JP2007149529A - Desulfurizer and fuel-cell power generation system equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a desulfurizer capable of maintaining a time until exerting a prescribed desulfurization treatment ability constant even when desulfurization catalyst ability is reduced in one part of a desulfurization catalyst of a desulfurization catalyst part because of adsorption saturation. <P>SOLUTION: Since a raw material to be desulfurized in the desulfurization catalyst part is circulated vertically upward, and a high temperature fluid to heat the desulfurization catalyst part is circulated vertically downward, even when the desulfurization catalyst ability is reduced in one part of the desulfurization catalyst positioned on the upstream side of the raw material fuel because of the adsorption saturation, since elevating temperature of the desulfurization catalyst can be achieved first from the downstream side of the raw material fuel of less reduction of the desulfurization catalyst ability, the time until exerting the prescribed desulfurization catalyst ability of the desulfurizer can be maintained constant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a desulfurizer composed of a desulfurization catalyst unit that realizes a reaction temperature field for effectively operating a desulfurization catalyst, and a fuel cell power generation system including the desulfurizer.

  In a fuel cell power generation system that uses liquid fuel such as kerosene as raw fuel, kerosene contains several to several tens of ppm of sulfur components, which is caused by sulfur poisoning of catalysts used in reformers and fuel cells. In order to prevent performance degradation, a desulfurizer for removing sulfur components contained in kerosene in advance with a desulfurization catalyst is provided. In a conventional fuel cell power generation system equipped with a desulfurizer, a part of the combustion gas discharged from the heating burner of the reformer is supplied from the lower part of the desulfurizer as a heating fluid, and along the desulfurization catalyst part of the desulfurizer The desulfurization catalyst part is heated by flowing from the lower part to the upper part, and after the temperature of the desulfurization catalyst part reaches a predetermined temperature, kerosene as raw fuel is supplied from the lower part of the desulfurization catalyst part to perform the desulfurization process. The desulfurized kerosene is discharged from the upper part of the desulfurizer and led to the vaporizer. In this case, the flow direction of the heating fluid (combustion gas) for heating the desulfurization catalyst portion of the desulfurizer is the same as the flow direction of kerosene desulfurized in the desulfurization catalyst portion.

Japanese Patent Laying-Open No. 2004-31025 (page 3, FIG. 2)

  In the desulfurization catalyst constituting the desulfurization catalyst part, the sulfur component is adsorbed as the desulfurization treatment is continued, and the desulfurization catalyst performance is reduced. Therefore, the desulfurization catalyst performance on the upstream side close to the kerosene supply side, which is the target of desulfurization, is earlier than the downstream desulfurization catalyst. When the fuel cell power generation system is activated, the temperature rises first from the combustion gas supply side, that is, from the upstream side of the desulfurization catalyst unit, and the temperature of the downstream desulfurization catalyst becomes slower than the upstream side. In the conventional desulfurizer, the flow direction of the combustion gas that heats the desulfurization catalyst section and the flow direction of kerosene desulfurized in the desulfurization catalyst section are the same direction, so a part of the upstream desulfurization catalyst is adsorbed by sulfur adsorption. When the desulfurization catalyst capacity is reduced due to saturation, the temperature increase of the downstream desulfurization catalyst with a small decrease in the desulfurization catalyst capacity is delayed, and it is extra in the temperature increase until the desulfurizer exhibits the predetermined desulfurization treatment capacity. There was a problem that it took a long time.

  The present invention has been made to solve the above-described problems, and even when a part of the desulfurization catalyst in the desulfurization catalyst section has a reduced desulfurization catalyst ability due to adsorption saturation, the predetermined desulfurization treatment ability is exhibited. Thus, a desulfurizer capable of maintaining a constant time until it is obtained is obtained.

  In the desulfurizer according to the present invention, the direction in which the raw fuel desulfurized in the desulfurization catalyst part circulates and the direction in which the high-temperature fluid that heats the desulfurization catalyst part circulates along the desulfurization catalyst part. Is.

