Fuel Cell Systems

Abstract

To provide a technique to more efficiently operate a fuel cell system that generates a fuel gas by vaporizing and reforming liquid fuel and removes impurities from the generated fuel gas.SOLUTION: A fuel cell system comprises: a vaporizer that vaporizes liquid fuel through heat exchange with water reserved in a water tank; a reformer that reforms gaseous fuel vaporized by the vaporizer to generate a fuel gas; a remover that removes impurities included in the fuel gas generated by the reformer by using the water reserved in the water tank; and a fuel cell that generates power by using the fuel gas generated by the reformer and air. The reformer has a reforming unit that reforms the gaseous fuel, and a burning unit that burns the gaseous fuel to heat the reforming unit. The fuel cell system is configured such that a combustion gas exhausted from the burning unit is supplied to a water tank of the vaporizer and / or a water tank of the remover.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a fuel cell system. [Background technology]

[0002] Patent Document 1 discloses a fuel cell system including a reformer that reforms a raw material gas containing hydrocarbons to produce a hydrogen-containing gas (fuel gas), and a fuel cell that generates power using the fuel gas and air. The reformer in Patent Document 1 has a reforming section to which the raw material gas is supplied, and a combustion section for heating the reforming section. The combustion section is supplied with exhaust gas (hydrogen) discharged from the fuel cell and air (oxygen) used to cool the fuel cell. This causes catalytic combustion in the combustion section, heating the reforming section. The combustion gas generated in the combustion section of the reformer is discharged to the outside via an exhaust gas line.

[0003] Patent Document 2 discloses a fuel cell system including a vaporizer that vaporizes liquid ammonia, a reformer that reforms the vaporized ammonia to generate fuel gas, and a fuel cell that generates power from the fuel gas and air. In Patent Document 2, exhaust gas discharged from the fuel cell is heated and supplied to the vaporizer, and the liquid ammonia is vaporized by the heat of the exhaust gas.

[0004] Patent Document 3 discloses a fuel cell system including a reformer that reforms a raw material gas containing a hydrocarbon to produce a hydrogen-containing gas, a remover that removes ammonia from the hydrogen-containing gas, and a fuel cell that generates power using the hydrogen-containing gas from which the ammonia has been removed and air. In Patent Document 3, in order to reduce poisoning of a catalyst inside the fuel cell, the hydrogen-containing gas is brought into contact with water in the remover, thereby dissolving the ammonia in the water and removing ammonia (i.e., an impurity) from the hydrogen-containing gas. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-290901 A [Patent Document 2] JP 2016-134278 A [Patent Document 3] International Publication No. 2011 / 111400 Summary of the Invention [Problem to be solved by the invention]

[0006] This specification provides a technology that enables more efficient operation of a fuel cell system that generates fuel gas by vaporizing and reforming a liquid fuel and removes impurities from the generated fuel gas. [Means for solving the problem]

[0007] The fuel cell system disclosed in this specification includes a vaporizer that vaporizes liquid fuel by heat exchange with water stored in a water tank, a reformer that generates fuel gas by reforming the gas fuel vaporized by the vaporizer, a remover that removes impurities contained in the fuel gas generated by the reformer using water stored in a water tank, and a fuel cell that generates power using the fuel gas generated by the reformer and air. The reformer has a reforming section that reforms the gas fuel, and a combustion section that heats the reforming section by combusting the gas fuel. The combustion gas discharged from the combustion section is configured to be supplied to the water tank of the vaporizer and / or the water tank of the remover.

[0008] In the above fuel system, the combustion gas discharged from the combustion unit is supplied to the water tank of the vaporizer and / or the water tank of the remover. The combustion gas generated by burning the gaseous fuel contains moisture produced by the combustion. Therefore, by supplying the combustion gas to the water tank of the vaporizer, the frequency of refilling the water tank of the vaporizer with water can be reduced. In addition, by supplying the combustion gas to the water tank of the remover, the frequency of refilling the water tank of the remover with water can be reduced. In addition, since the combustion gas discharged from the combustion unit is relatively hot, when the combustion gas is supplied to the water tank of the vaporizer, the water temperature required for vaporizing the liquid fuel can be maintained, and the energy required to heat the water by a heater or the like can be reduced. As described above, in the above fuel cell system, the combustion gas discharged from the combustion unit can be effectively used, and the system can be operated efficiently.

