JP2016066557A - Fuel cell power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell power generator that is one having an inexpensive and simple structure capable of cooling part of a desulfurizer disposed in a high temperature region, one having a structure capable of heating a fuel gas having normal temperature before flowing in the desulfurizer, or the like.SOLUTION: A fuel cell power generator 1 comprising a fuel cell power generation unit 21, a fuel gas supply passage 15 for supplying a fuel gas to the fuel cell power generation unit 21, and a desulfurizer 22 for removing a sulfur content in the fuel gas has a configuration in which the desulfurizer 22 is disposed in a high temperature region to be heated to high temperature during power generation operation of the fuel cell power generation unit 21, the fuel gas supply passage 15's part upstream from the desulfurizer 22 performs heat exchange with part of the desulfurizer 22, and the desulfurizer 22's part corresponding to part of the inside of the desulfurizer 22 having low flow rate of the fuel gas performs heat exchange with the fuel gas supply passage 15.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fuel cell power generator, and more particularly, to a fuel cell power generator in which a desulfurizer for desulfurizing fuel gas is disposed in a high temperature region near a fuel cell power generator.

  Conventionally, electric power is generated by converting chemical energy into electrical energy through an oxidation-reduction reaction between air and reformed fuel gas (hydrogen-containing gas), and the waste heat generated as a result of this power generation is generated as hot water. The fuel cell cogeneration system to be recovered as is being put into practical use. This fuel cell cogeneration system includes a fuel cell power generation device that generates power, a hot water hot water supply device that stores hot water after heat exchange by exhaust heat recovery, and exhaust heat that circulates hot water between the fuel cell power generation device and the hot water storage hot water supply device. A recovery circuit is provided.

  The fuel cell power generator described above is a fuel cell stack that generates power with air and reformed fuel gas, and a fuel reformer that generates reformed fuel gas to be supplied to the fuel cell stack from pure water (steam) and fuel gas. A fuel cell power generation unit having a gas generator and an evaporator, an exhaust passage for exhausting exhaust gas from the fuel cell power generation unit to the outside, an exhaust gas installed in the exhaust passage and the hot water storage hot water storage device An exhaust heat recovery heat exchanger that exchanges heat with hot water stored in the tank is provided.

  By the way, the city gas, LPG, etc. in which the sulfur compound is mixed as an odorant are used for the fuel gas supplied to said fuel reformer. For this reason, when the fuel gas containing a sulfur compound is directly supplied to the fuel reformer, there is a problem that the catalyst of the fuel reformer is deteriorated by the sulfur compound. Therefore, conventionally, a desulfurizer is provided in the middle of the fuel gas supply passage in order to remove sulfur compounds in the fuel gas.

  The above desulfurizer is generally equipped with an adsorption-type room temperature desulfurization agent that functions at room temperature, such as zeolite, silica gel, activated carbon, etc., that adsorbs sulfur compounds in fuel gas. However, in order to make the fuel cell power generation system maintenance-free, the desulfurizer must be equipped with an enormous amount of room-temperature desulfurization agent equivalent to the life of the equipment, so the desulfurizer becomes extremely large (large capacity) There is a problem of end up.

  Therefore, conventionally, a technique has been put to practical use in which hydrogen is added to a fuel gas before desulfurization and then desulfurization is performed using an ultrahigh-order desulfurization agent (hydrogenation-type desulfurization agent). This super high-order desulfurization agent can extremely reduce the amount of desulfurization agent (for example, about 1/10 of the normal temperature desulfurization agent) as compared with the normal temperature desulfurization agent. However, the ultra-high-order desulfurization agent is a high-temperature desulfurization agent that exhibits its performance most in a high temperature (about 200 to 300 ° C.) environment. For this reason, a technique is generally known in which a desulfurizer is disposed in a high temperature region near the fuel cell power generation unit and the desulfurizer is heated using heat generated by the power generation of the fuel cell power generation unit (see Patent Document 1). .

