JP2011228171A - Fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell in which joinability and gas sealability of laminating auxiliary equipment using a metal frame can be secured at the same time.SOLUTION: In an solid oxide fuel cell 1, in order to configure a combustor 7 and a reformer 9, first to fourth gas seal parts 76 to 79 are laminated and arranged between first to fifth metal frames 71 to 75, and those metal frames and gas seal parts(together with a fuel cell stack 5) are pressed, fastened and fixed in a lamination direction using first to eighth fastening members 111 to 118. Accordingly, when fastened, the first to fourth gas seal parts 76 to 79 are deformed on a contact surface in preference (to respective metal frames 71 to 75), and improve adhesion to respective metal frames 71 to 75. As a result, even while maintaining the gas sealability, a laminated structure in which soldering is eliminated can be achieved.

Description

  The present invention relates to a fuel cell that uses an oxidant gas and a fuel gas and includes various auxiliary devices that preheat these gases, for example.

Conventionally, as a fuel cell, a solid oxide fuel cell (hereinafter also referred to as SOFC) using a solid oxide as an electrolyte is known.
In this SOFC, for example, a stack (fuel cell stack) is formed by stacking a large number of fuel cells each having a fuel electrode and an air electrode on each surface of a plate-shaped solid electrolyte body, and fuel gas is supplied to the fuel electrode. In addition, air is supplied to the air electrode, and electric power is generated by causing a chemical reaction between the fuel and oxygen in the air via the solid electrolyte body.

Since this solid oxide fuel cell is operated at a high temperature of 600 to 1000 ° C., a structure for maintaining the operating temperature of the solid oxide fuel cell is required.
For example, in Patent Document 1 below, a fuel cell stack is reformed with a heat exchange layer for heating air supplied from the outside or fuel gas (mainly city gas, natural gas, etc.) supplied from the outside. For this reason, a structure in which an auxiliary layer (stacking auxiliary device) such as a modified layer is sandwiched and integrated is disclosed.

  Patent Document 2 below discloses a configuration in which a stacking auxiliary device is formed by stacking a plurality of plate-shaped metal frames and integrating them by brazing.

Japanese Patent Laid-Open No. 7-136315 JP 2009-93923 A

  However, in the technique of the above cited reference 2, there is a problem that it is not easy to simultaneously secure the coupling between the metal frames and the gas seal between the metal frames by brazing.

  In other words, when brazing between metal frames, it is necessary to braze over the entire surface of the metal frame, but metal frame materials are usually slightly curved in the manufacturing process, so multiple metal frames are in close contact. It was not easy to braze completely.

In addition, since the metal frame itself is processed into a complicated shape in order to form a complicated gas flow path, it is not easy to braze the metal frames together from this point.
For this reason, there is a problem that it is not easy to ensure reliable coupling and gas sealing properties between metal frames.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a fuel cell that can simultaneously ensure the binding property and gas sealing property of a stacking auxiliary device using a metal frame.

  (1) According to the present invention, as described in claim 1, in the power generation reaction of the fuel cell, preheating of oxidant gas or fuel gas, combustion of residual fuel gas after power generation, liquid raw material for generating fuel gas A fuel cell having a stacking auxiliary device having at least one function among the functions of gasification and fuel gas reforming and stacking a plurality of plate-like metal frames, The auxiliary device is interposed between the two adjacent metal frames, and is laminated with the metal frame and has a plate-like gas seal portion having a lower strength than the metal frame, and the metal frame and the gas seal portion in the stacking direction. And a fastening member that is fastened to be fixed.

In the present invention, the gas seal portions are stacked and arranged between the metal frames, and they are pressed and fixed in the stacking direction using a fastening member.
Therefore, when the gas seal portion is tightened by the fastening member, the gas seal portion is preferentially deformed (rather than the metal frame) on the contact surface, and the adhesion with the metal frame is improved. Thereby, it is possible to realize a laminated structure that does not require brazing while maintaining gas sealing performance. That is, according to the present invention, it is possible to simultaneously ensure the connectivity and gas sealing performance of the stacking auxiliary device using the metal frame.

  Here, as the preheating of the oxidant gas or the fuel gas, preheating by heat exchange with exhaust gas and / or preheating from a fuel cell main body (a configuration of a fuel cell stack or the like that performs power generation other than a stacking auxiliary device). Can be mentioned.