[0009] The exhaust gas discharged from the fuel cell may be configured to be supplied to the combustion section. The exhaust gas discharged from the fuel cell may contain hydrogen and oxygen that remain unconsumed (unreacted) in the fuel cell. In the above configuration, the unreacted hydrogen and oxygen contained in the exhaust gas can be utilized in the combustion section, so that the amount of gaseous fuel to be combusted in the combustion section can be reduced, and the amount of oxygen to be supplied to the combustion section can be reduced.

[0010] The fuel cell may be configured so that moisture contained in the exhaust gas discharged from the fuel cell is removed before the exhaust gas is supplied to the combustion section. In this configuration, the combustion section does not require energy to heat the water, so that the reforming section can be heated efficiently.

[0011] The water removed from the exhaust gas discharged from the fuel cell may be supplied to the water tank of the vaporizer and / or the water tank of the remover. In this configuration, the frequency of replenishing the water tank of the vaporizer and the water tank of the remover can be further reduced.

[0012] The water tank of the vaporizer and the water tank of the remover may share water. In such a configuration, the water used for vaporizing the liquid fuel and the water used for removing impurities are shared by the vaporizer and the remover. Therefore, when a relatively high-temperature fuel gas is introduced into the remover, impurities can be removed from the fuel gas and the water stored in the water tank can be raised in temperature. The water temperature of the vaporizer is raised by the fuel gas and the combustion gas, so that the system can be operated more efficiently.

[0013] The water tank of the vaporizer and the water tank of the remover may be integrated together, which simplifies the system configuration since a single water tank serves both the vaporizer and the remover.

[0014] The water tank of the vaporizer and the water tank of the remover may be separate and in communication with each other. The combustion gas discharged from the combustion section may be configured to pass through the water stored in the water tank of the remover after heat exchange with the water stored in the water tank of the vaporizer. In this configuration, the combustion gas is first introduced into the water tank for vaporizing the liquid fuel. That is, the water temperature of the water tank of the vaporizer can be efficiently increased.

[0015] The system may further include a neutralizer that neutralizes the water stored in the tank of the remover. Impurities dissolve in the tank of the remover. This causes the pH of the water in the tank to fluctuate. In the above configuration, by including a neutralizer that neutralizes the water in the tank, corrosion of the system and unpleasant odors in the water can be suppressed. The neutralizer may neutralize the water by, for example, a neutralization reaction with an acid or a base, or by using the buffering action of a buffer solution.

[0016] The system may further include a heat exchanger that heats the gaseous fuel vaporized by the vaporizer by heat exchange with the combustion gas discharged from the combustion section. In this configuration, the vaporized gaseous fuel can be heated in advance before being introduced into the reformer. In addition, since the combustion gas is cooled, the water stored in the water tank can be prevented from being excessively heated. [Brief description of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing the configuration of a fuel cell system according to a first embodiment. [Diagram 2] FIG. 5 is a schematic diagram showing the configuration of a fuel cell system according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Example 1 Hereinafter, a fuel cell system (hereinafter, sometimes simply referred to as a system) 1 of Example 1 will be described with reference to the drawings. As shown in Fig. 1, the system 1 includes a liquid fuel tank 4, a pump 6, a vaporizer 12, a heat exchanger 14, a reformer 16, a fuel cell 20, a remover 22, a hydrogen permeable membrane 24, and a water separator 42.

[0019] The liquid fuel tank 4 stores the liquid fuel 5. In this embodiment, liquid ammonia (an example of a liquid fuel) is used as the liquid fuel 5. The liquid fuel tank 4 stores the liquid ammonia, for example, at room temperature (20 to 25°C) and at several atmospheres (8 to 10 atmospheres). Since the liquid fuel tank 4 stores ammonia in a liquid state, the storage efficiency of ammonia is high.

[0020] The pump 6 is disposed in a liquid ammonia supply pipe 30 that connects between the liquid fuel tank 4 and the vaporizer 12. The pump 6 sends out the liquid ammonia stored in the liquid fuel tank 4 toward the vaporizer 12.