  However, when the desulfurizer is heated using the heat of the fuel cell power generation section, an operating temperature suitable for the high-temperature desulfurization agent in the desulfurizer is obtained by inserting a heat insulating material between the fuel cell power generation section and the desulfurizer. The temperature is adjusted so that the heat insulating material is partially heated according to the arrangement structure of various devices of the fuel cell power generation unit, and a part of the high-temperature desulfurizing agent is higher than the operating temperature (eg, 340 ° C. or higher). In this case, there is a problem that the high-temperature desulfurizing agent is sintered and the desulfurization performance is greatly reduced.

  Therefore, in order to solve the above problem, for example, in the solid oxide fuel cell system of Patent Document 1, when the temperature of the desulfurizer exceeds a predetermined temperature, air supplied from the outside is used. A structure for cooling the desulfurizer is disclosed. In particular, in FIG. 5 of Patent Document 1, a cooling air heat exchanger is installed in the power generation air supply passage, the cooling air heat exchanger is disposed adjacent to the desulfurizer, and the power generation air is supplied. A structure in which the desulfurizer is cooled by use is disclosed.

JP 2014-107187 A

  However, in the solid oxide fuel cell system of Patent Document 1, a cooling air heat exchanger is installed in the middle of the air supply passage in any structure in order to cool the desulfurizer disposed in the high temperature region. Since it has a structure, it is necessary to additionally incorporate a cooling-dedicated part into the fuel cell power generation apparatus, which increases the number of parts and increases the cost.

  Moreover, if there is a drift in the fuel gas flowing inside the desulfurizer, or if the desulfurizer is partially heated according to the heat distribution in the high temperature region where the desulfurizer is placed, the high temperature inside the desulfurizer Since the temperature distribution of the desulfurization agent is also biased, in the structure in which the entire desulfurizer is uniformly cooled as in the solid oxide fuel cell system of Patent Document 1, the overheated portion of the desulfurizer can be cooled. At the same time, the portion within the operating temperature range of the desulfurizer is also cooled, and there is a possibility that the performance of the high-temperature desulfurizing agent cannot be sufficiently exhibited.

  An object of the present invention is to provide a fuel cell power generator having a structure capable of cooling a part of a desulfurizer arranged in a high temperature region with a low cost and a simple structure, and cooling only an overheated portion of the desulfurizer. It is to provide a structure having a possible structure, a structure having a structure capable of heating a normal temperature fuel gas before flowing into the desulfurizer, and the like.

  The fuel cell power generator according to claim 1 comprises a fuel cell power generation unit, a fuel gas supply passage for supplying fuel gas to the fuel cell power generation unit, and a desulfurizer for removing sulfur content in the fuel gas, In the fuel cell power generation apparatus in which the desulfurizer is disposed in a high temperature region that becomes high during power generation operation of the fuel cell power generation unit, heat exchange is performed between the fuel gas supply passage upstream of the desulfurizer and a part of the desulfurizer. It is characterized by being configured.

  According to a second aspect of the present invention, there is provided the fuel cell power generation device according to the first aspect, wherein a part of the desulfurizer corresponding to a portion where the flow rate of the fuel gas in the desulfurizer is low exchanges heat with the fuel gas supply passage. It is configured as described above.

  According to a third aspect of the present invention, there is provided the fuel cell power generator according to the first aspect, wherein a part of the desulfurizer corresponding to a portion where the temperature of the heat distribution in the high temperature region is high exchanges heat with the fuel gas supply passage. It is characterized by being composed.

  According to the first aspect of the present invention, the fuel cell power generator is configured to exchange heat between the fuel gas supply passage upstream of the desulfurizer and a part of the desulfurizer, and therefore flows through the fuel gas supply passage. A part of the desulfurizer can be cooled by using the fuel gas before flowing into the desulfurizer, and the fuel gas before flowing into the desulfurizer can be heated by using the desulfurizer. it can.

  Accordingly, since the desulfurizer disposed in the high temperature region can be cooled using the existing fuel gas supply passage, there is no need to additionally provide a dedicated member for cooling, and the structure is low in cost and simple. Thus, a cooling structure for the desulfurizer can be realized. Moreover, since the fuel gas before flowing into the desulfurizer can be heated using the desulfurizer arranged in the high temperature region, it is possible to prevent the normal temperature fuel gas from flowing into the desulfurizer, It is possible to prevent a decrease in the desulfurization performance of the desulfurization agent in the vicinity of the inlet inside the desulfurizer.

