JP5183118B2 - Power generation system - Google Patents

Description

  The present invention relates to a power generation system, and more particularly to a power generation system including a fuel cell having an anode and a cathode, and using a gas containing carbon dioxide such as exhaust gas from a power plant as an oxidant for the fuel cell.

  Thermal power plants generate steam by burning fuel such as coal and liquefied natural gas in a boiler, and generate power by driving a turbine with the steam. The thermal power plant emits exhaust gas containing about 15% of carbon dioxide, for example, along with this power generation. Since carbon dioxide contained in exhaust gas discharged from a thermal power plant is a causative substance of global warming, attempts have been made to reduce the amount of carbon dioxide remaining in the atmosphere.

As a technology to reduce carbon dioxide generated from a thermal power plant, carbon dioxide separation that reduces carbon dioxide using carbon dioxide as carbonate ions is performed by supplying exhaust gas from the thermal power plant to a porous cathode and performing an electrochemical reaction. A method is known (see, for example, Patent Document 1).
JP-A-11-223475

  Here, in this type of carbon dioxide separation method, in order to separate carbon dioxide, it is necessary to supply hydrogen gas to the anode. Conventionally, hydrogen gas has been generated, for example, by steaming water supplied from the outside and reacting the water vapor with natural gas containing methane.

  However, in order to prepare hydrogen corresponding to a large amount of exhaust gas discharged from a thermal power plant, a large amount of water vapor is required. If water vapor is insufficient, the supply of hydrogen to the anode is not stable, Further, if a separate heat source for generating water vapor is provided, energy loss occurs, and the efficiency of carbon dioxide recovery decreases.

  The present invention has been made in view of such problems, and an object of the present invention is to efficiently generate carbon dioxide gas contained in this gas while performing power generation using the gas containing carbon dioxide as an oxidant. It is to provide a power generation system that can be recovered.

  The present inventors collect water from the cathode exhaust gas discharged from the cathode and generate hydrogen by steaming this water to generate power using a gas containing carbon dioxide gas as an oxidant, while generating this gas. From this, it was found that carbon dioxide gas can be efficiently recovered, and the present invention has been completed.

The present invention solves the above problems by the following means.
According to the first aspect of the present invention, a hydrogen gas generation device that generates hydrogen gas by reacting water vapor and a fuel gas including methane, a cathode that is supplied with a gas that includes carbon dioxide gas, and the hydrogen gas generation device. And a carbon dioxide recovery device for recovering a part of the carbon dioxide gas contained in the anode exhaust gas by liquefaction or solidification from the anode exhaust gas discharged from the anode. And a water recovery device for recovering water from the cathode exhaust gas discharged from the cathode, and the water recovered by the water recovery device as a refrigerant, provided between the anode and the carbon dioxide recovery device. A cooler that cools the anode exhaust gas supplied to the carbon recovery device in advance, and the anode exhaust gas is cooled and then discharged from the cooler. That water and a steam generator for steam of, the said hydrogen gas generator, a power generation system characterized by generating steam generated in the steam generating device is supplied.

  In the power generation system according to claim 1, the fuel cell separates and extracts carbon dioxide while performing power generation using, for example, a gas containing carbon dioxide gas such as exhaust gas discharged from a thermal power plant as an oxidant. Then, the carbon dioxide recovery device recovers the carbon dioxide by liquefying or solidifying it. At the same time, the water recovery device recovers water from the cathode exhaust gas discharged from the cathode.

  Here, the water recovered by the water recovery device is steamed by the water vapor generation device, and the hydrogen gas generation device generates hydrogen gas using the water vapor. Therefore, hydrogen gas can be stably supplied to the anode, and carbon dioxide gas can be efficiently recovered. In addition, the cooler that cools the anode exhaust gas cools the anode exhaust gas using the water recovered by the water recovery device as a refrigerant, so that the temperature of the water supplied to the steam generation device can be increased, and the steam can be efficiently Can be generated.

  According to a second aspect of the present invention, in the power generation system according to the first aspect, the hydrogen gas generation device is supplied with externally supplied water vapor supplied from the outside together with the generated water vapor generated in the water vapor generation device. This is a power generation system characterized by that.

  The power generation system according to claim 2 can stably supply hydrogen gas to the anode because it uses externally supplied water vapor supplied from the outside even when the generated water vapor generated by the water vapor generating device is insufficient. . Therefore, power generation can be performed stably and carbon dioxide gas can be recovered stably.