(2) In the present invention, as described in claim 2, the gas seal portion may be made of mica or vermiculite.
Mica or vermiculite has high gas sealability, heat resistance durability, processability, and the like, and is suitable as a material for the gas seal portion. In addition to this, materials mainly composed of ceramics (including glass) are chemically stable at high temperatures and have low gas permeability, and thus can be employed as materials for gas seal portions.

  (3) In the present invention, as described in claim 3, as a fastening member, a penetrating member (for example, a bolt) inserted through the metal frame and the gas seal portion in the stacking direction, and at least one end of the penetrating member A mating member (for example, a nut) that is provided and fastens the metal frame and the gas seal portion in the stacking direction can be employed.

By this fastening member, the metal frame and the gas seal portion can be easily and reliably fixed.
(4) In the present invention, as described in claim 4, the fuel cell is formed by stacking a fuel cell stack composed of plate-shaped fuel cells and a stacking auxiliary device, and the stacking auxiliary is used as a fastening member. A member that combines the fixing in the stacking direction of the vessel and the fixing in the stacking direction of the fuel cell stack can be employed.

By this fastening member, the fuel cell stack and the stacking auxiliary device can be easily and reliably fixed together.
(5) In the present invention, as described in claim 5, as a stacking auxiliary device, a reformer having a reforming catalyst for reforming fuel gas, or a combustion catalyst for burning the remaining fuel gas after power generation A combustor having

  When manufacturing a stacking auxiliary device by brazing as in the prior art, if the catalyst is brazed in a state where the stacking auxiliary device is placed inside, the catalyst may deteriorate due to heating during brazing. In the invention, since the stacking auxiliary device is fixed by the fastening member, it is possible to prevent deterioration due to heating during brazing.

(6) In the present invention, as described in claim 6, a gas distribution channel for distributing the oxidant gas and / or fuel gas used for power generation may be provided in the gas seal portion.
Thereby, a metal frame and a gas seal part can be assembled | assembled three-dimensionally, and the complicated gas flow path can be formed easily. Further, the gas can be flowed from one end to the other end in the planar direction of the stacking auxiliary device by using the gas distribution channel of the gas seal portion. Furthermore, the gas distribution channel can be easily formed so as to enhance the gas mixing effect and to spread the gas uniformly over the catalyst. It should be noted that providing the gas distribution channel in the gas seal portion also has an advantage that the processing is easy as compared with the case of providing it in the metal frame.

1 is a plan view of a solid oxide fuel cell of Example 1. FIG. FIG. 2 is a side view of the solid oxide fuel cell viewed from the direction A in FIG. 1. It is explanatory drawing which shows the state which decomposed | disassembled the solid oxide fuel cell. It is explanatory drawing which shows the state which decomposed | disassembled the stacking auxiliary device. It is explanatory drawing which shows typically the gas flow path inside a solid oxide fuel cell. It is explanatory drawing which shows the state which decomposed | disassembled the lamination auxiliary | assistance apparatus in Example 2. FIG. The solid oxide fuel cell of Example 3 is shown typically, (a) is the top view, (b) is the longitudinal cross-sectional view. 6 is an explanatory diagram schematically showing a solid oxide fuel cell of Example 4. FIG.

  Embodiments of a solid oxide fuel cell to which the present invention is applied will be described below with reference to the drawings.

a) First, the schematic configuration of the solid oxide fuel cell of this example will be described.
As shown in FIGS. 1 and 2, the solid oxide fuel cell 1 is a device that generates power by receiving supply of a fuel gas (for example, hydrogen) and an oxidant gas (for example, air).

  As shown in FIG. 2, the solid oxide fuel cell 1 includes a fuel cell stack 5 in which a plurality of flat plate fuel cells 3 as power generation units are stacked, and one of the fuel cell stacks 5 in the stacking direction. Two stacking auxiliary devices 7 and 9 are provided on the side (the lower side in the figure). The fuel cell stack 5 and both stacking auxiliary devices 7 and 9 include a plurality of fastening members (first to eighth fastening members) 11 that penetrate the fuel cell stack 5 and both stacking auxiliary devices 7 and 9 in the stacking direction. 18 is fixed integrally. The fastening members 11 to 18 are composed of bolts (penetrating members) and nuts as will be described later. Each configuration will be described below.