  According to the second aspect of the present invention, since a part of the desulfurizer corresponding to the portion where the flow rate of the fuel gas in the desulfurizer is low and the fuel gas supply passage are configured to exchange heat, the fuel of the desulfurizer A portion where the gas flow rate is low and the fuel gas stays and is likely to be overheated can be cooled by the fuel gas flowing through the fuel gas supply passage.

  According to the invention of claim 3, since the part of the desulfurizer corresponding to the portion where the temperature of the heat distribution in the high temperature region is high and the fuel gas supply passage are configured to exchange heat, the high temperature region of the desulfurizer The portion that is likely to be overheated in accordance with the heat distribution of can be cooled by the fuel gas flowing through the fuel gas supply passage.

1 is a schematic configuration diagram of a fuel cell power generator according to an embodiment of the present invention. It is a schematic block diagram of a fuel cell power generation module. It is a schematic perspective view of a fuel cell power generation module. It is a schematic side view of a fuel cell power generation module. It is a heat distribution map of the desulfurizer arrange | positioned at a high temperature area | region.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the overall configuration of the fuel cell power generator 1 will be described.
As shown in FIG. 1, a fuel cell power generation device 1 includes a fuel cell power generation module 2, a reforming air supply device 3, a power generation air supply device 4, a fuel gas supply device 5, an exhaust heat recovery device 6, and pure water supply. The apparatus 7, the power conditioner unit 8, the control unit 9, and the like are provided, and the DC power generated by the fuel cell power generation module 2 is converted into AC power via the power conditioner unit 8 and output to the outside.

  As shown in FIG. 1, the fuel cell power generator 1 is configured by housing various instruments, various pipes, and the like in an outer case 11. Inside the outer case 11 is an upper power generation chamber 11A in which the fuel cell power generation module 2 is accommodated by a frame member 12, auxiliary equipment such as various supply devices 3 to 5, 7 and exhaust heat recovery device 6, and power condition. It is partitioned into a lower auxiliary machine chamber 11B in which the na unit 8, the control unit 9 and the like are housed.

  The fuel cell power generator 1 includes, for example, a hot water storage hot water supply apparatus that stores hot water after heat exchange by the heat exchanger of the exhaust heat recovery apparatus 6, the hot water storage hot water supply apparatus, and the fuel cell power generation apparatus 1. A fuel cell cogeneration system can be configured by combining it with an exhaust heat recovery circuit for circulating hot water, etc., but detailed description of the configuration other than the fuel cell power generator 1 is omitted.

  The reforming air supply device 3 takes in air for fuel reforming from the outside into the reforming air blower, and the taken-in air is supplied to the evaporator of the fuel cell power generation unit 21 via the reforming air passage 13. 21b and the fuel reformer 21c are supplied, and the power generation air supply device 4 takes in the power generation air from the outside into the power generation air blower, and this captured air is generated in the fuel cell via the power generation air passage 14. It supplies to the heat exchanger 21e for air of the part 21 (refer FIG. 2).

  The fuel gas supply device 5 adds hydrogen to a fuel gas from a gas supply source (not shown), takes the fuel gas to which the hydrogen has been added into a fuel booster blower, and uses the boosted fuel gas to desulfurize as will be described later. The fuel is supplied to the evaporator 21b and the fuel reformer 21c of the fuel cell power generation unit 21 through the fuel gas supply passage 15 provided with the vessel 22 (see FIG. 2).

  The exhaust heat recovery device 6 is provided in the middle of the exhaust passage 16 and recovers exhaust heat from the exhaust flowing through the exhaust passage 16 using hot water flowing through the exhaust heat recovery circuit. The pure water supply device 7 collects the condensed water condensed by the exhaust heat recovery device 6, removes impurities from the condensed water, stores the pure water generated from the condensed water, and then stores the pure water through the pure water supply passage 17. It supplies to the evaporator 21b and the fuel reformer 21c of the battery power generation part 21 (refer FIG. 2).

