Fuel cell power generation system

Abstract

To provide a fuel cell power generation system that improves the consumption efficiency of hydrogen contained in a fuel and suppresses carbon dioxide emissions.SOLUTION: A fuel cell power generation system 10 includes a fuel cell 1 that generates electricity using a fuel, a condenser 4 that extracts a mixed gas of hydrogen and carbon dioxide contained in water vapor discharged from the fuel cell 1, a carbon dioxide separation device 5 that separates hydrogen and carbon dioxide from the mixed gas extracted by the condenser 4, a hydrogen supply route that supplies hydrogen separated by the carbon dioxide separation device 5 to the fuel cell 1, and a carbon dioxide liquefaction device 6 that liquefies the carbon dioxide separated by the carbon dioxide separation device 5.SELECTED DRAWING: Figure 1

Description

Technical Field

[0005] , , , , , , to , A vacuum pump that sends a mixed gas containing hydrogen and carbon dioxide from the condenser while maintaining the condenser under vacuum; a separator that removes impurities other than hydrogen and carbon dioxide from the mixed gas supplied from the condenser by the vacuum pump; and the mixed gas from which the impurities have been removed by the separator. , From exhaust gas ,

[0004] , , <00000C2><00000C3><00000C4>The present invention relates to a fuel cell power generation system. <OOOOC5>

Background Art

Summary of the Invention

Problems to be Solved by the Invention

Means for Solving the Problems

Effects of the Invention

[0006] [Figure 1] A diagram showing the configuration of a fuel cell power generation system according to the first embodiment of the present invention. [Figure 2] A diagram showing an example of a configuration for reusing hydrogen contained in water vapor discharged from a fuel cell according to the first embodiment. [Figure 3] A diagram showing an example of the configuration of a carbon dioxide liquefaction apparatus according to the first embodiment. [Figure 4] A diagram showing the configuration of a fuel cell power generation system according to a second embodiment of the present invention. [Figure 5] A diagram showing the configuration of a vessel according to the third embodiment of the present invention. [Figure 6] A schematic diagram showing an overview of the flow of energy and matter in a ship according to the third embodiment. [Modes for carrying out the invention]

[0007] (First embodiment) Figure 1 is a configuration diagram showing the configuration of a fuel cell power generation system 10 according to the first embodiment of the present invention. The same parts in the drawing are denoted by the same reference numerals, and redundant explanations are omitted as appropriate.

[0008] The fuel cell power generation system 10 is not limited to being fixedly installed on land or at sea, but may also be installed on a mobile body such as a ship, vehicle, or aircraft.

[0009] The fuel cell power generation system 10 comprises a fuel cell 1, an LNG tank 2, a steam turbine 3, a condenser 4, a carbon dioxide separator 5, a carbon dioxide liquefaction unit 6, and a carbon dioxide storage tank 7.

[0010] In this explanation, LNG is used as the fuel for fuel cell 1, but LPG (liquefied petroleum gas) may be used and configured in the same way as LNG. In addition, any substance containing hydrogen and carbon atoms may be used as fuel for fuel cell 1. For example, such fuels include alcohols such as ethanol or methanol. Furthermore, ammonia and hydrogen may also be used as fuel.

[0011] Fuel cell 1 is a solid oxide fuel cell (SOFC) that generates electricity using oxygen from the air taken in from the atmosphere and hydrogen contained in natural gas vaporized from LNG supplied from LNG tank 2. While fuel cell 1 is described here as a solid oxide type, other types of fuel cells may also be used.

[0012] Fuel cell 1 supplies the generated electricity to the load (power equipment). The steam containing carbon dioxide and hydrogen emitted from fuel cell 1 is sent to steam turbine 3. The hydrogen contained in the steam is the gas supplied to fuel cell 1 that has been reformed within fuel cell 1 and is the hydrogen that was emitted without reacting in fuel cell 1.

[0013] LNG tank 2 is a facility for storing LNG. LNG tank 2 supplies vaporized LNG gas to fuel cell 1 according to the amount of electricity demanded. Note that LNG tank 2 can be any facility capable of storing LNG. Furthermore, when the fuel cell power generation system 10 is applied to a ship, LNG tank 2 may be an LNG tank for transporting LNG, or a fuel tank for storing LNG as fuel for the power source. In addition, there may be any number of LNG tanks 2, and they do not have to be part of the configuration of the fuel cell power generation system 10. Furthermore, a gas compressor may be provided to supply LNG gas from the LNG tank.

