KR20160075352A - Heat recovery system, ship including the same, and heat recovery method - Google Patents

Abstract

(Problem) Provided is an arrangement / retrieval system which can reduce the cost and secure the installation space when introducing the water separator used in the low pressure steam generator of the exhaust gas economizer.
An exhaust gas economizer (3) in which a first steam generator (3a) and a second steam generator (3b) are arranged from the upstream side to the downstream side of an exhaust gas flow derived from a ship cycle, A second auxiliary boiler 5b having a second furnace 5b1 and a second steam drum 5b2 and a second auxiliary boiler 5b having a first steam generator 5a1 and a first steam drum 5a2, A first circulation flow passage connected to use the first steam drum 5a2 as a water separator of the first steam generator 3a and a second circulation flow passage connected to use the second steam drum 5b2 as a water separator of the second steam generator 3b, And a circulating flow path.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an array reclamation system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust purification system having an exhaust gas economizer for recovering exhaust heat from an exhaust gas derived from a ship cycle such as a diesel engine (main machine), a ship having the exhaust recovery system, and an arrangement recovery method.

BACKGROUND ART Conventionally, in a system using a large-sized diesel engine (ship cycle) for propelling a ship, heat energy of exhaust gas discharged from a diesel engine is heat-recovered by an exhaust gas economizer to generate steam, BACKGROUND ART [0002] Array recovery systems for use in steam, power generation, and the like are known. In this way, the energy input to the ship is recovered without releasing it to the atmosphere, thereby improving the energy efficiency of the ship.

However, since the thermal efficiency of the diesel engine is improved year by year due to recent technology development, the amount of heat that can be recovered from the exhaust gas by the exhaust gas economizer is decreasing. In order to recover heat under such a small amount of heat, the steam generating portion of the exhaust gas economizer may be divided into a high-pressure portion and a low-pressure portion to recover heat to a low temperature (low pressure) (see Patent Document 1).

Japanese Patent Application Laid-Open No. 57-49704

However, in Patent Document 1, when a low-pressure steam generating portion is to be additionally provided in addition to a high-pressure steam generating portion, a low-pressure steam generating portion is newly introduced into a low pressure water separator (see 2A in FIG. ) Must be installed. In this case, the cost and installation space of the low pressure water separator are required, which hinders cost reduction and secures installation space.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide an exhaust heat recovery system which can reduce cost and secure installation space when introducing a water separator used in an exhaust gas economizer low pressure steam generator, And a method thereof.

Means for Solving the Problems In order to solve the above problems, the array collection system of the present invention, the vessel provided with the array collection system, and the array collection method adopt the following means.

That is, the exhaust gas reclaiming system according to the present invention comprises: an exhaust gas economizer in which a first steam generator and a second steam generator are disposed downstream from an upstream side of an exhaust gas flow derived from a ship cycle; A first drum boiler having a steam drum, a second drum boiler having a second furnace and a second steam drum, a first circulating flow passage connected to use the first steam drum as a water separator of the first steam generator, And a second circulation flow passage connected to use the second steam drum as a water separator of the second steam generator.

The arrangement is recovered from the first steam generator and the second steam generator from which the exhaust gas from the ship cycle is induced. Since the first steam generator is formed on the upstream side of the exhaust gas flow and the second steam generator is formed on the downstream side of the exhaust gas flow of the first steam generator, the first steam generator produces steam of higher pressure than the second steam generator Loses.

The steam generated in the first steam generator is led to the first steam drum of the first drum boiler through the first circulation passage. The first steam drum is used as a water separator to separate water vapor and water. The water separated in the first steam drum is returned to the first steam generator through the first circulation channel.

The water vapor generated in the second steam generator is led to the second steam drum of the second drum boiler through the second circulation channel. The second steam drum is used as a water separator, separating water vapor and water. The water separated from the second steam drum is returned to the second steam generator through the second circulation passage.

As a result of intensive studies, the inventors of the present invention have focused on the fact that a plurality of drum boilers, which are so-called auxiliary boilers, are provided for securing redundancy and necessary capability. The auxiliary boiler, which is generally used in ships, is used to generate hull cargo steam, etc., which is required in the ship during navigation or during berth. Further, when the ship is an oil tanker, it is necessary to drive the cargo oil pump to load and unload the oil at the destination. The cargo oil pump is equipped with a turbine (cargo oil pump turbine), and the turbine is driven by steam. The steam for driving the cargo oil pump turbine is supplied by the auxiliary boiler because the cycle is stopped during berth and the steam can not be generated by the exhaust gas economizer.

