KR20160120373A - Fuel gas supply system - Google Patents

Abstract

A fuel gas supply system is disclosed. A fuel gas supply system according to an embodiment of the present invention includes a storage tank for storing a liquefied gas and an evaporated gas of the liquefied gas; A compression unit for compressing the evaporation gas supplied from the storage tank; A first pump for pressurizing the liquefied gas supplied from the storage tank; A vaporizer for vaporizing the pressurized liquefied gas; A first supply line for supplying the evaporation gas stored in the storage tank to the engine via the compression unit; A second supply line that joins the liquefied gas stored in the storage tank to the downstream end of the compression section of the first supply line via the first pump and the vaporizer; A measuring unit for measuring a pressure or an amount of the evaporation gas supplied to the engine; And a control unit for controlling the first pump and the vaporizer based on the measured value to supply the liquefied gas through the second supply line.

Description

FUEL GAS SUPPLY SYSTEM [0002]

The present invention relates to a fuel gas supply system.

As IMO regulations on the emission of greenhouse gases and various air pollutants are strengthened, shipbuilding and marine industries are replacing the use of conventional oil and diesel oil with natural gas, which is a clean energy source, In many cases.

Natural gas, which is widely used as a fuel gas, is mainly stored as methane and is stored and transported in a liquefied gas state where the volume thereof is reduced to 1/600.

The liquefied gas carrier has an insulated storage tank to store the liquefied gas. The engine of this ship uses the liquefied gas of the storage tank as the fuel by forcibly vaporizing it or uses the boiled off gas naturally occurring in the storage tank as the fuel. Of course, since such a liquefied gas carrier carries an engine capable of utilizing a different fuel, it can have a storage tank for storing fuel gas or fuel oil separately, not transportation cargo.

On the other hand, when there are a lot of liquefied gas contained in the storage tank, since there are many evaporative gases naturally generated in the storage tank, it is not infeasible to use it as the fuel of the engine. However, when the amount of liquefied gas contained in the storage tank is small, the amount of evaporation gas generated naturally is small, which makes it difficult to use it as fuel for the engine. Furthermore, when the load of the engine becomes large and the required fuel supply amount becomes large, it is necessary to adjust the flow rate required by the engine. Please refer to Korean Patent Laid-Open No. 10-2012-0103421 (published on September 19, 2012) as related art related thereto.

Korean Patent Laid-Open No. 10-2012-0103421 (published on September 19, 2012)

An embodiment of the present invention is intended to provide a fuel gas supply system that enables an effective flow rate supply to be performed according to a fuel supply amount required by an engine.

According to an aspect of the present invention, there is provided a storage tank for storing a liquefied gas and an evaporated gas of the liquefied gas; A compression unit for compressing the evaporation gas supplied from the storage tank; A first pump for pressurizing the liquefied gas supplied from the storage tank; A vaporizer for vaporizing the pressurized liquefied gas; A first supply line for supplying the evaporation gas stored in the storage tank to the engine via the compression unit; A second supply line that joins the liquefied gas stored in the storage tank to the downstream end of the compression section of the first supply line via the first pump and the vaporizer; A measuring unit for measuring a pressure or an amount of the evaporation gas supplied to the engine; And a control unit for controlling the first pump and the vaporizer based on the measured value to supply the liquefied gas through the second supply line.

The measuring unit may include a pressure measuring unit installed between the rear end of the compression unit of the first supply line and the engine and measuring the pressure of the evaporation gas supplied to the engine, And a flow rate measuring unit which is installed in the engine and measures an amount of the evaporated gas supplied to the engine.

The compressor includes a plurality of compressors and a cooler disposed alternately with the compressor, and the compressor and the high-pressure pump can operate reciprocally.

And a buffer tank installed between the rear end of the compression section of the first supply line and the engine.

The fuel gas supply system according to the embodiment of the present invention can effectively supply the flow rate according to the fuel supply amount required by the engine.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 shows a fuel gas supply system according to an embodiment of the present invention.
2 shows a fuel gas supply system according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

Referring to FIG. 1, the fuel gas supply system 100 according to an embodiment of the present invention can effectively supplement the fuel supply amount required by the engine. The fuel gas supply system 100 includes various types of liquefied fuel carriers, liquefied fuel RVs (Regasification Vessels), container ships, general merchant ships, LNG FPSO (Floating, Production, Storage and Off-loading), LNG FSRU (Floating Storage and Regasification Unit) And the like.

