JP2020004726A - Solid oxide fuel cell module - Google Patents

Abstract

To provide a solid oxide fuel cell module that achieves weight reduction and improved assemblability while maintaining the conventional insulation performance.SOLUTION: In a solid oxide fuel cell module including a module container 1016 and a plurality of fuel cells that generate power using an oxidizing gas and a fuel gas inside the module container 1016, the module container 1016 is covered with a plurality of plate-shaped heat insulating materials 1000 covered with a shape holding sheet 1000b that holds a shape in a plate shape. The plate-shaped heat insulating material 1000 constitutes the outermost surface of the solid oxide fuel cell module, and a portion where the plurality of plate-shaped heat insulating materials 1000 are in contact with each other is fixed to the module container 1016 by a fixing member 1004.SELECTED DRAWING: Figure 5

Description

The present invention relates to a heat insulating material surrounding a fuel cell module having a fuel cell therein, and more particularly to a solid oxide fuel cell module.

As a next-generation clean power generation device, the development of a fuel cell device including a fuel cell having high power generation efficiency and accessories for operating the fuel cell has been activated. As a fuel cell,
Polymer electrolyte fuel cell (PEFC), phosphoric acid fuel cell (PAFC), molten carbonate fuel cell (MCFC), solid oxide fuel cell (SOFC), alkaline electrolyte fuel cell (A
FC), direct fuel cell (DFC) and the like are known.

In particular, SOFCs operate at high temperatures by using an oxide ion conductive solid electrolyte as the electrolyte, providing electrodes on both sides, and supplying fuel gas to one side and oxygen-containing gas such as air or oxygen to the other side. Fuel cell. Generally, fuel gas supplied to a solid oxide fuel cell is generated by reforming city gas or natural gas. It is necessary to heat a fuel reformer that converts city gas and the like to fuel gas at a high temperature, but the operating temperature of the SOFC is about 700 to 1000 ° C., which is an operation at a higher temperature than other fuel cells. Therefore, the fuel reformer can be heated using the exhaust gas. That is, the SOFC has an advantage that high power generation efficiency can be obtained without the need to separately provide heat for heating the fuel reformer from the outside.

By the way, in this solid oxide fuel cell device, a fuel cell module in which a fuel cell is housed and a power generation reaction is internally performed, a control unit and an inverter for controlling a fluid such as fuel gas, air, and water are provided. Since an auxiliary device such as a heat recovery unit (hereinafter also referred to as an auxiliary device unit) is required, a form in which the fuel cell module and the auxiliary device are housed in the same housing to form a power generation unit is generally used.

Therefore, in a fuel cell module containing a solid oxide fuel cell therein, if heat is released to the outside of a fuel cell module container (hereinafter sometimes referred to as a module container), the same casing Since the auxiliary equipment housed in the storage device has low heat resistance performance, there is a possibility that the auxiliary equipment may be damaged by the released heat. Further, since the fuel cell operates at a high temperature, if heat is released to the outside of the module container, the temperature inside the module container will decrease, and the energy efficiency will decrease. For these reasons, the outer surface of the fuel cell module container is covered with heat insulating material in order to prevent the failure of accessories and the decrease in energy efficiency caused by releasing heat to the outside of the module container. It is required to cover and prevent heat from being dissipated from the operating fuel cell module.

For example, in Patent Document 1, the outer surface of a fuel cell module in which a plurality of fuel cells are housed is covered with a block-shaped heat insulating material, and the outer surface of the heat insulating material is surrounded by a metal casing. It is disclosed.

JP 2014-191972A

Here, the heat insulating material used for the fuel cell module has low strength, and there is a concern that cracks and chips may occur. It is desirable from the viewpoint of heat insulation performance that the heat insulating material is disposed in close contact with the fuel cell module container, but if cracks or chips occur, the heat insulation performance of the fuel cell module is reduced. That is, since the heat of the fuel cell module container escapes from the gap generated by the breakage of the heat insulating material, unnecessary heat radiation occurs, leading to a decrease in the heat utilization rate.

Furthermore, minute dust of the heat insulating material caused by cracking or chipping of the heat insulating material may adversely affect the auxiliary devices arranged side by side inside the apparatus. Specifically, minute dust invades auxiliary equipment and short-circuits the inverter's electric circuit and prevents heat from electronic components.
Auxiliary equipment is adversely affected by causing equipment failure.

For the above reasons, it is necessary to protect the periphery of the heat insulating material with a strong member to prevent cracking or chipping of the heat insulating material. However, since the fuel cell module operates at high temperature, the fuel cell It is desirable that the members constituting the outer surface have heat resistance. In the configuration of Patent Literature 1, the outermost surface of the fuel cell module is covered with a heat-resistant metal housing, and protects and reinforces a heat insulating material disposed outside the module container.

However, covering the outer surface of the heat insulating material with a heat-resistant metal member or the like after disposing the heat insulating material as described above is very poor in workability. Becomes large.

More specifically, a heat insulating material is disposed on each side surface and upper and lower surfaces of the fuel cell module container, and these operations must be performed with care in handling so that the heat insulating material is not damaged. Further, the outer surface of the heat insulating material is covered with a metal member or the like. However, from the viewpoint of compactness, the heat insulating material and the metal member are configured so that almost no gap is generated. There is a possibility that the heat insulating material may be broken due to contact with the member and cracks or chips may occur. Therefore, it was necessary to pay close attention to the handling of the heat insulating material when assembling the fuel cell module. In addition, since a metal member is used to cover the outer surface of the fuel cell module, there is a problem that the member cost is increased and the weight of the fuel cell module is increased.

In view of the above, it is an object of the present invention to solve the above-mentioned problems and to provide a solid oxide fuel cell module that achieves improved assemblability and reduced weight while maintaining the conventional heat insulating performance.

  Therefore, one embodiment of the structure of the invention disclosed in this specification is that a module container and a module container are covered with a plurality of plate-like heat insulating materials covered with a shape holding sheet that holds a shape in a plate shape, and a plurality of plate containers. The portions where the plate-shaped heat insulating materials are in contact with each other are fixed to the module container by a fixing member. It is a linear shape that extends.

According to the present invention configured as described above, by covering the heat insulating material with the shape holding sheet and imparting strength to the heat insulating material, the heat insulating material can be held in a plate shape, and the module container can be formed in the most suitable shape. Can be located on the outer surface. In other words, the use of a plate-shaped heat insulating material eliminates the need for a metal housing that was necessary to suppress the generation of dust and a decrease in heat insulating performance. Becomes possible. For this reason, if only the contact portion of each plate-shaped heat insulating material is fixed, it can be fixed to the module container, so that the fuel cell module can be configured with a minimum of fixing members. Furthermore, since the heat insulating material is improved in strength by being configured as a plate heat insulating material, the sheet heat insulating material can be attached to the outside of the module container without paying close attention to the handling of the heat insulating material when assembling the fuel cell module. The fuel cell module can be arranged so that the fuel cell module can be assembled easily. As described above, by configuring the conventional heat insulating material as a plate-shaped heat insulating material, it is possible to improve the workability of assembling the module container, and realize the weight reduction and the reduction of the material cost of the fuel cell module.

In one embodiment of the structure of the invention disclosed in this specification, the fixing member is provided so as to cover a portion where each of the plate-shaped heat insulating materials is in contact, and the vicinity thereof, and the fixing member is provided with each of the plate-shaped heat insulating materials. It is fixed by crushing the contacting part.

According to the present invention configured as described above, the contact portions of the heat insulating materials are brought into close contact with each other so as to be crushed by the fixing member, and the heat insulating performance of the contact portions can be improved. In the present invention, heat insulation coating of the module container is performed by arranging plate-shaped heat insulating materials side by side. However, when the heat insulating materials are juxtaposed in this manner, heat is easily radiated from the inside of the heat insulating coating through the gap between the heat insulating materials, so that the heat insulating performance is lower than that of the heat insulating material formed integrally. Therefore, in the present invention, the heat release is suppressed by crushing the contact portions of the plate-shaped heat insulating materials arranged side by side. This is because, in the conventional block-shaped heat insulating material, the contact portion collapses due to its brittleness in strength, but since the plate-like heat insulating material is covered and the plate-like shape is maintained, it can be crushed without collapse at the contact portion. As a result, it is possible to eliminate a gap from which heat is released. Therefore, it is not necessary to separately enhance the heat insulating performance by a plurality of members, and it is possible to realize a reduction in weight and an improvement in assemblability.

In one embodiment of the present invention disclosed in this specification, the fixing member has an L-shaped cross section.

According to the present invention thus configured, since the contact portions of the plate-shaped heat insulating material make contact with each other at an angle, the contact portions of the plate-shaped heat insulating material are fixed by an L-shaped fixing member so as to cover the contact portions. be able to. Therefore, since the portion where the fixing member covers the plate-shaped heat insulating material can be minimized, the weight of the fuel cell module can be reduced. Note that the L-shape may have different lengths of two sides in cross-sectional view.

In one embodiment of the present invention disclosed in this specification, the fixing member has a linear shape extending along a portion where each of the plate-shaped heat insulating materials contacts.

According to the present invention configured as described above, each plate-shaped heat insulating material contacts over one side, but by fixing the fixing member to a linear shape, the plate-shaped heat insulating material is brought into close contact with one fixing member. Can be fixed. In other words, since the two plate-shaped heat insulating materials come into contact on one side, heat is likely to be generated over one side, but the two plate-shaped heat-insulating materials are contacted over one side by one fixed member formed in a linear shape. The heat insulating materials can be fixed so as to be crushed. Therefore, since one fixed member can completely cover the contact portion between the two plate-shaped members, it is adhered over one side, preventing the heat insulation performance from being partially different, and exhibiting uniform heat insulation performance. be able to.

In one embodiment of the structure of the present invention disclosed in this specification, a heat insulating material that is not covered with a shape holding sheet is disposed between a plate-shaped heat insulating material and a module container.

According to the present invention configured as described above, the fuel cell module housing can be formed by the high-strength plate-shaped heat insulating material. Therefore, a strongly brittle heat insulating material is provided between the module container and the plate-shaped heat insulating material. Even if it is arranged, the plate-like heat insulating material can be attached so as to be attached to the outer surface thereof, so that the assembling property is improved. In addition, the outer surface of the module container is in a high temperature state due to the heat inside the module container. Can be prevented from decreasing.

In one embodiment of the structure of the invention disclosed in this specification, the heat insulating material coated on the shape-retaining sheet of the plate-shaped heat insulating material is a heat insulating material containing fumed silica.

Here, a heat insulating material containing fumed silica is generally brittle, has a good heat insulating performance, but has a feature of storing moisture inside due to its high hydrophilicity. When the outer surface of the heat insulating material is covered with a metal housing from the viewpoint of reinforcing the heat insulating material, the water stored inside the heat insulating material evaporates depending on the operating environment, and the water is removed between the metal housing and the heat insulating material. Thus, there is a problem that the heat insulating material deteriorates due to repeated condensation and evaporation.

Therefore, according to the present invention thus configured, the heat insulating material containing fumed silica constitutes the outermost wall of the module container except for the portion where the fixing member is provided, so that the heat insulating material Even if the moisture stored in the fumed silica is not condensed, the heat insulating material containing fumed silica enjoys the high heat insulating performance, but the heat insulating material does not deteriorate due to the water generated by the condensation of water vapor.

In one embodiment of the structure of the invention disclosed in this specification, the shape maintaining sheet is a glass cloth.

According to the present invention thus configured, the maximum use temperature of the glass cloth is about 550.
Although the temperature is lower than the operating temperature of the fuel cell at ℃, the insulation material not covered by the shape-retaining sheet is placed between the plate-shaped heat-insulating material and the module container. Can be prevented.

It is possible to provide a solid oxide fuel cell module that achieves weight reduction and improved assemblability while maintaining the conventional heat insulating performance.