[0021] The vaporizer 12 is connected to the liquid ammonia supply pipe 30. The vaporizer 12 vaporizes the liquid ammonia flowing in from the liquid ammonia supply pipe 30 and sends it to the gaseous ammonia supply pipe 32. The vaporizer 12 has a water tank 12a and an evaporator 12b. Water 60 is stored in the water tank 12a. The temperature of the water 60 stored in the water tank 12a is about 70°C. As will be described later, in this embodiment, the water tank 12a of the vaporizer 12 and the water tank 22a of the remover 22 are integrated. That is, the water tank 12a and the water tank 22a share water. The liquid ammonia that flows into the vaporizer 12 is vaporized by heat exchange with the water 60 in the water tank 12a in the process of passing through the evaporator 12b, and is sent to the gaseous ammonia supply pipe 32.

[0022] The heat exchanger 14 is disposed in a gaseous ammonia supply pipe 32 that connects between the vaporizer 12 and the reformer 16. The heat exchanger 14 is provided to preheat the gaseous ammonia to be introduced into the reformer 16. The gaseous ammonia is heated to about 350 to 400°C by heat exchange with the fuel gas and combustion gas (described later) delivered from the reformer 16. The heated gaseous ammonia is delivered to the reformer 16.

[0023] The reformer 16 is connected to the gaseous ammonia supply pipe 32. The reformer 16 generates a fuel gas containing hydrogen by reforming the gaseous ammonia. The reformer 16 is an auto-thermal type reformer. The reformer 16 has a reforming section 16a that reforms the gaseous ammonia and a combustion section 16b that heats the reforming section 16a by burning the gaseous ammonia. The gaseous ammonia flowing through the gaseous ammonia supply pipe 32 is branched into a first introduction pipe 32a and a second introduction pipe 32b, and is introduced into the reforming section 16a and the combustion section 16b, respectively. The amount of gaseous ammonia introduced into the reforming section 16a and the combustion section 16b is appropriately adjusted, for example, by an opening / closing valve (not shown) provided in each of the first introduction pipe 32a and the second introduction pipe 32b.

[0024] The combustion section 16b generates heat by oxidizing the gaseous ammonia introduced from the second introduction pipe 32b with air supplied from an air supply pipe (not shown). The reforming section 16a reforms the gaseous ammonia with the heat generated in the combustion section 16b, and decomposes the gaseous ammonia into hydrogen and nitrogen. The reforming section 16a generates a fuel gas heated to about 900°C. The generated fuel gas is sent to the fuel gas flow pipe 34 through the first delivery pipe 34a. In addition, the combustion section 16b oxidizes the gaseous ammonia to generate a combustion gas mainly containing nitrogen and moisture. The combustion gas generated in the combustion section 16b is sent to the fuel gas flow pipe 34 through the second delivery pipe 34b. That is, a mixed gas of the fuel gas reformed in the reforming section 16a and the combustion gas generated by the oxidation of the gaseous ammonia in the combustion section 16b flows in the fuel gas flow pipe 34.

[0025] The mixed gas of the fuel gas and the combustion gas is introduced into the heat exchanger 14 through the fuel gas flow pipe 34. The mixed gas is cooled in the heat exchanger 14 by heat exchange with the gaseous ammonia vaporized by the vaporizer 12. The cooled mixed gas is introduced into the remover 22 through the fuel gas flow pipe 34.

[0026] The fuel gas generated in the reforming section 16a may contain residual ammonia (an example of an impurity) that has not been reformed (decomposed) in the reforming section 16a and remains there. The remover 22 removes the residual ammonia contained in the fuel gas (mixed gas) from the fuel gas by dissolving it in water. The remover 22 has a water tank 22a in which water 60 is stored. In this embodiment, the water tank 22a of the remover 22 and the water tank 12a of the vaporizer 12 are integrally configured. That is, the water 60 used to vaporize the liquid ammonia is also used as the water 60 for removing the residual ammonia. The fuel gas circulation pipe 34 extends into the water 60 in the water tank 22a, and the mixed gas flowing through the fuel gas circulation pipe 34 flows out from a plurality of exhaust holes 34c provided at the tip portion of the fuel gas circulation pipe 34 into the water 60 in the water tank 22a. Here, the moisture contained in the combustion gas is used as the water 60 in the water tank 22a. Furthermore, residual ammonia contained in the fuel gas is removed from the fuel gas by dissolving it in water 60. Most of the mixed gas from which the residual ammonia has been removed is introduced into separation tube .