Therefore, in the present invention, the second steam drum of the second drum boiler is used as the water separator of the second steam generator. Thereby, it is not necessary to separately install the water separator for the second steam generator, and the cost for installing the water separator separately can be reduced, and the space can be saved.

It is also necessary to perform a warm-up operation in which the boiler water in the boiler drum is heated by steam in order to reduce the dissolved oxygen in the boiler water while the auxiliary boiler is stopped during the running to prevent corrosion inside the boiler. In the present invention, since the auxiliary boiler is used during operation of the exhaust gas economizer, it is not necessary to newly generate steam for the warm-up operation for heating the auxiliary boiler, the required steam amount can be reduced, .

In the exhaust gas recirculation system according to the present invention, it is preferable that the exhaust gas recirculation system further comprises a control section for controlling the flow of the first circulation flow passage and the second circulation flow passage, wherein the control section controls, when the exhaust gas economizer is used, The circulating flow path is in a circulation state and the first circulation flow path and the second circulation flow path are made non-circulating when the exhaust gas economizer is not used.

Since the ship cycle is started during the navigation of the ship, it becomes possible to arrange and collect the exhaust gas by the exhaust gas economizer. Therefore, when the exhaust gas economizer is used, the control section sets the first circulation flow passage and the second circulation flow passage.

On the other hand, when the ship is stationary, the ship cycle is stopped or the load on the ship cycle is very small, so that the arrangement by the exhaust gas economizer is not performed. Therefore, when the exhaust gas economizer is not used, the control section sets the first circulation flow passage and the second circulation flow passage in a non-circulating state.

If in-vessel vapor is required in the non-use of the exhaust gas economizer, combustion is effected in the furnace of the first drum boiler and / or the second drum boiler to produce steam in the first steam drum and / or the second steam drum .

The control of the flow of the first circulation flow passage and the second circulation flow passage by the control section is typically performed by the oscillation of the pump or the opening and closing of the valve.

Further, in the arrangement recovery system of the present invention, a third circulation flow passage connected to use the second steam drum as the water separator of the first steam generator is provided, and the control section makes the first circulation flow passage non-circulating , And the third circulation flow path is in a circulation state.

Since the third circulation flow passage connected to use the second steam drum is formed as the water separator of the first steam generator, the second steam drum can be used as the water separator of the first steam generator. Thus, for example, even if the first drum boiler fails and the first steam drum can not be used, the second steam drum can be used instead of the first steam drum, so that the arrangement can be continuously recovered.

The control unit receives a signal indicating an unusable state of a sensor or the like capable of detecting a state in which the first steam drum can not be used and sets the first circulation channel to the non-circulation state and the third circulation channel to the circulation state Control is performed.

In the arrangement recovery system according to the present invention, the control unit ignites the first burner formed in the first furnace when the amount of generated steam or pressure obtained from the first steam drum is lowered to a predetermined value or less .

If the amount of steam or pressure generated from the first steam drum is less than a predetermined value, there is a fear that the steam demand in the ship may not be able to be supplied. Therefore, it is assumed that the first burner formed in the first furnace is ignited by the control unit to increase the generation amount or pressure of the steam generated in the first steam drum.

Specifically, when the amount of steam generated from the first steam drum is equal to or less than a predetermined value, specifically when the load of the ship cycle is lowered (for example, when the output of the ship cycle is equal to or less than 25% ).

In the exhaust heat recovery system of the present invention, the first steam output pipe for outputting steam from the first steam drum and / or the second steam output pipe for outputting steam from the second steam drum are formed with a pressure reducing valve .

By forming the pressure reducing valve in the first steam output pipe and / or the second steam output pipe, the pressure of the steam generated in the steam drum can be lowered. Thereby, the low-pressure steam can be supplied to the customer using the relatively low-pressure steam such as in-house private steam.

Further, the ship of the present invention is characterized in that it is provided with the arrangement collection system according to any one of claims 1 to 5, which arranges and recovers from the ship cycle and the exhaust gas from the ship cycle.