  As shown in an exploded view in FIG. 3, the fuel cell 3 is a so-called fuel electrode support membrane type fuel cell, and a fuel electrode (anode) 39 is disposed on the fuel gas flow path 37 side. In addition, a thin-film solid electrolyte body (solid oxide body) 41 is formed on the upper surface of the fuel electrode 39 in FIG. An air electrode (cathode) 43 is formed on the surface of the solid oxide body 41 on the air flow path 45 side. The fuel cell stack 5 has a plurality of fuel cells 3 electrically connected in series.

  As the solid oxide body 41, materials such as YSZ, ScSZ, SDC, GDC, and perovskite oxide can be used. Further, as the fuel electrode 37, Ni and a cermet of Ni and ceramic can be used, and as the air electrode 43, a perovskite oxide, various noble metals and cermets of noble metal and ceramic can be used.

  A current collector 49 is disposed between the air electrode 43 and the metal interconnector 47 in the upper part of FIG. Here, the fuel electrode 39, the solid oxide body 41, and the air electrode 43 are referred to as a cell body 51.

  Specifically, the fuel cell 3 includes a metal square frame-like air electrode frame 53 on the air flow path 45 side and a ceramic square frame-like shape between a pair of upper and lower metal interconnectors 47, 47. An insulating frame 55, a metal rectangular frame-shaped separator 57 that is disposed by joining the cell main body 51 and blocks the gas flow path, and a metal square frame-shaped fuel electrode frame 59 on the fuel gas flow path 37 side. And. Note that brazing or a gas seal material can be appropriately employed between the interconnector 47 and each member (the insulating frame 55, the fuel electrode frame 59, etc.) in order to ensure gas sealing performance.

  That is, the interconnector (outer peripheral edge portion) 47, the air electrode frame 53, the insulating frame 55, the separator (outer peripheral edge portion) 57, and the fuel electrode frame 59 constitute the frame portion 61 of the fuel cell 3. The frame portion 61 is formed with an insertion hole 63 through which the fastening members 11 to 18 are inserted.

  As schematically shown in FIG. 4, the stacking auxiliary devices 7 and 9 are flat layers for assisting power generation of the fuel cell stack 5, and preheating the oxidant gas or fuel gas, residual fuel after power generation At least one of the functions of combustion of gas (that is, remaining fuel gas other than fuel gas used for power generation), vaporization of liquid raw material for generating fuel gas, and reforming of fuel gas is performed. It is what you have.

  In the present embodiment, as the stacking auxiliary devices 7 and 9, on one side of the fuel cell stack 5 (downward in FIG. 4), a combustor 7 for burning the remaining fuel gas after power generation is provided on the upper side. An example in which a reformer 9 for reforming fuel gas is provided on the lower side will be described.

  The combustor 7 and the reformer 9 are composed of five square plate-like metal frames (metal plates) 71 to 75 and four square (for example, mica) as shown in an exploded view in FIG. ) It is configured integrally by laminating plate-like gas seal portions (mica plates) 76 to 79 alternately. Examples of the material of the metal frames 71 to 75 include stainless steel, and preferably stainless steel whose thermal expansion coefficient is consistent with ceramics. More specifically, SUS430, SUS444, and the like, which are ferritic stainless steels that are suitably used as the constituent members of the fuel cell stack 5, can be mentioned.

  Specifically, the combustor 7 and the reformer 9 are provided with a first metal frame 71, a first gas seal portion 76, a second metal frame 72, a second gas seal portion 77, and a third metal (from the upper left side in FIG. 5). The frame 73, the third gas seal portion 78, the fourth metal frame 74, the fourth gas seal portion 79, and the fifth metal frame 75 are laminated in this order.

  Among these, the combustor 7 includes a first metal frame 71, a first gas seal portion 76, a second metal frame 72, a second gas seal portion 77, and a third metal frame 73. The third metal frame 73 (shared with the combustor 7), the third gas seal portion 78, the fourth metal frame 74, the fourth gas seal portion 79, and the fifth metal frame 75 are configured.