[0027] The hydrogen permeable membrane 24 is connected to the remover 22 via a separation tube 38. The hydrogen permeable membrane 24 adsorbs components other than hydrogen from the gas contained in the mixed gas. The components other than hydrogen may include nitrogen and nitrogen oxides. When the mixed gas passes through the hydrogen permeable membrane 24, the components other than hydrogen are adsorbed by the hydrogen permeable membrane 24, and only hydrogen permeates the hydrogen permeable membrane 24. The hydrogen that permeates the hydrogen permeable membrane 24 is sent to a hydrogen supply pipe 40. The hydrogen supply pipe 40 is connected to the anode 20a of the fuel cell 20, and the hydrogen is supplied to the anode 20a as fuel gas.

[0028] The fuel cell 20 is, for example, a solid oxide fuel cell (SOFC). The fuel cell 20 has a stack structure in which a plurality of cells are stacked. Each cell has an anode 20a, a cathode 20b, and an electrolyte layer (not shown) disposed between the anode 20a and the cathode 20b. The anode 20a is connected to a hydrogen supply pipe 40. Hydrogen (fuel gas) that has passed through a hydrogen permeable membrane 24 is supplied to the anode 20a. The cathode 20b is connected to an air blower 26 via an air supply pipe 35. Air is supplied from the atmosphere to the cathode 20b by the air blower 26. The fuel cell 20 generates power using the fuel gas supplied from the hydrogen supply pipe 40 and the air supplied from the air supply pipe 35.

[0029] When the fuel cell 20 generates power, it discharges exhaust gas containing unreacted hydrogen and oxygen together with water (discharge water) generated by a chemical reaction between hydrogen in the fuel gas and oxygen in the air. The temperature of the exhaust gas at this time is about 700°C. The mixture of the exhaust gas and the discharge water is introduced into the moisture separator 42 through the exhaust gas circulation pipe 36. The moisture separator 42 removes moisture from the mixture flowing through the exhaust gas circulation pipe 36. That is, the discharge water is removed from the mixture by the moisture separator 42. The configuration of the moisture separator 42 is not particularly limited. For example, the discharge water can be removed from the mixture of the exhaust gas and the discharge water by a cooled air dryer or the like. The removed moisture is supplied into the water tanks 12a, 22a of the vaporizer 12 and the remover 22, as shown by the arrow 44.

[0030] The exhaust gas flow pipe 36 is connected to the combustion section 16b of the reformer 16. The exhaust gas from which moisture has been removed is introduced into the combustion section 16b through the exhaust gas flow pipe 36. Hydrogen contained in the exhaust gas is used as fuel for heating the reformer section 16a and is combusted in the combustion section 16b. In addition, oxygen contained in the exhaust gas is used for an oxidation reaction of gaseous ammonia in the combustion section 16b.

[0031] The system 1 also has a neutralizer 28. As described above, when the system 1 is operated, ammonia dissolves in the water 60 stored in the water tanks 12a and 22a. Therefore, when the system 1 continues to operate, the water 60 becomes alkaline. In addition, moisture generated in the combustion section 16b is supplied to the water tanks 12a and 22a, so the amount of water 60 in the water tanks 12a and 22a increases. As shown in FIG. 1, the neutralizer 28 neutralizes the water 62 overflowing from the water tanks 12a and 22a. Specifically, the neutralizer 28 neutralizes the water 62 by introducing citric acid into the water 62 in which the ammonia is dissolved, utilizing a neutralization reaction. The neutralized water 62 is treated as wastewater.

[0032] As described above, in the system 1 of this embodiment, the water tank 12a of the vaporizer 12 and the water tank 22a of the remover 22 are integrated. That is, one water tank is used to store the water 60 used for vaporizing the liquid ammonia and the water tank 22a to store the water 60 used for removing the residual ammonia, so that the system configuration can be simplified. In addition, the combustion gas contains moisture generated by the combustion of gaseous ammonia. Therefore, by supplying the combustion gas (i.e., a mixed gas of the fuel gas and the combustion gas) to the water tanks 12a and 22a, the frequency of refilling the water tanks 12a and 22a can be reduced.

[0033] Furthermore, since the mixed gas of fuel gas and combustion gas is relatively high temperature (approximately 900°C), when the mixed gas is introduced into the water 60 stored in the water tanks 12a and 22a, the residual ammonia is removed and the temperature of the water 60 is raised. In this manner, in this embodiment, the combustion gas generated in the combustion section 16b can be effectively utilized, and by integrating the combustion gas water tanks 12a and 22a, the removal of residual ammonia and the supply of energy to maintain the water temperature required for vaporizing liquid ammonia can be performed simultaneously. Therefore, in this embodiment, the system can be operated efficiently.