Next, the fuel cell power generation module 2 will be described.
As shown in FIGS. 1 and 2, the fuel cell power generation module 2 includes a fuel cell power generation unit 21, a desulfurizer 22 that removes sulfur in the fuel gas supplied to the fuel cell power generation unit 21, and a fuel cell power generation unit. A rectangular parallelepiped case member 23 and the like made of a thin steel plate containing the desulfurizer 21 and the desulfurizer 22 are provided. Inside the case member 23, a heat insulating material 24 made of gypsum board is accommodated so as to cover the periphery of the fuel cell power generation unit 21 and the desulfurizer 22.

  As shown in FIG. 2, the fuel cell power generation unit 21 includes a fuel cell stack 21a composed of a plurality of fuel cells, an evaporator 21b that generates water vapor for mixing with the fuel gas, fuel gas, air, and water vapor. A fuel reformer 21c that produces a reformed fuel gas by mixing and reacting (so-called steam reforming), an off-gas combustion chamber 21d that combusts the remaining fuel gas generated by power generation by the fuel cell stack 21a, An air heat exchanger 21e heated by the combustion gas in the off-gas combustion chamber 21d is provided, and the reformed fuel gas reformed by the fuel reformer 21c and the air as the oxidant are heated at a high temperature in the fuel cell stack 21a. Power is generated by a chemical reaction in the environment.

  Various instruments of the fuel cell power generation unit 21 are housed in a power generation unit case 21f. The arrangement structure of various instruments will be briefly described. As shown in FIGS. 3 and 4, the evaporator 21b, the fuel reformer 21c, the air heat exchanger 21e, etc. The fuel cell stack 21a is disposed at the lower part. A lower end portion of the power generation unit case 21f is formed so as to protrude outward, and a base table 21g on which the fuel cell stack 21a is placed is accommodated inside the projection of the power generation unit case 21f.

  The exhaust gas discharged from the fuel cell power generation unit 21 is heat-exchanged with the hot water circulating in the exhaust heat recovery circuit in the heat exchanger of the exhaust heat recovery device 6 provided in the exhaust passage 16, and the temperature decreases. And then discharged to the outside. The evaporator 21b generates steam for mixing with fuel gas and supplies it to the fuel reformer 21c. The fuel reformer 21c has a reforming catalyst such as nickel or platinum, and generates a reformed fuel gas by mixing and reacting the desulfurized fuel gas, air, and water vapor.

Next, the desulfurizer 22 will be described.
As shown in FIG. 2, the desulfurizer 22 is for removing (desulfurizing) sulfur compounds contained in the fuel gas supplied to the fuel reformer 21 c, and the heat insulating material 24 inside the case member 23. It is provided in the middle part of the fuel gas supply passage 15 so as to be sandwiched between the two. The desulfurizer 22 is disposed in a high temperature region (for example, about 200 to 320 ° C.) in the vicinity of the fuel cell power generation unit 21 that becomes high temperature during the power generation operation of the fuel cell power generation unit 21.

  As shown in FIG. 3 and FIG. 4, the desulfurizer 22 is provided in the high temperature region in a vertically oriented posture opposite to the fuel cell power generation unit 21 with a heat insulating material 24 interposed therebetween. The upper end portion of the desulfurizer 22 is positioned in the vicinity of the evaporator 21b, the fuel reformer 21c, the air heat exchanger 21e, and the like, and the fuel cell stack 21a extends from the middle stage portion to the lower end portion of the desulfurizer 22. The lower end portion of the desulfurizer 22 is located in the vicinity of the base table 21g with the thin heat insulating material 24 interposed therebetween as compared with other portions. In addition, illustration of the heat insulating material 24 on the opposite side to the fuel cell power generation part 21 of the desulfurizer 22 shown in FIGS. 3 and 5 is omitted.