  In the present invention, the flow direction of the raw fuel desulfurized by the desulfurization catalyst portion of the desulfurizer and the flow direction of the high-temperature fluid that heats the desulfurization catalyst portion are reversed so that the desulfurization catalyst on the upstream side of the raw fuel is Even when the desulfurization catalyst capacity is reduced due to part of the adsorption saturation, the desulfurization catalyst exhibits the predetermined desulfurization capacity because the desulfurization catalyst can be heated first from the downstream side of the raw fuel with little decrease in the desulfurization catalyst capacity. Can be kept constant.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram of a fuel cell power generation system according to Embodiment 1 for carrying out the present invention. First, the configuration of the fuel cell power generation system in the present embodiment will be described. The polymer electrolyte fuel cell 2 is connected to the reformer 1 by piping so that the fuel gas generated by the reformer can be supplied to the polymer electrolyte fuel cell 2. The reformer 1 includes a reforming catalyst layer 1b for reforming a mixed gas of kerosene and water, which is a raw fuel supplied from the desulfurizer 3, into a fuel gas mainly composed of hydrogen by a reforming catalyst, The shift catalyst layer 1c which lowers the carbon monoxide concentration to 1% or less by reacting unnecessary carbon monoxide in the fuel gas obtained in the carbonaceous catalyst layer 1b with water vapor, and the fuel sent from the shift catalyst layer 1c A CO oxidation catalyst layer 1d that reduces the carbon monoxide concentration to ppm level by adding air to the gas, and these reforming catalyst layer 1b, shift catalyst layer 1c, and CO oxidation catalyst layer 1d are heated to a temperature required for the reaction. And a burner 1a. The fuel gas from which carbon monoxide has been removed by the CO oxidation catalyst layer 1d is sent to the polymer electrolyte fuel cell 2 and is used for power generation in the polymer electrolyte fuel cell 2. The polymer electrolyte fuel cell 2 is connected to the burner 1a by piping so that fuel exhaust gas can be supplied to the burner 1a.

  A desulfurizer 3 is connected to the reforming catalyst layer 1b of the reformer 1 by a pipe, and a raw fuel supply device 4 for supplying raw fuel such as kerosene to the desulfurizer 3 is connected to the desulfurizer 3. It is connected via a pipe 5. A preheating pipe section 6, a desulfurization catalyst section 7 and an outlet pipe 8 are connected to the inlet pipe 5 in this order, and the inlet pipe 5 and the outlet pipe 8 are integrally fixed to the container lid 9. The container lid 9 is tightly fitted to the container 10 so that the preheating pipe part 6 and the desulfurization catalyst part 7 are accommodated in a sealed space so that they can be fastened together. For example, a structure in which the container 10 and the container lid 9 are connected by a flange and the flange portion is sealed by gas packing can be employed.

  FIG. 2 is a schematic diagram showing a configuration of the desulfurizer 3 in the present embodiment. Between the outer wall of the desulfurization catalyst unit 7 and the inner wall of the container 10, a space through which combustion gas can flow is secured. The desulfurization catalyst unit 7 accommodated in the sealed space is arranged so that the raw fuel supplied from the raw fuel supply device 4 flows vertically upward in the desulfurization catalyst unit 7 as indicated by an arrow A in FIG. ing. The vessel 10 has a high-temperature fluid inlet 11 for introducing the combustion gas that has been burned by the burner 1a of the reformer 1 into a high-temperature fluid into the sealed space, and a high temperature for discharging the combustion gas from the sealed space. A fluid outlet 12 is attached. The high-temperature fluid inlet 11 is placed above the container so that the combustion gas introduced into the sealed space flows vertically downward in the sealed space along the desulfurization catalyst unit 7 as indicated by arrow B in FIG. The fluid discharge port 12 is attached below the container. The high-temperature fluid inlet 11 is connected to the shift catalyst layer 1c by a pipe so that the combustion gas is sent through a path that passes through the shift catalyst layer 1c of the reformer 1. From the high-temperature fluid discharge port 12, a pipe is connected to the CO oxidation catalyst layer 1 d so that the discharged combustion gas is supplied to the CO oxidation catalyst layer 1 d.

Next, the operation in this embodiment will be described. Kerosene, which is raw fuel, is introduced from the raw fuel supply means 4 into the desulfurizer 3 through the inlet pipe 5. In the desulfurizer 3, a sealed space is formed by the container lid 9 and the container 10, and combustion gas is introduced from the high temperature fluid inlet 11 through the reforming catalyst layer 1 c of the reformer 1. The combustion gas introduced into the desulfurizer 3 flows vertically downward along the desulfurization catalyst unit 7 and heats the desulfurization catalyst unit 7. On the other hand, the kerosene introduced from the inlet pipe is heated via the preheating pipe section 6 and flows to the desulfurization catalyst section 7, and flows inside the desulfurization catalyst section 7 vertically upward. At this time, the kerosene is desulfurized (desulfurized) by the desulfurization catalyst filled in the desulfurization catalyst section 7 and sent to the reforming catalyst layer 1 b of the reformer 1 via the outlet pipe 8.