[0034] In this embodiment, the exhaust gas discharged from the fuel cell 20 is supplied to the combustion section 16b of the reformer 16. The exhaust gas discharged from the fuel cell 20 contains hydrogen and oxygen that remain unconsumed (unreacted) in the fuel cell 20. Therefore, in this embodiment, the combustion section 16b can generate heat by combusting the unreacted hydrogen contained in the exhaust gas, and can utilize the unreacted oxygen contained in the exhaust gas for the oxidation reaction of gaseous ammonia. Therefore, the amount of gaseous ammonia to be combusted in the combustion section 16b can be reduced, and the amount of oxygen to be supplied to the combustion section 16b can be reduced.

[0035] In addition, in this embodiment, moisture contained in the exhaust gas discharged from the fuel cell 20 is removed by the moisture separator 42 before being supplied to the combustion section 16b. That is, in this embodiment, since energy for raising the temperature of water (moisture contained in the exhaust gas) is not required in the combustion section 16b, the reforming section 16a can be heated efficiently.

[0036] In addition, in this embodiment, the moisture removed from the exhaust gas is supplied to the water tanks 12a, 22a of the vaporizer 12 and the remover 22. This makes it possible to further reduce the frequency of replenishing water to the water tanks 12a, 22a.

[0037] In this embodiment, a neutralizer 28 is provided to neutralize the water 60 stored in the water tanks 12a and 22a. The water 60 containing dissolved ammonia can be neutralized by the neutralizer 28, which can suppress corrosion of the system and unpleasant odors in the water. Furthermore, the neutralized water 62 is approximately neutral, so it can be easily treated as wastewater.

[0038] In this embodiment, the heat exchanger 14 lowers the temperature of the mixed gas of the fuel gas produced in the reformer 16a and the combustion gas generated in the combustion section 16b, and raises the temperature of the gaseous ammonia vaporized by the vaporizer 12. This allows the temperature of the gaseous ammonia to be raised in advance before it is introduced into the reformer 16. In addition, since the mixed gas is lowered in temperature, it is possible to prevent the water 60 stored in the water tanks 12a and 22a from being excessively heated.

[0039] Example 2 2, the fuel cell system 100 of the second embodiment differs from that of the first embodiment in that the water tank 112a of the vaporizer 112 and the water tank 122a of the remover 122 are separate bodies. The water tank 112a and the water tank 122a are connected by a communication pipe 114. That is, the water in the water tank 112a and the water tank 122a can circulate through the communication pipe 114. The other configurations are the same as those of the first embodiment.

[0040] In the second embodiment, the fuel gas circulation pipe 34 passes through the water 60 in the water tank 112a of the vaporizer 112, and then is introduced into the water tank 122a of the remover 122. That is, the fuel gas circulation pipe 34 first enters the water tank 112a, and is led into the water tank 122a through the communication pipe 114. The discharge hole 34c of the fuel gas circulation pipe 34 is provided so as to be located inside the water tank 122a of the remover 122.

[0041] In the system 100 of the second embodiment, a mixed gas of fuel gas and combustion gas is introduced first into the water tank 112a for vaporizing liquid ammonia. Since the mixed gas in a relatively high temperature state is introduced into the water tank 112a before the water tank 122a, the water temperature required for vaporizing liquid ammonia can be efficiently maintained by heat exchange between the mixed gas and the water 60 in the water tank 112a.

[0042] Although specific examples of the present invention have been described above in detail, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. Modifications of the above-mentioned embodiments are listed below.

[0043] (Modification) In the above embodiment, an example has been described in which liquid ammonia is used as the liquid fuel, but for example, a compound containing a hydrocarbon, alcohol, or the like may also be used as the liquid fuel.

[0044] In the above-described embodiment, the exhaust gas discharged from the fuel cell 20 does not have to be supplied to the combustion section 16b, and may be discharged, for example, to the outside of the system. In the above-described embodiment, the moisture removed from the exhaust gas by the moisture separator 42 does not have to be supplied to the water tanks 12a, 22a, and the moisture separator 42 does not have to be provided in the exhaust gas circulation pipe 36.

[0045] In the above-described first embodiment, the water tank 12a of the vaporizer 12 and the water tank 22a of the remover 22 do not have to share the same water. That is, the water tank 12a of the vaporizer 12 and the water tank 22a of the remover 22 may be configured so that they cannot flow into each other. Even in such a configuration, the combustion gas generated in the combustion section 16b can be effectively utilized by supplying the combustion gas to either the water tank 12a of the vaporizer 12 or the water tank 22a of the remover 22. The same applies to the second embodiment.

