first demanding customer is larger than the evaporation gas generation amount of the liquefied gas storage tank 10 and outputs the first command to the evaporation gas compressor 20 So that all of the evaporated gas generated in the liquefied gas storage tank 10 is supplied to the first consumer 60. In this case, since the flow rate of the first customer 60 is controlled by the second control unit 92, the flow rate of the front end of the first customer 60 is not taken care of.

Next, a mechanism when the third control unit 93 receives the second command from the first control unit 91 will be described.

The third control unit 93 receives the second command from the first control unit 91 when the amount of gas required for the first demanding customer is less than the evaporation gas generation amount of the liquefied gas storage tank 10 and outputs the second command to the evaporation gas compressor 20 So that the evaporated gas generated in the liquefied gas storage tank 10 is supplied to the first demander 60 only as much as the amount of gas necessary for the first demander and the evaporated gas generated in the liquefied gas storage tank 10 is supplied to the first demander It is possible to efficiently control the internal pressure of the liquefied gas storage tank 10 by opening the evaporation gas control valve 621 so as to supply the amount of the gas to the third customer 62. [

That is, in the embodiment of the present invention, the amount of gas required for the first demanding customer is compared with the amount of evaporation gas in the liquefied gas storage tank 10 through the control unit 90 so that the liquefied gas and the evaporated gas are supplied in parallel, The internal pressure of the liquefied gas storage tank 10 is appropriately adjusted and the front end pressure of the first consumer 60 is maintained at about 40 bar to smoothly drive the first consumer 60 There is an effect to be achieved.

That is, as described above, the liquefied gas processing system 1 according to the present invention realizes the parallel processing of the liquefied gas and the evaporated gas, thereby increasing the flexibility of driving, It is possible to effectively manage the internal pressure of the liquefied gas storage tank 10 by processing the gas and the evaporation gas.

7 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention.

7, the liquefied gas processing system 1 according to the embodiment of the present invention includes a liquefied gas storage tank 10, a first pump 11, a second heat exchanger 13, an intake device 22, a first consumer 60, a third consumer 62, and a controller 90. Here, the vessel (not shown) may be, for example, a gas turbine propulsion LNG carrier or a container ship. If the vessel is a container ship, the liquefied gas storage tank 10 may be a B type tank, but is not limited thereto.

Hereinafter, a liquefied gas processing system 1 according to an embodiment of the present invention will be described with reference to Fig.

In the embodiment of the present invention, it may further include a fifth line L5. The fifth line L5 is branched from the first pump 11 and the intake apparatus 22 on the first line L1 and is branched to the intake apparatus 22 on the second line L2 and the second heat exchanger 13 And can supply the liquefied gas supplied by the first pump 11 to the second heat exchanger 13 by bypassing the liquefied gas.

At this time, the fifth line L5 is further provided with a bypass valve 111 having a three-way valve shape capable of opening degree adjustment, and is installed at a point where the fifth line L5 and the first line L1 are branched And the amount of the liquefied gas supplied to the second heat exchanger 13 can be controlled by regulating the degree of opening of the bypass valve 111 through the control of the first controller 90, which will be described later.

The liquefied gas storage tank 10 is the same as or similar to that described in the embodiment of Fig. 1 of the present invention, so that the first pump 11 and the first customer 60 are arranged in the embodiment of Fig. 5 And the third customer 62 and the evaporation gas control valve 621 are the same as or similar to those described in the embodiment of FIG. 6 of the present invention.

The second heat exchanger 13 is supplied with the liquefied gas pressurized by the first pump 11 at a pressure of 30 to 50 bar (preferably about 40 bar) The pressure of the pressurized gas can be supplied and heated.

