JP5041666B2 - Fuel cell power generation system - Google Patents

Description

  The present invention relates to a fuel cell power generation system using a hydrogen generator that generates hydrogen gas obtained by reforming a hydrocarbon-based fuel.

  In addition to high power generation efficiency, fuel cell power generators can effectively use heat generated during power generation, and are expected to be applied to household cogeneration.

  In home use, it is desirable to operate the fuel cell power generator at a relatively low temperature from the viewpoint of responding to frequent start / stop of the apparatus, durability of the apparatus, and cost reduction. Therefore, development of a polymer electrolyte fuel cell using a polymer electrolyte membrane as a power generation city is underway.

  Many fuel cells generate electricity using hydrogen as fuel. At present, the hydrogen gas infrastructure that serves as the fuel is not in place, so at the place where the power generation equipment is installed, organic gas composed of at least carbon and hydrogen such as natural gas, hydrocarbon components such as LPG, alcohol such as methanol, or naphtha components A hydrogen generator for generating a reformed gas containing hydrogen by reacting a raw material containing a compound with water is used in combination. In addition to hydrogen, carbon dioxide and carbon monoxide (hereinafter referred to as CO) derived from the raw materials are included as subcomponents in the generated reformed gas. Since the polymer electrolyte fuel cell currently under development operates at a low temperature of 100 ° C. or lower, CO contained in the reformed gas is reduced as much as possible (generally 10% to maintain the activity of the battery electrode catalyst). ~ 50 ppm or less). Therefore, in the hydrogen generator, a reforming section that generates a hydrogen-rich reformed gas from raw material and water, a carbon monoxide shift section that shifts CO and water in the reformed gas, and CO are selectively oxidized. It consists of a carbon monoxide selective oxidation part to be reacted.

  FIG. 4 shows the configuration of a fuel cell power generation system having such a hydrogen generator. In FIG. 4, a raw material supply unit 21 is a unit for supplying a raw material to be reformed, and a water supply unit 22 is a unit for supplying water necessary for the reforming reaction, both of which are reforming units filled with a reforming catalyst. 23.

  The reformer 23 is provided with a burner 24 that burns the fuel supplied from the fuel supply unit 25 and the air supplied from the combustion air supply unit 26 to heat the reformer 23. The reformed gas sent from the reforming unit 23 is sent to the carbon monoxide conversion unit 27 filled with the conversion catalyst.

  The reformed gas that has undergone the shift reaction in the carbon monoxide shift section 27 is sent to the carbon monoxide selective oxidation section 28 that is filled with the CO oxidation catalyst and includes the CO oxidation air supply section 226, and is produced in a hydrogen rich state with a low CO concentration. The gas is sent from the carbon monoxide selective oxidation unit 28 to the fuel cell 29.

  By the way, the reforming unit 23, the carbon monoxide conversion unit 27, and the carbon monoxide selective oxidation unit 28 are filled with a catalyst body suitable for each reaction, and the predetermined efficiency is high and the apparatus operates stably. Controlled by temperature. Although the optimum temperature differs depending on the catalyst used and the use conditions, the reforming unit 23 is 500 ° C. to 700 ° C., the carbon monoxide conversion unit 27 is 150 ° C. to 400 ° C., and the carbon monoxide selective oxidation unit 28 is 100 ° C. to 200 ° C. Operate with. A high-temperature reformed gas is introduced from the reforming unit 23 to the carbon monoxide conversion unit 27 and the carbon monoxide selective oxidation unit 28, but as described above, the reformed unit 23 is less than the optimum temperature of the reforming unit 23. Since the optimum temperatures of the carbon oxide shift unit 27 and the carbon monoxide selective oxidation unit 28 are low, it is necessary to keep them at an appropriate temperature.

  Therefore, a conversion temperature detection unit 210 that detects the temperature of the carbon monoxide conversion unit 27, a conversion cooling unit 211 having a conversion cooling fan 212 so that the surroundings of the carbon monoxide conversion unit 27 can be air-cooled, and a conversion temperature detection unit. 210 and a conversion cooling fan control unit 216 in which the conversion cooling fan 212 is connected to each other, and the conversion cooling fan control unit 216 controls the conversion cooling fan 212 based on a signal from the conversion temperature detection unit 210, and the carbon monoxide conversion unit 27. Adjust so that the temperature is appropriate.