  The invention according to claim 3 is the power generation system according to claim 1 or 2, further comprising a steam power generation unit that performs power generation using the generated steam supplied from the steam generation device to the hydrogen gas generation device. This is a power generation system characterized by that.

  Since the power generation system according to claim 3 generates power using steam together with power generation by the fuel cell, power generation efficiency is improved.

  According to a fourth aspect of the present invention, in the power generation system according to any one of the first to third aspects, the water vapor generating device is connected to the cathode and cools the cathode exhaust gas and the anode exhaust gas. The power generation system is characterized in that the temperature of the cathode exhaust gas is lowered and the water is vaporized by performing heat exchange with water discharged from the cooler.

  The power generation system according to claim 4 is efficient because it uses the exhaust heat of the cathode exhaust gas when generating water vapor.

  According to a fifth aspect of the present invention, in the power generation system according to any one of the first to fourth aspects, a heat exchanger is provided between the anode and the cooler, and the heat exchanger includes the heat exchanger, A power generation system characterized in that the anode exhaust gas supplied to the cooler is cooled in advance by exchanging heat between the return gas returned from the carbon dioxide recovery device and containing unreacted gas and the anode exhaust gas. It is.

  In the power generation system according to the fifth aspect, the anode exhaust gas is cooled in advance in the heat exchanger before the anode exhaust gas is cooled in the cooler. Here, since the heat exchanger performs heat exchange using the return gas cooled by the cooler and the carbon dioxide recovery device, the temperature of the anode exhaust gas can be lowered efficiently.

  A sixth aspect of the present invention is the power generation system according to the fifth aspect, further comprising a gas circulation means for returning the return gas returned to the heat exchanger to the hydrogen gas generating device after heat exchange in the heat exchanger. It is a power generation system characterized by comprising.

  Since the power generation system according to claim 6 returns the return gas to the cathode and circulates the gas between the fuel cell and the carbon dioxide recovery device, unreacted hydrogen in the return gas is effective as a heat source for the hydrogen gas generation device. Available to:

  According to a seventh aspect of the present invention, in the power generation system according to any one of the first to sixth aspects, the fuel cell is disposed between the anode and the cathode, and a molten carbonate is used as an electrolyte. A power generation system comprising the electrolyte plate used.

  Since the power generation system according to the seventh aspect generates power with the molten carbonate fuel cell, the power generation efficiency is good.

  According to the power generation system of the present invention, carbon dioxide gas is efficiently and stably generated from the power plant exhaust gas discharged from the thermal power plant while generating power using the power plant exhaust gas discharged from the thermal power plant. And can be recovered.

Hereinafter, an embodiment of a power generation system to which the present invention is applied will be described with reference to the drawings.
Drawing 1 is a figure showing the composition of the power generation system of an embodiment.
FIG. 2 is a diagram illustrating a structure of an MCFC (Molten Carbonate Fuel Cell) provided in the power generation system illustrated in FIG. 1.

  The power generation system 10 of the embodiment generates power by supplying power plant exhaust gas (combustion gas discharged from the coal-fired boiler 101) discharged from the thermal power plant 100 to the fuel cell (MCFC 23), and power plant exhaust gas. The carbon dioxide gas contained in is liquefied and recovered. The temperature of the power plant exhaust gas discharged from the power plant is, for example, about 100 ° C., and carbon dioxide gas is included in this, for example, about 15%.

  As shown in FIG. 1, the power generation system 10 includes a first power generation unit 20, a water recovery unit 30, a second power generation unit 40, a cathode recycling blower 50, a third power generation unit 60, and a carbon dioxide recovery unit 70. I have. These elements forming the power generation system 10 are connected by piping or the like. Gases such as power plant exhaust gas, water vapor, hydrogen gas, anode exhaust gas, and cathode exhaust gas, and liquids such as water pass through the piping. Move between the above elements.

  The first power generation unit 20 is a part that generates power using the power plant exhaust gas discharged from the thermal power plant 100 as an oxidant, and includes a fuel preheater 21, a reformer 22 (reforming chamber 22a, heating chamber 22b), and MCFC 23. (Cathode 23a, Anode 23b) and catalytic combustion chamber 24 are provided.

  The fuel preheater 21 performs heat exchange between natural gas and water vapor supplied from the outside and hydrogen gas generated in a reforming chamber 22a of the reformer 22, which will be described later. This is the part where the temperature rises to about 380 ° C. On the other hand, the hydrogen gas discharged from the fuel preheater 21 is supplied to the anode 23b.