Since any of the above-described batch recovery systems is provided, it is possible to provide a ship having excellent energy efficiency.

In addition, the exhaust heat recovery method of the present invention is characterized by comprising: an exhaust heat recovery step of recovering a second exhaust heat recovered from the upstream side of an exhaust gas flow derived from a cycle for ship, A first drum water boiler having a first drum boiler having a steam drum, a first water separation step of separating steam obtained in the first arrangement cycle by the first steam drum, and a second drum boiler having a second burner and a second steam drum And a second water separation step of subjecting the steam obtained in the second arrangement number to odd separation by the second steam drum of the second water separation step.

When introducing the water separator used in the low-pressure steam generator of the exhaust gas economizer, the cost can be reduced and the installation space is not required to be secured.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic block diagram showing an arrangement recovery system according to a first embodiment of the present invention; Fig.
Fig. 2 is a schematic configuration diagram showing an arrangement recovery system as a reference example.
Fig. 3 is a schematic configuration diagram showing the arrangement retrieval system according to the second embodiment of the present invention.
4 is a schematic configuration diagram showing an operation state of the arrangement recovery system shown in Fig.
Fig. 5 is a schematic configuration diagram showing an arrangement recovery system according to a third embodiment of the present invention. Fig.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]

A first embodiment of the present invention will now be described with reference to Fig.

1, the exhaust gas recirculation system 1 installed on a ship is provided with a diesel cycle (ship cycle) (not shown), an exhaust gas economizer 3 for recovering the heat held by the exhaust gas discharged from the diesel cycle, And two auxiliary boilers 5a and 5b.

The ship of this embodiment is assumed to be an oil tanker and has a cargo oil pump for carrying in and out oil. The cargo oil pump has a cargo oil pump turbine driven by steam. The steam which becomes the driving source of the cargo oil pump turbine is generated by the two auxiliary boilers 5a and 5b.

The diesel cycle is, for example, a low-speed two-stroke, one-cycle uniprocessing system operated at a rated speed of 200 rpm or less, and drives a propeller (not shown) for ship propulsion. The exhaust gas which is led to the exhaust gas economizer 3 from the diesel cycle is, for example, about 210 DEG C for a 50% load (rated 100% load).

The exhaust gas economizer 3 is provided with a high-pressure steam generator 3a (first steam generator) and a low-pressure steam generator 3b (second steam generator) from the upstream side to the downstream side of the exhaust gas flow. The high-pressure steam generator (3a) and the low-pressure steam generator (3b) are heat transfer tube groups (groups) arranged in the order from the bottom to the top. A high temperature exhaust gas derived from the diesel cycle side flows in the flue. After flowing through the flue, the exhaust gas is discharged to the atmosphere through a chimney (not shown) connected to the downstream side. The exhaust gas economizer outlet temperature of the exhaust gas is about 170 캜 when the inlet temperature of the exhaust gas economizer 3 is about 210 캜.

The high-pressure steam generator 3a has an inlet header 3a1 from which feed water (about 80 deg. C) is introduced before the arrangement is recovered and an outlet header 3a2 from which the steam after the arrangement is recovered is introduced. The steam derived from the outlet header 3a2 is, for example, 170 deg. C, 7 bar (gauge pressure).

The low-pressure steam generator 3b includes an inlet header 3b1 for introducing water (about 80 ° C) before the arrangement is recovered, and an outlet header 3b2 for introducing steam after the arrangement is recovered. The steam derived from the outlet header 3b2 is, for example, 144 deg. C, 3 bar (gauge pressure).

The first auxiliary boiler 5a includes a first furnace 5a1, a first steam drum 5a2 disposed above, and a first water drum 5a3 disposed below the first furnace 5a1. The first furnace 5a1 has a burner (not shown), and performs combustion in the first furnace 5a1.

When the burner is ignited in the first furnace 5a1 and the water supply is heated in the boiler, the water rises from the first water drum 5a3 downward to the first steam drum 5a2, And is separated from the drum 5a2. As described above, the first auxiliary boiler 5a is originally a natural circulation type drum boiler. However, during the navigation of the ship, the first steam drum 5a2 is not used as a natural circulation type drum boiler, and the first steam drum 5a2 is used as a water separator of the high-pressure steam generator 3a.