Specifically, the second heat exchanger 13 is provided between the intake device 22 on the second line L2 and the first consumer 60, and is connected to the first line L1 and the second line L2 The evaporation gas supplied from the intake device 22 or the pressurized liquefied gas supplied from the first pump 11 through the fifth line L5 is supplied to the evaporator 40 through the fourth line L5, And then supplies the liquefied gas to the first customer 60 to supply the liquefied gas in a state required by the first customer 60. [

That is, the second heat exchanger 13 is supplied with the liquid from the first pump 11 or the intake device 22 at a pressure of about 30 to 50 bar (preferably about 40 bar), a temperature of about 163 to about 160, The gas can be supplied to the first consumer 60 after heating to about 40 to 50 degrees (preferably about 45 degrees). The second heat exchanger 13 may use glycol water, steam or sea water as a heat source for heating the liquefied gas, And can be supplied to the customer 60.

The intake apparatus 22 is a system in which the liquefied gas supplied from the first pump 11 is used as a driving fluid and the liquefied gas is supplied from the first pump 11 to the liquefied gas storage tank 10 And may be supplied to the second heat exchanger 13 after sucking the evaporation gas, or may be an ejector, an electric actuator, or a jet pump.

Specifically, the intake apparatus 22 is provided between the liquefied gas storage tank 10 and the second heat exchanger 13 on the second line L2 and is connected to the first line L1, L1 to supply the liquefied gas stored in the liquefied gas storage tank 10 to the second heat exchanger 13 by sucking the evaporated gas generated in the liquefied gas storage tank 10 through the second line L2 .

Here, the intake device 22 supplies the calculated amount of the driving fluid to the first line L1 through the first pump 11 so as to suck all the amount of evaporated gas generated in the liquefied gas storage tank 10 Can receive. The control unit 90 will be described in detail.

The intake device 22 receives the liquefied gas as a driving fluid and sucks the evaporated gas generated in the liquefied gas storage tank 10 to mix the liquefied gas as the driving fluid with the evaporated gas. At this time, the kinetic energy The kinetic energy of the mixed fluid is returned to the pressure as the velocity of the mixed fluid decreases at the end portion where the cross section of the nozzle (not shown) of the intake device 22 is enlarged . As a result, the evaporated gas generated in the liquefied gas storage tank 10 has a pressure of about 30 to 50 bar (preferably about 40 bar).

In the present invention, the pressure at which the first pump 11 is also pressurized is also about 30 to 50 bar (preferably about 40 bar) or the driving fluid introduced into the intake device 22 is relatively low in pressure and falls in pressure. (The evaporation gas generated in the liquefied gas storage tank 10) to increase the pressure of the suction fluid, so that the pressure of the suction fluid is reduced to a pressure of about 30 to 50 bar (preferably about 40 bar) The driving fluid can satisfy this by significantly increasing the flow rate relative to the pressure.

The controller 90 receives the required evaporation gas amount from the first customer 60 and the required power amount of the ship from the outside and can control the supply of the liquefied gas or the evaporated gas according to the required power amount of the ship. And a second control unit 92. [0033]

The first control unit 91 calculates the evaporated gas required amount (hereinafter referred to as the first demanded amount of necessary gas) of the first demanded customer 60 for generating the power used by the first demanded customer 60, The supply amount of the liquefied gas and the evaporation gas is selected through the second control unit 92 by comparing the demanded gas amount with the demanded gas amount and the evaporated gas generation amount of the liquefied gas storage tank 10 with each other.

The second control unit 92 controls the supply of the liquefied gas and the evaporative gas and controls the liquefied gas so that the front end pressure of the first customer 60 is maintained at about 40 bar.

Hereinafter, the first and second control units 91 and 92 will be described in detail.

The first control unit 91 can calculate the amount of gas required for the first demanding customer and can control the second control unit 92 to operate by comparing the amount of gas required for the first demanding place with the amount of evaporation gas generated in the liquefied gas storage tank 10 have.

The first control unit 91 may be connected to the second control unit 92, the second pressure sensor 902 and the first customer 60 in a wired or wireless manner.

The first control unit 91 can receive the internal pressure value of the liquefied gas storage tank 10 through the second pressure sensor 902 and calculate the amount of evaporative gas generated in the liquefied gas storage tank 10, The amount of gas necessary for the first customer can be calculated through a separate calculation table provided in the control unit 91. [

Here, in the calculation table, if a value calculated through a predetermined user value or a power estimated consumption amount of other power mechanisms is input to the input value, the corresponding result value, that is, Is described.