  In addition, as shown in the same figure, the opening 81 which forms the through-hole 63 in which each fastening member 11-18 is penetrated is shown in the peripheral part of each metal frame 71-75 and each gas-seal part 76-79, respectively. There are 8 openings.

  In the combustor 7, square openings 83 to 85 are provided at the centers of the first gas seal portion 76, the second metal frame 72, and the third gas seal portion 77, respectively. The openings 83 to 85 overlap (at the time of lamination) to form a hollow inner chamber 87. In addition, the first gas seal portion 76 and the third gas seal portion 77 are formed with a plurality of notches 89 serving as gas flow paths as shown in the figure in order to communicate the peripheral edge opening 81 with the internal chamber 87. Has been.

  In this internal chamber 87, in order to mix and burn residual air similar to the residual fuel gas after power generation (that is, remaining air other than the air used for power generation), a combustion catalyst (for example, a Pt catalyst, For example, 100 cc of Pd catalyst) 91 is filled. Thereby, the unburned gas contained in the passing gas of the fuel cell 3 is burned and rendered harmless.

  On the other hand, in the reformer 9, square openings 93 to 95 are provided at the centers of the third gas seal portion 78, the fourth metal frame 74, and the fourth gas seal portion 79, respectively ( The openings 93 to 95 overlap (when the frames are stacked) to form a hollow inner chamber 97. In addition, the third gas seal portion 78 and the fourth gas seal portion 77 are also formed with a plurality of cutouts that become gas flow paths 99 as shown in the figure in order to communicate the peripheral edge opening 81 with the internal chamber 97. Has been.

  The internal chamber 97 is filled with, for example, 100 cc of a reforming catalyst (for example, Ni catalyst, Ru catalyst, Rh catalyst, Pt catalyst) 101. Accordingly, it has a function of reforming hydrocarbon gas (mainly city gas and natural gas) supplied from the outside, that is, a function of reforming to a hydrogen-rich fuel gas.

  In the present embodiment, as described above, the fuel cell stack 5 and the stacking auxiliary devices 7 and 9 are integrally fixed by the first to eighth fastening members 11 to 18, and the first to first As shown in FIG. 4, the eight fastening members 11 to 18 include first to eighth bolts 111 to 118 that pass through the fuel cell stack 5, the combustor 7, and the reformer 9, respectively, and first to first bolts thereof. It is comprised from the 1st-8th nut 121-128 screwed together at the front-end | tip (the upper side of the figure) of 8 bolts 111-118.

  Among the first to eighth nuts 121 to 128, the third nut 123 is provided with a combustion gas discharge pipe 131 for discharging combustion gas (exhaust gas) from the insertion hole 63 in the fuel cell stack 5 to the outside. The fourth nut 124 is provided with an air introduction tube 133 for introducing air into the other insertion hole 63 in the fuel cell stack 5, and the fifth nut 125 is provided with fuel gas in the fuel cell stack 5. Furthermore, a fuel gas introduction pipe 135 for introduction into another insertion hole 63 is provided. The other nuts 121, 122, 126 to 128 are cap nuts.

  Further, between the first to eighth bolts 111 to 118 and the reformer 9, and between the first to eighth nuts 121 to 128 and the fuel cell 5, between each insertion hole 63 and the outside. In order to perform electrical insulation and gas sealing, sealing members 137 and 139 (made of mica, for example) are arranged.

b) Next, fixing of the solid oxide fuel cell 1 and formation of the gas flow path by the above-described fastening members 11 to 18 will be described.
As shown in FIG. 4, the first to eighth bolts 111 to 118 and the first to eighth nuts 121 to 128 are integrally bundled so that the fuel cell stack 5, the combustor 7 and the reformer 9 can be separated. And a fastening member for fixing.

  Specifically, the first to eighth bolts 111 to 118 and the first to eighth nuts 121 to 128 integrally form a fuel cell stack 5 composed of a plurality of fuel cells 3, and a plurality of metal frames 71 to 73 and a combustor 7 composed of a plurality of gas seal portions 76 and 77 are integrally formed, and similarly, a reformer 9 composed of a plurality of metal frames 73 to 75 and a plurality of gas seal portions 78 and 79 is integrated. Composed.