  The reformer 22 is a part that functions as a hydrogen gas generator, and includes a reforming chamber 22a having a catalyst. The reforming chamber 22a generates hydrogen gas by reacting methane and water vapor contained in the natural gas supplied from the fuel preheater 21 (see (Equation 1)). The reformer 22 includes a heating chamber 22b, and the reforming chamber 22a is maintained at a predetermined temperature (for example, about 780 ° C.) or more suitable for the reforming reaction of natural gas by the heating chamber 22b. .

CH ₄ + H ₂ O → CO + 3H ₂ (Formula 1)

  The hydrogen gas generated in the reforming chamber 22a is returned to the fuel preheater 21, and is cooled to, for example, about 580 ° C., and then supplied to the anode 23b of the MCFC 23 described later.

  Here, in the power generation system 10 of the present embodiment, two lines for supplying water vapor to the fuel preheater 21 are prepared. Among these, one system supplies the fuel preheater 21 with water vapor (externally supplied water vapor) generated in the thermal power plant 100. The other one system supplies the fuel preheater 21 with water vapor (generated water vapor) generated by an exhaust heat recovery boiler 32 described later.

  As shown in FIG. 2, the MCFC 23 is a molten carbonate fuel cell including a cathode 23a and an anode 23b, and an electrolyte plate 23c using a molten carbonate as an electrolyte between these electrodes. The MCFC 23 is configured to operate at about 650 ° C., for example.

  The cathode 23a generates carbonate ions from the oxygen and carbon dioxide gas contained in the mixed gas (power plant exhaust gas and air) supplied by the cathode recycle blower 50, which will be described later, by the electrochemical reaction shown in (Formula 2), And exhaust gas of cathode containing unreacted gas. The temperature of the cathode exhaust gas discharged from the cathode 23a is, for example, about 650 ° C.

1 / 2O ₂ + CO ₂ + 2e ⁻ → CO ₃ ²⁻ (Formula 2)

  A part of the cathode exhaust gas is appropriately supplied to a catalytic combustion chamber 24 described later. The cathode exhaust gas is partially returned to the cathode recycling blower 50. This is to prevent the MCFC 23 that performs an exothermic reaction from being overheated by increasing the amount of gas introduced into the cathode 23a.

  The remaining cathode exhaust gas not supplied to the catalyst combustion chamber 24 and the cathode recycle blower 50 is supplied to a water recovery unit 30 described later.

  The anode 23b reacts the carbonate ions generated by the cathode 23a with the hydrogen supplied from the fuel preheater 21 (see (Equation 3)), and discharges the anode exhaust gas containing water vapor and unreacted gas. The temperature of the anode exhaust gas is, for example, about 656 ° C. near the outlet of the anode 23b.

H ₂ + CO ₃ ²⁻ → CO ₂ + H ₂ O + 2e ⁻ (Formula 3)

  A part of the anode exhaust gas is appropriately supplied to a catalytic combustion chamber 24 described later. Further, the cathode exhaust gas not supplied to the catalytic combustion chamber 24 is supplied to a heat exchanger 71 provided in a carbon dioxide recovery unit 70 described later.

  The catalytic combustion chamber 24 is a part that mixes and burns unreacted hydrogen contained in the anode exhaust gas and unreacted oxygen contained in the cathode exhaust gas, and these gases become, for example, about 790 ° C. after the combustion, and the above-described reforming is performed. It is supplied to the heating chamber 22 b of the vessel 22. The mixed combustion gas supplied to the heating chamber 22b is returned to the cathode recycle blower 50 described later.

  The water recovery unit 30 is a part that liquefies and recovers water vapor contained in the cathode exhaust gas discharged from the cathode 23a, and includes an auxiliary combustion chamber 31, an exhaust heat recovery boiler 32, and a steam / water separator 33. .

  The auxiliary combustion chamber 31 raises the temperature of the cathode exhaust gas using natural gas as an auxiliary fuel when the temperature of the cathode exhaust gas is low. In addition, when the temperature of the cathode exhaust gas is particularly low, such as when the power generation system 1 is started, a mixed gas of power plant exhaust gas and air discharged from the thermal power plant 100 is introduced into the auxiliary combustion chamber 31.

  The cathode exhaust gas that has passed through the auxiliary combustion chamber 31 passes through a gas turbine 41 provided in the second power generation unit 40 described later, and is supplied to the exhaust heat recovery boiler 32. The gas turbine 41 will be described later.