Hereinafter, the operation mechanism of the first control unit 91 will be described.

The first control unit 91 commands the first customer 60 to start operating based on the first demanded amount of gas required by the first customer,

Then, when the amount of evaporated gas generated in the liquefied gas storage tank 10 is compared with the amount of gas required for the first customer, if the amount of gas required for the first customer is larger than the amount of evaporated gas generated in the liquefied gas storage tank 10, And transmits a second command to the second control unit 92 when the amount of gas required for the first demanding customer is less than the amount of evaporation gas generated in the liquefied gas storage tank 10. [

The first command is a command to supply both the liquefied gas and the evaporated gas to the first customer 60. The second command is a command to stop supplying the liquefied gas to the first customer 60 and supply only the evaporated gas, And the gas is supplied to the third customer (62).

The second pressure sensor 902 is provided at one side of the inside or outside of the liquefied gas storage tank 10 and is connected to the liquefied gas storage tank 10 which is raised by the evaporation gas generated in the liquefied gas storage tank 10 The internal pressure can be measured and transmitted to the first control unit 91 by wire or wirelessly.

In the embodiment of the present invention, the required power amount of the ship is compared with the evaporated gas amount in the liquefied gas storage tank 10 through the first control unit 91, and the required power of the ship is continuously produced by parallel driving, The internal pressure of the storage tank 10 can be appropriately adjusted and the first consumer 60 can be smoothly driven.

The second control unit 92 further includes a first pressure sensor 901 and a first pressure sensor 901, a first pump 11, an evaporation gas control valve 621, a bypass valve 111, And may be connected to the first control unit 91 by wire or wirelessly.

The second control unit 92 receives the pressure value from the first pressure sensor 901 and when the amount of the first demanded gas required by the user is larger than the evaporation gas generation amount of the liquefied gas storage tank 10, The first pump 11 and the bypass valve 111 are driven by receiving the first command and when the amount of evaporated gas required by the first customer 60 is less than the amount of evaporated gas generated by the liquefied gas storage tank 10, 1 control unit 91 and can drive the first pump 11 and the evaporation gas control valve 621. [

The first pressure sensor 901 is provided between the first customer 60 on the second line L2 and the second heat exchanger 13 to measure the pressure of the fuel supplied to the first customer 60 It can be transmitted to the first control unit 90 by wire or wirelessly.

Hereinafter, the mechanism of the second control unit 92 will be described.

First, a mechanism when the second control unit 92 receives the first command from the first control unit 91 will be described.

 The second control unit 92 receives the first command from the first control unit 91 and then drives the first pump 11 to supply it to the intake apparatus 22 so that the second control unit 92 can control the operation of the liquefied gas storage tank 10 The bypass valve 111 is opened to bypass the fifth line L5 by the difference in the amount of evaporation gas generated in the liquefied gas storage tank 10 from the amount of gas required for the first customer, (13).

The second control unit 92 receives the pressure of the first consumer 60 on the second line L2 from the first pressure sensor 901 and determines that the front end pressure of the first consumer 60 is higher than the pressure of the first consumer 60, (Preferably about 40 bar), the power supplied to the first pump 11 is reduced to reduce the load of the first pump 11 to reduce the flow rate of the discharged liquefied gas The power supplied to the first pump 11 may be increased to increase the power supplied to the first pump 11 when the pressure of the first consumer 60 is lower than the pressure required by the first consumer 60 (preferably about 40 bar) 11 can be increased and the flow rate of the liquefied gas discharged can be increased.

At this time, the entire evaporation gas generated in the liquefied gas storage tank 10 is pressurized by the suction of the intake device 22 and supplied to the first customer 60.

In the above description, when the pressure at the front end of the first consumer 60 is higher than the pressure required by the first consumer 60 (preferably about 40 bar), the pressure of the evaporation gas generated in the liquefied gas storage tank 10 Is a fluctuation state in which the amount of supply of the first pump 11 is temporarily increased so that the amount of gas is larger than the amount of gas necessary for the first customer (not steady state).