  Also, a CO oxidation temperature detection unit 213 that detects the temperature of the carbon monoxide selective oxidation unit 28, and a CO oxidation cooling unit 214 that has a CO oxidation cooling fan 215 so that the periphery of the carbon monoxide selective oxidation unit 28 can be air-cooled. , A CO oxidation cooling fan control unit 217 that connects the CO oxidation temperature detection unit 213 and the CO oxidation cooling fan 215 is installed, and the CO oxidation cooling fan control unit 217 uses the CO oxidation cooling fan 215 in response to a signal from the CO oxidation temperature detection unit 213. The CO concentration is reduced by controlling the carbon monoxide selective oxidation unit 28 so as to have an appropriate temperature.

  Thus, the air from each cooling fan used for the temperature adjustment of the carbon monoxide shift section 27 and the carbon monoxide selective oxidation section 28 is discharged out of the equipment. This air is in a high temperature state due to heat exchange in the metamorphic cooling unit 211 and the CO oxidation cooling unit 214.

  However, exhausting the air outside the device will dissipate the exhaust heat generated by the device to the outside, so that the heat is not effectively used, and the heat utilization efficiency of the fuel cell power generation system is low It becomes a thing. In order to solve such a problem, the following technologies have been proposed as technologies that use exhaust heat.

  FIG. 5 is a configuration example in which exhaust heat generated during cooling of the carbon monoxide selective oxidation unit 28 and the carbon monoxide conversion unit 27 is reused in order to improve the efficiency of the reforming unit 23 (for example, Patent Documents). 1). In FIG. 5, the same or corresponding parts as in FIG. In addition, the cooling air duct 221 uses the air that has been sent by the transformation cooling fan 212 and passed through the transformation cooling unit 211 and the air that has been sent by the CO oxidation cooling fan 215 and passed through the CO oxidation cooling unit 214 to the intake port of the combustion air fan 218. It is a means for guiding to the vicinity.

By adopting such a configuration, the air that has been supplied with the exhaust heat and supplied by the shift cooling fan 212 or the CO oxidation cooling fan 215 and passed through the shift cooling unit 211 or the CO oxidation cooling unit 214 is transferred to the combustion air fan 218. It is discharged near the suction port. The combustion air fan 218 sucks the air whose temperature has increased and supplies it to the burner 24. The burner 24 burns to form a flame, but the flame temperature rises by the amount of increase in the temperature of the combustion air, the amount of heating of the reforming section 23 by the burner 24 increases, and the heating of the reforming section 23 is further increased. Can be done efficiently. Thereby, the heat loss due to the exhaust heat escaping outside the crisis can be eliminated, and the heat of the cooling section can be used more effectively.
JP 2003-212509 A

  However, the conventional fuel cell power generation system shown in FIG. 5 has the following problems. That is, in the operation of the burner 24, when the combustion air temperature changes, the volume of the combustion air changes. Therefore, the amount of air converted to a constant temperature supplied by the combustion air fan 218 even at the same rotational speed changes. Therefore, in the combustion fan control unit 220, necessary combustion is determined from the amount of air necessary for combustion in the burner 24 from the fuel supply amount based on the signal from the fuel supply unit 25 and the combustion air temperature from the combustion air temperature detection unit 219. The rotational speed of the air fan 218 is calculated and controlled.

  At this time, the air recovered by the combustion air fan 218 is actually the conversion cooling fan 212 and the CO oxidation cooling fan that carry outside air and exhaust heat from the carbon monoxide selective oxidation unit 28 and the carbon monoxide conversion unit 27. It becomes an air-fuel mixture with the exhaust from 215. Since the temperature and volume of the exhaust from each cooling fan vary depending on the operating states of the carbon monoxide selective oxidation unit 28 and the carbon monoxide conversion unit 27, the temperature and volume of the air-fuel mixture also vary in real time. Accordingly, the combustion fan control unit 220 follows this variation, and it may be difficult to calculate the effective rotational speed, and it is actually difficult to operate the burner 24 efficiently. Further, the installation of the combustion air temperature detection unit 219 and the configuration of the combustion fan control unit 220 corresponding thereto make the entire system expensive.