[0014] The steam turbine 3 generates electricity using the steam exhausted from the fuel cell 1. The electricity generated by the steam turbine 3 can be used in any way. For example, the steam turbine 3 may supply the generated electricity to a load (power equipment) together with the electricity generated by the fuel cell 1. Alternatively, the steam exhausted from the fuel cell 1 may be directly fed into the condenser 4 without the steam turbine 3.

[0015] The condenser 4 is connected to the steam turbine 3. The condenser 4 converts the steam sent from the fuel cell 1 via the steam turbine 3 back into water and extracts the hydrogen and carbon dioxide contained in the steam. In this way, the mixed gas containing hydrogen and carbon dioxide extracted from the condenser 4 is sent to the carbon dioxide separator 5.

[0016] For example, a compressor C1 is provided in the path (e.g., pipeline) that sends the mixed gas from the condenser 4 to the carbon dioxide separator 5. The compressor C1 compresses the mixed gas and sends it to the carbon dioxide separator 5. The water extracted from the condenser 4 may be reused or discarded. If the condenser 4 is to be drained to the outside, a condensate pump may be provided for drainage.

[0017] The carbon capture system (CCS) 5 physically separates the hydrogen and carbon dioxide mixture fed from the condenser 4 into carbon dioxide gas and hydrogen gas. For example, the carbon capture system 5 separates the mixed gas using pressure swing adsorption (PSA), but any method may be used to separate the mixed gas. After separating the mixed gas, the carbon capture system 5 supplies the hydrogen gas to the fuel cell 1 and sends the carbon dioxide gas to the carbon dioxide liquefaction unit 6.

[0018] For example, the carbon dioxide separation device 5 feeds the separated hydrogen gas into a path (e.g., a pipeline) that sends it from the LNG tank 2 to the fuel cell 1. In this way, by supplying hydrogen from the carbon dioxide separation device 5 to the fuel cell 1, the hydrogen discharged without reacting in the fuel cell 1 is reused. Note that a compressor for compressing the hydrogen gas may be provided in the path (e.g., a pipeline) for sending the hydrogen gas from the carbon dioxide separation device 5 to the fuel cell 1.

[0019] The carbon dioxide liquefaction device 6 cools the carbon dioxide gas sent from the carbon dioxide separation device 5 to liquefy the carbon dioxide. The carbon dioxide liquefaction device 6 stores the liquefied carbon dioxide in the carbon dioxide storage tank 7. Note that the carbon dioxide liquefaction device 6 may be configured in any way as long as it can liquefy the carbon dioxide gas.

[0020] The carbon dioxide stored in the carbon dioxide storage tank 7 can be freely disposed of at any location. For example, the carbon dioxide may be buried and disposed of underground or in the sea, or may be processed by a device or the like, or may be used for applications that require carbon dioxide as a resource. Note that the carbon dioxide liquefied by the carbon dioxide liquefaction device 6 may be directly disposed of without providing the carbon dioxide storage tank 7.

[0021] FIG. 2 is a configuration diagram showing an example of a configuration for reusing hydrogen contained in the water vapor discharged from the fuel cell 1 according to the present embodiment. Note that the configuration is not limited to that described here and may be configured in any way.

[0022] A vacuum pump P1 and a separator SP are provided in a path (e.g., a pipeline) for supplying a mixed gas containing hydrogen and carbon dioxide from the condenser 4 to the carbon dioxide separation device 5.

[0023] The vacuum pump P1 is supplied with a mixed gas containing hydrogen and carbon dioxide from the condenser 4. The vacuum pump P1 sends the mixed gas containing hydrogen and carbon dioxide supplied from the condenser 4 to the separator SP while keeping the condenser 4 under vacuum.

[0024] The separator SP removes impurities other than hydrogen gas and carbon dioxide gas (e.g., water) from the mixed gas supplied from the vacuum pump P1. The separator SP supplies the mixed gas containing the extracted hydrogen and carbon dioxide to the carbon dioxide separator 5. The carbon dioxide separator 5 separates the mixed gas into hydrogen gas and carbon dioxide gas. The separated hydrogen gas is reused in the fuel cell 1. The separated carbon dioxide gas is stored in the carbon dioxide storage tank 7 via the carbon dioxide liquefaction device 6.