Next, the mechanism when the second control unit 92 receives the second command from the first control unit 91 will be described.

The second control unit 92 receives the second command from the first control unit 91 and then drives the first pump 11 to supply it to the intake device 22 so that the second control unit 92 can control the operation of the liquefied gas storage tank 10 The evaporation gas is inhaled and the evaporation gas control valve 621 is opened so that the amount of evaporation gas generated in the liquefied gas storage tank 10 is equal to the difference in the amount of the first demanded gas required by the third customer L4 ). At this time, only the evaporated gas is supplied to the first consumer 60.

Thereafter, the second control unit 92 operates the first pump 11 by the same mechanism as when the amount of gas required for the first demanding customer is larger than the amount of evaporation gas generated in the liquefied gas storage tank 10, It is possible to keep the pressure of the inlet end at a constant level.

That is, the second control unit 92 receives the pressure of the first consumer 60 on the second line L2 from the first pressure sensor 901, and when the pressure of the first consumer 60 reaches the first consumer, (Preferably about 40 bar), the power supplied to the first pump 11 is reduced to reduce the load of the first pump 11 to reduce the flow rate of the discharged liquefied gas The power supplied to the first pump 11 may be increased to increase the power supplied to the first pump 11 when the pressure of the first consumer 60 is lower than the pressure required by the first consumer 60 (preferably about 40 bar) 11 can be increased and the flow rate of the liquefied gas discharged can be increased.

As described above, the liquefied-gas treatment system 1 according to the present invention can supply the liquefied gas and the evaporated gas through the intake apparatus 22, simplifying the apparatus necessary for the evaporative gas treatment, The space available in the ship is increased and the driving reliability is improved.

In addition, it is possible to efficiently manage the internal pressure of the liquefied gas storage tank 10 by processing the liquefied gas and the evaporated gas according to the required power of the ship, and to control the internal pressure of the liquefied gas storage tank 10 through the first pump 11 and the first pressure sensor 901 1, the fuel can be supplied to the customer 60 at a constant pressure, and the operation efficiency of the first customer 60 is increased.

FIG. 8 is a conceptual diagram showing a liquefied gas processing system according to an embodiment of the present invention, and FIG. 9 is a P-Q graph derived by a first pump according to an embodiment of the present invention.

8 and 9, a liquefied gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a first pump 11, a first heat exchanger 12, A second heat exchanger 13, an intake apparatus 22, a first customer 60, and a first controller 90. Here, the vessel (not shown) may be, for example, a gas turbine propulsion LNG carrier or a container ship. If the vessel is a container ship, the liquefied gas storage tank 10 may be a B type tank, but is not limited thereto.

Hereinafter, a liquefied gas processing system 1 according to an embodiment of the present invention will be described with reference to Fig.

The liquefied gas storage tank 10 is the same as or similar to that described in the embodiment of Fig. 1 of the present invention, so that the first pump 11 and the first customer 60 are arranged in the embodiment of Fig. 5 The same or similar to that described above.

The first heat exchanger 12 can be supplied with the liquefied gas pressurized by the first pump 11 at 30 to 50 bar (preferably about 40 bar) and can be heated. Specifically, the first heat exchanger 12 is provided between the first pump 11 and the intake device 22 on the first line L1 to supply the pressurized liquefied gas supplied from the first pump 11 And then supplied to the intake apparatus 22 so that the intake apparatus 22 sucks the evaporated gas generated in the liquefied gas storage tank 10.

The first heat exchanger 12 may use glycol water, steam, sea water, or the like as a heat source for heating the liquefied gas, (22).

The second heat exchanger 13 can supply and heat the liquefied gas pressurized by the intake device 22 to 30 to 50 bar (preferably about 40 bar). Specifically, the second heat exchanger 13 is provided between the intake device 22 on the second line L2 and the first demander 60 and receives the pressurized liquefied gas supplied from the intake device 22 It is possible to supply the liquefied gas in a state required by the first customer 60 by supplying the liquefied gas to the first customer 60 after heating to about 40 to 50 degrees.