  The present invention has been made in view of such a problem, and provides a fuel cell power generation system that has a simpler configuration, has an excellent heat recovery rate, and can reliably improve operation efficiency. With the goal.

In order to achieve the above object, the first aspect of the present invention comprises a reforming unit that reacts a raw material with water to generate a reformed gas containing at least hydrogen and carbon monoxide. A hydrogen generator having at least a carbon monoxide selective oxidation unit for removing carbon monoxide in the reformed gas discharged, and a cooling means for air-cooling the carbon monoxide selective oxidation unit;
A fuel cell that is provided above the hydrogen generator and generates power using a hydrogen-rich gas discharged from the carbon monoxide selective oxidation unit;
A plate having a collision surface between the hydrogen generation device and the fuel cell and disposed at least above the hydrogen generation device, on which a flow of air discharged from the cooling means collides ,
In the periphery of the plate, there is a fuel cell power generation system in which there is a space for communication between the hydrogen generator and the fuel cell .

The second aspect of the present invention provides the hydrogen-rich gas introduction pipe that connects the carbon monoxide selective oxidation unit and the fuel cell, and through which the hydrogen-rich gas passes, in the vicinity of the end of the plate. The fuel cell power generation system according to the first aspect of the present invention.

The third aspect of the present invention is the fuel cell power generation system according to the first or second aspect of the present invention, wherein the discharge port for discharging the air of the cooling means is provided on the side close to the reforming unit. is there.

According to a fourth aspect of the present invention, there is provided an outer peripheral portion on the opposite side of the outer peripheral portion of the carbon monoxide selective oxidation portion to which the discharge port for discharging the air of the cooling means is connected to the hydrogen rich gas introduction pipe. It is the fuel cell power generation system of the 2nd this invention provided in the position of this.

In the fifth aspect of the present invention, the hydrogen generator is provided between the reforming unit and the carbon monoxide selective oxidation unit, and the monoxide in the reformed gas discharged from the reforming unit. A carbon monoxide shifter for removing carbon by a shift reaction;
The fuel cell power generation system according to the first aspect of the present invention, wherein a reformed gas passage pipe that connects the reformer and the carbon monoxide shifter and through which the reformed gas passes is disposed in the vicinity of the plate. It is.

Further, in the sixth aspect of the present invention, the reforming unit has an evaporation unit for evaporating the water therein,
The evaporation unit is the fuel cell power generation system according to the first aspect of the present invention, which is disposed in the reforming unit so as to be close to the plate.

The seventh aspect of the present invention includes a bottom plate that is provided below the hydrogen generator, and that faces the plate through the hydrogen generator,
In the fuel cell power generation system according to the first aspect of the present invention, the plate, the bottom plate, and the hydrogen generator are integrated to form a unit that is removable from the fuel cell power generation system.

  According to the present invention as described above, it is possible to provide a fuel cell power generation system that has a simple configuration, has an excellent heat recovery rate, and can reliably improve the operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a configuration diagram of a fuel cell power generation system according to Embodiment 1 of the present invention. As shown in FIG. 1, the raw material supply unit 1 is a means for supplying a raw material to be reformed, and the water supply unit 2 is a means for supplying water necessary for the reforming reaction, both of which are filled with a reforming catalyst. It is connected to the reforming unit 3. The reforming unit 3 is a means for generating a reformed gas containing hydrogen and carbon monoxide (hereinafter referred to as CO) by a reforming reaction, and a fuel supplied from the fuel supply unit 4 and a combustion air supply are provided on the bottom surface thereof. A burner 6 is installed that burns with the air supplied from the unit 5 and heats the reforming unit 3. Further, an evaporation unit 7 for evaporating the water supplied from the water supply unit 2 is provided inside the reforming unit 3. In FIG. 1, the reforming unit 3 is shown as a schematic transmission diagram in order to show the evaporation unit 7.

  The carbon monoxide shifter 8 is means for removing CO from the reformed gas generated in the reformer 3 by a shift reaction, and is connected to the reformer 3 and the reformed gas passage pipe 9.