[0025] Alternatively, the mixed gas discharged from the condenser 4 may be sent directly to the carbon dioxide separator 5 without the vacuum pump P1 and separator SP.

[0026] Figure 3 is a diagram showing an example of the configuration of the carbon dioxide liquefaction apparatus 6 according to this embodiment. Note that the configuration of the carbon dioxide liquefaction apparatus 6 described here is just one example, and any configuration is acceptable as long as carbon dioxide gas can be liquefied.

[0027] The carbon dioxide liquefaction device 6 comprises a carbon dioxide compressor 61, a dehumidifier 62, a first heat exchanger 63, a carbon dioxide liquefaction device 64, a refrigerator 65, a refrigerant condenser 66, and a second heat exchanger 67.

[0028] The carbon dioxide compressor 61 takes in the carbon dioxide gas separated by the carbon dioxide separator 5 and compresses it. The carbon dioxide compressor 61 sends the compressed carbon dioxide gas to the dehumidifier 62. In addition to the carbon dioxide gas from the carbon dioxide separator 5, the carbon dioxide compressor 61 may also take in the carbon dioxide that has vaporized inside the carbon dioxide storage tank 7 and compress it together.

[0029] The dehumidifier 62 dries the carbon dioxide gas supplied from the carbon dioxide compressor 61. This removes the purge gas from the carbon dioxide gas. The dehumidifier 62 then sends the dried carbon dioxide gas to the first heat exchanger 63. Note that the dehumidifier 62 is optional.

[0030] The first heat exchanger 63 cools the carbon dioxide gas supplied from the dehumidifier 62 with fresh water. The first heat exchanger 63 then sends the cooled carbon dioxide gas to the carbon dioxide liquefaction unit 64. When the fuel cell power generation system 10 is installed on a ship, water (such as seawater) pumped from outside the ship using an intake pump or the like may be used instead of fresh water.

[0031] The carbon dioxide liquefier 64 cools and liquefies the carbon dioxide gas supplied from the first heat exchanger 63. This removes the non-condensable gas from the carbon dioxide. The carbon dioxide liquefier 64 then sends the liquefied carbon dioxide to the second heat exchanger 67.

[0032] The carbon dioxide liquefier 64 cools the carbon dioxide gas with a refrigerant. The refrigerant used to cool the carbon dioxide gas is sent to the refrigerator 65 where it is further cooled. The refrigerant cooled in the refrigerator 65 is sent to the refrigerant condenser 66 where it is compressed. The refrigerant compressed in the refrigerant condenser 66 is supplied to the carbon dioxide liquefier 64 and used to cool the carbon dioxide gas.

[0033] The second heat exchanger 67 cools the liquefied carbon dioxide supplied from the carbon dioxide liquefier 64 using BOG (boil-off gas). BOG is gaseous natural gas generated when a portion of the LNG stored in the LNG tank 2 vaporizes due to heat input. The second heat exchanger 67 cools the liquefied carbon dioxide and sends it to the carbon dioxide storage tank 7. For example, the BOG that has been used for cooling and heated is supplied to the fuel cell 1 as fuel.

[0034] According to this embodiment, by providing a condenser 4 and a carbon dioxide separator 5, hydrogen and carbon dioxide contained in the steam emitted from the fuel cell 1 can be extracted separately. By supplying the extracted hydrogen to the fuel cell 1, the efficiency of hydrogen consumption in LNG can be improved. By extracting carbon dioxide from the steam emitted from the fuel cell 1, the amount of carbon dioxide emitted from the fuel cell 1 can be controlled. As a result, the fuel cell power generation system 10 can avoid emitting carbon dioxide into the atmosphere.

[0035] By installing a steam turbine 3 in the path through which steam is discharged from the fuel cell 1 to the condenser 4, electricity can be generated using the steam discharged from the fuel cell 1.

[0036] In the carbon dioxide liquefaction device 6, the energy efficiency of the fuel cell power generation system 10 can be improved by using BOG to cool the carbon dioxide and supplying the BOG used for cooling to the fuel cell 1.

[0037] (Second embodiment) Figure 4 is a configuration diagram showing the configuration of a fuel cell power generation system 10A according to a second embodiment of the present invention.

[0038] The fuel cell power generation system 10A is the same as the fuel cell power generation system 10 according to the first embodiment shown in Figure 1, with the addition of a first heat exchanger 8 and a second heat exchanger 9. Other aspects are the same as those of the first embodiment.