That is, the second heat exchanger 13 is supplied with the mixed gas gas having a pressure of about 30 to 50 bar (preferably about 40 bar) from the intake device 22, 45 degrees) and then supplied to the first customer 60. The second heat exchanger 13 may use glycol water, steam or sea water as a heat source for heating the liquefied gas, And can be supplied to the customer 60.

The intake apparatus 22 is a system in which liquefied gas which is pressurized from the first pump 11 and vaporized and supplied through the first heat exchanger 12 is used as a driving fluid, An evaporator may be supplied with the liquefied gas to suck the evaporated gas generated in the liquefied gas storage tank 10 and supply the evaporated gas to the second heat exchanger 13. An Ejector, Lt; / RTI >

Specifically, the intake apparatus 22 is provided between the liquefied gas storage tank 10 and the second heat exchanger 13 on the second line L2 and is connected to the first line L1, L1 to supply the liquefied gas stored in the liquefied gas storage tank 10 in a vaporized state and suck the evaporated gas generated in the liquefied gas storage tank 10 through the second line L2 to be supplied to the second heat exchanger 13).

Here, the intake device 22 supplies the calculated amount of the driving fluid to the first line L1 through the first pump 11 so as to suck all the amount of evaporated gas generated in the liquefied gas storage tank 10 Can receive. The control unit 90 will be described in detail.

The intake device 22 receives the liquefied gas vaporized by the driving fluid and sucks the evaporated gas generated in the liquefied gas storage tank 10 to mix the liquefied gas and the evaporated gas as the driving fluid, The kinetic energy is converted into the kinetic energy of the entire mixed fluid and then the kinetic energy of the mixed fluid is increased again as the velocity of the mixed fluid at the end portion of the nozzle (not shown) of the intake device 22 is enlarged Pressure. As a result, the evaporated gas generated in the liquefied gas storage tank 10 has a pressure of about 30 to 50 bar (preferably about 40 bar).

In the present invention, the pressure at which the first pump 11 is also pressurized is also about 30 to 50 bar (preferably about 40 bar) or the driving fluid introduced into the intake device 22 is relatively low in pressure and falls in pressure. (The evaporation gas generated in the liquefied gas storage tank 10) to increase the pressure of the suction fluid, so that the pressure of the suction fluid is reduced to a pressure of about 30 to 50 bar (preferably about 40 bar) The driving fluid can satisfy this by significantly increasing the flow rate relative to the pressure.

The control unit 90 further includes a first flow sensor 903, a second pressure sensor 902 and a third pressure sensor 904 and includes a first flow sensor 903, a second pressure sensor 902, And receives the flow rate value from the first flow rate sensor 903 and receives the pressure value from the second pressure sensor 902 and the third pressure sensor 904. The flow rate value is received from the third pressure sensor 904 by wire or wirelessly. 9, the flow rate value and the pressure value received from the first flow sensor 903 and the third pressure sensor 904, and the flow rate value and the pressure value received from the third pressure sensor 904, The throughput of the evaporated gas generated in the storage tank 10 can be calculated.

The first flow sensor 903 is provided between the first customer 60 on the second line L2 and the second heat exchanger 13 to measure the flow rate of the fuel supplied to the first customer 60 And the second pressure sensor 902 is provided on one side of the inside or the outside of the liquefied gas storage tank 10 so as to be able to transmit the evaporation gas generated in the liquefied gas storage tank 10 The third pressure sensor 904 can measure the internal pressure of the liquefied gas storage tank 10 raised by the gas and send it to the first control unit 91 either by wire or wirelessly, The pressure generated in the outflow end of the first pump 11 may be measured between the first pump 11 and the first heat exchanger 12 and transmitted to the controller 90 in a wired or wireless manner.

Hereinafter, a mechanism for calculating the throughput of the evaporated gas generated in the liquefied gas storage tank 10 through the control unit 90 will be described, and a PQ graph derived by the first pump shown in FIG. 9 will be described .