  The desulfurizer 22 is configured as a rectangular parallelepiped flat box made of a thin steel plate, and stores a high-temperature desulfurizing agent that exhibits performance at high temperatures. The high-temperature desulfurizing agent is a known ultra-high-order desulfurizing agent containing a metal oxide, a metal component-supported oxide, or the like, but the material is not particularly limited as long as it exhibits performance at a high temperature. The ultra-high order desulfurization agent exhibits an excellent desulfurization action at a high temperature of about 200 to 300 ° C. The amount of the desulfurizing agent of the high temperature desulfurizing agent is set to about 1 L, but it is not necessary to limit to the amount of the desulfurizing agent.

  The fuel gas supply passage 15 includes an upstream-side passage portion 15a on the upstream side of the desulfurizer 22, and a downstream-side passage portion 15b on the downstream side of the desulfurizer 22, and the upper end portion of the desulfurizer 22 is connected to the upstream-side passage portion 15a. An inlet 22a through which fuel gas containing sulfur is introduced and an outlet 22b through which fuel gas after desulfurization is led out to the downstream passage portion 15b are provided.

  Inside the desulfurizer 22, a vertical partition plate 22c extending in the vertical direction is provided, and by this partition plate 22c, the upstream side desulfurization agent chamber 22A in the flow direction of the fuel gas flow and the fuel gas flow It is partitioned into a downstream side desulfurization agent chamber 22B on the downstream side in the flow direction. A gap is formed between the lower end of the partition plate 22c and the bottom surface of the desulfurizer 22, and the lower end portion (downstream end portion) of the upstream desulfurizing agent chamber 22A and the lower end portion (upstream end portion) of the downstream desulfurizing agent chamber 22B. ).

  Since the fuel cell power generation unit 21 is in a high temperature state of 700 ° C. or higher during the power generation operation, the desulfurizer is placed in a high temperature region of about 200 to 320 ° C. inside the case member 23 housing the high temperature fuel cell power generation unit 21. By arranging 22, it is possible to maintain a high temperature state in which the reaction of the high temperature desulfurizing agent (super high order desulfurizing agent) becomes active. Since the fuel gas flowing into the desulfurizer 22 contains hydrogen so as to have a concentration of about several percent, the desulfurization action of the super high-order desulfurizing agent is stably exhibited, and the sulfur content in the fuel gas is reduced. Can be efficiently removed.

  The desulfurizer 22 is entirely heated in the high temperature region inside the case member 23, but heat distribution is generated in the high temperature region due to the influence of the arrangement structure of various instruments of the fuel cell power generation unit 21. Will be heated unevenly. That is, in the fuel cell power generation unit 21, the evaporator 21 b, the fuel reformer 21 c, and the air heat exchanger 21 e arranged at the upper part of various instruments have a structure that absorbs the heat of the fuel cell power generation unit 21. On the other hand, since the fuel cell stack 21a and the off-gas combustion chamber 21d arranged in the lower part of the various instruments are heat generating parts, the lower part of the power generation part case 21f is hotter than the upper part. Furthermore, since the heat insulating material 24 becomes the thinnest at the position of the base table 21g, the heat distribution in the high temperature region where the desulfurizer 22 is arranged becomes a heat distribution in which the temperature rises from the upper end to the lower end (FIG. 5). reference).

Next, the heaters 26 and 27 will be described.
As shown in FIGS. 2 and 3, in the case member 23, a heater 26 capable of heating the fuel gas flowing through the upstream passage portion 15 a is installed in the upstream passage portion 15 a of the fuel gas supply passage 15. ing. When the fuel cell power generator 1 is activated, the fuel gas is heated by the heater 26 and supplied to the desulfurizer 22, thereby preventing the performance of the high-temperature desulfurizing agent near the inlet 22 a in the desulfurizer 22 from being deteriorated. .

  As shown in FIG. 3, a flat heater 27 capable of heating the high-temperature desulfurizing agent in the desulfurizer 22 is installed at the lower end of the desulfurizer 22. When the fuel cell power generator 1 is activated, the heater 27 heats the portion where the preheating during the previous power generation operation may remain most (the vicinity of the fuel cell stack 21a or the base table 21f), A high-temperature desulfurization agent that exhibits a desulfurization action at the time of start-up can be quickly secured.