  The carbon monoxide selective oxidation unit 10 is a means for removing CO from the reformed gas filled with a CO oxidation catalyst and having a CO oxidation air supply unit 11 and discharged from the carbon monoxide conversion unit 8 by an oxidation reaction. is there. The reformed gas discharged from the carbon monoxide selective oxidation unit 10 is sent to the fuel cell 12 as a hydrogen-rich product gas having a sufficiently reduced CO concentration. The fuel cell 12 and the carbon monoxide selective oxidation unit 10 are connected by a hydrogen rich gas introduction pipe 13.

  Further, an offgas return pipe 14 for returning offgas discharged from the fuel cell 12 to the burner 6 is provided so as to connect the fuel cell 12 and the burner 6. The off-gas return pipe 14 is joined with the fuel supply unit 4.

  Further, cooling means for maintaining the optimum temperature of the carbon monoxide selective oxidation unit 10 is provided. The cooling means includes a cooling fan 15 for introducing outside air, and carbon monoxide selective oxidation of the outside air sucked by the cooling fan 15. The cooling cylinder 16 is configured to flow around the portion 10, and the discharge port 17 for releasing the air discharged from the cooling cylinder 16 to the outside. The cooling fan 15 is controlled by detecting the temperature of the carbon monoxide selective oxidation unit as in the conventional example, but the configuration for that purpose is not shown. As the cooling fan control method, an optimum method may be selected depending on the type of fan, such as ON-OFF control and PID control.

  As shown in FIG. 1, in the fuel cell power generation system of the first embodiment, the reforming unit 3, the carbon monoxide conversion unit 8, the carbon monoxide selective oxidation unit 10 and the pipes connecting them are a hydrogen generator. The fuel cell 12 is positioned at the top of this hydrogen generator. The hydrogen generator and the fuel cell 12 are packaged by a housing 18. The bottom of the housing 18 is open, and the inside and outside of the housing 18 communicate with each other. Each means that requires inflow of outside air in the hydrogen generator such as the cooling fan 15 takes in outside air through the bottom of the housing 18. In the drawing, a thick arrow shown outside the housing 18 indicates the top-and-bottom relationship of the installation state of the fuel cell power generation system. Moreover, the thin arrow shown in the housing | casing 18 shows the direction of flows, such as a raw material and reformed gas, when the fuel cell power generation system is operating.

  The fuel cell power generation system of Embodiment 1 is characterized in that a plate 19 is provided between the hydrogen generator and the fuel cell 12. FIG. 2 is a schematic top view of the fuel cell power generation system. 2, the same reference numerals are given to the same or corresponding parts as in FIG. 1, and the detailed description is omitted. Also, only the configuration necessary for simplicity is shown.

  Hereinafter, further description will be given with reference to FIGS. 1 and 2. The plate 19 is made of a material having thermal conductivity such as aluminum, iron plate, non-ferrous metal, etc., and in the housing 18, the space in which the fuel cell 12 is disposed and the space in which the hydrogen generator is disposed are isolated. To be arranged. However, the plate 19 may be disposed substantially just above the hydrogen generator. That is, as shown in FIG. 2, the area of the plate 19 is smaller than the area of the upper surface of the housing 18 and covers the upper portions of the containers of the reforming unit 3, the carbon monoxide conversion unit 8, and the carbon monoxide selective oxidation unit 10. It is about the size. Thereby, the space in which the fuel cell 12 is disposed communicates with the space in which the hydrogen generator is disposed, and the entire interior of the fuel cell power generation system can maintain communication with the outside.

  Further, both ends of the hydrogen rich gas introduction pipe 13 are arranged so as to be located in the plane of the plate 19. Accordingly, the hydrogen rich gas introduction pipe 13 connects the fuel cell 12 and the carbon monoxide selective oxidation unit 10 so as to wrap around the end portion of the plate 19 and turn around.

  Further, the discharge port 17 constituting the cooling means is opened so as to face the main surface of the plate 19.