  Therefore, when the solid oxide fuel cell 1 is clamped in the stacking direction by the first to eighth bolts 111 to 118 and the first to eighth nuts 121 to 128, the fuel cell stack 5, the combustor 7, and the reformer. 9 can be fixed integrally. On the contrary, when the fixing by the first to eighth bolts 111 to 118 and the first to eighth nuts 121 to 128 is loosened, the combustor 7, the reformer 9, and the fuel cell stack 5 can be separated.

  In addition, as a fastening member comprised from the 1st-8th bolts 111-118 and the 1st-8th nuts 121-128, it is good also as a structure which attaches a nut to the both ends of the bolt which has a head at one end.

  Of the first to eighth bolts 111 to 118, the first and seventh bolts 111 and 117 are bolts used only for fixing the fuel cell stack 5, the combustor 7 and the reformer 9. It is.

  On the other hand, the other second to sixth bolts 112 to 116 and the eighth bolt 118 fix the fuel cell stack 5, the combustor 7 and the reformer 9, and use the surrounding insertion holes 63. And used as a flow path for circulating gas.

  That is, as will be described in detail later, the insertion hole 63 through which the second, fifth, and sixth bolts 112, 115, and 116 are inserted is used as a fuel gas flow path, and the fourth and eighth bolts 114 and 118 are inserted. The insertion hole 63 through which the third bolt 113 is inserted is used as an air passage, and the insertion hole 63 through which the third bolt 113 is inserted is used as a combustion gas passage.

c) Next, the gas flow path in the present embodiment will be described.
<Air flow path>
As shown in FIG. 4, the air is introduced from the air introduction pipe 133 into the insertion hole 63 around the fourth bolt 114, and then the air of each fuel cell 3 of the fuel cell stack 5 from the insertion hole 63. It is introduced into the flow path 45 and used for power generation.

Then, the remaining air after power generation is discharged from each fuel cell 3 to the insertion hole 63 around the eighth bolt 118 and then introduced into the combustor 7 through the insertion hole 63.
<Flow path of fuel gas>
The fuel gas is introduced from the fuel gas introduction pipe 135 into the insertion hole 63 around the fifth bolt 115, and then introduced into the reformer 9 through the insertion hole 63, and the fuel gas is reformed.

  The reformed fuel gas is introduced from the reformer 9 into the insertion hole 63 around the second bolt 112, and then the fuel gas flow path 37 of each fuel cell 3 of the fuel cell stack 5 from the insertion hole 63. And used for power generation.

The remaining fuel gas after power generation is discharged from each fuel cell 3 to the insertion hole 63 around the sixth bolt 116 and then introduced into the combustor 7 through the insertion hole 63.
<Flow of combustion gas>
The remaining fuel gas and the remaining air after power generation introduced into the combustor 7 are combusted in the combustor 7, and the combustion gas (exhaust gas) is discharged to the insertion hole 63 around the third bolt 113. Then, the gas is discharged from the insertion hole 63 to the outside through the combustion gas discharge pipe 131.

d) The effect of this embodiment will be described.
In the present embodiment, in order to configure the combustor 7 and the reformer 9, the first to fourth gas seal portions 76 to 79 are disposed between the first to fifth metal frames 71 to 75, They are fixed together by pressing them together with the fuel cell stack 5 in the stacking direction using the first to eighth fastening members 111 to 118.

  Accordingly, when the first to fourth gas seal portions 76 to 79 are tightened, the first to fourth gas seal portions 76 to 79 are preferentially deformed on the contact surface (from the metal frames 71 to 75), and the adhesion to the metal frames 71 to 75 is improved. improves. Thereby, it is possible to realize a laminated structure that does not require brazing while maintaining gas sealing performance. That is, according to the present embodiment, it is possible to simultaneously ensure the connectivity and gas sealing performance of the stacking auxiliary devices 7 and 9 using the plurality of metal frames 76 to 79.

Next, the second embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
In the present embodiment, since the configurations of the metal frame and the gas seal portion constituting the combustor and the reformer are different from those of the first embodiment, different points will be described in detail.

  As shown in an exploded view in FIG. 6, in the solid oxide fuel cell of the present embodiment, the combustor 201 and the reformer 203 include five metal frames 205 to 209 and four gas seal portions 211. Are integrally formed by alternately stacking ˜214.