Next, the installation structure of the desulfurizer 22 and the fuel gas supply passage 15 will be described.
As shown in FIGS. 2 and 3, the fuel gas supply passage 15 (upstream passage portion 15 a) upstream of the desulfurizer 22 and a part of the desulfurizer 22 are configured to exchange heat. That is, in the case member 23, most of the upstream side passage portion 15 a of the fuel gas supply passage 15 is arranged in an L shape so as to be along the lower end portion and one side portion of the desulfurizer 22. And is fixed to the fuel gas supply passage 15 and the desulfurizer 22 so that heat exchange is possible.

  Specifically, a part of the desulfurizer 22 is a portion where the flow rate of the fuel gas in the desulfurizer 22 is low (the flow rate of the fuel gas is small) and the fuel gas tends to stay (for example, corners 31a and 31b of the desulfurizer 22). ) And at least one of the high temperature region of the high temperature region where the desulfurizer 22 is installed (for example, the lower end of the desulfurizer 22). That is, a part of the desulfurizer 22 corresponds to a high-temperature portion of the temperature deviation generated in the high-temperature desulfurization agent inside the desulfurizer 22 and may cause sintering in the high-temperature desulfurization agent. doing. The upstream-side passage portion 15 a of the fuel gas supply passage 15 is provided so as to contact the overheated portion of the desulfurizer 22 and exchange heat between the normal temperature fuel gas and the high temperature desulfurizer 22.

Next, the operation and effect of the fuel cell power generator 1 of the present invention will be described.
As shown in FIG. 2, in the desulfurizer 22, the fuel gas introduced from the introduction port 22 a flows downward along the partition plate 22 c in the upstream desulfurizing agent chamber 22 </ b> A, and the upstream desulfurizing agent chamber It flows into the lower end of the downstream side desulfurizing agent chamber 22B from the lower end of 22A through the gap, flows upward in the downstream side desulfurizing agent chamber 22B along the partition plate 22c, and flows from the outlet 22b to the downstream side passage portion 15b. To be derived.

  That is, since the fuel gas flows in a U-shape along the partition plate 22c inside the desulfurizer 22, the fuel gas flowing inside the desulfurizer 22 drifts unevenly and becomes an uneven flow. In particular, in the corners 31a and 31b facing the lower end of the inside of the desulfurizer 22, the flow rate of the fuel gas is remarkably reduced, and the fuel gas may be retained. For this reason, the high-temperature desulfurization agent in the corners 31a and 31b in the desulfurizer 22 may be sintered in a superheated state exceeding the temperature at which the desulfurization action is exerted by gradually increasing the desulfurization agent temperature.

  In the fuel cell power generation module 2 of the present invention, the desulfurizer corresponding to the superheated portion based on the drift of the fuel gas in the desulfurizer 22 and the portion where the flow velocity of the fuel gas is low (corner portions 31a and 31b in the desulfurizer 22). Since the lower end portion of 22 (a part of the desulfurizer 22) can exchange heat with the upstream side passage portion 15a of the fuel gas supply passage 15, the lower end portion of the desulfurizer 22 is cooled by the fuel gas so that the high-temperature desulfurizing agent. Can be cooled to prevent sintering.

  By the way, as shown in FIG. 5, the heat distribution in the high temperature region where the desulfurizer 22 is arranged increases from the upper end portion to the lower end portion of the desulfurizer 22. In particular, since the heat insulating material 24 in the part adjacent to the base 21g is thin and heat is easily transmitted to the desulfurizer 22, the lower end of the desulfurizer 22 may be in the highest temperature state (operating temperature of 340 ° C. or higher). is there. For this reason, the high-temperature desulfurizing agent at the lower end in the desulfurizer 22 may be sintered in a superheated state exceeding the temperature at which the desulfurization action is exerted.

  In the fuel cell power generation module 2 of the present invention, the lower end portion of the desulfurizer 22 (part of the desulfurizer 22) corresponding to the superheated portion based on the heat distribution of the desulfurizer 22 and having a high temperature in the high temperature region. ) Can exchange heat with the upstream-side passage portion 15a of the fuel gas supply passage 15, so that the lower end portion of the desulfurizer 22 is cooled with the fuel gas to cool the high-temperature desulfurizing agent and prevent sintering. it can.