The operation of the fuel cell power generation system according to Embodiment 1 of the present invention having the above-described configuration is basically the same as that of the conventional example. That is, the fuel supplied from the fuel supply section 4, the burner 6 heats the reforming unit 3 by the supplied et or combustion air supply unit 5 air, the raw material from the raw material supply unit 1, also the water supply section 2 Then, water is supplied to the reforming unit 3 from each, and the reformer generates reformed gas containing hydrogen and CO. The reformed gas sent from the reforming section 3 is sent to the carbon monoxide shift section 8 through the reformed gas passage pipe 9. The CO concentration in the reformed gas is reduced by the shift reaction in the carbon monoxide shift section 8 and further reduced by the oxidation reaction in the carbon monoxide selective oxidation section 28. A hydrogen rich gas having a low CO concentration is introduced from the carbon monoxide selective oxidation unit 10 into the fuel cell 12 as a fuel gas. The fuel cell 12 generates power using a hydrogen-rich gas and an oxidizing gas (the supply source is not shown), and the discharged off-gas returns to the burner 6 through the off-gas return pipe 14 and is reused as combustion gas.

  In the above operation, as in the conventional example, in order to operate the carbon monoxide selective oxidation unit 10 at an optimum temperature lower than that of the reforming unit 3, the cooling fan 15 is operated and the outside air introduced from the bottom of the system is cooled by the cooling cylinder 16. The carbon monoxide selective oxidation part 10 is air-cooled by letting it pass in.

  At this time, the air carrying the exhaust heat (80 ° C. to 100 ° C.) generated from the carbon monoxide selective oxidation unit 10 is exhausted from the exhaust port 17, so that the exhaust port 17 faces the main surface of the plate 19. Since it is provided, the flow of the discharged air collides with the main surface of the plate 19 as the collision surface, moves to the end along this, and then diffuses into the space where the fuel cell 12 is disposed.

  Thereby, the air carrying the exhaust heat forms a high-temperature air layer in the upper part of the hydrogen generator. As shown in FIG. 1, the canopy portions of the reforming unit 3 and the carbon monoxide conversion unit 8 are exposed to this air layer. Further, the reformed gas passage pipe 9 that connects the reforming unit 3 and the carbon monoxide conversion unit 8 has both ends connected to the upper surfaces of the reforming unit 3 and the carbon monoxide conversion unit 8. Similarly, it will be exposed to a hot air layer. This produces the following effects. That is, each part constituting the hydrogen generator such as the reforming unit 3 has a structure in which the outer wall is covered with a heat insulating material in order to prevent internal heat insulation and heat dissipation to the outside, but there is still a temperature difference with the outside. Because of its large size, heat dissipation to the outside occurs.

  On the other hand, according to the present embodiment, the atmosphere in which the hydrogen generator is arranged can be raised to a high temperature by raising the temperature of the outside air itself using the exhaust heat from the cooling means. Thereby, the temperature difference between the inside and the outside of the reforming unit 3 or the like can be further reduced, and heat radiation to the outside can be prevented.

  Moreover, since the heat insulating material can be reduced if the heat radiation amount is the same, the apparatus can be made more compact.

  Furthermore, since the plate 19 itself has thermal conductivity, radiant heat is generated by being exposed to the air discharged from the outlet 17 and being heated. The heating effect by this can also be acquired simultaneously.

  In particular, the reformed gas passage pipe 9 has a smaller volume than the reforming section 3 and the carbon monoxide conversion section 8, and therefore a large amount of heat insulating material could not be used. However, this embodiment can be suppressed.

  In addition, the fuel cell 12 and the hydrogen-rich gas introduction pipe 13 are also placed in a high-temperature atmosphere by the air that has reached the top from the end of the plate 19. In this case, the temperature of the air reaching the fuel cell 12 is lowered by heat transfer to the plate 19 and diffusion into the space, and the fuel cell 12 is heated or kept at a temperature of about 70 ° C.

  The fuel cell 12 generates heat during power generation, and its heat is used for hot water supply through cooling water. Therefore, more heat can be used for hot water supply by heating or keeping the fuel cell warm. Further, by bringing the external temperature close to the operating temperature of the fuel cell 12, the temperature distribution in the fuel cell 12 can be reduced, and the humidified state of the fuel cell can be made more uniform.