  The exhaust heat recovery boiler 32 performs heat exchange between the cathode exhaust gas (for example, about 500 ° C.) that has passed through the auxiliary combustion chamber 31 and water (for example, about 15 ° C.) discharged from the cooler 72 described later, It is a part that generates water vapor. As a result, the cathode exhaust gas that has passed through the exhaust heat recovery boiler 32 is cooled to about 193 ° C., for example. Here, in this specification, when it is simply referred to as water, it means liquid water and is distinguished from gaseous water vapor.

  The steam generated in the exhaust heat recovery boiler 32 is sent to a steam turbine 61 provided in a third power generation unit 60 described later. The steam turbine 61 will be described later.

  The steam separator 33 passes through the auxiliary combustion chamber 31 and the exhaust heat recovery boiler 32, further cools the cathode exhaust gas whose temperature has been lowered in advance to, for example, about 15 ° C., and separates moisture contained in the cathode exhaust gas. It is a water recovery device. The cathode exhaust gas after the moisture is separated is released into the atmosphere as exhaust gas, for example.

  The water taken out by the steam separator 33 is supplied by a pump P to a cooler 72 provided in a carbon dioxide recovery unit 70 described later. This water functions as a refrigerant for cooling the anode exhaust gas in the cooler 72.

  The second power generation unit 40 is a part that generates power using cathode exhaust gas discharged from the cathode 23 a, and includes a gas turbine 41, a compressor 42, and a generator 43.

  The gas turbine 41 is driven using cathode exhaust gas supplied from the auxiliary combustion chamber 31 toward the exhaust heat recovery boiler 32.

  The compressor 42 is driven in conjunction with the gas turbine 41. The compressor 42 mixes power plant exhaust gas discharged from the thermal power plant 100 and air, and supplies the mixed gas to the cathode 23a.

  The generator 43 generates power by being driven in conjunction with the gas turbine 41. For example, the generator 43 supplies electricity to the electric motor M provided in the cathode recycling blower 50.

  The cathode recycle blower 50 is a blower provided with an electric motor M, and converts the mixed gas discharged from the compressor 42, a part of the cathode exhaust gas discharged from the cathode 23a, and the gas discharged from the heating chamber 22b to the cathode. It supplies to 23a.

  The third power generation unit 60 is a steam power generation unit that generates power using steam generated by the exhaust heat recovery boiler 32 provided in the water recovery unit 30, and includes a steam turbine 61, a compressor 62, and a generator 63. ing.

  The steam turbine 61 is connected to the exhaust heat recovery boiler 32, and the steam discharged from the exhaust heat recovery boiler 32 is supplied. The steam turbine 61 is driven using this water vapor.

  The steam that has driven the steam turbine 61 is returned to the vicinity of the entrance of the fuel preheater 21 provided in the first power generation unit 20, and is supplied to the fuel preheater 21 together with the steam discharged from the thermal power plant. These steams reform natural gas in the reforming chamber 22a as described above to generate hydrogen gas.

  The compressor 62 is driven in conjunction with the steam turbine 61. The compressor 42 and the compressor 62 described above cooperate to mix the power plant exhaust gas discharged from the thermal power plant 100 and air, and supply the mixed gas to the cathode 23a.

  The generator 63 generates power by being driven in conjunction with the steam turbine 61. The usage of electricity generated by the generator 63 is not particularly limited.

  The carbon dioxide recovery unit 70 is a part that liquefies and recovers carbon dioxide gas contained in the anode exhaust gas, and includes a heat exchanger 71, a cooler 72, and a carbon dioxide recovery device 73. The heat exchanger 71 is provided between the anode 23 b and the cooler 72, and the cooler 72 is provided between the heat exchanger 71 and the carbon dioxide recovery device 73.

  Here, in this specification, that the heat exchanger 71 is provided between the anode 23b and the cooler 72 means that the anode 23b, the heat exchanger 71, and the cooler 72 are along the direction in which the anode exhaust gas flows. Means that the heat exchanger 71 is provided in this order, and does not mean that the heat exchanger 71 is actually disposed between the anode 23 b and the cooler 72. The same applies to the cooler 72.

  The heat exchanger 71 exchanges the heat of the anode exhaust gas, for example, about 636 ° C. discharged from the anode 23b, and the heat of the return gas, for example, about 30 ° C. returned from the carbon dioxide recovery device 73 described later. The temperature of the return gas is raised and the temperature of the anode exhaust gas is lowered.

  The cooler 72 is a part that further cools the anode exhaust gas cooled by the heat exchanger 71. The water vapor contained in the anode exhaust gas is thereby liquefied and removed from the anode exhaust gas.