[0046] In addition, instead of using a neutralization reaction to neutralize the water 62 in the neutralizer 28, a buffer solution may be introduced and the buffering effect of the buffer solution may be used to neutralize the water 62. As the buffer solution, for example, a phosphate buffer solution may be used. Note that the neutralizer does not necessarily have to be provided.

[0047] In the above-described embodiment, the heat exchanger 14 does not necessarily have to be provided.

[0048] In the above-described embodiment, the fuel gas reformed in the reforming section 16a and the combustion gas generated in the combustion section 16b are configured to flow together through the fuel gas flow pipe 34 and be introduced into the water tanks 12a, 22a. However, the fuel gas and the combustion gas may be configured to flow through separate pipes and be separately introduced into the water tanks 12a, 22a.

[0049] Furthermore, in each embodiment, a pressure boosting mechanism for boosting the pressure of hydrogen may be provided in the hydrogen supply pipe 40. For example, an ejector, a blower, or the like may be provided in the hydrogen supply pipe 40 to supply pressurized hydrogen to the fuel cell 20. With such a configuration, the fuel gas (hydrogen) can be efficiently supplied to the fuel cell 20.

[0050] The technical elements described in this specification or drawings have technical utility either alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technologies illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives is itself technically useful. [Explanation of symbols]

[0051] 1, 100: fuel cell system, 4: liquid fuel tank, 5: liquid fuel, 6: pump, 12: vaporizer, 12a: water tank, 14: heat exchanger, 16: reformer, 16a: reforming section, 16b: combustion section, 20: fuel cell, 22: remover, 22a: water tank, 24: hydrogen permeable membrane, 26: air blower, 28: neutralizer, 42: water separator, 60: water

Claims

1. 1. A fuel cell system comprising: a vaporizer that vaporizes the liquid fuel by heat exchange with water stored in a water tank; a reformer that generates a fuel gas by reforming the gas fuel vaporized by the vaporizer; a remover that removes impurities contained in the fuel gas generated by the reformer using water stored in a water tank; a fuel cell that generates electricity using the fuel gas produced by the reformer and air; Equipped with the reformer includes a reforming unit that reforms the gaseous fuel, and a combustion unit that heats the reforming unit by combusting the gaseous fuel, The combustion gas discharged from the combustion unit is configured to be supplied to the water tank of the vaporizer and / or the water tank of the remover. Fuel cell system.

2. 2. The fuel cell system according to claim 1, The fuel cell system is configured so that exhaust gas discharged from the fuel cell is supplied to the combustion section.

3. 3. The fuel cell system according to claim 2, A fuel cell system configured such that moisture contained in the exhaust gas discharged from the fuel cell is removed before the exhaust gas is supplied to the combustion section.

4. 4. The fuel cell system according to claim 3, A fuel cell system configured such that the moisture removed from the exhaust gas discharged from the fuel cell is supplied to a water tank of the vaporizer and / or a water tank of the remover.

5. The fuel cell system according to any one of claims 1 to 4, The water tank of the vaporizer and the water tank of the remover share water. Fuel cell system.

6. The fuel cell system according to any one of claims 1 to 5, A fuel cell system, wherein the vaporizer water tank and the remover water tank are integrated.

7. The fuel cell system according to any one of claims 1 to 5, The water tank of the vaporizer and the water tank of the remover are separate and communicated with each other, A fuel cell system configured such that the combustion gas discharged from the combustion section is heat exchanged with water stored in a water tank of the vaporizer and then passes through water stored in a water tank of the remover.

8. The fuel cell system according to any one of claims 1 to 7, The fuel cell system further comprises a neutralizer that neutralizes the water stored in the water tank of the remover.

9. 9. The fuel cell system according to claim 8, The neutralizer neutralizes water by utilizing a neutralization reaction with an acid or a base.

10. 9. The fuel cell system according to claim 8, The neutralizer neutralizes water by utilizing the buffering effect of a buffer solution.

11. The fuel cell system according to any one of claims 1 to 10, The fuel cell system further comprises a heat exchanger that raises the temperature of the gaseous fuel vaporized by the vaporizer through heat exchange with the combustion gas discharged from the combustion section.

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