  In the reformer 1, a hydrogen-based fuel gas is generated by the steam reforming reaction of the desulfurized kerosene sent from the desulfurizer 3. This fuel gas is supplied to the polymer electrolyte fuel cell 2 to generate power. A mixed gas of kerosene and water, which is a raw material, is supplied to the reforming catalyst layer 1b, and is converted into a hydrogen-based fuel gas by a reforming catalyst containing, for example, Ru or Ni as an active metal. Hydrogen generation by the steam reforming reaction requires a temperature field of about 700 ° C. in order to cause the catalytic reaction to proceed, and the steam reforming reaction is an endothermic reaction and therefore requires the necessary heat of reaction. The heat source for this purpose is combustion gas obtained by burning the fuel exhaust gas containing hydrogen by the burner 1a installed in the reformer 1. This combustion gas is not used only for the steam reforming reaction, but it realizes the temperature fields of the reforming catalyst layer 1b, the shift catalyst layer 1c and the CO oxidation catalyst layer 1d constituting the reformer 1, and the raw material and water. It is also used for vaporization. The fuel gas exiting the reforming catalyst layer 1b is supplied to the shift catalyst layer 1c, and the carbon monoxide concentration in the fuel gas is reduced from about 10% to about 0.5% by the Cu—Zn shift catalyst. . The fuel gas exiting the shift catalyst layer 1c is supplied to the CO oxidation catalyst layer 1d with a small amount of air, and the carbon monoxide concentration is further reduced to 10 ppm or less by the CO selective oxidation reaction in the CO oxidation catalyst layer 1d. The polymer electrolyte fuel cell 2 is supplied.

  The desulfurization catalyst in the desulfurization catalyst section removes sulfur components from the raw fuel by adsorbing the sulfur components. Due to the adsorption saturation of the desulfurization catalyst, the desulfurization catalyst performance decreases over time from the upstream side of the raw fuel flow. I will do it. At the time of starting the fuel cell power generation system, it is necessary to heat the desulfurization catalyst unit until the temperature reaches an appropriate temperature so that the desulfurization function can be performed in a portion where the desulfurization catalyst performance is hardly lowered. In the present embodiment, since the flow direction of the raw fuel desulfurized by the desulfurization catalyst section and the flow direction of the combustion gas that heats the desulfurization catalyst section are reversed, the desulfurization catalyst on the upstream side of the raw fuel is Even when the desulfurization catalyst capacity is partially lowered due to adsorption saturation, the temperature of the desulfurization catalyst can be increased first from the downstream side of the raw fuel with little decrease in the desulfurization catalyst capacity. As a result, the time until the desulfurizer exhibits a predetermined desulfurization capacity can be kept constant. If the flow direction of the raw fuel desulfurized in the desulfurization catalyst section and the flow direction of the combustion gas that heats the desulfurization catalyst section are the same, a part of the desulfurization catalyst on the upstream side of the raw fuel is absorbed and saturated. When the desulfurization catalyst capacity is reduced, the desulfurization catalyst having the reduced desulfurization catalyst capacity is heated first, and the downstream side where the decrease in the desulfurization catalyst capacity is small is then heated, so that the desulfurizer has a predetermined desulfurization capacity. The time until demonstrating gradually becomes longer.

  In addition, since the raw fuel flowing through the desulfurization catalyst section is configured to flow vertically upward, even if a gas such as hydrogen or methane is generated in the desulfurizer, this gas will remain in the upper part of the desulfurizer. And can be quickly discharged together with the raw fuel desulfurized from the desulfurizer.

  Further, since the inlet pipe 5, the outlet pipe 8, and the container lid 9 are integrated, the sealed space becomes a combustion gas flow path when the desulfurizer is operated, and the container 10 and the container lid are replaced when the desulfurization catalyst unit 7 is replaced. 9 and the desulfurization catalyst part 7 can be easily replaced. The desulfurization catalyst unit 7 may be easily reused as a structure that can be easily detached from the connection portion between the preheating pipe unit 6 and the outlet pipe 8.