  Moreover, the following effects are also obtained by placing the hydrogen rich gas introduction pipe 13 in a high temperature atmosphere. That is, as described above, the optimum temperature in the carbon monoxide selective oxidation unit 10 is 100 ° C. to 200 ° C., and the exhausted hydrogen-rich gas is at the same high temperature (100 ° C.). Is usually supplied at around 70 ° C. When the external temperature is low, the water contained in the hydrogen rich gas as water vapor condenses in the carbon monoxide selective oxidation unit 10 and is condensed in the hydrogen rich gas introduction pipe 13. When the amount of moisture to be condensed increases, the water flows backward to the carbon monoxide selective oxidation unit 10 and bumps inside. This may cause malfunction of the carbon monoxide selective oxidation unit 10 and combustion abnormality of the burner 6 that uses off-gas after passing through the fuel cell 12. On the other hand, in this embodiment, by placing the periphery of the hydrogen rich gas introduction pipe 13 in a high temperature atmosphere, the temperature in the hydrogen rich gas introduction pipe 13 is increased, and dew condensation that occurs inside when the hydrogen rich gas passes is suppressed. It becomes possible. Further, even when the temperature of the carbon monoxide selective oxidation unit 10 is high, as shown in FIGS. 1 and 2, without passing through the plate 19 so as to be kept at an appropriate temperature (near the operating temperature of the fuel cell 12). It is more desirable to provide a long detour.

  Furthermore, since the plate 19 is provided as a flat plate member directly above the hydrogen generator, the flow of air discharged from the discharge port 17 is planar along the main surface of the plate 19 shown in FIG. Spread. Thereby, the temperature distribution of the exhaust heat in the housing | casing 18 can be closely approximated, and local overheating can be prevented.

  Further, as shown in FIG. 1, the evaporation unit 7 is provided in the vicinity of the ceiling in the reforming unit 3, but it is desirable that this arrangement is also provided in the vicinity of the plate 19. Thereby, it becomes possible to preheat the water | moisture content of the evaporation part 7 using the radiant heat from the board 19. FIG. The inside of the reforming unit 3 can be maintained at a higher temperature in combination with the heat retaining effect at the upper part of the reforming unit 3. ) Can be reduced.

  In the cooling means, the discharge port 17 is provided on the side close to the reforming unit 3. Thereby, the exhausted air can be efficiently distributed to the reforming unit 3 side that is the target of heating and heat insulation. The cooling cylinder 16 and the carbon monoxide selective oxidation unit 10 provided with the discharge port 17 have a double cylindrical structure arranged coaxially. However, the arrangement of the discharge port 17 in the cooling cylinder 16 and It is point-symmetric with respect to the connection position of the hydrogen-rich gas introduction pipe 13 in the carbon oxide selective oxidation part 10 and is arranged so that at least the discharge port 17 and the connection part are not close to each other. As a result, the hydrogen rich gas introduction pipe 13 is overheated by direct heating of the exhaust air, and prevents the hydrogen rich gas that has become unnecessarily high from being introduced into the fuel cell 12.

  As described above, according to the fuel cell power generation system of the present embodiment, the fuel cell 12 is disposed in the upper part of the housing 18, and the hydrogen generation device including the reforming unit 3 and the like is disposed in the lower part. By providing the plate 19, the hydrogen generator, the fuel cell 12 and the hydrogen rich gas introduction pipe 13 centering on the reforming unit 3 are heated and kept warm by the exhaust air from the cooling means of the carbon monoxide selective oxidation unit 10. The temperature conditions of these parts can be optimized, and the operating efficiency of the entire system can be improved. In particular, since the temperature change obtained by the high-temperature atmosphere formed by the exhaust air and the radiant heat from the plate 19 is obtained as a relatively static one, the reforming unit 3, the carbon monoxide conversion unit 8, the carbon monoxide selective oxidation Special sensors that take into account changes in the temperature of the exhaust air are installed and new algorithms are set to control the control conditions of the burner 6 based on the temperature state of the unit 10, the cooling fan 15 and other fans, and heating means. As a result, the construction of a low-cost system can be realized. In addition, since the combustion air supply unit 5, the cooling fan 15, the CO oxidation air supply unit 11 and the like are all provided below the casing 18, the outside air in a constant temperature state is not affected by the heat generation of the hydrogen generator or the fuel cell. It is also possible to allow the system to perform stable operation.