  Here, as described above, the water generated by the steam separator 33 provided in the water recovery unit 30 is supplied to the cooler 72 by the pump P. The cooler 72 performs heat exchange between this water (for example, about 15 ° C.) and the anode exhaust gas (for example, about 560 ° C.) (in some cases, by using another refrigerant together), For example, it is cooled to about 30 ° C.

  The carbon dioxide recovery device 73 includes a pressure vessel (not shown), and the anode exhaust gas supplied from the cooler 72 is accommodated in the pressure vessel. The carbon dioxide recovery device 73 can liquefy and recover the carbon dioxide gas contained in the anode exhaust gas by pressurizing and cooling the anode exhaust gas accommodated in the pressure vessel.

  In contrast, anode exhaust gas (for example, about 30 ° C.) containing unreacted gas such as hydrogen gas that is not recovered by the carbon dioxide recovery device 73 is returned to the heat exchanger 71 as a return gas and discharged from the anode 23b. By performing heat exchange with the anode exhaust gas (for example, about 636 ° C.), the temperature is raised to, for example, about 580 ° C.

  The heated return gas is returned to the catalytic combustion chamber 24 provided in the first power generation unit 20 and mixed with oxygen contained in the cathode exhaust gas, so that the temperature becomes, for example, about 790 ° C. After that, the return gas is supplied to the heating chamber 22b by an air supply device (not shown) that functions as a gas circulating means, and the natural gas and steam supplied from the fuel preheater 21 to the reforming chamber 22a are reformed. It becomes a heat source. The return gas is lowered to, for example, about 636 ° C. by being used as a heat source for reforming natural gas.

  The temperature-returned return gas is supplied to the cathode recycling blower 50, and is returned again to the cathode 23a by the cathode recycling blower 50. A part of the anode exhaust gas discharged from the anode 23 b is circulated through the cathode 23 a and the carbon dioxide recovery unit 70.

  Next, the flow at the time of recovering the carbon dioxide gas discharged from the thermal power plant 100 by the power generation system 10 of the present embodiment will be described.

  The power plant exhaust gas discharged from the coal-fired boiler 101 provided in the thermal power plant 100 is mixed with air by the compressors 42 and 62, and this mixed gas is supplied to the cathode 23a provided in the MCFC 23.

  The mixed gas supplied to the cathode 23a is used as an oxidant in the MCFC 23, and the MCFC 23 generates electric power and discharges anode exhaust gas containing carbon dioxide gas from the anode 23b. The anode exhaust gas discharged from the anode 23b is supplied to the carbon dioxide recovery unit 70, and the carbon dioxide recovery unit 70 liquefies and recovers carbon dioxide gas contained in the anode exhaust gas.

  Here, the MCFC 23 has a carbon dioxide concentration function in which the carbon dioxide concentration in the anode exhaust gas becomes higher after the power generation reaction than before the power generation reaction (see FIG. 2). The carbon dioxide contained in the exhaust gas is concentrated.

  In the power generation system 10 of the present embodiment, the carbon dioxide gas contained in the anode exhaust gas is liquefied, whereby about 40% of the carbon dioxide gas contained in the power plant exhaust gas supplied to the power generation system 10 is collected by the carbon dioxide recovery device 73. Can be recovered. The usage application of the carbon dioxide (liquid) recovered in the carbon dioxide recovery device 73 is not particularly limited, and may be used for other industrial applications, or may be isolated on the seabed (in the sea).

The power generation system 10 of the embodiment described above can obtain the following effects.
(1) The power plant exhaust gas discharged from the thermal power plant 100 contains various components such as water vapor and nitrogen gas in addition to the carbon dioxide gas, but carbon dioxide is added to the anode exhaust gas by the carbon dioxide concentration function of the MCFC 23. Since it is concentrated, carbon dioxide can be easily and efficiently recovered from the power plant exhaust gas.

(2) Since the anode exhaust gas is cooled in advance by the heat exchanger 71 and the cooler 72 at a stage before the carbon dioxide is recovered by the carbon dioxide recovery device 73, the load on the carbon dioxide recovery device 73 can be reduced.

(3) The cooler 72 uses the water recovered by the water recovery unit 30 to cool the anode exhaust gas, so that it is not necessary to use a refrigerant or the like and the efficiency is high.

(4) Since the heat exchanger 71 uses the return gas (about 30 ° C.) cooled by the cooler 72 and the carbon dioxide recovery device 73 to lower the temperature of the anode exhaust gas, the heat exchanger 71 is efficient.