1 is a schematic configuration diagram of a solid oxide fuel cell device according to an embodiment of the present invention. FIG. 2 is a perspective view showing a fuel cell module having an outermost surface formed by a plate-shaped heat insulating material and a fixing member according to an embodiment of the present invention. It is explanatory drawing which shows arrangement | positioning of the plate-shaped heat insulation material by embodiment of this invention. It is an explanatory view showing arrangement of a fixing member by an embodiment of the present invention. FIG. 3 is a partial cross-sectional view of the fixing member and the plate-like heat insulating material according to the embodiment of the present invention, as viewed from above along line XX in FIG. FIG. 3 is a partial cross-sectional view of an arrangement portion of the ignition device according to the embodiment of the present invention as viewed from a side along a line YY in FIG. 2. 1 is a front sectional view showing a fuel cell module of a solid oxide fuel cell device according to a first embodiment of the present invention. FIG. 8 is a sectional view taken along the line III-III in FIG. 7. 1 is an exploded perspective view of a module container and an air passage cover of a solid oxide fuel cell device according to a first embodiment of the present invention. FIG. 2 is a partial sectional view showing a fuel cell unit of the solid oxide fuel cell device according to the first embodiment of the present invention. 1 is a perspective view showing a fuel cell stack of a solid oxide fuel cell device according to a first embodiment of the present invention. FIG. 2 is a side cross-sectional view showing the fuel cell module for describing a gas flow in the fuel cell module of the solid oxide fuel cell device according to the first embodiment of the present invention. FIG. 8 is a front sectional view of the fuel cell module taken along the line III-III of FIG. 7 for explaining gas flow in the fuel cell module of the solid oxide fuel cell device according to the first embodiment of the present invention. 1 is a partial cross-sectional view of an upper part of a fuel cell module of a solid oxide fuel cell device according to a first embodiment of the present invention. FIG. 2 is an explanatory diagram of exhaust gas flowing around a reformer of the solid oxide fuel cell device according to the first embodiment of the present invention. 1 is a side cross-sectional perspective view of a reformer and an exhaust gas guide member of a solid oxide fuel cell device according to a first embodiment of the present invention. 1 is a front sectional perspective view of a reformer and an exhaust gas guide member of a solid oxide fuel cell device according to a first embodiment of the present invention. FIG. 2 is an explanatory diagram of exhaust gas flowing through a through hole of a reformer of the solid oxide fuel cell device according to the first embodiment of the present invention. FIG. 2 is a front sectional view of a heat exchange unit of the solid oxide fuel cell device according to the first embodiment of the present invention. FIG. 3 is an explanatory diagram of a connection portion between a top plate and an exhaust pipe of a module container of the solid oxide fuel cell device according to the first embodiment of the present invention. FIG. 3 is an explanatory view of a power generation air supply passage on a top plate of a module container of the solid oxide fuel cell device according to the first embodiment of the present invention. FIG. 2 is an explanatory view of an exhaust passage below a top plate of a module container of the solid oxide fuel cell device according to the first embodiment of the present invention. FIG. 2 is a perspective view of a plate fin of the solid oxide fuel cell device according to the first embodiment of the present invention. FIG. 3 is an explanatory view of plate fins arranged between a side plate of an air passage cover and a side plate of a module container of the solid oxide fuel cell device according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a fuel cell module according to a first embodiment (a) and a second embodiment ((b) and (c)) of the present invention, in which a heat insulating material is omitted. Sectional view (heat insulating material) showing the fuel cell module according to the first embodiment (a) and the second embodiment ((b) and (c)) of the present invention when the fuel cell module shown in FIG. 25 is viewed from the x direction. Is omitted). Sectional view (air passage) showing the fuel cell module according to the first embodiment (a) and the second embodiment ((b) and (c)) of the present invention when the fuel cell module shown in FIG. 25 is viewed from the x direction. The description of the cover is omitted). FIG. 1 is a perspective view showing a fuel cell module according to a first embodiment (a) and a second embodiment ((b) and (c)) of the present invention. Sectional view (heat insulating material) showing the fuel cell module according to the first embodiment (a) and the second embodiment ((b) and (c)) of the present invention, as viewed from the x direction of the fuel cell module shown in FIG. Is omitted).

Next, a fuel cell module containing a solid oxide fuel cell according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall schematic diagram showing a solid oxide fuel cell device including a fuel cell module according to one embodiment of the present invention. As shown in FIG. 1, a solid oxide fuel cell device 1 according to one embodiment of the present invention includes a fuel cell module 2
And an auxiliary unit 4. The fuel cell module 2 and the auxiliary unit 4 are arranged side by side inside the solid oxide fuel cell device 1.

The fuel cell module 2 includes a module container 8, and a heat insulating material 7 and a plate-shaped heat insulating material 1000 are arranged outside the module container 8 in this order. The interior of the module container 8 is a closed space, and the power generation chamber 10 below the module container 8 is filled with a fuel gas and an oxidizing gas (hereinafter, appropriately referred to as “power generation air” or “air”). A fuel cell 12 that performs a power generation reaction is arranged. In this example, the fuel cell assembly 14 has 128 fuel cell units 16. In the fuel cell assembly 14, all of the plurality of fuel cell units 16 are connected in series.

Above the power generation chamber 10 of the module container 8 of the fuel cell module 2, a combustion chamber 18 as a combustion part is formed. In the combustion chamber 18, the remaining fuel gas not used for the power generation reaction and the remaining air Are burned to generate exhaust gas (in other words, combustion gas). Above the combustion chamber 18, a reformer 120 for generating a fuel gas is disposed, and the reformer 120 is heated by the combustion heat of the residual gas to a temperature at which a reforming reaction is possible. ing.

Furthermore, as shown in FIG. 1, the module container 8 is covered with a heat insulating material 7 to suppress the heat inside the fuel cell module 2 from radiating to the outside. Outside the heat insulating material 7, a plate heat insulating material 1000 is arranged, and the outer surface of the fuel cell module 2 is constituted by the plate heat insulating material 1000 and a fixing member (not shown). Is the fixing member 1004 (
2 and 3) to form a fuel cell module 2.

An evaporator 140 is provided in the heat insulating material 7 above the module container 8. The evaporator 140 performs heat exchange between the supplied water and the exhaust gas to evaporate the water to generate steam, and a mixed gas of the steam and the raw fuel gas (hereinafter, “fuel gas”). Is supplied to the reformer 120 in the module container 8.

FIG. 2 is an overall perspective view of the fuel cell module 1002 according to the embodiment of the present invention. 3 and 4 show simplified exploded views of the fuel cell module 2 including the plate-shaped heat insulating material 1000 and the fixing member 1004. FIG. 5 is a partial cross-sectional view from the top along the XX section in FIG. As shown in FIGS. 2, 4 and 5, the outer surfaces of the fuel cell modules 2 and 1002 are constituted by a plate-like heat insulating material 1000 and a fixing member 1004, and a region A is provided with two plate-like heat insulating materials 1000. Are in contact with each other, and a region B indicates a corner of a place where the three plate-shaped heat insulating materials 1000 contact.

Here, the configuration of the fuel cell module 1002 will be described with reference to FIGS. As shown in FIG. 3, a block-shaped heat insulating material 1001 containing fumed silica is arranged on the entire upper surface, the lower surface, the left and right, and the front surface, and a module container 1016 is accommodated therein. Further, on the outer surface of the heat insulating material 1001, a plate-shaped heat insulating material 1000 is provided so as to cover the entire surface except the lower surface. On the front side of the heat insulating material 1001 disposed on the lower surface, a tray 1010 made of a metal plate and having an end bent upward is disposed. As shown in FIG. It is formed so as to be bent and rise to cover the entire bottom surface. In this embodiment, the plate-like heat insulating material 10 is provided on the lower surface.
00 is not installed, but is not limited to this.

Next, as shown in FIG. 4, the plate-shaped heat insulating materials 1000 are fixed to each other by eight fixing members 1004. Each fixing member 1004 has two plate-shaped heat insulating materials 1
000 are provided so as to cover a region A where the 000 contacts and a region B where the three plate-shaped heat insulating materials 1000 are in contact, and fix the plurality of plate-shaped heat insulating materials 1000. Further, FIG.
Referring to FIG. 2, a fuel supply pipe 1003, a power generation air introduction pipe 1005, a temperature sensor 1006, and an ignition device 1020 penetrate the plate-shaped heat insulating material 1000 and the heat insulating material 1001 on one side of the fuel cell module 1002, and the fuel is supplied from the side. It is inserted into the battery module 1002, and a hydrogen extraction pipe 1009 for hydrodesulfurizer projects from the upper surface above the module container 1002.

By the way, in general, the heat insulating material is brittle, and cracks and chips are easily generated at the time of assembling the fuel cell module 1002 and the like. The minute dust that has entered the auxiliary unit 4 (see FIG. 1) causes short-circuiting of the electronic components constituting the inside and interference with heat radiation of the electronic components. For this reason, conventionally, the heat insulating material 1
000 was disposed on the surface of the module container 1016, and then the outer surface of the heat insulating material 1000 was covered with a metal cover member to protect and reinforce the heat insulating material 1000. However, there is a concern that there is a risk of breakage of the heat insulating material 1000 due to contact between the heat insulating material 1000 and the cover member, and weight increase due to a metal cover member that covers the module container 1016.

Therefore, in the present invention, as shown in FIG. 3, a plate-shaped heat insulating material 1000 (see FIG. 5) in which the strength of the heat insulating material 1000a is improved while the periphery of the heat insulating material 1000a is protected by a shape maintaining sheet 1000b. The heat insulating material 1001 is arranged so as to be attached to all surfaces except the lower surface. Further, as shown in FIG. 4, these plate-shaped heat insulating materials 1000 are in contact with each other at their ends, and are fixed so as to cover the contact area.
To the module container 1016. That is, since the plate-shaped heat insulating material 1000 is given sufficient strength by the shape holding sheet 1000b and can maintain the plate-shaped shape, it can be installed on the outermost surface and formed as the fuel cell module 1002. It is possible to reduce the risk that dust generated due to cracking or chipping of the material adversely affects the accessory unit 4 (see FIG. 1).

Further, since the heat insulating material 1000a is protected by the shape maintaining sheet 1000b, a metal cover member for protecting the heat insulating material is not required, and is used as the outer surface of the module container 2, and the plate-shaped heat insulating material 1000 and the module container are used. A plurality of heat insulating materials 1001 whose strength is uneasy can be arranged between the heat insulating materials 1001 and 1016. In other words, it is not necessary to protect all the heat insulating material surrounding the module container 1016 with the shape maintaining sheet 1000b, and it is possible to form the heat insulating material in two layers or multiple layers and cover the outermost heat insulating material with the shape maintaining sheet 1000b. The shape holding sheet 1000b can be configured while suppressing costs. Accordingly, in order to enhance the heat insulating performance, the heat insulating material 1001 having a large thickness and a large size may not be covered with the shape maintaining sheet 1000b, and the heat insulating material 1001 may be separately disposed inside, and the surface of the heat insulating material 1001 may be provided. It can be arranged and fixed on the outer surface so as to be adhered to the device, and it is possible to improve the assemblability and reduce the weight while securing the heat insulation performance as before.

Further, a glass cloth having low thermal conductivity is used for the shape maintaining sheet 1000b. Although the maximum use temperature of the glass cloth is about 550 ° C., which is lower than the operating temperature of the fuel cell device, the heat insulating material 1001 which is not covered by the cover sheet 1000b is provided between the plate heat insulating material 1000 and the module container 1016. Since the fuel cell module 1002 is arranged at the inner side, the fuel cell module 1002 does not deteriorate or be damaged when the fuel cell module 1002 is operated at a high temperature.

By the way, when the module container 1016 is surrounded by a plurality of heat insulating materials, the contact points A of the respective heat insulating materials are apt to form a gap, so that the internal heat is easily released, and the heat insulating material is more insulated than the integrally formed heat insulating material. Performance is reduced. However, according to the embodiment of the present invention, referring to FIG. 5, in the region A where each of the plate-shaped heat insulating materials 1000 contacts, the heat insulating materials 1000a wrapped in the shape holding sheet 1000b are respectively contacted by the fixing members 1004. Pressure acts in the direction of pressing the surface (solid arrow in bold in FIG. 5). Specifically, two plate-shaped heat insulating materials 10
In a region A where 00 contacts, a force acts so that the L-shaped fixing member 1004 presses the plate-shaped heat insulating material 1000 in the direction of the module container 1016 (solid thick line arrow). Therefore, as shown by the one-dot chain line arrow in FIG. 5, the heat insulating material 1000a of the plate-shaped heat insulating material 1000 extends in the longitudinal direction so as to escape from the compression direction. Insulation 10
The end of 00 is crushed and adhered. From the above, two plate-shaped heat insulating materials 1000
In the region A indicating the contact point of the above, the force (in the longitudinal direction) by the fixing member 1004 to extend in the longitudinal direction (
The action of the dashed line arrow) causes the end of the heat insulating material 1000 to be crushed and adhered, so that heat radiation from the mating surface of the heat insulating material, which is likely to form a gap, can be suppressed.