  The combustion gas after heating the reformer 1 is discharged at a temperature of about 180 ° C. during operation of the fuel cell power generation system, and this combustion gas is supplied to the sealed space through the high-temperature fluid inlet 11 of the desulfurizer 3. Therefore, the desulfurization catalyst unit 7 can be heated by the direct combustion gas. Thereby, the temperature of the desulfurization catalyst unit 7 is increased when the fuel cell power generation system is started, and the reaction temperature field of the desulfurization catalyst unit 7 by the combustion gas is realized during operation. The temperature of the combustion gas after heating the desulfurization catalyst part 7 is about 150 ° C. This combustion gas is supplied to the CO oxidation catalyst layer 1d through the high-temperature fluid discharge port 12, and is used to realize a reaction temperature field of the CO oxidation catalyst layer 1d. It can also be used to vaporize water.

  The kerosene contains several to several tens of ppm of sulfur components, and in order to prevent performance degradation due to sulfur poisoning of the catalyst used in the reformer 1, the sulfur components contained in kerosene are previously desulfurized with a desulfurization catalyst. It is necessary to supply to the reformer 1 after removing. For desulfurization of kerosene, a desulfurization catalyst containing, for example, an active metal such as Ni is used. This desulfurization reaction requires a reaction field of, for example, 150 ° C. to 300 ° C., and desulfurization reaction with kerosene in a liquid state Is desirable. Realization of an appropriate reaction temperature field of the desulfurization catalyst section 7 of the desulfurizer 3 improves the use efficiency of the desulfurization catalyst, and enables reduction in cost, size reduction, and improvement in energy efficiency by reducing the use amount. In addition, when the sulfur component is adsorbed and saturated with long-term operation and the desulfurization performance is deactivated, it is necessary to replace the desulfurization catalyst, and the desulfurizer is small and easily replaceable as in this embodiment. The structure is desirable.

  In this embodiment, the combustion gas to be sent to the desulfurizer is sent to the desulfurizer after passing through the shift catalyst layer of the reformer. You may comprise so that it may send to a desulfurizer after passing through a layer. If the temperature field required by each component of the reformer and the desulfurizer can be realized, the combustion gas path can efficiently supply the heat of the combustion gas burned by the burner of the reformer to each component. Can be configured.

  Further, in the present embodiment, the container lid 9 and the container 10 are joined together by a structure in which the flange portion is sealed by gas packing, but other methods, for example, a seal portion is formed by a metal gasket. Airtightness may be maintained, or a structure in which the container lid and the container are fitted with screws may be employed.

Embodiment 2. FIG.
FIG. 3 is a schematic diagram of a fuel cell power generation system according to Embodiment 2 of the present invention. In the present embodiment, the constituent members constituting the fuel cell power generation system are the same as those in the first embodiment, but the arrangement of some of the constituent members is different from that in the first embodiment. In the present embodiment, the combustion gas is configured to be sent to the desulfurizer after passing through the reforming catalyst layer 1b, and the shift catalyst layer of the reformer 1 is located at a position in contact with the container 10 of the desulfurizer 3. 1c is disposed, and a CO oxidation catalyst layer 1d is disposed at a position in contact with the shift catalyst layer 1c.

  With this configuration, the desulfurization catalyst unit 7 can be heated with the combustion gas flowing in the vessel 10 of the desulfurizer 3, and at the same time, the shift catalyst layer 1c and the CO oxidation catalyst layer 1d can be heated. be able to.

  In the present embodiment, the CO oxidation catalyst layer 1d is disposed in contact with the shift catalyst layer 1c. However, the CO oxidation catalyst layer 1d may be disposed at a position in direct contact with the container 10 of the desulfurizer 3. Further, although not specifically described in the present embodiment, other components of the reformer 1, such as a water evaporation unit, may be disposed in contact with the vessel 10 of the desulfurizer 3.

Embodiment 3 FIG.
FIG. 4 is a schematic diagram of a fuel cell power generation system according to Embodiment 4 of the present invention. The configuration of the fuel cell system in the present embodiment is the same as that in the third embodiment, but the air supply means 13 is connected to the combustion gas piping connecting the reforming catalyst layer 1b to the high-temperature fluid inlet 11 of the desulfurizer 3. A temperature sensor 14 is provided which is connected and measures the temperature of the combustion gas between the high-temperature fluid inlet 11 and the air supply means 13. The air supply means 13 has a function of mixing air into the combustion gas, and the amount of air to be mixed is controlled based on the temperature of the combustion gas sent to the high temperature fluid inlet 11 measured by the temperature sensor 14. For example, the combustion gas sent from the reformer 1 can be diluted with air so that the temperature of the combustion gas sent to the high-temperature fluid inlet 11 is constant at 180 ° C.