[0039] The first heat exchanger 8 performs heat exchange so that the gas supplied as fuel to the fuel cell 1 is heated by the steam discharged from the fuel cell 1. As a result, the gas supplied to the fuel cell 1 is heated and the steam discharged from the fuel cell 1 is cooled. The gas heated by the first heat exchanger 8 is supplied to the fuel cell 1. The steam cooled by the first heat exchanger 8 is sent to the second heat exchanger 9. The gas that is the fuel heated by the first heat exchanger 8 may or may not contain hydrogen gas supplied from the carbon dioxide separator 5.

[0040] The second heat exchanger 9 performs heat exchange so that the air (oxygen) taken in from the atmosphere to be supplied to the fuel cell 1 is heated by the steam sent in from the first heat exchanger 8. As a result, the air supplied to the fuel cell 1 is heated and the steam discharged from the fuel cell 1 is cooled. The air heated by the second heat exchanger 9 is supplied to the fuel cell 1. The steam cooled by the second heat exchanger 9 is sent to the condenser 4 via the steam turbine 3.

[0041] In this way, the steam discharged from the fuel cell 1 is cooled by the first heat exchanger 8 and the second heat exchanger 9. Meanwhile, the gas (hydrogen-containing gas) and air (oxygen) supplied to the fuel cell 1 are heated by the first heat exchanger 8 and the second heat exchanger 9.

[0042] Furthermore, the first heat exchanger 8 and the second heat exchanger 9 may be arranged interchangeably. Specifically, they may be arranged so that the steam discharged from the fuel cell 1 is first cooled by the second heat exchanger 9 and then by the first heat exchanger 8. Alternatively, only one of the first heat exchanger 8 or the second heat exchanger 9 may be provided.

[0043] According to this embodiment, in addition to the effects of the first embodiment, the overall energy efficiency of the fuel cell power generation system 10A can be improved.

[0044] (Third embodiment) Figure 5 is a configuration diagram showing the configuration of a vessel 20 according to the third embodiment of the present invention. Figure 6 is a schematic diagram showing an overview of the flow of energy and matter in the vessel 20 according to this embodiment.

[0045] The vessel 20 is a vessel equipped with the fuel cell power generation system 10 according to the first embodiment shown in Figure 1. Other aspects are the same as in the first embodiment.

[0046] Ship 20 is a vessel that generates electricity using LNG stored on board as fuel. Ship 20 can be any vessel as long as it is equipped with facilities for storing LNG. For example, Ship 20 may be an LNG carrier intended for transporting LNG, a vessel that uses LNG as a power source and is intended for transporting goods other than LNG, or a vessel that is not intended for transporting goods.

[0047] The vessel 20 is equipped with a fuel cell 1, multiple LNG tanks 2, a steam turbine 3, a condenser 4, a carbon dioxide separator 5, a carbon dioxide liquefaction unit 6, a carbon dioxide storage tank 7, multiple solar cells 11, storage batteries 12, a switchboard 13, a propulsion motor 14, and a propeller 15. The installation locations of the equipment etc. described below are examples and may be placed in appropriate locations inside or outside the vessel.

[0048] The fuel cell 1 supplies the generated electricity to the propulsion motor 14 via the switchboard 13. The fuel cell 1 may also supply the generated electricity to other electrical equipment on board the ship besides the propulsion motor 14. For example, the fuel cell 1 may be installed on the deck of the ship's hull, or it may be installed inside a building to protect it from external factors such as salt damage.

[0049] In the case of an LNG carrier, LNG tank 2 is located inside the hull. While LNG tank 2 is primarily a storage tank for transporting LNG, it may also function as a fuel tank for storing LNG as a power source. At least one LNG tank 2 is sufficient.

[0050] For example, the ship 20 is configured as follows: The steam turbine 3 and condenser 4 are located inside the hull. The carbon dioxide separator 5, carbon dioxide liquefaction unit 6, and carbon dioxide storage tank 7 are located on the deck of the hull. A compressor C1 and a vacuum pump P1 are provided in the path that sends the mixed gas from the condenser 4 to the carbon dioxide separator 5. In addition, any other equipment such as compressors or pumps may be provided in this path.