A first water supply pipe 5a4 for supplying water from a water source (not shown) is connected to the first steam drum 5a2. The first circulation water pipe 5a6 for supplying water to the inlet header 3a1 of the high-pressure steam generator 3a is connected to the first steam drum 5a2. A first circulating water pump 5a7 is formed in the first circulating water pipe 5a6. The first circulating water pump 5a7 is subjected to an estrus by an instruction from a control unit (not shown). A first radix mixing pipe 5a8 is formed between the outlet header 3a2 of the high-pressure steam generator 3a and the first steam drum 5a2. The first circulating flow passage in which water and steam are circulated between the first steam drum 5a2 and the high-pressure steam generator 3a by the first circulating water pipe 5a6 and the first odd water mixing pipe 5a8 described above Respectively.

The steam after being separated from the first steam drum 5a2 is supplied to the customer of the high-pressure steam through the first steam output pipe 5a9. The demand for the high-pressure steam is, for example, an oil heating device for heating heavy oil, which is a fuel in the diesel cycle.

The second auxiliary boiler 5b has a capacity equivalent to that of the first auxiliary boiler 5a and has a second furnace 5b1 and a second steam drum 5b2 disposed thereabove in the same manner as the first auxiliary boiler 5a, And a second water drum 5b3 disposed below. The second furnace 5b1 is provided with a burner (not shown), and performs combustion in the second furnace 5b1.

When the burner is ignited in the second furnace 5b1 and the water supply is heated in the boiler, the water rises from the second water drum 5b3 downward to the second steam drum 5b2, And is separated from the drum 5b2. Thus, the second auxiliary boiler 5b is essentially a natural circulation type drum boiler. However, during the navigation of the ship, the second drum 5b2 is not used as a natural circulation type drum boiler, and the second drum 5b2 is used as a water separator of the low-pressure steam generator 3b.

And a second water supply pipe 5b4 for supplying water from a water source (not shown) is connected to the second steam drum 5b2. The second circulation water pipe 5b6 for supplying water to the inlet header 3b1 of the low-pressure steam generator 3b is connected to the second steam drum 5b2. A second circulating water pump 5b7 is formed in the second circulating water pipe 5b6. The second circulating water pump 5b7 is subjected to estrus by a command from a control unit (not shown). A second radix mixing pipe 5b8 is formed between the outlet header 3b2 of the low-pressure steam generator 3b and the second steam drum 5b2. The second circulation flow path in which water and steam are circulated between the second steam drum 5b2 and the low pressure steam generator 3b by the second circulation water pipe 5b6 and the second water water mixing pipe 5b8 described above Respectively.

The steam after being separated from the second steam drum 5b2 is supplied to the customer of the low-pressure steam through the second steam output pipe 5b9. The low pressure steam is used, for example, as in-situ steam.

The control unit uses the auxiliary boilers 5a and 5b as the original natural circulation drum boiler or stops the operation of the auxiliary boilers 5a and 5b as the natural circulation type drum boiler in accordance with the operational status of the ship, The use of the steam drums 5a3 and 5b3 as the steam separators of the steam generators 3a and 3b is switched. The control unit is composed of, for example, a programmable logic controller (PLC), a random access memory (RAM), a read only memory (ROM), and a computer readable storage medium. A series of processes for realizing various functions are stored in a storage medium in the form of a program as an example and various functions are realized by reading out the program from a RAM or the like and executing processing and arithmetic processing of information .

Next, the operation of the array retrieval system 1 having the above-described configuration will be described.

[At anchorage]

At the time of berthing of the ship, the diesel cycle is stopped, and no steam is generated by the exhaust gas economizer (3). However, at the time of anchorage, high-pressure steam is required to drive the cargo oil pump to bring in or out the oil. Therefore, the first auxiliary boiler 5a and the second auxiliary boiler 5b are controlled to operate as a natural-circulation drum boiler by the instruction of the control unit. Concretely, each of the auxiliary boilers 5a and 5b is ignited, and steam is generated by heating the feed water in each of the furnaces 5a1 and 5b1.

Since the capacity of each of the auxiliary boilers 5a and 5b is equal, the high-pressure steam output from each of the steam output pipes 5a9 and 5b9 is led to the cargo oil pump turbine after joining and drives the turbine.