  In the fuel cell power generation system configured as described above, when a desulfurization catalyst that desulfurizes raw fuel in a liquid state is used, the temperature of the combustion gas after air dilution is set to a temperature lower than the boiling point of the raw fuel. As a result, it is possible to prevent a decrease in desulfurization performance due to vaporization of the raw fuel. FIG. 5 is a characteristic diagram showing the temperature history of the combustion gas from the start of the reformer 1 in the present embodiment. In FIG. 5, the horizontal axis represents the time after the start of the fuel cell power generation system, the left vertical axis represents the temperature of the combustion gas, and the right vertical axis represents the flow rate of air mixed into the combustion gas from the air supply means 13. Curve 15 is the temperature of the combustion gas immediately after being discharged from the reforming catalyst layer 1b, curve 16 is the temperature of the combustion gas diluted with air detected by the temperature sensor 14, and curve 17 is the air to dilute the combustion gas. This is the flow rate of air supplied from the supply means 13.

  At the start of the fuel cell power generation system, the reformer 1 and the like are heated to a predetermined temperature by the combustion gas of the burner 1a. However, since the fuel exhaust gas is not discharged from the polymer electrolyte fuel cell 2 at the time of startup, kerosene is supplied to the burner 1a as fuel for combustion (not shown). The temperature of the combustion gas discharged from the reformer 1 gradually increases as the temperature of the reformer 1 rises as shown by a curve 15 in FIG. It is supplied to the inlet 11.

  The temperature of the combustion gas detected by the temperature sensor 14 gradually increases behind the curve 15 indicating the temperature of the combustion gas immediately after being discharged from the reforming catalyst layer 1b, as shown by the curve 16 in FIG. When the set temperature of the high-temperature fluid inlet reaches 180 ° C., dilution air starts to flow from the air supply means 13 to the combustion gas flow path in order to lower the temperature of the fuel gas, and then the flow rate of the dilution air By increasing the temperature, the temperature of the combustion gas is maintained near the set temperature of the high-temperature fluid inlet.

  In the reformer 1, after the temperature rise to a predetermined temperature is finished, the supply of water and kerosene as raw materials to the reformer 1 is started, and the production of hydrogen is started by the steam reforming reaction. Here, since the heat required for the reaction is deprived from the combustion gas and reacted, the temperature of the combustion gas immediately after being discharged from the reforming catalyst layer 1b gradually decreases as shown by the curve 15 in FIG. Along with this, the flow rate of air for maintaining the temperature of the combustion gas at the high temperature fluid inlet at the set temperature gradually decreases and converges to a flow rate that maintains the thermal balance of the entire reactor during rated operation. Since dilution air reduces the efficiency of the fuel cell power generation system, it is desirable to converge to a small air flow rate during rated operation.

  In addition, it is possible to shorten the start-up time by making the combustion heat value of the combustion gas burned by the burner 1a of the reformer 1 larger at the time of start-up than at the rated operation. Even in this case, the temperature of the combustion gas at the high-temperature fluid inlet does not exceed the set temperature.

  In the present embodiment, air is used as the fluid for diluting the combustion gas, but other fluids such as water may be used. Further, combustion exhaust gas or fuel cell exhaust gas generated in the system may be used. In this case, improvement in the thermal efficiency of the apparatus can be expected.

It is a schematic diagram which shows the structure of the fuel cell power generation system in Embodiment 1 of this invention. It is a schematic diagram which shows the structure of the desulfurizer in Embodiment 1 of this invention. It is a schematic diagram which shows the structure of the fuel cell power generation system in Embodiment 2 of this invention. It is a schematic diagram which shows the structure of the fuel cell power generation system in Embodiment 3 of this invention. It is a characteristic view which shows the temperature of the combustion gas in Embodiment 3 of this invention.