As shown in FIG. 2, in the corner region B of the fuel cell module where the three plate-shaped heat insulating materials 1000 come into contact, a gap is particularly easily formed, and heat is easily released. However, according to the embodiment of the present invention, the three regions of the fixing members 1004 overlap the region B of the corner portion of the fuel cell module, and a large pressure is applied to the plate-shaped heat insulating material 1000. Therefore, the end of the plate-shaped heat insulating material 1000 can be reliably crushed, and the heat insulating performance does not decrease even in the corner region B where heat radiation is most likely to occur.

As described above, each plate-shaped heat insulating material 1000 is in contact with the area A over one side (see the area A in FIG. 2), but the fixing member 1004 having an L-shaped cross section is formed in a linear shape. Therefore, the two plate-shaped heat insulating materials 1000 are adhered over one side (see the thick black line in FIG. 5). Further, in the area A, one fixing member 1004 is used for two plate-like heat insulating materials 1000.
(See the bold solid line arrow in FIG. 5), the heat insulating performance can be exerted uniformly over one side with the minimum fixing member 1004 without partially different heat insulating performance. In the present embodiment, the plate-shaped heat insulating material 1000 provided on a portion other than the bottom surface of the fuel cell module 2 is fixed by the fixing member 1004, and the pressure toward the module container 1016 is equalized as a whole. Alternatively, a fixing member may be provided.

Here, the heat insulating materials 1001 and 1000a contain fumed silica. Insulation materials containing fumed silica are generally brittle and have good heat insulation performance, but have a high hydrophilicity and thus store moisture inside. It is known that the outer surface of the heat insulating material is covered with a metal casing from the viewpoint of reinforcing the heat insulating material, but the moisture stored inside evaporates depending on the operating environment, and the moisture is removed from the metal casing and the heat insulating material. In this case, there is a problem that the heat insulating material deteriorates due to repeated condensation and evaporation.
Therefore, according to the present invention, the heat insulating materials 1001 and 1000a containing fumed silica are:
Since the outermost surface of the module container 1016 is configured except for the portion where the fixing member 1004 is provided, the water stored in the heat insulating materials 1001 and 1000a evaporates and is discharged to the outside of the fuel cell module 2. Insulation material 10 made of water generated by condensation of water vapor
01, 1000a can be prevented from deteriorating.

From the above, according to the embodiment of the present invention, the plate-shaped heat insulating material 1000 and the fixing member 1004
Because of this, the outermost surface of the fuel cell module is formed, that is, the casing of the fuel cell module can be formed, so that a metal cover for protecting the heat insulating material is not required,
It is possible to reduce the cost and weight. Further, the plate-shaped heat insulating material 1000 has high strength and can be assembled to the module container 1016 so as to be attached to the heat insulating material 1001 so that the outermost surface can be configured, so that the fuel cell module 1002 can be assembled while reducing the risk of damage to the heat insulating material. It becomes. In addition, the plate-shaped heat insulating material 1000 can be fixed while suppressing heat radiation in the region A or the region B by the fixing member 1004. Therefore, it is not necessary to enhance the heat insulating performance by a plurality of members. Improvement can be realized.

Next, the igniter 1020 inserted from the side of the fuel cell module 1002 and disposed above the fuel cell 1018 will be described with reference to FIG. FIG. 6 is a sectional view taken along line YY of FIG.

As shown in FIG. 6, the power generation chamber 1 of the module container 1016 of the fuel cell module 1002
Above 019, a combustion chamber 1014 is formed. In this combustion chamber 1014, residual fuel gas not used for the power generation reaction and residual air are burned.
20 ignites and burns the remaining gas. In this embodiment, the ignition device 102
0 uses an ignition heater, but may be ignited by an ignition plug or the like.

FIG. 6 is a partial cross-sectional view of the module container 1016 in which the ignition device 1020 is installed. The igniter 1020 penetrates the plate-like heat insulating material 1000 and the heat insulating material 1001, is inserted into the module from the side wall of the module container 1016, and is arranged so that the tip of the igniter 1020 is located in the combustion chamber 1014. Here, the reformer is not shown.

Here, since the tip of the ignition device 1020 is provided so as to be located in the combustion chamber 1014, it always receives the high-temperature combustion heat of the combustion chamber 1014. On the other hand, FIGS.
Since the ignition device 1020 is inserted into the module container 1016 through the plate-shaped heat insulating material 1000 and the heat insulating material 1001 as shown in FIG. It is difficult to dissipate the heat of the electronic device, and electronic components such as the ignition device 1020 are accelerated or deteriorated. Therefore, in this embodiment, in order to prevent the ignition device 1020 from being deteriorated or damaged by the heat inside the module container 1016, the heat radiation member 1022 connecting the ignition device 1020 and the outer surface of the plate-shaped heat insulating material 1000 is provided. Provided.

The heat radiating member 1022 is formed of a metal plate having heat conductivity. One of the metal plates is in contact with the igniter 1020, and the other is connected to the outer surface of the plate-shaped heat insulating material 1000, and each is fixed. With this configuration, the amount of heat stored in the ignition device 1020 is transmitted to the heat radiating member 1022 by heat conduction, and is transmitted to the outer surface side of the plate-shaped heat insulating material 1000. Heat exchange is performed with the outside air (dotted arrows in FIG. 6). Therefore, heat can be radiated from the ignition device 1020 surrounded by the heat insulating material, and deterioration and failure of the ignition device 1020 due to heat storage can be prevented. Note that the amount of heat radiation can be adjusted by changing the size or contact area of the plate-shaped heat insulating material 1000, and the minimum heat amount can be radiated from the ignition device 1020 to maintain the thermal efficiency of the fuel cell module 10022. . In the present embodiment, the ignition device 1020 has been described.
It is also possible to apply the present invention to an electronic component that receives heat from the inside through 16.

(First embodiment)
Next, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 7 is a side sectional view showing a fuel cell module of the solid oxide fuel cell device according to the first embodiment of the present invention, and FIG. 8 is a sectional view taken along line III-III of FIG. FIG. 9 is an exploded perspective view of the module container and the air passage cover.

As shown in FIGS. 7 and 8, the fuel cell module 2 has a fuel cell assembly 12 and a reformer 120 provided inside a module container 8 covered with a heat insulating material 7, and the module container 8 And an evaporator 140 provided inside the heat insulator 7.

First, as shown in FIG. 9, the module container 8 includes a substantially rectangular top plate 8a, a bottom plate 8c, and a pair of opposed side plates 8b connecting sides extending in the longitudinal direction (the left-right direction in FIG. 7). A closed side plate that closes the cylindrical body and two opposing openings at both ends in the longitudinal direction of the cylindrical body and connects sides extending in the width direction (left and right directions in FIG. 8) of the top plate 8a and the bottom plate 8c. 8d and 8e.

The top plate 8a and the side plate 8b of the module container 8 are covered with the air passage cover 160. The air passage cover 160 has a top plate 160a and a pair of opposed side plates 160b. An opening 167 through which the exhaust pipe 171 penetrates is provided at a substantially central portion of the top plate 160a. The space between the top plate 160a and the top plate 8a and the space between the side plate 160b and the side plate 8b are separated by a predetermined distance. Accordingly, oxidation is caused between the outside of the module container 8 and the heat insulating material 7, specifically, between the top plate 8a and the side plate 8b of the module container 8 and the top plate 160a and the side plate 160b of the air passage cover 160. Air passages 161a and 161b are formed as agent gas supply passages (see FIG. 8).

At the lower part of the side plate 8b of the module container 8, an outlet 8f as a plurality of through holes is provided (see FIG. 9). The power generation air flows from the power generation air introduction pipe 74 provided at a substantially central portion of the top plate 160 a of the air passage cover 160 on the closed side plate 8 e side of the module container 8 through the air passage direction adjustment portion 164. 161a (see FIGS. 7 and 9). Then, the air for power generation passes through the air passages 161a and 161b and is injected into the power generation chamber 10 from the outlet 8f toward the fuel cell assembly 12 (see FIGS. 8 and 9).

Further, plate fins 162 and 163, which are plate-shaped offset fins, serving as heat exchange promoting members are provided inside the air passages 161a and 161b (see FIG. 8). The plate fins 162 are connected to the top plate 8a of the module container 8 and the top plate 160a of the air passage cover 160.
The plate fin 163 is provided between the side plate 8b of the module container 8 and the side plate 160b of the air passage cover 160 in a horizontal direction so as to extend in the longitudinal direction and the width direction.
In addition, it is provided at a position above the fuel cell unit 16 so as to extend in the longitudinal direction and the vertical direction.

The air for power generation flowing through the air passages 161a and 161b is,
3 when passing through the module container 8 inside the plate fins 162 and 163 (
Specifically, heat is exchanged with the exhaust gas passing through the exhaust gas passage provided along the top plate 8a and the side plate 8b, thereby being heated. Therefore, the air passages 161a, 161a
1b, the portion where the plate fins 162, 163 are provided is a heat exchanger (heat exchange section)
Function as The portion provided with the plate fins 162 constitutes a main heat exchanger portion, and the portion provided with the plate fins 163 constitutes a subordinate heat exchanger portion.

Next, the evaporator 140 is fixed so as to extend in the horizontal direction on the top plate 8 a of the module container 8. A part 7a of the heat insulating material 7 is arranged between the evaporator 140 and the module container 8 so as to fill these gaps (see FIGS. 7 and 8).

Specifically, the evaporator 140 has a fuel supply pipe 63 for supplying water and a raw fuel gas (which may include reforming air) to one end side in the longitudinal direction (the horizontal direction in FIG. 7). And an exhaust gas discharge pipe 82 for discharging exhaust gas (see FIG. 8), and an upper end portion of the exhaust pipe 171 is connected to the other end in the longitudinal direction. The exhaust pipe 171 is connected to the top plate 160 of the air passage cover 160.
a, extends downward through an opening 167 formed in the module container 8, and is connected to an exhaust port 111 formed on a top plate 8 a of the module container 8. The exhaust port 111 is an opening for discharging exhaust gas generated in the combustion chamber 18 in the module container 8 to the outside of the module container 8. Is formed.

As shown in FIGS. 7 and 8, the evaporator 140 has a substantially rectangular evaporator case 1 as viewed from above.
41. The evaporator case 141 is formed by joining two lower case-shaped rectangular upper and lower cases 142 and 143 with an intermediate plate 144 interposed therebetween.

Therefore, the evaporator case 141 has a two-layer structure in the vertical direction. An exhaust passage portion 140A through which the exhaust gas supplied from the exhaust pipe 171 passes is formed in the lower layer portion, and the fuel passage portion 140A is formed in the upper layer portion. Evaporator 14 that evaporates water supplied from supply pipe 63 to generate water vapor
A mixing unit 140C for mixing the water vapor generated in the evaporating unit 140B with the raw fuel gas supplied from the fuel supply pipe 63 is provided.

The evaporating section 140B and the mixing section 140C are formed in a space in which the evaporator 140 is partitioned by a partition plate provided with a plurality of communication holes (slits). The evaporating section 140B is filled with alumina balls (not shown).
The exhaust passage section 140A is similarly divided into three spaces from the upstream side to the downstream side of the exhaust gas by two partition plates having a plurality of communication holes. The second space is filled with a combustion catalyst (not shown). That is, the evaporator 140 of the first embodiment includes a combustion catalyst.