(5) Since the unreacted gas that has not been recovered by the carbon dioxide recovery device 73 is returned to the MCFC 23 as a return gas, the amount of gas released into the atmosphere can be reduced.

(6) Since the third power generation unit 60 that generates power using the steam generated by the exhaust heat recovery boiler 32 provided in the water recovery unit 30 is provided, unreacted hydrogen in the return gas can be effectively used.

(7) Since the MCFC 23 having particularly high power generation efficiency is used as the fuel cell, the power generation efficiency is good.

[Deformation]
The present invention is not limited to the configuration described in the embodiment described above, and various modifications and changes are possible, and these are also included in the technical scope of the present invention.

(1) The configuration of the power generation system of the present invention is not limited to that described in the embodiment, and can be changed as appropriate. For example, the carbon dioxide recovery device of the embodiment is for recovering by liquefying carbon dioxide gas. However, the present invention is not limited to this. For example, the carbon dioxide recovery device recovers carbon dioxide by solidification (dry ice). May be.

(2) The method for recovering carbon dioxide is not limited to the method described in the embodiment. For example, a chemical absorption method (amine method, etc.), an adsorption method (PSA method, etc.), a membrane separation method (polymer membrane, etc.), etc. Other known carbon dioxide recovery methods may be used.

(3) The power plant exhaust gas discharged from the thermal power plant may be generated, for example, by burning coal or by burning natural gas. Further, it may be generated by burning other fuel.

(4) The power generation system of the present invention may be used in combination with an exhaust source of gas containing carbon dioxide, such as a chemical plant or a cleaning factory, even if it is not a thermal power plant exhaust gas, and may collect the carbon dioxide.

It is a figure which shows the structure of the electric power generation system of embodiment. It is a figure which shows the structure of MCFC with which the electric power generation system shown in FIG. 1 was equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power generation system 20 1st power generation part 22 Reformer 22a Reformation chamber 22b Heating chamber 23 MCFC
23a Cathode 23b Anode 30 Water recovery unit 32 Waste heat recovery boiler 33 Gas / water separator 40 Second power generation unit 50 Cathode recycle blower 60 Third power generation unit 70 Carbon dioxide recovery unit 71 Heat exchanger 72 Cooler 73 Carbon dioxide recovery device 100 Power plant

Claims (6)

A hydrogen gas generator that reacts water vapor with a fuel gas containing methane to generate hydrogen gas; and
A fuel cell having a cathode to which a gas containing carbon dioxide gas is supplied, and an anode to which the hydrogen gas generated by the hydrogen gas generator is supplied;
A carbon dioxide recovery device for recovering a part of carbon dioxide gas contained in the anode exhaust gas by liquefaction or solidification from the anode exhaust gas discharged from the anode;
A water recovery device for recovering water from the cathode exhaust gas discharged from the cathode;
A cooler that is provided between the anode and the carbon dioxide recovery device and that precools the anode exhaust gas supplied to the carbon dioxide recovery device using water recovered by the water recovery device as a refrigerant;
A water vapor generating device that vaporizes water discharged from the cooler after cooling the anode exhaust gas,
The hydrogen gas generator is supplied with the generated steam generated in the steam generator ,
The water vapor generating device is connected to the cathode and cools the cathode exhaust gas and the anode exhaust gas, and then performs heat exchange with water discharged from the cooler, thereby lowering the temperature of the cathode exhaust gas and supplying the water. power generation system characterized that you steam reduction. The power generation system according to claim 1,
The power generation system, wherein an externally supplied water vapor supplied from outside is supplied to the hydrogen gas generation device together with the generated water vapor generated in the water vapor generation device. The power generation system according to claim 1 or claim 2,
A power generation system comprising: a steam power generation unit configured to generate power using the generated steam supplied from the steam generation device to the hydrogen gas generation device. The power generation system according to any one of claims 1 to 3 ,
A heat exchanger is provided between the anode and the cooler;
The heat exchanger preliminarily lowers the temperature of the anode exhaust gas supplied to the cooler by performing heat exchange between the return gas returned from the carbon dioxide recovery device and containing the unreacted gas and the anode exhaust gas. A power generation system characterized by this. The power generation system according to claim 4 ,
A power generation system, further comprising gas circulation means for returning the return gas returned to the heat exchanger to the hydrogen gas generator after heat exchange in the heat exchanger. The power generation system according to any one of claims 1 to 5 ,
The fuel cell includes an electrolyte plate that is disposed between the anode and the cathode and uses molten carbonate as an electrolyte.

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