Explanation of symbols

1 reformer 1a burner 1b reforming catalyst layer 1c shift catalyst layer 1d CO oxidation catalyst layer 2 polymer electrolyte fuel cell 3 desulfurizer 4 raw fuel supply device 5 inlet pipe 6 preheating piping section 7 desulfurization catalyst section 8 outlet piping 9 Container lid 10 Container 11 Hot fluid inlet 12 Hot fluid outlet 13 Air supply means 14 Temperature sensor 15 Curve 16 Curve 17 Curve

Claims (10)

An inlet pipe through which raw fuel is introduced;
A preheating pipe connected to the inlet pipe and preheated with the raw fuel;
A desulfurization catalyst unit connected to the preheating pipe unit and desulfurized while the raw fuel is distributed;
An outlet pipe connected to the desulfurization catalyst unit and from which the desulfurized raw fuel is discharged;
A container lid in which the outlet pipe and the inlet pipe are integrated;
A container that is tightly coupled to the container lid and stores the preheating pipe section and the desulfurization catalyst section in a sealed space;
A high-temperature fluid inlet for introducing a high-temperature fluid into the sealed space attached to the container;
A high temperature attached to the container so that the high temperature fluid introduced from the high temperature fluid inlet into the sealed space flows along the desulfurization catalyst portion in a direction opposite to the direction in which the raw fuel flows. A desulfurizer comprising a fluid discharge port. The outlet pipe is connected to the upper part of the desulfurization catalyst unit so that the raw fuel flowing through the desulfurization catalyst unit flows vertically upward,
2. The desulfurizer according to claim 1, wherein the high temperature fluid inlet and the high temperature fluid outlet are attached to the vessel so that the high temperature fluid flows vertically downward along the desulfurization catalyst section. . 3. The desulfurizer according to claim 1, wherein when the raw fuel is a liquid fuel, the temperature of the high-temperature fluid is adjusted so that the desulfurization catalyst section has a temperature lower than the boiling point of the liquid fuel. A raw fuel supply device;
A desulfurizer to which raw fuel is supplied from the raw fuel supply device;
A reformer provided with a reaction element unit that is supplied with the raw fuel desulfurized from the desulfurizer and reforms the raw fuel into a fuel gas mainly composed of hydrogen;
A fuel cell power generation system including a fuel cell that is supplied with fuel gas from the reformer and generates electricity electrochemically,
The desulfurizer is
An inlet pipe into which the raw fuel is introduced;
A preheating pipe connected to the inlet pipe and preheated with the raw fuel;
A desulfurization catalyst unit connected to the preheating pipe unit and desulfurized while the raw fuel is distributed;
An outlet pipe connected to the desulfurization catalyst unit and from which the desulfurized raw fuel is discharged;
A container lid in which the outlet pipe and the inlet pipe are integrated;
A container that is tightly coupled to the container lid and stores the preheating pipe section and the desulfurization catalyst section in a sealed space;
A high-temperature fluid inlet for introducing a high-temperature fluid into the sealed space attached to the container;
A high temperature attached to the container so that the high temperature fluid introduced from the high temperature fluid inlet into the sealed space flows along the desulfurization catalyst portion in a direction opposite to the direction in which the raw fuel flows. A fluid outlet,
The combustion gas used to heat the reformer is introduced as a high-temperature fluid into the high-temperature fluid inlet of the desulfurizer via the combustion gas flow path, and is discharged from the high-temperature fluid outlet of the desulfurizer. A fuel cell power generation system, wherein the combustion gas is returned to the reformer. The outlet pipe is connected to the upper part of the desulfurization catalyst unit so that the raw fuel flowing through the desulfurization catalyst unit flows vertically upward,
5. The fuel cell according to claim 4, wherein the high temperature fluid inlet and the high temperature fluid outlet are attached to the container so that the high temperature fluid flows vertically downward along the desulfurization catalyst section. Power generation system. 6. The fuel cell power generation system according to claim 4, wherein the vessel of the desulfurizer and the reaction element portion of the reformer are brought into close contact with each other. 6. The fuel cell power generation system according to claim 4 or 5, further comprising dilution fluid supply means for mixing a dilution fluid into the combustion gas in a flow path of the combustion gas. 8. The fuel cell power generation system according to claim 7, wherein the dilution fluid is at least one selected from air, water, exhaust gas of combustion gas from a reformer, or exhaust gas of fuel gas from a fuel cell. The dilution fluid supply means includes a temperature sensor that detects the temperature of the combustion gas in the flow path of the combustion gas, and controls the mixing amount of the dilution fluid based on the temperature of the combustion gas detected by the temperature sensor. The fuel cell power generation system according to claim 7, characterized in that: 6. The fuel according to claim 4, wherein when the fuel cell power generation system is started, a combustion calorific value of the combustion gas of the reformer is set to be larger than that during rated operation of the fuel cell power generation system. Battery power generation system.

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