The fuel gas supply system 100 includes a storage tank 10 for storing evaporative gas of liquefied gas and liquefied gas, a compression section 20 for compressing the evaporated gas supplied from the storage tank 10, a storage tank 10, A high pressure vaporizer 40 for vaporizing liquefied gas through the high pressure pump 30 and a high pressure pump 30 for supplying the evaporation gas supplied from the storage tank 10 to the compression unit 20, A first supply line L1 for supplying the liquefied gas supplied from the storage tank 10 to the engine E via the high pressure pump 30 and the high pressure vaporizer 40, A second supply line L2 connecting the rear end of the compression unit 20 to the rear end of the compression unit 20 and a second supply line L2 provided between the rear end of the compression unit 20 of the first supply line L1 and the engine E, A measurement unit for measuring at least one of a pressure and an amount of the evaporation gas supplied to the engine E via the evaporator 20; The high pressure pump 30 and the high pressure vaporizer 40 are operated to supply the vaporized liquefied gas through the second supply line L2 based on the result of comparison between the values And a control unit 60 that replenishes the supply amount. The measuring unit may be implemented by a pressure measuring unit 50 and a flow measuring unit 55, as shown in FIGS.

1, the liquefied gas stored in the storage tank 10 may be stored in a liquefied natural gas (LNG), a liquefied petroleum gas (LPG), a dimethyl ether (DME), or an ethane But it is not limited thereto. The storage tank 10 may include a membrane type tank, an SPB type tank, and the like which store the fuel in a liquefied state while maintaining an adiabatic state. When the liquefied gas is LNG, the storage tank 10 can maintain the internal pressure at 1 bar or the pressure higher than the internal pressure in consideration of the fuel supply condition, and maintain the internal temperature at about -163 DEG C to maintain the liquefied state.

The evaporated gas of the liquefied gas stored in the storage tank 10 is supplied to the engine E through the first supply line L1. Here, the engine E may be a high-pressure gas injection engine such as an ME-GI engine.

The compression section 20 includes a plurality of compressors 22 and a cooler 24 arranged alternately with the compressor 22 and is supplied from the storage tank 10 to meet the fuel gas supply conditions of the engine E And the evaporation gas of the liquefied gas is compressed.

At this time, in the intermediate compression step of the compression section 20, when the branched line D1 is branched and the amount of evaporated gas of the liquefied gas supplied from the storage tank 10 is larger than the fuel supply amount required by the engine E , And a part of the evaporated gas can be supplied to the customer 90 via the branch line D1. The customer 90 may include, for example, a low pressure gas injection engine such as a DFDE engine or the like, a turbine or the like.

The pressure measuring part 50 is provided between the rear end of the compression part 20 of the first supply line L1 and the engine E and is connected to the evaporation gas of the liquefied gas supplied to the engine E via the compression part 20 Measure the pressure. 1, the pressure measuring unit 50 is provided between the confluence point C and the engine E. However, the pressure measuring unit 50 may be provided between the rear end of the compression unit 20 and the confluence point C in another example.

As the load of the engine E becomes larger, the required fuel supply amount increases. At this time, when the engine E draws a lot of the evaporation gas supplied through the first supply line L1, the amount of the evaporation gas supplied to the engine E by using the amount larger than the maximum flow rate of the compression section 20 The pressure is measured low by the pressure measuring part 50.

The control unit 60 determines whether or not the fuel supply amount required by the engine E is equal to the flow rate of the actual engine E supplied to the actual engine E when the pressure of the evaporation gas measured by the pressure measuring unit 50 is lower than the set pressure . In this case, the control unit 60 opens the valve V1 provided in the second supply line L2, operates the delivery pump 12 in the storage tank 10 to discharge the liquefied gas stored in the storage tank 10 Pressure pump 30 and the high-pressure carburetor 40 are operated to supply vaporized liquefied gas to replenish the fuel supply amount required by the engine E .