[Sailing]

It is not necessary to generate the high-pressure steam in each of the auxiliary boilers 5a and 5b since the oil is not carried in and out during the navigation of the ship. Therefore, the ignition of each burner of each of the auxiliary boilers 5a, 5b is stopped by the instruction of the control unit.

On the other hand, since the diesel cycle is started at the time of navigation of the ship, it is possible to generate steam by the exhaust gas economizer 3. In this case, the first steam drum 5a2 of the first auxiliary boiler 5a is used as the water separator of the high-pressure steam generator 3a and the second steam generator 5b of the second auxiliary boiler 5b, And switches the steam drum 5b2 to use it as a water separator of the low-pressure steam generator 3b. Specifically, water is supplied from the first water supply pipe 5a4 and the second water supply pipe 5b4 to the first steam drum 5a2 and the second steam drum 5b2, and the first circulation water pump 5a7 And the second circulating water pump 5b7 are started. Thereby, steam is generated in the high-pressure steam generator 3a, and the high-pressure steam at 170 占 폚 and 7 bar is sent to the customer in the ship (oil heating apparatus, etc.) by separating the nose from the first steam drum 5a2. Further, steam is generated in the low-pressure steam generator 3b, the nose is separated in the second steam drum 5b2, and the low-pressure steam having 144 DEG C and 3 bar is sent to a customer in the ship (in-

As described above, according to the present embodiment, the following operational effects are exhibited.

A plurality of auxiliary boilers (5a, 5b) are provided on the ship for securing redundancy and necessary capability. Further, in the present embodiment, since the vessel is an oil tanker, it is necessary to drive the cargo oil pump to carry in or out the oil at the destination. This cargo oil pump has a turbine (cargo oil pump turbine), which is driven by steam. The steam for driving the cargo oil pump turbine is to be supplied by the two auxiliary boilers 5a and 5b since the diesel cycle is stopped during the berth and the steam can not be generated in the exhaust gas economizer 3.

In view of the fact that a plurality of auxiliary boilers 5a and 5b are provided in this embodiment, the use of the second steam drum 5b2 of the second auxiliary boiler 5b as the water separator of the low-pressure steam generator 3b Respectively. As a result, as shown in the reference example of FIG. 2, it is not necessary to separately install the water separator 7 for the low-pressure steam generator 3b, and the cost for installing the water separator 7 separately can be reduced, Saving can be achieved.

In addition, while the auxiliary boilers 5a and 5b are stationary during operation, it is necessary to perform a warm-up operation in which the boiler water is heated by steam in order to reduce the dissolved oxygen in the boiler water and prevent corrosion inside the boiler . Specifically, the boiler water is heated by circulating the steam in the heat transfer pipe formed in the second water drum 5b3 (see the steam pipe 8 shown in Fig. 2). On the other hand, in the present embodiment, since the auxiliary boilers 5a and 5b are used during the running of the exhaust gas economizer 3, the steam for the heating operation for heating the auxiliary boilers 5a and 5b is unnecessarily It is not necessary to generate steam, the required steam amount can be reduced, and the energy efficiency can be improved.

[Second Embodiment]

Next, a second embodiment of the present invention will be described with reference to Figs. 3 and 4. Fig. The present embodiment basically has the same structure as that of the first embodiment, and differs in that several configurations are added. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

As shown in Fig. 3, a pre-circulating water pipe 10 for connecting the first circulating water pipe 5a6 and the second circulating water pipe 5b6 is formed. The water from the second circulating water pipe 5b6 can be led to the first circulating water pipe 5a6 through the preliminary circulating water pipe 10 so as to flow to the high pressure steam generator 3a.

Further, a reserve water mixing pipe 12 for connecting the first water mixing pipe 5a8 and the second water mixing pipe 5b8 is formed. Pressure steam from the first nacreous mixing pipe 5a8 to the second nacreous water mixing pipe 5b8 through the preliminary nacreous water mixing pipe 12 and flow to the second steam drum 5b2.

A pressure reducing valve 14 is formed in the second steam output pipe 5b9. The decompression valve 14 is controlled by the control section so that the steam pressure can be reduced to a predetermined pressure. Further, a branch pipe 16 branched from the upstream side of the pressure reducing valve 14 is formed. The branch pipe (16) supplies steam not decompressed by the pressure reducing valve (14).