In such an evaporator 140, heat exchange is performed between water in the evaporator 140B and exhaust gas passing through the exhaust passage 140A, and water in the evaporator 140B evaporates due to heat of the exhaust gas. Water vapor will be generated. Further, the mixed gas in the mixing section 140C and the exhaust passage section 14
Heat exchange is performed with the exhaust gas passing through 0A, and the temperature of the mixed gas is increased by the heat of the exhaust gas.

Further, as shown in FIG. 7, a mixed gas supply pipe 112 for supplying a mixed gas to the reformer 120 is connected to the mixing section 140C. The mixed gas supply pipe 112 is connected to the exhaust pipe 17.
1 and an opening 144 formed at one end in the intermediate plate 144.
a, and the other end is connected to a mixed gas supply port 120 a formed on the top surface of the reformer 120. The mixed gas supply pipe 112 passes through the exhaust passage 140A and the exhaust pipe 171 and extends vertically downward into the module container 8, where it is bent by approximately 90 ° and extends horizontally along the top plate 8a. , Are bent downward by approximately 90 ° and connected to the reformer 120.

Next, the reformer 120 is disposed so as to extend horizontally above the combustion chamber 18 along the longitudinal direction of the module container 8, and the exhaust gas guide member 1 is provided between the reformer 120 and the top plate 8 a of the module container 8.
It is fixed to the top plate 8a at a predetermined distance via 30. Reformer 12
Reference numeral 0 denotes an annular structure having a substantially rectangular outer shape in a top view, but having a through-hole 120b formed in the center thereof, and has a housing in which an upper case 121 and a lower case 122 are joined. The through hole 120b is positioned so as to overlap the exhaust port 111 formed in the top plate 8a when viewed from above, and preferably, the exhaust port 111 is formed at the center of the through hole 120b.

At one end of the reformer 120 in the longitudinal direction (closed side plate 8e side of the module container 8), a mixed gas supply pipe 112 is connected to a mixed gas supply port 120a provided in the upper case 121, and the other end ( On the closed side plate 8d side), the fuel gas supply pipe 64 is connected to the lower case 122, and the hydrogen removal pipe 65 for the hydrodesulfurizer extending to the desulfurizer 36 is connected to the upper case 121, respectively. Therefore, the reformer 120 receives the mixed gas (that is, the raw fuel gas (which may include reforming air) mixed with steam) from the mixed gas supply pipe 112, and reforms the mixed gas therein, The reformed gas (that is, fuel gas) is discharged from the fuel gas supply pipe 64 and the hydrogen removal pipe 65 for the hydrodesulfurizer.

The internal space of the reformer 120 is divided into three spaces by the two partition plates 123a and 123b, so that the mixed gas receiving section 120A for receiving the mixed gas from the mixed gas supply pipe 112 into the reformer 120. And a reforming section 120B filled with a reforming catalyst (not shown) for reforming the mixed gas, and a gas discharging section 12 for discharging gas passing through the reforming section 120B.
0C is formed (see FIG. 7). The reforming section 120B includes partition plates 123a, 123
b, and the reforming catalyst is held in this space. The mixed gas and the reformed fuel gas can move through a plurality of communication holes (slits) provided in the partition plates 123a and 123b. As the reforming catalyst, one obtained by adding nickel to the surface of an alumina sphere or one obtained by adding ruthenium to the surface of an alumina sphere is used as appropriate.

The mixed gas supplied from the evaporator 140 via the mixed gas supply pipe 112 is ejected to the mixed gas receiving portion 120A through the mixed gas supply port 120a. This mixed gas is expanded in the mixed gas receiving section 120A, the jet velocity is reduced, and passes through the partition plate 123a, and the reforming section 1A
20B.
In the reforming unit 120B, the mixed gas that moves at a low speed is reformed into fuel gas by the reforming catalyst,
This fuel gas passes through the partition plate 123b and is supplied to the gas discharge unit 120C.
In the gas discharge section 120C, the fuel gas is discharged to the fuel gas supply pipe 64 and the hydrogen removal pipe 65 for the hydrodesulfurizer.

The fuel gas supply pipe 64 as a fuel gas supply passage is configured to close the inside of the module container 8 with the closed side plate 8d.
Along the bottom plate 8b, bent approximately 90 ° near the bottom plate 8c, extends horizontally, enters the manifold 66 formed below the fuel cell assembly 12, and further closes the inside of the manifold 66 on the opposite side. It extends horizontally near the side plate 8e. Horizontal portion 64a of fuel gas supply pipe 64
A plurality of fuel supply holes 64b are formed on the lower surface of the fuel supply hole 64b.
Fuel gas is supplied into the manifold 66. Above the manifold 66, a lower support plate 68 having a through hole for supporting the fuel cell stack 14 is attached, and the fuel gas in the manifold 66 is supplied into the fuel cell unit 16. You. Also,
An ignition device 83 for starting the combustion of the fuel gas and the air is provided in the combustion chamber 18.

The exhaust gas guide member 130 is arranged so as to extend in the horizontal direction along the longitudinal direction of the module container 8 between the reformer 120 and the top plate 8a. The exhaust gas guide member 130 includes a lower guide plate 131 and an upper guide plate 132 which are vertically separated by a predetermined distance, and connection plates 133 and 134 to which both ends in the longitudinal direction are attached (FIG. 7). , See FIG. 8)
. Both ends in the width direction of the upper guide plate 132 are bent downward, and the lower guide plate 131 is bent.
It is connected to. The connection plates 133 and 134 have an upper end connected to the top plate 8a and a lower end connected to the reformer 120, thereby fixing the exhaust gas guide member 130 and the reformer 120 to the top plate 8a. ing.

The lower guide plate 131 is formed with a convex step 131a whose central part in the width direction (the left-right direction in FIG. 8) projects downward. On the other hand, similarly to the lower guide plate 131, the upper guide plate 132 is formed with a concave portion 132a such that the central portion in the width direction is concave downward. The convex step portion 131a and the concave portion 132a extend in the longitudinal direction in parallel in the vertical direction. The mixed gas supply pipe 112 extends horizontally in the concave portion 132a in the module container 8, then bends downward near the closed side plate 8e, penetrates through the upper guide plate 132 and the lower guide plate 131,
It is connected to the reformer 120.

The exhaust gas guide member 130 includes an upper guide plate 132, a lower guide plate 131, a connecting plate 133,1.
34 forms a gas reservoir 135 which is an internal space functioning as a heat insulating layer. This gas reservoir 135 is in fluid communication with the combustion chamber 18. That is, the upper guide plate 132, the lower guide plate 131, and the connection plates 133 and 134 are connected so as to form a predetermined gap.
It is not connected in an airtight manner. Exhaust gas can flow into the gas reservoir 135 from the combustion chamber 18 during operation, and air can flow in from outside when stopped. Is gradual.

The upper guide plate 132 is disposed at a predetermined vertical distance from the top plate 8a, and the exhaust air extending in the horizontal direction along the longitudinal direction and the width direction is provided between the upper guide plate 132 and the top plate 8a. A passage 172 is formed. The exhaust passage 172 is provided in parallel with the air passage 161a with the top plate 8a of the module container 8 interposed therebetween.
A plate fin 175 similar to the plate fins 162 and 163 in 1b is arranged. The plate fins 175 are provided at substantially the same positions as the plate fins 162 when viewed from above, and face up and down with the top plate 8a interposed therebetween. Air passage 161a and exhaust passage 17
2, the air passage 161a is provided at a portion where the plate fins 162 and 175 are provided.
Heat is efficiently exchanged between the power generation air flowing through the exhaust gas and the exhaust gas flowing through the exhaust passage 172, and the temperature of the power generation air is increased by the heat of the exhaust gas.

The reformer 120 is disposed at a predetermined horizontal distance from the side plate 8b of the module container 8, and allows the exhaust gas to pass upward from below between the reformer 120 and the side plate 8b. An exhaust passage 173 is formed. The exhaust gas guide member 130 is also disposed at a predetermined horizontal distance from the side plate 8b, and the exhaust passage 173 extends to the top plate 8a including the passage between the exhaust gas guide member 130 and the side plate 8b. ing. The exhaust passage 173 communicates with the exhaust passage 172 at an exhaust gas inlet 172a located at a corner between the top plate 8a and the side plate 8b. The exhaust gas introduction port 172a extends in the module container 8 in the longitudinal direction.

Further, the lower guide plate 131 is arranged at a predetermined vertical distance from the top surface of the upper case 121 of the reformer 120, and is disposed between the lower guide plate 131 and the upper case 121, and
The through-hole 120b of the reformer 120 forms an exhaust passage 174 that allows exhaust gas that has passed through the through-hole 120b upward from below. This exhaust passage 174 is connected to the reformer 120.
Merges with the exhaust passage 173 above.

Next, the fuel cell unit 16 will be described with reference to FIG. FIG. 10 is a partial sectional view showing a fuel cell unit of the solid oxide fuel cell device according to the first embodiment of the present invention.
As shown in FIG. 10, the fuel cell unit 16 includes a fuel cell 84 and inner electrode terminals 86 as caps connected to both ends of the fuel cell 84.
The fuel cell 84 is a tubular structure extending in the vertical direction, and has a cylindrical inner electrode layer 90, a cylindrical outer electrode layer 92, and an inner electrode layer 90 that form a fuel gas flow path 88 therein. And an electrolyte layer 94 between the electrode layer 92. The inner electrode layer 90 is a fuel electrode through which the fuel gas passes and is a (-) electrode, while the outer electrode layer 92 is an air electrode in contact with air and is a (+) electrode.

Since the inner electrode terminals 86 attached to the upper and lower ends of the fuel cell 84 have the same structure, the inner electrode terminals 86 attached to the upper end will be specifically described here. The upper portion 90a of the inner electrode layer 90 has an outer peripheral surface 90b and an upper end surface 90c exposed to the electrolyte layer 94 and the outer electrode layer 92. The inner electrode terminal 86 is made of a conductive sealing material 9.
6, the outer peripheral surface 90b of the inner electrode layer 90 is electrically connected to the inner electrode layer 90 by being in direct contact with the upper end surface 90c of the inner electrode layer 90. At the center of the inner electrode terminal 86, a fuel gas flow channel thin tube 98 communicating with the fuel gas flow channel 88 of the inner electrode layer 90 is formed.

The fuel gas flow channel thin tube 98 is an elongated thin tube provided to extend from the center of the inner electrode terminal 86 in the axial direction of the fuel cell 84. Therefore, a predetermined pressure loss occurs in the flow of the fuel gas flowing from the manifold 66 (see FIG. 7) into the fuel gas flow passage 88 through the fuel gas flow passage narrow tube 98 of the lower inner electrode terminal 86. I do. Therefore, the lower inner electrode terminal 8
The fuel gas passage thin tube 98 of No. 6 functions as an inflow-side passage resistance portion, and the passage resistance is set to a predetermined value. Also, a predetermined pressure loss occurs in the flow of the fuel gas flowing from the fuel gas passage 88 to the combustion chamber 18 (see FIG. 7) through the fuel gas passage narrow tube 98 of the upper inner electrode terminal 86. Therefore, the fuel gas flow passage narrow tube 98 of the upper inner electrode terminal 86 is
It functions as an outflow-side flow path resistance portion, and the flow path resistance is set to be a predetermined value.

The inner electrode layer 90 includes, for example, a mixture of Ni and zirconia doped with at least one selected from rare earth elements such as Ca, Y, and Sc, Ni, and a ceria doped with at least one selected from rare earth elements. It is formed from at least one of a mixture of Ni and a mixture of lanthanum garde doped with at least one selected from Sr, Mg, Co, Fe, and Cu.

The electrolyte layer 94 is made of, for example, zirconia doped with at least one selected from rare earth elements such as Y and Sc, ceria doped with at least one selected from rare earth elements, Sr,
It is formed from at least one of lanthanum gallate doped with at least one selected from Mg.