[0051] Specifically, the carbon dioxide separator 5 and carbon dioxide liquefaction unit 6 are installed inside building BD, which is located on the deck of the ship's hull. The carbon dioxide storage tank 7 is located outside building BD, near building BD. Building BD protects the equipment installed inside the carbon dioxide separator 5 and carbon dioxide liquefaction unit 6 from external factors such as salt damage. By installing the carbon dioxide separator 5, carbon dioxide liquefaction unit 6, and carbon dioxide storage tank 7 close to each other, the route for supplying carbon dioxide connecting them can be shortened.

[0052] The carbon dioxide storage tank 7 is preferably installed in a location where the stored carbon dioxide can be easily unloaded. The carbon dioxide storage tank 7 may be detachably installed from the ship 20, or it may be configured to be connected to a transport pump P2 to send liquefied carbon dioxide outside the ship, or it may have both. In addition, the carbon dioxide storage tank 7 may be equipped with a cargo handling pump separate from the transport pump to extract the carbon dioxide stored in the carbon dioxide storage tank 7. In this way, the carbon dioxide stored in the carbon dioxide storage tank 7 can be transported to land.

[0053] The solar cell 11 is a battery that converts sunlight into electrical energy. The solar cell 11 is installed on the surface of the ship 20 in a place where sunlight shines on it (for example, the deck). The solar cell 11 supplies the generated electricity to the propulsion motor 14 via the switchboard 13. The solar cell 11 may also supply the generated electricity to other electrical equipment on board the ship besides the propulsion motor 14. Note that the solar cell 11 does not necessarily have to be installed on the ship 20.

[0054] The battery 12 is connected to the distribution panel 13. If the power demanded by the propulsion motor 14, etc., is greater than the power supplied by the fuel cell 1 and solar cell 11, the battery 12 supplements the power supply with its stored electrical energy. On the other hand, if the power demand is less than the power supplied by the fuel cell 1 and solar cell 11, the battery 12 is charged. In this way, the battery 12 charges and discharges to balance the power demand and the power supply. Note that the battery 12 does not necessarily have to be installed on the ship 20.

[0055] Furthermore, the fuel cell 1 and the solar cell 11 may each be equipped with a control unit for controlling their own operation and a power converter for converting output power into desired power. Similarly, the storage battery 12 may be equipped with a control unit for controlling its own operation (charging or discharging, etc.) and a power converter for converting charge / discharge power into desired power.

[0056] The switchboard 13 is a device for supplying power from the fuel cell 1, solar cell 11, and storage battery 12 to the propulsion motor 14, etc. When the storage battery 12 is charging, the switchboard 13 supplies electrical energy from the fuel cell 1 and solar cell 11 to the storage battery 12. The switchboard 13 may also be supplied with power generated by the steam turbine 3. In addition, there may be any number of switchboards 13, or the switchboard 13 may be omitted and replaced with switches, etc.

[0057] The propulsion motor 14 is a power source for obtaining thrust from the ship 20. For example, the propulsion motor 14 is a DC motor. Since the propulsion motor 14 is driven by DC power supplied from the fuel cell 1, solar cell 11, and storage battery 12, the use of a DC motor reduces the number of power conversion circuits such as inverters, thereby improving the overall energy efficiency of the ship 20. Alternatively, the propulsion motor 14 may be an AC motor.

[0058] The propulsion device 15 is connected to the propulsion motor 14 and is a device that converts the rotational force of the propulsion motor 14 into propulsion force for the ship 20.

[0059] Referring to Figure 6, the flow of energy and matter in the ship 20 will be explained. Natural gas, which is vaporized LNG, is supplied from LNG tank 2 to fuel cell 1. As fuel cell 1 performs power generation (chemical reaction), water vapor containing hydrogen and carbon dioxide is discharged from fuel cell 1. Condenser 4 removes water from the water vapor supplied from fuel cell 1 and extracts a mixed gas of hydrogen and carbon dioxide. Carbon dioxide separator 5 separates the mixed gas into hydrogen gas and carbon dioxide gas.

[0060] The hydrogen gas separated by the carbon dioxide separation device 5 is reused by being supplied to the fuel cell 1. The carbon dioxide gas separated by the carbon dioxide separation device 5 is liquefied by the carbon dioxide liquefaction device 6 and stored in the carbon dioxide storage tank 7. The carbon dioxide stored in the carbon dioxide storage tank 7 is unloaded and then disposed of.