(Embodiment 2)
FIG. 3 is a configuration diagram of the fuel cell power generation system according to Embodiment 2 of the present invention. In FIG. 3, the same or corresponding parts as in FIG. The fuel cell power generation system of this embodiment includes a raw material supply unit 1, a water supply unit 2, a reforming unit 3, a fuel supply unit 4, a combustion air supply unit 5, a burner 6, and a carbon monoxide selection that constitute a hydrogen generator. Below the oxidation unit 10 and its cooling means, the carbon monoxide transformation unit 8, and the pipes connecting these, the bottom plate 20 disposed so as to face the plate 19, and the connection connecting the plate 19 and the bottom plate 20 The difference is that the member 30 is provided. The plate 19, the connecting member 30, and the bottom plate 20 function as a bowl-shaped member for housing each part constituting the hydrogen generating device, and the hydrogen generating device, the plate 19, the connecting member 30, and the bottom plate 20 are integrally fixed. The unit 31 is configured. In addition, although illustration was abbreviate | omitted, the baseplate 20 should just be connected with the wall surface in the housing | casing 18, and it is not necessary to contact an installation place in the state in which the fuel cell power generation system is installed.

  The operation and effect of the fuel cell power generation system of the second embodiment having such a configuration is the same as that of the first embodiment, but further, the hydrogen rich gas introduction pipe 13 and the off-gas necessary for connection to the fuel cell 12 are used. By releasing the connection with the return pipe 14, the entire unit 31 can be removed from the housing 18. Thereby, the portability of only the hydrogen generator in the fuel cell power generation system can be improved, and maintenance, replacement, and the like can be easily performed.

  In each of the above embodiments, the reforming unit 3 corresponds to the reforming unit of the present invention, the carbon monoxide conversion unit 8 corresponds to the carbon monoxide conversion unit of the present invention, and the carbon monoxide selective oxidation unit. 10 corresponds to the carbon monoxide selective oxidation part of the present invention, the fuel cell 12 corresponds to the fuel cell of the present invention, and the evaporation part 7 corresponds to the evaporation part of the present invention. Moreover, the cooling means comprised from the cooling fan 15, the cooling cylinder 16, and the discharge port 17 is corresponded to the cooling means which performs the cooling by the air cooling of this invention. The plate 19 corresponds to the plate of the present invention.

  However, the present invention is not limited to the above embodiments. For example, in the first embodiment, the hydrogen generator is shown with the reformer 3, the carbon monoxide shifter 8 and the carbon monoxide selective oxidizer 10 as the main parts. However, the hydrogen generator of the present invention is at least a reformer. It is only necessary to include the unit 3, the carbon monoxide selective oxidation unit 10 and its cooling means, the carbon monoxide conversion unit 8 is omitted, and the reforming unit 3 and the carbon monoxide selective oxidation unit 10 are directly connected. It is good also as a structure. Further, although the carbon monoxide shifter 8 has been described as having no cooling means, a cooling means by air cooling having the same configuration as the carbon monoxide selective oxidizing part 10 may be provided. In this case as well, it is desirable that the intake fan is disposed below the housing 18 and the exhaust air from the exhaust port collides with the plate 19.

  In the first embodiment, as shown in FIG. 1, as the collision surface of the present invention, the main surface of the plate 19 on which the air flow discharged from the discharge port 17 collides faces the discharge port 17. Although the air flow collides substantially at a right angle, the opening surface of the discharge port 17 is obliquely intersected with the plate 19 and the exhaust air flow is caused to collide obliquely with the main surface of the plate 19. You may do it. Specifically, the discharge port 17 may be formed by slanting the pipe, sloping the cut end of the pipe, or the like.

  Further, as shown in FIG. 2, the plate 19 is large enough to cover the upper surfaces of the reforming unit 3, the carbon monoxide conversion unit 8, and the carbon monoxide selective oxidation unit 10, However, the plate is provided substantially immediately above each means that can constitute the hydrogen generator of the present invention, and the space in which the fuel cell is arranged and the hydrogen generation Any device can be used as long as it can be isolated from the space in which the device is arranged, and is not limited by the material, shape, and size thereof. Moreover, in order to adjust the flow of air, the structure provided with the through-hole in one part may be sufficient, and it is good also as a structure provided with the fin for improving the heat retention power or rectifying | straightening an air flow on the surface. You may be comprised with the corrugated sheet. A non-metallic material such as ceramic may be used, or a material having low thermal conductivity may be used. In short, any structure that can rectify and diffuse the air discharged from the cooling means may be used.