The outer electrode layer 92 includes, for example, lanthanum manganite doped with at least one selected from Sr and Ca, lanthanum ferrite doped with at least one selected from Sr, Co, Ni, and Cu, Sr, Fe, Ni, and Cu. It is formed from at least one of lanthanum cobaltite, silver, and the like doped with at least one selected from the group consisting of:

Next, the fuel cell stack 14 will be described with reference to FIG. FIG. 11 is a perspective view showing a fuel cell stack of the solid oxide fuel cell device according to the first embodiment of the present invention.
As shown in FIG. 11, the fuel cell stack 14 includes 16 fuel cell units 1.
The fuel cell units 16 are arranged in two rows of eight.
Each fuel cell unit 16 has a lower support plate 68 (see FIG.
The upper end is supported by two generally square upper support plates 100 each having four fuel cell units 16 at both ends. The lower support plate 68 and the upper support plate 100 are formed with through holes through which the inner electrode terminals 86 can pass.

Further, a current collector 102 and an external terminal 104 are attached to the fuel cell unit 16. The current collector 102 includes a fuel electrode connecting portion 102a electrically connected to the inner electrode terminal 86 attached to the inner electrode layer 90 serving as a fuel electrode, and the outer electrode layer 9 serving as an air electrode.
2 is integrally formed so as to connect the outer peripheral surface of the air electrode 2 to the air electrode connecting portion 102b which is electrically connected. Further, a silver thin film is formed on the entire outer surface of the outer electrode layer 92 (air electrode) of each fuel cell unit 16 as an electrode on the air electrode side. The current collector 102 is electrically connected to the entire air electrode when the air electrode connecting portion 102b contacts the surface of the thin film.

Further, two external terminals 104 are connected to the air electrode of the fuel cell unit 16 located at the end of the fuel cell stack 14 (the left end in FIG. 11). These external terminals 104 are connected to the inner electrode terminals 86 of the fuel cell unit 16 at the end of the adjacent fuel cell stack 14, and as described above, all of the 128 fuel cell units 16 are connected in series. It is supposed to be.

Next, gas flows in the fuel cell module of the solid oxide fuel cell device according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 12 is similar to FIG.
FIG. 13 is a side sectional view showing the fuel cell module of the solid oxide fuel cell device according to the first embodiment of the present invention, and FIG. 13 is a sectional view similar to FIG. 8 and taken along the line III-III of FIG. is there.
FIGS. 12 and 13 are diagrams in which arrows indicating gas flows are newly added in FIGS. 7 and 8, respectively, and show a state in which the heat insulating material 7 is removed for convenience of explanation. In the figure, solid arrows indicate the flow of fuel gas, broken arrows indicate the flow of air for power generation, and dashed-dotted arrows indicate the flow of exhaust gas.

As shown in FIG. 12, water and raw fuel gas (fuel gas) are supplied from a fuel supply pipe 63 connected to one end of the evaporator 140 in the longitudinal direction to an evaporator 140B provided in an upper layer of the evaporator 140.
Supplied within. The water supplied to the evaporator 140B is heated by the exhaust gas flowing through the exhaust passage 140A provided below the evaporator 140 to become steam. This water vapor and the raw fuel gas supplied from the fuel supply pipe 63 flow downstream in the evaporator 140B,
The mixing is performed in the mixing section 140C. The mixed gas in the mixing section 140C is discharged to the lower exhaust passage section 14.
Heated by exhaust gas flowing through 0A.

The mixed gas (fuel gas) formed in the mixing section 140C is supplied to the reformer 120 in the module container 8 through the mixed gas supply pipe 112. Since the mixed gas supply pipe 112 sequentially passes through the exhaust passage 140A, the exhaust pipe 171, and the exhaust passage 172, the mixed gas in the mixed gas supply pipe 112 is further heated by the exhaust gas flowing through these passages. You.

The mixed gas flows into the mixed gas receiving section 120A in the reformer 120, and then passes through the partition plate 123a and flows into the reforming section 120B. The mixed gas is reformed in the reforming section 120B to become a fuel gas. The fuel gas thus generated passes through the partition plate 123b and flows into the gas discharge unit 120C.

Further, the fuel gas branches from the gas discharge part 120C to a fuel gas supply pipe 64 and a hydrogen extraction pipe 65 for a hydrodesulfurizer. Then, the fuel gas flowing into the fuel gas supply pipe 64 is supplied into the manifold 66 from a fuel supply hole 64b provided in the horizontal portion 64a of the fuel gas supply pipe 64, and is supplied from the manifold 66 into each fuel cell unit 16. Supplied.

As shown in FIGS. 12 and 13, the power generation air is supplied from the power generation air introduction pipe 74 to the air passage 161a. When the power generation air passes through the plate fins 162 and 163 in the air passages 161a and 161b, the exhaust air passes through the exhaust passages 172 and 173 formed in the module container 8 below the plate fins 162 and 163. Efficient heat exchange is performed with the gas, and the gas is heated. In particular, since the plate fins 175 are provided in the exhaust passage 172 corresponding to the plate fins 162 of the air passage 161a, the power generation air is supplied to the exhaust gas through the plate fins 162 and the plate fins 175. Perform more efficient heat exchange. Thereafter, the air for power generation is injected into the power generation chamber 10 toward the fuel cell assembly 12 from a plurality of outlets 8f provided below the side plate 8b of the module container 8. In the first embodiment, since no exhaust passage is formed in the side portion of the fuel cell assembly 12, heat exchange between the power generation air and the exhaust gas is not performed in this portion. Therefore, in the side portion of the fuel cell assembly 12, a vertical temperature gradient is less likely to occur in the power generation air in the air passage 161b.

Further, the fuel gas not used for power generation in the power generation chamber 10 is burned in the combustion chamber 18 to become exhaust gas (combustion gas) as shown in FIG.
Specifically, the exhaust gas is branched into an exhaust passage 173 and an exhaust passage 174, and the reformer 120
, And the side plate 8b of the module container 8, and through the through hole 120b of the reformer 120, between the reformer 120 and the exhaust gas guide member 130, respectively. At this time, the exhaust gas passing through the exhaust passage 174 is bisected in the width direction by the convex step portion 131a disposed above the through hole 120b of the reformer 120, and does not stay at the lower portion of the exhaust gas guide member 130. The air is guided toward the exhaust passage 173 and quickly merges with the exhaust gas flowing through the exhaust passage 173.

Thereafter, the exhaust gas flows into the exhaust passage 172 from the exhaust gas inlet 172a. In the exhaust passage 172, the exhaust gas flows in the exhaust passage 172 in the horizontal direction, and flows out from an exhaust port 111 formed at the center of the top plate 8a of the module container 8.
When the exhaust gas flows upward through the exhaust passage 173, heat is exchanged between the power generation air and the exhaust gas via the plate fins 163 provided in the air passage 161b. When the exhaust gas flows in the exhaust passage 172 in the horizontal direction, a plate fin 175 provided in the exhaust passage 172 and an air passage 161 corresponding to the plate fin 175 are provided.
Through the plate fins 162 provided in a, efficient heat exchange is performed between the power generation air and the exhaust gas. In this way, the power generation air is heated by the heat of the exhaust gas.

Then, the exhaust gas flowing out of the exhaust port 111 passes through an exhaust pipe 171 provided outside the module container 8 and flows into the exhaust passage 140A of the evaporator 140.
After passing through A, it is discharged from the evaporator 140 to the exhaust gas discharge pipe 82. When the exhaust gas flows through the exhaust passage section 140A of the evaporator 140, as described above, the mixing section 1 of the evaporator 140
Heat exchange is performed with the mixed gas in 40C and the water in the evaporating section 140B.

Next, the operation of the reformer of the first embodiment will be described with reference to FIGS. FIG. 14 is a partial cross-sectional view of the upper part of the fuel cell module of the solid oxide fuel cell device according to the first embodiment of the present invention, and FIG. 15 is an explanatory diagram of exhaust gas flowing around the reformer. , FIG.
6 and 17 are a side cross-sectional perspective view and a front cross-sectional perspective view of a reformer and an exhaust gas guiding member, respectively. FIG. 18 is an explanatory diagram of exhaust gas flowing through a through hole of the reformer.

As shown in FIG. 14, the power generation air supplied into the power generation chamber 10 moves upward (
The off-gas is burned in the combustion chamber 18 to become exhaust gas (see the broken arrow in FIG. 14). Reformer 1
When the through hole 120b is not formed in the module 20, the exhaust gas passes from the combustion chamber 18 only through the exhaust passage 173 (extending along the inner surface of the side plate 8b of the module container 8), and the exhaust gas in the module container 8 It will move towards the top. In this case, the flow distribution of the air for power generation is
With respect to the fuel cell assembly 12, the fuel cell unit 12 is biased toward both ends in the width direction when viewed from above, and the air supply to the fuel cell unit 16 in the central portion is not sufficient. There was a risk of deterioration.

Therefore, in the first embodiment, by providing the through hole 120b in the reformer 120, the exhaust passage 174 (from the through hole 120b of the reformer 120 to the reformer 120 and the exhaust gas guiding member 130) is provided.
And extending between them). Accordingly, in the first embodiment, the exhaust gas is branched from the combustion chamber 18 into the exhaust passage 174 and the exhaust passage 173, and can move toward the upper part in the module container 8 (see FIG. 15). ).

In the first embodiment, in particular, the exhaust gas flowing through the exhaust passage 174 rather than the exhaust passage 173 so that the flow ratio of the exhaust gas flowing through the exhaust passage 174 and the exhaust passage 173 becomes a predetermined value. The passage cross-sectional area of the exhaust passage 173, the passage cross-sectional area of the exhaust passage 174 above the reformer 120, the opening area of the through hole 120b, the corner R-shape, and the connecting recess described later are so increased that the flow rate of The dimensions are designed. Thereby, the reformer 120 and the fuel cell assembly 12
, The exhaust gas can be surely flown to the exhaust passage 174. For this reason, in the first embodiment, the flow of the air for power generation is not biased to the vicinity of both ends in the width direction of the fuel cell assembly 12 in a top view, and the flow of the air for power generation is caused by the flow of the exhaust gas. Therefore, unevenness in the air supply amount of the power generation air in the power generation chamber 10 is suppressed, and the flow of the power generation air is easily equalized.

In the first embodiment, the reformer 120 is heated from the side in the width direction by the exhaust gas passing through the exhaust passage 173 after being heated by the exhaust gas impinging on the bottom surface of the reformer 120. The exhaust gas passing through 120b is also heated from the center. Thus, the first
In this embodiment, the reformer 120 can be efficiently heated by the exhaust gas.

Further, in the first embodiment, the through hole 120b of the reformer 120 and the module container 8 are viewed from above.
Is formed so as to at least partially overlap with the exhaust port 111. More preferably, the exhaust port 111 is disposed at a central portion in the longitudinal direction and the width direction of the through hole 120b, which is a point symmetrical position of the through hole 120b in a top view. Further, the exhaust port 111 and the through hole 1 are viewed from the top.
Reference numeral 20b is disposed at the center of the fuel cell assembly 12.

If the exhaust port 111 is disposed in the width direction with respect to the through hole 120b in a top view, the flow of the exhaust gas from the through hole 120b to the exhaust port 111 is uneven at least in the width direction. Or it becomes asymmetric. With the flow of the exhaust gas, the flow of the power generation air also becomes uneven in the width direction. However, in the first embodiment, the exhaust port 1
11 and the through-hole 120b are arranged at the central portion of the module container 8 in a top view and overlap each other, so that the flow of the exhaust gas from the through-hole 120b to the exhaust port 111 is uniform at least in the width direction. And the flow of the air for power generation is also uniform in the width direction. The reformer 120 is also arranged at the center of the module container 8 when viewed from above. Thereby, the bias of the flow distribution of the power generation air is suppressed, and the power generation air can be sufficiently supplied to the fuel cell unit 16 substantially uniformly including the central portion and the vicinity of both ends. Deterioration of the cell unit 16 can be suppressed.

In the first embodiment, the flow rate of the exhaust gas is symmetrical (linearly symmetric) in the width direction of the reformer 120, that is, the flow rates of the exhaust passages 173 on both sides of the through hole 120b are equal. The through-hole 120b is formed line-symmetrically so as to divide the reformer 120 at least approximately equally in the width direction when viewed from above, so that the flow path distribution is not biased. In the first embodiment, the through holes 120b are formed in line symmetry so as to divide the reformer 120 in the longitudinal direction substantially equally in a top view.