  On the other hand, as shown in FIG. 5, at the upper end of the desulfurizer 22, since the temperature of the heat distribution is low, the desulfurization performance of the high-temperature desulfurizing agent may be lowered. Since the flowing fuel gas is heated by heat transfer from the lower end portion and one side portion of the desulfurizer 22, the temperature of the high-temperature desulfurizing agent in the vicinity of the inlet 22 a at the upper end portion of the desulfurizer 22 can be increased.

  As described above, the fuel cell power generator 1 is configured so that the fuel gas supply passage 15 upstream of the desulfurizer 22 and a part of the desulfurizer 22 exchange heat, so that the fuel gas supply passage 15 A part of the desulfurizer 22 can be cooled by using the fuel gas before flowing into the desulfurizer 22 flowing through the fuel, and the fuel before flowing into the desulfurizer 22 by using the desulfurizer 22 The gas can be heated.

  Therefore, since the desulfurizer 22 arranged in the high temperature region can be cooled using the existing fuel gas supply passage 15, it is not necessary to additionally provide a dedicated member for cooling, and the cost can be reduced and simple. The structure for cooling the desulfurizer 22 can be realized. Further, since the fuel gas before flowing into the desulfurizer 22 can be heated using the desulfurizer 22 disposed in the high temperature region, it is possible to prevent the normal temperature fuel gas from flowing into the desulfurizer 22. It is possible to prevent the desulfurization performance of the desulfurization agent near the inlet inside the desulfurizer 22 from being lowered.

  Further, since the fuel gas supply passage 15 and a part of the desulfurizer 22 corresponding to the portion where the flow speed of the fuel gas in the desulfurizer 22 is low, heat exchange is performed. The portion where the fuel gas stays low and tends to be overheated can be cooled by the fuel gas flowing through the fuel gas supply passage 15.

  Furthermore, since a part of the desulfurizer 22 and the fuel gas supply passage 15 corresponding to a portion where the temperature of the heat distribution in the high temperature region is high is configured to exchange heat, the heat distribution in the high temperature region of the desulfurizer 22 is reduced. Accordingly, the portion that is likely to be overheated can be cooled by the fuel gas flowing through the fuel gas supply passage 15.

Next, a mode in which the above embodiment is partially changed will be described.
[1] In the above embodiment, a part of the desulfurizer 22 corresponding to a portion where the flow rate of the fuel gas in the desulfurizer 22 is low and a part of the desulfurizer 22 corresponding to a portion where the temperature of the heat distribution in the high temperature region is high are However, this is merely an example, and any change can be made as long as the structure is such that the fuel gas supply passage 15 is heat-exchanged in a portion where the desulfurizer 22 is likely to be overheated.

[2] In the above-described embodiment, the desulfurizer 22 is housed inside the case member 23, but is not particularly limited to this portion, and is a high temperature region that becomes high during the power generation operation of the fuel cell power generation unit 21. The desulfurizer 22 may be disposed around the case member 23 and can be changed as appropriate.

[3] In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.

DESCRIPTION OF SYMBOLS 1 Fuel cell power generation apparatus 2 Fuel cell power generation module 15 Fuel gas supply path 21 Fuel cell power generation part 22 Desulfurizer

Claims (3)

A fuel cell power generation unit; a fuel gas supply passage for supplying fuel gas to the fuel cell power generation unit; and a desulfurizer for removing sulfur in the fuel gas; In the fuel cell power generator in which the desulfurizer is disposed in a high temperature region that becomes:
A fuel cell power generator configured to exchange heat between the fuel gas supply passage upstream of the desulfurizer and a part of the desulfurizer.   The part of the desulfurizer corresponding to a portion where the flow rate of the fuel gas in the desulfurizer is low is configured to exchange heat with the fuel gas supply passage. Fuel cell power generator.   2. The fuel cell according to claim 1, wherein a part of the desulfurizer corresponding to a portion where the temperature of heat distribution in the high temperature region is high is configured to exchange heat with the fuel gas supply passage. 3. Power generation device.