In the second embodiment, as shown in FIG. 3, in the fuel cell power generation system, the unit 31 is shown as including all the parts other than the fuel cell 12, but the hydrogen generator of the present invention is at least modified. Since the material part 3, the carbon monoxide selective oxidation part 10, the cooling fan 15, the cooling cylinder 16, and the discharge port 17 only have to be configured, the other parts, that is, the raw material supply part 1, the water supply part 2, etc. The configuration may be such that it is excluded from 31 and fixed to the housing 18 side.

  INDUSTRIAL APPLICABILITY The present invention has a simple configuration, an excellent heat recovery rate, and an effect that can surely improve the operation efficiency, and is particularly useful as a fuel cell power generation system.

1 is a configuration diagram of a fuel cell power generation system according to Embodiment 1 of the present invention. FIG. 1 is a schematic plan view of a main part of a fuel cell power generation system according to Embodiment 1 of the present invention. It is a block diagram of the fuel cell power generation system by Embodiment 2 of this invention. It is a block diagram of the fuel cell power generation system by a prior art. It is a block diagram of the other example of the fuel cell power generation system by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Raw material supply part 2 Water supply part 3 Reformation part 4 Fuel supply part 5 Combustion air supply part 6 Burner 7 Evaporation part 8 Carbon monoxide transformation part 9 Reformed gas passage piping 10 Carbon monoxide selective oxidation part 11 CO oxidation air supply Part 12 Fuel cell 13 Hydrogen rich gas introduction pipe 14 Off gas return pipe 15 Cooling fan 16 Cooling cylinder 17 Discharge port 18 Housing 19 Plate

Claims (7)

A reforming unit that reacts a raw material with water to generate a reformed gas containing at least hydrogen and carbon monoxide, and that removes carbon monoxide in the reformed gas discharged from the reforming unit. A hydrogen generator having at least a carbon oxide selective oxidation unit and a cooling means for air-cooling the carbon monoxide selective oxidation unit;
A fuel cell that is provided above the hydrogen generator and generates power using a hydrogen-rich gas discharged from the carbon monoxide selective oxidation unit;
A plate having a collision surface between the hydrogen generation device and the fuel cell and disposed at least above the hydrogen generation device, on which a flow of air discharged from the cooling means collides ,
A fuel cell power generation system having a space around the plate for communicating between the hydrogen generator and the fuel cell . Said connecting carbon monoxide selective oxidation unit and the fuel cell, hydrogen-rich gas inlet conduit of the hydrogen-rich gas passes is provided so as to pass through the vicinity of an end portion of the plate, according to claim 1 Fuel cell power generation system. 3. The fuel cell power generation system according to claim 1, wherein a discharge port for discharging the air of the cooling unit is provided on a side close to the reforming unit. The exhaust port for discharging the air of the cooling means is provided at a position of an outer peripheral portion opposite to the outer peripheral portion of the carbon monoxide selective oxidation portion to which the hydrogen rich gas introduction pipe is connected. Item 3. The fuel cell power generation system according to Item 2 . The hydrogen generator is provided between the reforming unit and the carbon monoxide selective oxidation unit, and removes carbon monoxide in the reformed gas discharged from the reforming unit by a shift reaction. A carbon metamorphosis unit,
The fuel cell power generation system according to claim 1, wherein a reformed gas passage pipe that connects the reformer and the carbon monoxide shifter and through which the reformed gas passes is disposed in the vicinity of the plate. . The reforming unit has an evaporation unit for evaporating the water inside,
2. The fuel cell power generation system according to claim 1, wherein the evaporation unit is disposed in the reforming unit so as to be close to the plate. Provided below the hydrogen generator, comprising a bottom plate facing the plate and the hydrogen generator;
The fuel cell power generation system according to claim 1, wherein the plate, the bottom plate, and the hydrogen generator are integrated to form a unit that is detachable from the fuel cell power generation system.

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