  Specifically, the combustor 201 includes a first metal frame 205, a first gas seal portion 211, a second metal frame 206, a second gas seal portion 212, and a third metal frame 207, and the reformer 203 includes A three metal frame 207 (shared with the combustor 201), a third gas seal portion 213, a fourth metal frame 208, a fourth gas seal portion 214, and a fifth metal frame 209 are configured.

  In particular, in the present embodiment, a gas distribution flow path is provided in the first gas seal portion 211, the second metal frame 206, and the second gas seal portion 212, which constitute the internal chamber 215 of the combustor 201, as shown in the figure. It has been.

That is, along each side of the second metal frame 206, slits 219 extending from the respective insertion holes 217 to both sides in the plane direction are provided, and corners of the first gas seal portion 211 and the second gas seal portion 212 (the same figure). A pair of cutouts 221 and 223 are provided on the lower left side, respectively.
Among these, the pair of cutouts 221 of the first gas seal portion 211 is arranged perpendicular to each adjacent side, and is on the side of the triangular small opening 222 (specifically, a small region divided by an oblique barrier 224). It is comprised so that it may open to. Note that the second gas seal portion 212 has the same configuration and is provided with a similar small opening 226.
With this configuration, the adjacent slits 219 of the second metal frame 206 have a pair of notches 221 and a small opening 222 of the first gas seal portion 211 and an opening that constitutes the internal chamber 215 of the second metal frame 206. 220 and a space formed by the pair of notches 223 and the small opening 226 of the second gas seal portion 212.

  Further, the third gas seal part 213, the fourth metal frame 208, and the fourth gas seal part 214 constituting the internal chamber 225 of the reformer 203 are also provided with gas distribution channels as shown in the figure. .

  That is, the fourth metal frame 208 is provided with slits 229 extending from the respective insertion holes 217 to both sides in the planar direction. The third gas seal portion 213 and the fourth gas seal portion 214 have the slit 229 and the inner chamber 225. Notches 231 and 233 that communicate with each other three-dimensionally are provided. The third gas seal part 213 and the fourth gas seal part 214 are also formed with other slits 235 and 237 that three-dimensionally connect the other insertion holes 217 and the internal chamber 225.

  Here, the four notches 231 of the third gas seal portion 213 are configured to extend perpendicularly to the side (upper side of the figure) and open to the opening 224 side, and the slit 235 includes the opening 224 and Is separated from the opening 224 by a barrier 226 parallel to the side (lower side of the figure) (the fourth gas seal 214 has the same configuration).

  In the present embodiment, as described above, the first to fourth gas seal portions 211 to 214 and the second and fourth metal frames 206 and 208 have slits 219, 229, 235, and 237 serving as gas distribution channels. Since the notches 221, 223, 231 and 233 are provided, the first to fourth gas seal portions 211 to 214 and the second and fourth metal frames 206 and 208 are three-dimensionally assembled to form a complicated gas. The flow path can be easily formed.

  Moreover, gas can be flowed from one end to the other end in the planar direction of the combustor 201 or the reformer 203 using the gas distribution flow paths of the first to fourth gas seal portions 211 to 214. Furthermore, the gas mixing effect can be enhanced, and the gas can be uniformly distributed to the catalyst.

Next, the third embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
This embodiment differs from the first embodiment in the method for fixing the solid oxide fuel cell.
As shown in FIG. 7, the solid oxide fuel cell 301 of the present embodiment includes stacking auxiliary portions 305 and 307 on both sides in the stacking direction of the fuel cell stack 303 (vertical direction in FIG. 7B). ing.

  Each of the stacking auxiliary units 305 and 307 is composed of three stacking auxiliary units. These stacking auxiliary units include an oxidant gas or fuel gas preheater, and combustion of residual fuel gas after power generation. A liquid raw material vaporizer for generating a fuel gas, a fuel gas reformer, and the like can be employed.

  A fixture 309 having a U-shaped cross section is fitted into each side of the solid oxide fuel cell 301 (in a direction perpendicular to the stacking direction), and an upper portion 313 of the fixture 309 is fitted into the fixture 309. A plurality of bolts 311 are arranged.

  That is, when the bolt 311 is tightened in a state where the upper and lower sides of the solid oxide fuel cell 301 are sandwiched between the upper portion 313 and the lower portion 315 of the fixing portion 309, the tip of the bolt 311 causes the solid oxide fuel cell 301 to move in the stacking direction. By pressing, the solid oxide fuel cell 301 can be fixed integrally.