Next, the operation of the array retrieval system 1 'according to the present embodiment will be described with reference to Fig.

In the present embodiment, the first auxiliary boiler 5a can appropriately cope with an abnormality such as a failure. That is, when the first auxiliary boiler 5a is stopped by an abnormality, the valve is properly opened and closed by a command from the control unit to stop the water supply to the first auxiliary boiler 5a, The circulating water from the high-pressure steam generator 3a to the high-pressure steam generator 3a is stopped and the supply of the high-pressure steam from the high-pressure steam generator 3a to the first steam drum 5a2 is stopped (see the broken line in FIG. At the same time, the preliminary circulation water pipe 10 and the first circulation water pipe 5a6 and the second circulation water pipe 5b6 are connected by properly opening and closing a valve (not shown) by a command from the control unit, Thereby enabling the circulation water from the drum 5b2 to the high-pressure steam generator 3a (see the bold line in Fig. 4).

A valve (not shown) is appropriately opened and closed by a command from the control unit to connect the reserve water mixing pipe 12 and the first water mixing pipe 5a8 and the second water mixing pipe 5b8 to the high pressure steam generator 3a ) To the second steam drum 5b2. In this way, by switching the piping through which water or steam is circulated by the instruction of the control unit, the first circulation flow path connecting the first steam drum 5a2 and the high-pressure steam generator 3a is made non-circulating, The third circulation flow path using the circulation water pipe 10 and the preliminary pneumatic mixing pipe 12 is brought into a circulation state. Thus, without using the first steam drum 5a2 of the first auxiliary boiler 5a, the second steam 5b2 of the second auxiliary boiler 5b can be used to raise the pressure of the high pressure steam generator 3a A separator can be realized.

The high pressure steam after being separated from the second steam drum 5b2 is led to the steam consumer through the second steam output pipe 5b9. High-pressure steam is introduced through a branch pipe 16 to a customer in need of high-pressure steam such as an oil heating device. On the other hand, in a customer requiring low-pressure steam such as on-board private steam, the low-pressure steam is introduced after the pressure is reduced to a predetermined pressure by the pressure reducing valve 14.

As described above, according to the present embodiment, the following operational effects are exhibited.

Since the third circulation flow passage connected by using the preliminary circulation water pipe 10 and the preliminary water mixture pipe 12 is formed so as to use the second steam drum 5b2 as the water separator of the high-pressure steam generator 3a , And the second steam drum 5b2 may be used as a water separator of the high-pressure steam generator 3a. Thus, even if the first auxiliary boiler 5a fails and the first steam drum 5a2 can not be used, the second steam drum 5b2 can be used instead of the first steam drum 5a2 Therefore, it is possible to continuously carry out array retrieval.

Further, in the present embodiment, when the demand steam amount or the pressure in the ship is insufficient, the burner of the second furnace 5b1 may be ignited and re-burned by the instruction of the control unit.

[Third embodiment]

Next, a third embodiment of the present invention will be described with reference to Fig. The present embodiment basically has the same structure as that of the first embodiment, and differs in that several configurations are added. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

As shown in Fig. 5, a branch pipe 18 is formed in the first steam output pipe 5a9. Further, the branch pipe 18 is provided with a pressure reducing valve 20. The decompression valve 20 is controlled by the control section so that the steam pressure can be reduced to a predetermined pressure.

Next, the operation of the array retrieval system 1 "according to the present embodiment will be described with reference to FIG.

The present embodiment is applied to a case in which the load of the diesel cycle is low, such as 25%, as in low-load navigation. When the diesel cycle is at a low load, the exhaust gas recirculation amount by the exhaust gas economizer 3 is lowered, and it is likely that the demand vapor amount in the ship can not be raised. In this case, the burner of the first furnace 5a1 of the first auxiliary boiler 5a is ignited and re-burned by the command of the control unit. By re-burning in this manner, the amount of steam generated and the pressure are increased, and the high-pressure steam is supplied to the customer in the oil heating apparatus or the like through the first steam output pipe 5a9. When the low-pressure steam is insufficient, the opening degree of the pressure-reducing valve 20 is adjusted by a command from the control unit so that the steam introduced through the branch pipe 18 is converted into a low-pressure steam of a desired pressure, It supplies to the demand of the ship which needs steam.