Here, the high-pressure pump 30 receives the liquefied gas from the storage tank 10 and raises the fuel gas supply pressure of the engine E to 150 to 300 bar, and sends it to the high-pressure vaporizer 40. At this time, as described above, the feed pump 12 is installed inside the storage tank 10, and the liquefied gas stored in the storage tank 10 according to the preset pressure is supplied to the high-pressure pump 30 through the second supply line L2, . The high-pressure vaporizer 40 vaporizes the high-pressure liquefied gas through the high-pressure pump 30 and sends it to the junction point C with the first supply line L1 through the second supply line L2. The vaporized liquefied gas supplied through the second supply line L2 is mixed with the evaporation gas supplied through the first supply line L1 and supplied to the engine E. [ This makes it possible to effectively supplement the fuel supply amount required by the engine E.

Meanwhile, the compressor 22 and the high-pressure pump 30 included in the compression unit 20 may be reciprocating pumps and repeat the decompression, suction, pressurization, and discharge processes. In this process, the pressure of the discharge part rises and falls repeatedly, and since the fluid does not continuously flow out, the flow rate continuously changes.

The buffer tank 70 may be provided between the rear end of the compression section 20 of the first supply line L1 and the engine E in order to reduce the change in the flow rate of the fluid supplied to the engine E. [ In FIGS. 1 and 2, a buffer tank 70 is provided between the junction point C of the first supply line L1 and the engine E, for example.

Hereinafter, a fuel gas supply system 100 according to another embodiment of the present invention will be described with reference to FIG. 2, but the contents overlapping with FIG. 1 will be omitted.

Referring to FIG. 2, the flow rate measuring unit 55 may be installed at one or more of the front end and the rear end of the compression unit 20 of the first supply line L1. The flow rate measuring section 55 can be used to measure the amount of the evaporated gas supplied from the storage tank 10 through the first supply line L1. 2, the flow rate measuring unit 55 is disposed between the rear end of the compression unit 20 and the junction point C. However, in another example, the flow rate measurement unit 55 is disposed between the junction point C and the engine E .

The control unit 60 determines whether or not the flow rate measured by the flow rate measuring unit 55 is equal to or greater than a predetermined value that has been measured by the flow rate measuring unit 55 based on the result of comparison between the flow rate measured by the flow rate measuring unit 55 and the fuel supply amount The high pressure pump 30 and the high-pressure vaporizer 40 are operated as described above and the liquefied gas vaporized through the second supply line L2 is supplied to the engine E when the amount of the evaporation gas is smaller than the fuel supply amount required by the engine E. [ So that the fuel supply amount required by the engine E can be supplemented.

The pressure measuring unit 50 and the flow measuring unit 55 may perform wire / wireless communication with the controller 60 and may transmit and receive various control data, measured values, and set values.

The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

10: storage tank 20: compression section
30: high pressure pump 40: high pressure vaporizer
50: Pressure measuring part 55: Flow measuring part
60: control unit 70: buffer tank
L1, L2: Supply line D1: Branch line

Claims (4)

A storage tank for storing a liquefied gas and an evaporation gas of the liquefied gas;
A compression unit for compressing the evaporation gas supplied from the storage tank;
A first pump for pressurizing the liquefied gas supplied from the storage tank;
A vaporizer for vaporizing the pressurized liquefied gas;
A first supply line for supplying the evaporation gas stored in the storage tank to the engine via the compression unit;
A second supply line that joins the liquefied gas stored in the storage tank to the downstream end of the compression section of the first supply line via the first pump and the vaporizer;
A measuring unit for measuring a pressure or an amount of the evaporation gas supplied to the engine; And
And a control unit for controlling the first pump and the vaporizer based on the measured value to supply the liquefied gas through the second supply line. The method according to claim 1,
The measuring unit may include a pressure measuring unit installed between the rear end of the compression unit of the first supply line and the engine and measuring the pressure of the evaporation gas supplied to the engine,
And a flow rate measuring section provided at a front end or a rear end of the compression section of the first supply line for measuring an amount of the evaporation gas supplied to the engine. The method according to claim 1,
Wherein the compressor includes a plurality of compressors and a cooler disposed alternately with the compressor,
Wherein the compressor and the high-pressure pump operate reciprocally. The method of claim 3,
And a buffer tank installed between the engine and the downstream end of the compression section of the first supply line.

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