In the first embodiment, as shown in FIGS. 16 and 17, the through-hole 120b of the reformer 120 is substantially oblong in a top view and formed to extend in the longitudinal direction. . The housing of the reformer 120 includes an upper case 121 and a lower case 122. In each of the upper case 121 and the lower case 122, connection concave portions 121a and 122a which are depressed inward so as to connect the through holes 120b from both ends in the width direction are formed. In the first embodiment, two connecting recesses 121a and 122a are formed separately from each other in the longitudinal direction.

When the exhaust gas rising from the combustion chamber 18 collides with the bottom surface of the lower case 122 of the reformer 120, the connecting recess 122a transfers the exhaust gas to both sides in the width direction, that is, the through holes 120b (the exhaust passage 174) and The module 8 is guided to an exhaust passage 173 along the side plate 8b. Thus, in the first embodiment, it is possible to positively supply the exhaust gas to the through-hole 120b without the flow of the exhaust gas being biased to the exhaust passage 173.

The connection recesses 121a and 122a protrude toward the internal space of the reformer 120. Specifically, the connection recesses 121a and 122a protrude toward the internal space so as to narrow the flow path of the reforming section 120B in the reformer 120. Therefore, the mixed gas is supplied to the connection recess 121.
a, 122a, while flowing through the reforming section 120B while changing the flow path,
The contact opportunity and contact time between the mixed gas and the reforming catalyst increase. Thus, in the first embodiment, the reforming efficiency of the mixed gas can be improved. Further, the temperature of the reforming catalyst is raised to a predetermined temperature by the exhaust gas flowing around the reformer 120. However, the contact opportunity and the contact time between the mixed gas and the reforming catalyst increase, so that the temperature of the reforming catalyst is raised. Thus, the mixed gas can be efficiently heated.

In the first embodiment, the upper case 121 and the lower case 122 are formed from the same original case member. That is, the original case member is formed by molding (for example, drawing) a metal material using a predetermined mold. And by processing the same original case member,
An upper case 121 and a lower case 122 are formed, respectively. For this reason, cost reduction and improvement in assemblability can both be achieved. Further, if the case of the reformer 120 is formed of one part, a bulky case cannot be formed by drawing, but in the first embodiment, the reformer 120 is not formed.
Is a two-part configuration with an upper case 121 and a lower case 122,
A bulky case can be formed. Therefore, when the volume is the same, a small reformer having a smaller bottom area can be obtained.

The upper case 121 and the lower case 122 are respectively provided with flange portions 121b and 121 on the outer peripheral side.
2b and inner peripheral flange portions 121c and 122c forming a through hole 120b, and these flange portions are welded and fixed in a state of being overlapped. Outer flange 121
b and 122b have the same width, and the welding operation can be easily performed from the side of the case. On the other hand, when the inner flange portions 121c and 122c have the same width, it is difficult to perform welding work on these flange portions from the side, resulting in poor assemblability. Therefore, in the first embodiment, the flange portion 121c on the inner peripheral side is
It is processed from the original case member so as to be narrower than 22c (see FIG. 17). For this reason, the flange portions 121c and 122c can easily perform welding work from the upper side using the steps of the flange portions, and can improve the assemblability.

Further, the upper case 121 and the lower case 122 are provided at the corners (the through holes 120b
Are formed into a curved shape so as to have an R shape having a predetermined radius of curvature (
16 and 15 (see broken line portion A). The radius of curvature is preferably from 1.0 mm to 30 mm. For this reason, in the first embodiment, when the gas passes through the inside of the reformer 120, the gas is prevented from staying in the corners, so that there is no dead space in the container and the reforming catalyst Gas can be easily distributed uniformly.

Further, a connection portion or a corner portion between the peripheral surface of the through hole 120b and the lower surface of the lower case 122 has an R-shape so as to have a predetermined radius of curvature over the peripheral edge (including the connection concave portion 122a) of the through hole 120b. (See broken line portion A in FIG. 17). That is, as shown in FIG. 18, the cross section of the case of the reformer 120 extends from the bottom surface of the reformer 120 to the peripheral surface of the through hole 120 b (
(Side), and has an R shape that is convex toward the outside.

Since the corner between the peripheral surface of the through hole 120b and the bottom surface of the lower case 122 is formed in a circular cross section having a predetermined radius of curvature, the exhaust gas that has collided with the lower case 122 can be discharged through the through hole 120b.
It becomes easy to be guided toward. Then, the air for power generation is also guided toward the through-hole 120b by the flow of the exhaust gas. However, when the radius of curvature is too large, the amount of power generation air guided to the through-hole 120b becomes too large, and the amount of power generation air passing through the outer peripheral side of the reformer 120 becomes too small. The distribution of the flow path of the air for power generation becomes uneven.

For this reason, in the first embodiment, the radius of curvature of the corner is set to 1.0 mm to 30 mm so that the flow ratio of the power generation air in the exhaust passage 173 and the exhaust passage 174 becomes an appropriate value. ,
Thereby, sufficient power generation air can be distributed to the fuel cell units 16 arranged in the central portion and the peripheral portion, respectively.

Next, the operation of the exhaust gas guide member of the first embodiment will be described with reference to FIG.
In the first embodiment, the evaporator 140 is arranged outside the module container 8, and this arrangement causes a local temperature decrease (including a temperature decrease of exhaust gas) due to the heat of evaporation of water in the module container 8. And the heat exchange between the exhaust gas and the air for power generation is performed more efficiently. Therefore, in the first embodiment, it is possible to avoid performing the heat exchange in the side portion of the fuel cell unit 16 and to perform the substantial heat exchange only in the limited portion near the top plate 8a of the module container 8. It is possible to do.

For this reason, in the first embodiment, the air passage 161a and the exhaust passage 172 are formed above and below the top plate 8a, and substantial heat exchange is performed in this portion. However, when the size of the apparatus is reduced, the area of the top plate 8a is also reduced, so that an area for performing sufficient heat exchange may not be secured. Therefore, the first embodiment is configured to achieve high heat exchange efficiency by maintaining the temperature difference between the exhaust gas at the inlet and the outlet of the exhaust passage 172 as large as possible.

For this reason, in the first embodiment, the exhaust gas guide member 130 is employed. The exhaust gas guiding member 130 collides the exhaust gas, which has risen through the through hole 120b, with the convex step 131a projecting downward so as to face the through hole 120b, and is directed in the width direction. It is quickly guided to the exhaust gas inlet 172a. Thus, the exhaust gas is quickly guided toward the exhaust gas inlet 172a without staying near the bottom surface of the exhaust gas guide member 130.

Since the exhaust passage 172 functioning as a heat exchange part is formed in the upper part of the exhaust gas guide member 130, the exhaust gas in the upper part of the exhaust gas guide member 130 is lower in temperature than the lower exhaust gas. Therefore, when the exhaust gas stays near the bottom surface of the exhaust gas guide member 130 in the exhaust passage 174, heat exchange occurs with the exhaust gas in the exhaust passage 172 via the exhaust gas guide member 130, and the exhaust passage 174 There is a possibility that the temperature of the exhaust gas in the interior may decrease. Further, the exhaust gas in the exhaust passage 174 may lose heat through the upper surface of the reformer 120 and the lower surface of the exhaust gas guide member 130. However, in the first embodiment, since the convex step 131a is provided on the bottom surface of the exhaust gas guide member 130, the high-temperature exhaust gas that has risen through the through-hole 120b of the reformer 120 can be exhausted. Since the gas can be guided to the side quickly without staying near the bottom surface of the gas guide member 130, it is possible to reach the exhaust gas inlet 172a while maintaining a high temperature.

Further, in the exhaust passage 172, the exhaust gas flows from both ends in the width direction (the exhaust gas inlet 172a which is the inlet of the exhaust passage 172) toward the center (in particular, the exhaust outlet 111 which is the outlet of the exhaust passage 172). At this time, since heat exchange with the air for power generation is performed, the exhaust gas guiding member 130
The temperature of the exhaust gas in the vicinity of the concave portion 132a (see the broken line portion A in FIG. 14) becomes the lowest. In particular, the temperature in the vicinity of the exhaust port 111 arranged at the central portion in the longitudinal direction of the concave portion 132a becomes the lowest. On the other hand, in the exhaust passage 174, the temperature above the through hole 120b of the reformer 120, that is, in the vicinity of the convex step 131a of the exhaust gas guide member 130 (see the broken line B in FIG. 14) is the highest.

The region of the broken line portion A where the temperature is the lowest and the region of the broken line portion B where the temperature is the highest (see FIG. 14)
Since it is located up and down via the exhaust gas guide member 130, the linear separation distance is small. For this reason, if heat exchange is performed between these regions, the exhaust gas inlet temperature may decrease. Therefore, in the first embodiment, a gas reservoir 135 (gas chamber) is formed in the case member of the exhaust gas guide member 130, and the gas reservoir 135 functions as a heat insulating material. Thus, in the first embodiment, heat exchange between the space above and below the exhaust gas guide member 130 (that is, the exhaust passage 172 and the exhaust passage 174), particularly between the regions indicated by broken lines A and B in FIG. Since the high-temperature exhaust gas that has passed through the through-hole 120b of the reformer 120 is prevented from lowering, the temperature of the high-temperature exhaust gas is prevented from dropping. The inlet temperature can be kept high.

Further, since the exhaust gas guide member 130 functions as a heat insulating material, the heat of the exhaust gas in the exhaust passage 172 is suppressed from being taken away by the exhaust gas guide member 130, and the exhaust gas in the exhaust passage 172 and the air passage 161a are prevented. Heat exchange with the power generation air can be promoted.
Further, in the exhaust passage 172, since the upper guide plate 132 of the exhaust gas guide member 130 functions as a heat reflecting plate, radiant heat from the upper guide plate 132 can be given to the exhaust gas and the air. Thereby, in the first embodiment, higher heat exchange efficiency in the heat exchange section can be achieved.

Further, the exhaust gas guide member 130 is formed of a member having heat conductivity (for example, a metal material or the like), and conducts heat itself. Therefore, when the high-temperature exhaust gas collides with the convex step 131a of the exhaust gas guiding member 130 and the convex step 131a is heated, the convex step 131a moves to another portion of the exhaust gas guiding member 130. Cannot completely shut off the heat conduction. For this reason, heat conduction to the upper surface of the exhaust gas guide member 130 may also occur. Then, on the upper surface of the exhaust gas guide member 130, the temperature difference between the upstream side and the downstream side of the exhaust passage 172 constituting the heat exchange part is reduced, which is disadvantageous for improving the heat exchange efficiency.

Therefore, in the first embodiment, the concave portion 132a is formed in a portion of the upper surface of the exhaust gas guide member 130 on the downstream side of the exhaust passage 172 where the temperature of the exhaust gas is lowest (that is, the central portion in the width direction). As a result, a portion through which the main stream portion of the exhaust gas passes in the exhaust passage 172 (the concave portion 13)
The distance between the passage height position other than the portion where 2a is formed and the height position where the plate fin 175 is located in FIG. 14) and the bottom surface of the recess 132a of the exhaust gas guide member 130 are increased. Accordingly, heat exchange between the exhaust gas and the exhaust gas guiding member 130 is less likely to occur at the downstream side of the exhaust passage 172, and heat conduction from the convex step 131a to the concave 132a is suppressed. That is, once the temperature of the recess 132a is increased by heat conduction, the recess 132a
Since heat exchange with the exhaust gas hardly occurs in the vicinity, the temperature of the concave portion 132a does not easily decrease. Thereby, in the first embodiment, higher heat exchange efficiency in the heat exchange section can be achieved.

Further, the mixed gas supply pipe 112 is connected to the reformer 120 from the exhaust port 111 through the inside of the module container 8. For this reason, the mixed gas in the mixed gas supply pipe 112 can be preheated in the module container 8, but this preheating removes the heat of the exhaust gas, which is disadvantageous for improving the heat exchange efficiency. Therefore, in the first embodiment, the heat exchange is performed by disposing the mixed gas supply pipe 112 in the concave portion 132a of the exhaust gas guide member 130 downstream of the exhaust passage 172 where the temperature of the exhaust gas is lowest. The temperature of the mixed gas supply pipe 112 is raised by the low-temperature exhaust gas after the heat exchange, not by the high-temperature exhaust gas before the heat exchange in the section. Thereby, the heat of the exhaust gas is prevented from being excessively taken by the mixed gas supply pipe 112, and the efficiency of preheating the mixed gas (heat exchange efficiency) can be reduced.