As described above, according to the present embodiment, the following operational effects are exhibited.

Since the burner of the first furnace 5a1 is re-burned to increase the steam generation amount when the load of the diesel cycle is lowered as in low-load navigation, the amount of steam demanded in the ship can be secured.

In the above-described embodiments, the oil tanker has been described as an example of the ship. However, the present invention is not limited to this, and other types of ships may be used. That is, the present invention can be applied to a ship in which a plurality of auxiliary boilers corresponding to the demanded amount of steam in the ship are formed in order to cope with the case in which the arrangement can not be recovered by the exhaust gas economizer as during the berthing of the ship.

It is also possible to use the above-described embodiments appropriately in combination. Specifically, the preliminary circulation water pipe 10 and the preliminary water mixture pipe 12 shown in Fig. 3 may be formed in the embodiment shown in Fig. 1, or the branch pipe 18 and the pressure reducing valve 20 may be formed.

1, 1 ', 1 ": Array retrieval system
3: Exhaust gas economizer
3a: High-pressure steam generator (first steam generator)
3b: low-pressure steam generator (second steam generator)
5a: First auxiliary boiler
5a1: First burner
5a2: a first steam drum
5a3: first water drum
5a4: First water supply pipe
5a6: first circulating water pipe (first circulating flow path)
5a7: First circulating water pump
5a8: First nose water mixing pipe (first circulation flow path)
5a9: First steam output piping
5b: Secondary boiler
5b1:
5b2: the second steam drum
5b3: the second water drum
5b4: Second water supply piping
5b6: second circulating water pipe (second circulating flow path)
5b7: Second circulating water pump
5b8: Second nose water mixing pipe (second circulation flow path)
5b9: Second steam output piping
10: Preliminary circulation water piping (third circulation flow path)
12: reserve nose mixed piping (third circulation flow path)
14: Pressure reducing valve
16: Branch piping
18: Branch piping
20: Pressure reducing valve

Claims (8)

An exhaust gas economizer in which a first steam generator and a second steam generator are arranged from the upstream side to the downstream side of the exhaust gas flow derived from the ship cycle,
A first drum boiler having a first furnace and a first steam drum,
A second drum boiler having a second furnace and a second steam drum,
A first circulation flow passage connected to use the first steam drum as a water separator of the first steam generator,
And a second circulation flow passage connected to use the second steam drum as a water separator of the second steam generator. The method according to claim 1,
And a control unit for controlling the flow of the first circulation channel and the second circulation channel,
Wherein the control unit sets the first circulation channel and the second circulation channel in a circulation state when the exhaust gas economizer is used and controls the circulation of the first circulation channel and the second circulation channel in a non-circulating state when the exhaust gas economizer is not used State of the array. 3. The method of claim 2,
And a third circulation flow passage connected to use the second steam drum as a water separator of the first steam generator,
Wherein the control unit sets the first circulation channel to the non-circulation state and brings the third circulation channel to the circulation state. 3. The method of claim 2,
Wherein the control unit ignites the first burner formed in the first furnace when the amount of generated steam or pressure obtained from the first steam drum is lowered to a predetermined value or less. The method of claim 3,
Wherein the control unit ignites the first burner formed in the first furnace when the amount of generated steam or pressure obtained from the first steam drum is lowered to a predetermined value or less. 6. The method according to any one of claims 1 to 5,
Wherein the first steam output pipe for outputting steam from the first steam drum and / or the second steam output pipe for outputting steam from the second steam drum is provided with a pressure reducing valve. Ship cycle,
And the arrangement and recovery system according to any one of claims 1 to 5, for arranging and recovering the exhaust gas from exhaust gas from the ship cycle. An exhaust gas recirculation step of exhaust gas recirculation from an upstream side of an exhaust gas flow derived from a ship cycle,
A first water separating step of separating the steam obtained in the first arrangement cycle by the first steam drum of the first drum boiler having the first furnace and the first steam drum,
And a second water separation step of subjecting the steam obtained in the second arrangement number to odd separation by the second steam drum of the second drum boiler having the second furnace and the second steam drum. Way.

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