  That is, in the present embodiment, the fixing tool 309 and the bolt 311 function as a vise and the solid oxide fuel cell 301 is fixed integrally. Thus, the same effect as in the first embodiment can be obtained.

Next, the fourth embodiment will be described, but the description of the same contents as the third embodiment will be omitted.
This example differs from Example 3 in the method of fixing the solid oxide fuel cell.
As shown in FIG. 8, the solid oxide fuel cell 401 according to the present embodiment includes stacking auxiliary portions 405 and 407 on both sides in the stacking direction of the fuel cell stack 403 (the vertical direction in the figure).

In addition, each lamination auxiliary | assistant part 405 and 407 is comprised from the three lamination auxiliary | assistant devices similarly to the said Example 3, respectively.
This solid oxide fuel cell 401 is accommodated in a container 413 with the upper and lower sides sandwiched between plates 409 and 411.

In particular, in this embodiment, the solid oxide fuel cell 401 is configured to be loaded (pressed) in the stacking direction via a pressing member 415 mounted on the upper plate 409.
In this press method, a load can be applied by hydraulic pressure, air pressure, or a spring.

Also in this embodiment, the same effects as those of the third embodiment are obtained.
As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various aspect can be taken.

  (1) For example, as the stacking auxiliary device of each of the above embodiments, an oxidant gas or fuel gas preheater, a residual fuel gas combustor after power generation, a liquid raw material vaporizer for generating fuel gas, and A fuel gas reformer or the like can be employed.

  (2) In addition to the solid oxide fuel cell, the present invention can be applied to, for example, a molten carbonate fuel cell, a phosphoric acid fuel cell, and the like.

DESCRIPTION OF SYMBOLS 1,301,401 ... Solid oxide fuel cell 3 ... Fuel cell 5, 303, 403 ... Fuel cell stack 7 ... Combustor 9, 203 ... Reformer 11, 12, 13, 14, 15, 16, 17 , 18 ... Fastening members 63, 217 ... Insertion holes 71, 72, 73, 74, 75, 205, 206, 207, 208, 209 ... Metal frames 76, 77, 78, 79, 211, 212, 213, 214 ... Gas Seal part 89, 221, 223, 231, 233 ... Notch 91 ... Combustion catalyst 101 ... Reforming catalyst 111, 112, 123, 124, 125, 126, 127, 128, 311 ... Bolt 121, 122, 123, 124, 125, 126, 127, 128 ... nuts 219, 229, 235, 237 ... slits

Claims (6)

In the power generation reaction of the fuel cell, at least one of the functions of preheating the oxidant gas or fuel gas, burning the remaining fuel gas after power generation, vaporizing the liquid raw material to generate the fuel gas, and reforming the fuel gas A fuel cell having a stacking auxiliary device having a single function and stacking a plurality of plate-shaped metal frames,
The stacking auxiliary device is interposed between two adjacent metal frames, and is laminated together with the metal frame and has a plate-like gas seal portion having a lower strength than the metal frame,
Fastening members that fasten and fix the metal frame and the gas seal portion in the stacking direction;
A fuel cell comprising:   The fuel cell according to claim 1, wherein the gas seal portion is made of mica or vermiculite. The fastening member is
A penetrating member inserted through the metal frame and the gas seal portion in the stacking direction;
A mating member provided at at least one end of the penetrating member and tightening the metal frame and the gas seal portion in the stacking direction;
The fuel cell according to claim 1, comprising: The fuel cell is a stack of a fuel cell stack composed of plate-shaped fuel cells and the stacking auxiliary device,
The fuel according to any one of claims 1 to 3, wherein the fastening member is a member that serves as both fixing in the stacking direction of the stacking auxiliary device and fixing in the stacking direction of the fuel cell stack. battery.   The stacking auxiliary device is a reformer having a reforming catalyst for reforming the fuel gas, or a combustor having a combustion catalyst for burning the remaining fuel gas after power generation. The fuel cell of any one of -4.   The fuel cell according to any one of claims 1 to 5, wherein a gas distribution flow path for distributing an oxidant gas and / or a fuel gas used for the power generation is provided in the gas seal portion.