Next, the operation of the heat exchanger of the first embodiment will be described with reference to FIGS.
FIG. 19 is a cross-sectional view of a heat exchange unit of the solid oxide fuel cell device according to the first embodiment of the present invention, and FIG. 20 is an explanatory diagram of a connection portion between a top plate of a module container and an exhaust pipe. , FIG.
FIG. 22 is an explanatory diagram of a power generation air supply passage on a top plate of the module container, FIG. 22 is an explanatory diagram of an exhaust passage below the top plate of the module container, and FIG. 23 is a perspective view of a plate fin. 2
FIG. 4 is an explanatory view of a plate fin arranged between the side plate of the air passage cover and the side plate of the module container.

As shown in FIG. 19, the air passage cover 160 is attached to the module container 8 at a position slightly deviated to one end in the longitudinal direction (the right side in FIG. 19). Specifically, at the other end of the module container 8 in the longitudinal direction, the hydrogen extraction pipe 65 for the hydrodesulfurizer extends upward through the top plate 8a. The module container 8 is arranged so as to be shifted to one end in the longitudinal direction so as to avoid the hydrogen extraction pipe 65. This eliminates the need for the air passage cover 160 to have a through hole for penetrating the hydrogen removal pipe 65 for the hydrodesulfurizer. Further, when a through hole is provided in the air passage cover 160, the hydrogen extraction pipe 65 for the hydrodesulfurizer needs to be hermetically fixed by welding or the like in the through hole, but such a complicated processing step is not required. It becomes.

As shown in FIG. 19, an opening 165 is formed at the center of one end of the top plate 160 a of the air passage cover 160, and the flow path direction adjusting unit is formed so as to cover the opening 165. 164 are fixed. The power generation air flowing through the power generation air introduction pipe 74 is supplied to the air passage 161 a through the opening 165 via the flow direction adjustment unit 164. At least the supply side end of the power generation air introduction pipe 74 extends horizontally along the longitudinal direction of the top plate 160a of the air passage cover 160 (see FIG. 9). In the first embodiment, the supply-side end of the power generation air introduction pipe 74 extends in parallel with the top plate 160a or the top plate 8a, but may be angled so that the tip end is lowered.

The flow channel direction adjusting portion 164 is a flow channel member having a substantially semicircular attachment portion 164a for connecting the power generation air introduction pipe 74 and a convex flow channel portion 164b formed to protrude upward. It is attached so as to close the opening 165 of the top plate 160a. Convex channel portion 164
Reference numeral b denotes a cover member whose substantially semicircular cross section gradually decreases in a similar manner along the traveling direction of the air for power generation from the mounting portion 164a, and forms an air flow passage therein. Therefore, the upper surface of the internal air flow path becomes lower and the width thereof becomes narrower toward the front end. The lower part of the convex flow path 164b communicates with the air passage 161a via the opening 165.

The air passage 161a formed below the top plate 160a is formed so that the width dimension and the longitudinal dimension are large, but the height of the passage is low. For this reason, the distance (height of the passage) between the top plate 8a of the module container 8 and the top plate 160a of the air passage cover 160 is smaller than the diameter of the power generation air introduction pipe 74. It is difficult to connect the pipe 74 to the air passage cover 160 at the height of the air passage 161a, and even if it can be connected, the pressure loss increases.

Further, the power generation air introduction pipe 74 is disposed so as to extend in the vertical direction, and the opening 165 is formed from above.
When the air for power generation is supplied into the air passage 161a through the
It collides with the lower surface of 61a, and becomes difficult to disperse toward the side passage space. For this reason, it becomes difficult to uniformly supply the air for power generation to the entire area of the air passage 161a, and there is a portion where the heat exchange efficiency is locally reduced, so that the heat exchange efficiency is reduced as a whole.

Therefore, in the first embodiment, the supply-side end of the power generation air introduction pipe 74 is connected to the flow path direction adjustment unit 1.
It is connected to the top plate 160a of the air passage cover 160 through the center 64. With this configuration, it is possible to assemble the flow direction adjuster 164 as a separate member to the air passage cover 160, and to improve the assemblability of connecting the power generation air introduction pipe 74 to the air passage cover 160. You. In addition, it is possible to assemble the flow path direction adjusting portion 164 in the air passage cover 160 in advance, and then assemble the air passage cover 160 to the module container 8.

However, in this configuration, the power generation air introduction pipe 74 is positioned above the air passage 161a, and the direction of the power generation air introduction pipe 74 and the flow path in the air passage 161a are substantially parallel in the longitudinal direction component. However, they are separated in the vertical direction. For this reason, the flow path direction adjusting section 164 is formed such that the internal flow path height decreases as the distance from the supply-side end of the power generation air introduction pipe 74 increases. Accordingly, the convex flow path portion 164b gradually changes the flow direction of the power generation air supplied from the power generation air introduction pipe 74 downward, and the air passage 16
The air for power generation can be sent out to the air passage 161a at a gentle angle to the direction of the flow path 1a.

Further, the convex flow path portion 164b is formed so that the internal flow path height decreases and the internal flow path width decreases as the distance from the supply side end of the power generation air introduction pipe 74 increases. (See FIG. 9). Therefore, in the convex flow path portion 164b, the flow path cross-sectional area gradually decreases in the traveling direction. For this reason, the power generation air is gradually increased without receiving a large resistance in the flow path direction adjusting unit 164. Thus, the power-generating air supplied to the air passage 161a from one end in the longitudinal direction of the air passage cover 160 can reach the other end in the longitudinal direction of the air passage cover 160, and power is generated in the entire area of the air passage 161a. The working air can be supplied evenly.

Further, when the flow direction adjusting unit 164 is not used, the inflow area from the power generation air introduction pipe 74 to the air passage 161a having a low flow path height is small, so that the pressure loss increases as described above. However, by using the flow direction adjusting unit 164, a large inflow area can be secured. Therefore, in the first embodiment, the pressure loss is reduced and the air passage 161 is reduced.
In a, power generation air can be smoothly supplied to the other end in the longitudinal direction of the air passage cover 160.

In the air passage 161a, two air distribution members 166 are arranged substantially parallel to the both sides of the exhaust pipe 171 along the longitudinal direction of the module container 8 (see FIGS. 20 and 21). The plate fins 162 are disposed outside the air distribution member 166 in the width direction of the air passage 161a. Therefore, the plate fins 162 are disposed between the two air distribution members 166.
A space is formed in which there is no member (except the exhaust pipe 171) that becomes a resistance when the gas moves, such as 2.

The air distribution member 166 is a long member that extends so as to partition the air passage 161a over substantially the entire length range of the top plate 160a of the air passage cover 160 in the longitudinal direction. The air distribution member 166 has a large number of through holes formed at predetermined intervals in the longitudinal direction, and communicates the air passage 161a in the width direction with the through holes (see FIG. 19). Also, the air distribution member 1
Reference numeral 66 connects the top plate 8a and the top plate 160a (see FIG. 20).

As shown in FIG. 21, the power generation air supplied via the flow direction adjusting unit 164 is supplied to the two air distribution members 166 from one end (the right side in FIG. 21) of the air passage cover 160 toward the other end.
Flowing between Since there is no physical resistance such as a plate fin between the two air distribution members 166, the power generation air supplied into the air passage 161a with the flow velocity increased by the flow passage direction adjustment unit 164 is supplied to the air passage 161a. The other end of the cover 160 can be reached. Then, the power generation air moves in the width direction through the through hole of the air distribution member 166.

The power generation air passing through the through holes of the air distribution member 166 is supplied to the plate fins 162 and the top plate 8.
(a) Heat is exchanged with the exhaust gas through the plate fins 175 in the exhaust passage 172 to increase the temperature. Thereafter, the power generation air reaches both ends in the width direction of the air passage 161a, and is injected into the power generation chamber 10 from the outlet 8f formed in the side plate 8b of the module container 8 via the air passage 161b. .

The flow path direction adjusting part 164 is provided between the four end sides of the top plate 160a of the air passage cover 160.
It is arranged on an end side (side extending in the width direction) different from an end side (side extending in the longitudinal direction) communicating with the air passage 161b. For this reason, in the first embodiment, the power generation air is supplied in the width direction while being supplied in the air passage 161a on the top plate 8a in the longitudinal direction, and thereafter, is supplied to the air passage 161b on the side plate 8b. On the other hand, the air for power generation can be supplied evenly in the longitudinal direction.

In the first embodiment, the air passage covers 161a and 161b can be easily formed outside the module container 8 by assembling and fixing the air passage cover 160 from the outside of the module container 8 (see FIG. 9). Further, after the plate fins 162 and 163 are previously arranged on the top plate 8a and the side plate 8b of the module container 8, the air passage cover 160 can be arranged, and the assemblability of the plate fins 162 and 163 is good. .

Further, since the air passage cover 160 can be fixed to the module container 8 by applying mechanical welding from the outside, mass production can be achieved. In particular, in the first embodiment, since both the air passage cover 160 includes the rectangular top plate 160a and the side plate 160b, the outer contour is formed linearly, and the application of welding by an automatic machine is easy. .
As described above, in the first embodiment, the workability for forming the air passage is improved, and the manufacturing cost can be reduced.

Further, in the first embodiment, since only the exhaust passage needs to be formed in the module container 8, the manufacturing becomes easy. Further, since the exhaust passage is located inside the module container 8, it is possible to prevent the exhaust gas from leaking out of the module container 8. On the other hand, although the air passage is located outside the module container 8, even when airtightness of the air passage cannot be ensured, power generation air can only leak out of the module container 8.

In the first embodiment, as shown in FIG. 20, an exhaust pipe 171 is fixed to the exhaust port 111 of the top plate 8a of the module container 8. Therefore, the opening 1 of the air passage cover 160
By inserting the exhaust pipe 171 into the air container 67, the air passage cover 1
Since it is possible to position 60, good assemblability can be ensured.

Further, an annular portion 167a is formed in the opening 167 of the air passage cover 160 by bending the peripheral edge so as to protrude upward. Therefore, the annular portion 167a
The exhaust pipe 171 can be easily inserted into the opening 167 along the curved surface of.
Further, when the annular portion 167a and the exhaust pipe 171 are fixed, the annular portion 167a serves as a connection margin when welding is performed. For this reason, in the first embodiment, the opening 167 of the air passage cover 160 and the peripheral surface of the exhaust pipe 171 are more reliably fixed by welding as compared with the case where there is no connection margin like the annular portion 167a. Can be.
As described above, in the first embodiment, since the opening 167 is provided with the annular portion 167a that protrudes upward, the workability when assembling the air passage cover 160 to the module container 8 can be improved.

In the first embodiment, as described above, the substantial heat exchange is performed in the vicinity of the top plate 8a of the module container 8 while avoiding the heat exchange in the side portions of the fuel cell unit 16. And In this case, since the area of the top plate 8a is smaller than the area of the side plate 8b on the side of the fuel cell unit 16, there is a possibility that an area for performing sufficient heat exchange cannot be secured. However, in the first embodiment, a heat exchange distance extending member 176 is provided in addition to the exhaust gas guide member 130 so that sufficient heat exchange can be performed even in a small area.

As shown in FIG. 22, on the upper guide plate 132 of the exhaust gas guide member 130, plate fins 175 are arranged on both sides in the width direction with the mixed gas supply pipe 112 and the recess 132a interposed therebetween. Further, a heat exchange distance extending member 176 is arranged inside the plate fin 175 along the central side edge extending in the longitudinal direction. Two heat exchange distance extending members 176
Are arranged substantially parallel along the longitudinal direction and symmetrically with respect to the exhaust port 111. The heat exchange distance extending member 176 is a long plate-like member whose length is substantially half the length in the longitudinal direction of the top plate 8a, and a lower end portion thereof is fixed to the upper guide plate 132 and an upper end portion thereof. Are in contact with the top plate 8a (see FIG. 20).