9 is a P-Q graph derived by a first pump according to an embodiment of the present invention. The horizontal axis represents the volume flow rate Q discharged from the outlet end of the first pump 11 and the vertical axis represents the pressure P at the outlet end of the first pump 11 measured at the outlet end of the first pump 11 ), And the three curves drawn on the graph show PQ diagrams when the RPM of the first pump 11 is A, B, or C, respectively. Here, the case where the RPM of the first pump 11 is B RPM will be described as an example (this RPM value can be known when the first pump 11 is driven).

The control unit 90 receives the pressure value P1 generated at the outlet end of the first pump 11 through the third pressure sensor 904 and calculates the B RPM curve shown in the PQ graph derived by the first pump, It is possible to calculate the volume flow rate value Qx.

The control unit 90 determines whether or not the calculated volume flow rate value Qx and the density value derived through the pressure value P1 (the density value can be calculated through a function of temperature and pressure, wherein the temperature is the temperature of the liquefied gas storage tank 10 And the discharge mass flow rate value M1 of the first pump 11 can be calculated.

The formula for calculating the discharge mass flow rate value M1 of the first pump 11 is as follows.

Qx * density value derived from the density function (P, T) = discharge mass flow rate value M1 of the first pump 11

Thereafter, the control unit 90 calculates the discharge mass flow rate value of the first pump 11 calculated above from the mass flow rate value M2 of the fuel supplied to the first customer 60 via the first flow rate sensor 903 The mass flow rate of the evaporated gas generated in the liquefied gas storage tank 10 can be calculated.

The control unit 90 compares the calculated mass flow rate with the calculated internal pressure of the liquefied gas storage tank 10 (hereinafter referred to as a predetermined storage tank internal pressure) so that the mass flow rate of the treated mass is greater than the internal pressure of the preset storage tank It is possible to control so as to reduce the discharge flow rate of the first pump 11 and increase the discharge flow rate of the first pump 11 when the treatment mass flow rate value is smaller than the predetermined storage tank internal pressure value.

At this time, the treatment mass flow rate value can be converted to a pressure value that can be compared with the preset storage tank pressure value by the flow unit or the flow-pressure substitution table. In addition, the predetermined storage tank internal pressure value may be measured by the second pressure measurement sensor 902 and transmitted to the control unit 90 by wire or wirelessly.

The controller 90 can control the internal pressure of the liquefied gas storage tank 10 to be constantly maintained.

As described above, the liquefied-gas treatment system 1 according to the present invention can supply the liquefied gas and the evaporated gas through the intake apparatus 22, simplifying the apparatus necessary for the evaporative gas treatment, The space available in the ship is increased and the driving reliability is improved.

Further, the liquefied gas processing system 1 according to the present invention has the effect of reducing the installation of the flowmeter by installing the flowmeter only at the front end of the first consumer 60.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: liquefied gas processing system 10: liquefied gas storage tank
11: first pump 111: bypass valve
112: Evaporative gas discharge valve 113: Evaporative gas separation valve
12: first heat exchanger 13: second heat exchanger
20: Evaporative gas compressor 21: Preheater
22: Suction device 30: Re-condenser
40: second pump 50: vaporizer
60: First Demand Point 61: Second Demand Point
62: Third demand point 621: Evaporative gas control valve
70: Propeller 71: Propeller shaft
72: clutch 80: shaft generator
90: control unit 901: first pressure sensor
902: second pressure sensor 903: flow sensor
904 Third pressure sensor 91: First control unit
92: second control section 93: third control section
L1: first line L2: second line
L3: third line L4: fourth line
L5: Line 5

Claims (7)