[0061] The electricity generated by the fuel cell 1 and the solar cell 11 is supplied to the propulsion motor 14 via the switchboard 13. The storage battery 12 charges and discharges to balance the power supplied by the fuel cell 1 and the solar cell 11 with the power consumed by the propulsion motor 14 and other components. The propulsion force of the ship 20 is obtained by driving the propulsion motor 14 with the supplied electricity.

[0062] According to this embodiment, by implementing the fuel cell power generation system 10 according to the first embodiment on a ship 20, the same effects and advantages as in the first embodiment can be obtained on the ship 20. That is, carbon dioxide emissions from the ship 20 can be managed, and the energy efficiency using LNG, which is the fuel for the ship 20, can be improved.

[0063] Furthermore, the ship 20 may be equipped with the fuel cell power generation system 10A according to the second embodiment. This will further improve the overall energy efficiency of the ship 20 compared to when the fuel cell power generation system 10 according to the first embodiment is equipped on the ship 20.

[0064] Furthermore, additional advantages and modifications may readily arise for those skilled in the art. Therefore, the present invention in its broader aspects is not limited to the specific detailed and representative embodiments described herein. Accordingly, various modifications can be made without departing from the spirit or scope of the general concept of the invention as defined by the appended claims and their equivalents. [Explanation of symbols]

[0065] 1…Fuel cell, 2…LNG tank, 3…Steam turbine, 4…Condenser, 5…Carbon dioxide separator, 6…Carbon dioxide liquefaction unit, 7…Carbon dioxide storage tank, 10…Fuel cell power generation system.

Claims

1. Fuel cells that generate electricity using fuel, A condenser that removes water vapor from the exhaust gas discharged from the fuel cell by converting it to water, A vacuum pump that sends a mixed gas containing hydrogen and carbon dioxide from the condenser while maintaining the condenser under vacuum, A separator that removes impurities other than hydrogen and carbon dioxide from the mixed gas supplied from the condenser by the vacuum pump, A component separation means for separating the mixed gas from which the impurities have been removed by the separator into hydrogen and carbon dioxide, A hydrogen supply path for supplying the hydrogen separated by the component separation means to the fuel cell, A carbon dioxide liquefaction means for liquefying the carbon dioxide separated by the component separation means, A fuel cell power generation system characterized by being equipped with the following features.

2. The system includes a steam turbine that generates electricity using the steam discharged from the fuel cell, The condenser is supplied with the exhaust gas discharged from the fuel cell via the steam turbine. A fuel cell power generation system according to claim 1, characterized by the following:

3. A heat exchanger that heats the fuel gas and cools the exhaust gas discharged from the fuel cell. The fuel cell power generation system according to claim 1, characterized by comprising:

4. A heat exchanger that heats the air supplied to the fuel cell and cools the exhaust gas discharged from the fuel cell. The fuel cell power generation system according to claim 1, characterized by comprising:

5. Carbon dioxide storage means for storing the carbon dioxide liquefied by the carbon dioxide liquefaction means. The fuel cell power generation system according to claim 1, characterized by comprising the above.

6. The hull and, A fuel storage tank for storing fuel, A fuel cell, which is installed in the hull and generates electricity using the fuel stored in the fuel storage tank, A condenser that removes water vapor from the exhaust gas discharged from the fuel cell by converting it to water, A vacuum pump that sends a mixed gas containing hydrogen and carbon dioxide from the condenser while maintaining the condenser under vacuum, A separator that removes impurities other than hydrogen and carbon dioxide from the mixed gas supplied from the condenser by the vacuum pump, A component separation means for separating the mixed gas from which the impurities have been removed by the separator into hydrogen and carbon dioxide, A hydrogen supply path for supplying the hydrogen separated by the component separation means to the fuel cell, A carbon dioxide liquefaction means for liquefying the carbon dioxide separated by the component separation means, A carbon dioxide storage tank for storing the carbon dioxide liquefied by the carbon dioxide liquefaction means, A ship characterized by being equipped with the following features.

7. A propulsion system powered by electricity generated by the aforementioned fuel cell. The ship according to claim 6, characterized by comprising:

8. A heat exchanger that heats the fuel gas and cools the exhaust gas discharged from the fuel cell. The ship according to claim 6, characterized by comprising:

9. A heat exchanger that heats the air supplied to the fuel cell and cools the exhaust gas discharged from the fuel cell. The ship according to claim 6, characterized by comprising:

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