A first flow path in which liquefied gas stored in the liquefied gas storage tank is supplied to the engine;
A second flow path for supplying the evaporated gas generated from the liquefied gas storage tank to the engine;
A third flow path in which the evaporation gas generated in the liquefied gas storage tank is supplied to the gas consuming place; And
The required amount of gas for the first demanded customer and the amount of evaporated gas in the liquefied gas storage tank are compared with each other when the required amount of evaporation gas of the engine necessary for generating the electric power to be used by the engine is the first demanded amount of the demanded gas, And a control unit for controlling only the flow of the first flow path among the flow of the fluid in the third flow path from the first flow path to the inlet end pressure of the engine,
Wherein the second flow path includes an evaporative gas compressor for multi-stage compressing the evaporative gas generated in the liquefied gas storage tank, the first flow path being connected to the downstream of the evaporative gas compressor,
Wherein,
Wherein when the inflow end pressure of the engine is equal to or greater than a predetermined value, the flow of the first flow path is reduced,
And increases the flow of the first flow path when the inflow end pressure of the engine is less than a predetermined value. The apparatus of claim 1,
And the liquefied gas in the liquefied gas storage tank is supplied to the engine through the first flow path when the amount of the first demanded gas required by the user is larger than the amount of evaporated gas generated in the liquefied gas storage tank,
And controls the supply of the evaporated gas of the liquefied gas storage tank to the gas consuming destination through the third flow path when the amount of the first demanded gas required by the user is smaller than the evaporated gas generation amount of the liquefied gas storage tank system. The method of claim 1, wherein
Wherein the first flow path includes a pump driven by varying a pressure or a flow rate of the liquefied gas discharged according to the supply of electric power,
The third flow path includes an evaporative gas discharging means for regulating the supply to the gas consuming source,
Wherein,
The pump supplies the difference between the amount of the first demanded gas required by the user and the evaporated gas generation amount of the liquefied gas storage tank when the amount of the first demanded gas required by the user is larger than the evaporated gas generated by the liquefied gas storage tank,
The amount of evaporative gas generated in the liquefied gas storage tank and the amount of the required amount of the first demanded gas in the liquefied gas storage tank are supplied to the gas consuming device through the evaporative gas discharging means, To the liquefied gas processing system. The apparatus of claim 1,
A first control unit for comparing the amount of the first demanded gas required by the user with the amount of evaporated gas generated in the liquefied gas storage tank and instructing control of the flow of the fluid in the first flow path and the second flow path;
A second control unit for controlling the flow of the fluid in the first flow path; And
And a third control unit for controlling the flow of the fluid in the second flow path or the third flow path. 5. The apparatus of claim 4,
Calculates the first demanded amount of the required gas,
A first command is given to the second and third control units when the amount of the first demanded gas required by the user is larger than the amount of evaporated gas generated in the liquefied gas storage tank,
And instructs the second and third control units to issue a second command when the first demand source gas amount is less than the evaporation gas generation amount of the liquefied gas storage tank. 6. The method of claim 5,
Wherein the first instruction comprises:
The second control unit causes the liquefied gas in the liquefied gas storage tank to be supplied to the engine through the first flow path, and the third control unit cuts off the third flow path, so that the evaporation gas of the liquefied gas storage tank A command to shut off supply to the gas consuming place,
Wherein the second instruction comprises:
The second control unit interrupts the first flow path to block supply of the liquefied gas of the liquefied gas storage tank to the engine, and the third control unit causes the third control unit to shut off the liquefied gas stored in the liquefied gas storage tank And a command to cause the evaporation gas to be supplied to the gas consuming place. The method of claim 1, wherein
The first flow path includes a pump driven by varying a pressure or a flow rate of the liquefied gas discharged according to the supply of electric power; And
And a vaporizer for vaporizing the liquefied gas supplied through the pump,
The third flow path includes an evaporative gas discharge means for regulating the supply to the gas consuming source,
Further comprising a pressure measuring device provided at an inlet end of the engine for measuring the first pressure when the inlet end pressure of the engine is a first pressure,
Wherein,
The pump supplies the difference between the amount of the first demanded gas required by the user and the evaporated gas generation amount of the liquefied gas storage tank when the amount of the first demanded gas required by the user is larger than the evaporated gas generated by the liquefied gas storage tank,
When the first pressure measured by the pressure measuring device is lower than the pressure demanded by the engine, increases the discharge flow rate of the pump, and when the first pressure is higher than the pressure required by the engine, Reducing the flow rate,
The amount of evaporative gas generated in the liquefied gas storage tank and the amount of the required amount of the first demanded gas in the liquefied gas storage tank are supplied to the gas consuming device through the evaporative gas discharging means, To the liquefied gas processing system.

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