Exhaust gas supplied from the exhaust passages 173 and 174 to the exhaust passage 172 via the exhaust gas inlet 172a is exhausted from an exhaust outlet 111 provided at a substantially central portion of the top plate 8a. Therefore, when the heat exchange distance extending member 176 is not provided, the flow of the exhaust gas flows directly from the exhaust gas introduction port 172a to the exhaust port 111, and the flow of the exhaust gas flows in a part of the exhaust passage 172. As a result, a sufficient amount of heat cannot be transmitted from the exhaust gas to the plate fins 175. As a result, heat exchange between the exhaust gas and the power generation air cannot be sufficiently performed.

Therefore, in the first embodiment, by arranging two heat exchange distance extending members 176 with the exhaust port 111 interposed therebetween, the exhaust gas is bypassed and guided to the exhaust port 111.
Specifically, the exhaust gas moves toward the center in the width direction of the exhaust passage 172 while passing through the plate fins 175 from the exhaust gas inlet 172a. However, since the heat exchange distance extending member 176 is disposed on both sides of the exhaust port 111 along the longitudinal direction, the exhaust gas collides with the heat exchange distance extending member 176, and one end or the other end in the longitudinal direction. To the space between the two heat exchange distance extending members 176, and further passes through this space to form the exhaust port 111.
To reach. As described above, in the first embodiment, the distance through which the exhaust gas flows in the exhaust passage 172 is extended by bypassing the heat exchange distance extending member 176 to the exhaust gas, and heat exchange is performed over the entire surface of the exhaust passage 172. It becomes possible. Thereby, a sufficient amount of heat can be transmitted from the exhaust gas to the power generation air in the air passage 161a, and as a result, the heat exchange efficiency between the exhaust gas and the power generation air can be improved.

Further, since the upper end portion of the heat exchange distance extending member 176 is in contact with the top plate 8a (see FIG. 20), the heat of the exhaust gas is directly transmitted to the top plate 8a, and Temperature for power generation can be raised.
Further, since the power generation air supplied to the air passage 161a collides with the outer peripheral wall of the exhaust pipe 171, the air density becomes higher around the exhaust pipe 171 than in other areas (broken line A in FIG. 20). ), The exhaust pipe 171 is cooled. On the other hand, the upper end of the heat exchange distance extending member 176 is
It is in contact with the top plate 8a near the exhaust pipe 171 (and the exhaust port 111) (see FIGS. 20 and 22). Therefore, heat conduction from the heat exchange distance extending member 176 to the exhaust pipe 171 whose temperature has been reduced is promoted, and the power generation air in the air passage 161a can be heated more efficiently.

Next, as shown in FIG. 23, the plate fins 162, 163, and 175 are formed by pressing a rectangular thin metal plate, and are formed at predetermined intervals on the flat portion 200 and the flat portion 200. , And protruding portions 202 that protrude toward both surface sides of the flat portion 200, respectively. The protruding part 202 is formed by cutting out a part of the plane part 200 and expanding it in a trapezoidal shape, and includes an inclined part 202a and a top plate part 202b. The inclined part 202a of the protruding part 202 and the top plate part 202b are separated from the flat part 200, and an opening 202c is formed in the separated part. In the plate fin thus formed, when the gas flows along both side surfaces of the flat portion 200, the gas and the flat portion 200 directly exchange heat, and also the gas flows into the projecting portion 20.
2, the gas and the protruding portion 202 perform heat exchange. This allows efficient heat exchange between the gas and the plate fins.

Further, the collision between the gas and the protruding portion 202 changes the gas flow direction. Specifically, the gas flow path is changed to the side by colliding with the outer surface (the surface opposite to the opening 202c) or the inner surface (the surface on the opening 202c side) of the inclined portion 202a of the protruding portion 202. You. This allows
The gas flows in the direction along the flow path as a whole, but locally flows in various directions and mixes with each other, so that the dispersibility is improved.

Further, as shown in FIG. 24, the plate fins 163 are arranged between the side plate 8b of the module container 8 and the side plate 160b of the air passage cover 160. Plate fin 163
Is in contact with the side plate 8b at the top plate portion 202b of the protruding portion 202, but is in contact with the side plate 160b via a protrusion 203 provided on the top plate portion 202b.

The protruding portion 203 is formed so that the contact area is smaller than that of the top plate portion 202b.
For example, it can be formed by projecting a part of the top plate 202b outward. Further, the protruding portion 203 can be a member separate from the plate fin having good thermal conductivity.
In this case, it is preferable to use a material having lower thermal conductivity than the plate fin.

The protrusions 203 are not provided on the top plate 202b of all the protrusions 202 on the side plate 160b side, but are provided on at least one top plate 202b. For this reason, the side plate 160
Among the protrusions 202 protruding toward b, most of the protrusions 202 do not contact the side plate 160b, and only one or a small number of the protrusions 202 contact the side plate 160b via the protrusion 203.

As described above, the plate fin 163 is in contact with the side plate 160b via the projection 203 having a small contact area and preferably having low thermal conductivity. Therefore, the plate fins 163
From the outside through the side plate 160b to the external heat insulating material 7 (heat loss), and the heat exchange efficiency between the exhaust gas in the exhaust passage 173 and the power generation air in the air passage 161b can be suppressed. It can be further improved. The same applies to the plate fins 162.

(Second embodiment)
Next, a second embodiment of the solid oxide fuel cell device 1 according to the present invention will be described with reference to FIGS.
This will be described with reference to FIG. 25A to 29A show the solid oxide fuel cell device 1 according to the first embodiment, and FIGS. 25B and 29C show the solid oxide fuel cell device according to the second embodiment. ing. In FIGS. 25 to 29, the same reference numerals are given to components having the same functions as in the first embodiment, and description thereof will be omitted.

First, the fuel cell module 2 described in the second embodiment ((b) and (c)) is different from the first embodiment in that the output is suppressed and the fuel cell module is compactly formed to meet various needs. Can be done. For example, the fuel cell module 2 of (b) has a fuel cell unit 16 in which a total of 78 cells of 6 × 13 are arranged, and is configured to be more compact than the first embodiment (see FIG. 26). Further, the fuel cell module 2 described in FIG.
And a total of 76 cells are arranged, and the fuel cell module 2 can be made thinner than in FIG. 26B (see FIG. 26).

Referring to FIG. 25, (b) and (c) are formed more compactly in the width direction (z direction) than (a). Further, as compared with (b), (c) is formed smaller in the width direction and longer in the depth direction (x direction), so that the fuel cell module 2 can be formed thinner with the same performance.

By the way, the operating temperature of the fuel cell unit 16 operates at a very high temperature of 700 to 1000 degrees, and the reformer 120 can be heated using the exhaust gas. That is, there is no need to separately provide heat for heating the reformer 120 from outside, and there is an advantage that high power generation efficiency can be obtained. However, as described above, the fuel cell unit 16
By reducing the total number of the components to reduce the size, there arises a problem caused by a decrease in the power generation heat and the combustion heat. That is, the calorific value of the fuel cell unit 16 and the fuel cell unit 1
When the amount of combustion in the upper part of the fuel cell 6 is small, not only the amount of heat for ensuring thermal independence is insufficient, but also reforming failure due to insufficient temperature rise is caused. To compensate for this shortage of heat by increasing the combustion heat in the upper part of the fuel cell unit 16, the fuel cell unit 16
Temperature unevenness occurs in the longitudinal direction of the fuel cell unit 16, which hinders the power generation performance of the fuel cell unit 16.

Furthermore, when the device is downsized, the flow path length and the flow path diameter are reduced, and the heat exchange distance is shortened,
The heat exchange performance between the air for power generation and the exhaust gas is reduced, such as a reduction in the heat exchange time due to an increase in the flow velocity of the gas flowing through the heat exchange passage, and this is one of the causes of the lack of heat. In addition, an increase in the flow velocity of the power generation air causes uneven supply of the power generation air to the fuel cell unit 16 and poor ignition. Further, since the size of the manifold 66 is similarly reduced, the internal space of the manifold 66 is also reduced, and the fuel gas may not be sufficiently dispersed and may be supplied to the fuel cell unit 16 unevenly. From the above, in a compact fuel cell module, it is required to solve various problems that occur with downsizing of the device.

Here, in the first embodiment (a), the second embodiment (b), and (c) shown in FIG. 25, the water is evaporated by the fuel supply pipe 63 being inclined and provided to the evaporator 140. It can be made easier to flow into the vessel 140. Therefore, even when the pressure on the inlet side of the evaporator 140 increases, the water easily flows down to the evaporator 140 due to the inclination, so that it is possible to stably supply water and fuel to the evaporator 140.

Further, a power generation air introduction pipe 74 for supplying power for power generation is disposed on the top plate 106a of the air passage cover 160 from one side so that the power generation air is blown onto the top plate 8a of the module container 8. It is configured. Further, below the module container 8, a bus bar 252 electrically connected to the plurality of fuel cell units 16 is drawn out of the module container 8, and takes out electricity.

FIG. 26 is a cross-sectional view of the module container 8 viewed from the x direction shown in FIG. (A
() Shows a sectional view of the first embodiment, and (b1), (b2) and (c) show sectional views of the second embodiment. Further, (b2) is different from (b1) in that the plate fins 17 on the exhaust side are used.
5 is an enlarged view of the arrangement position of the plate fin 163. FIG.

Generally, when trying to make a fuel cell device compact, the heat exchange distance between the exhaust gas and the air for power generation is also reduced at the same time, so that the heat of the exhaust gas cannot be effectively used and the heat utilization rate may be reduced. . Therefore, in the second embodiment shown in FIG.
By increasing the area of arrangement of (5) with respect to (b1), even if the heat exchange distance is shortened, the heat exchange is promoted by the plate fins 175. Does not drop.

In FIG. 26 (c), since the width direction of the top surface of the module container (x direction in FIG. 25) is small, the heat exchange distance on the top plate 8a of the module container 8 is extremely small. In this case, by increasing the installation distance of the plate fins 163 (by increasing the installation locations), the heat exchange amount does not decrease even if the heat exchange distance decreases.

As described above, even if the heat exchange distance is reduced due to the miniaturization, the plate fins 16
2, 163 and 175 can prevent the heat exchange performance from deteriorating. It should be noted that the shortened heat exchange distance may be compensated for by the arrangement location and the arrangement distance of the heat exchange promoting members such as the plate fins.

By the way, the fuel gas supply pipe 64 inside the manifold 66 and the top surface of the manifold 66 are supported by the support plate 260 inside the manifold. Here, since the fuel gas is jetted from the fuel gas supply pipe 64 to the inside of the manifold 66 so as to be sprayed on the bottom surface of the manifold 66, the support plate 262 becomes a barrier for gas dispersion inside the manifold 66. In particular, as shown in FIG. 26 (c), since the module container 8 itself is formed compact, the internal space of the manifold 66 is reduced, and the dispersion of the fuel gas is hindered. Therefore, according to the second embodiment, even in the compact fuel cell module 2 as shown in FIG. 26C, the support plate 262 ensures the gas passage area and the fuel gas supply pipe inside the manifold 66. It is possible to achieve compatibility with the support of the top surface of the manifold 64 and the manifold 66.

By the way, as shown in FIG. 26, the evaporator 140 has a substantially rectangular evaporator case 14 in a top view.
One. The evaporator case 141 is formed by joining two lower case-shaped rectangular upper and lower cases 142 and 143 with an intermediate plate 144 interposed therebetween. Evaporator heaters 250 are arranged on these joint surfaces along the joint surfaces, and the entire evaporator 140 can be efficiently heated from the joint surfaces of the three members.
In addition, since the top surface of the evaporator 140 and the height of the evaporator heater 250 are made equal to each other to form a flat surface, special processing on the bottom surface of the heat insulating material 7 arranged on the outer periphery of the evaporator 140 is performed. Can be unnecessary.

Although not shown, the fuel cell module described in the first embodiment (a) is replaced by the second embodiment (
b) In order to reduce the size and size of the fuel cell module described in (c), to adjust the flow of the internal gas that fluctuates due to this, or to fluctuate the amount of heat and temperature distribution that fluctuates due to this. In order to adjust, the flow path length and flow path diameter, the interval and shape of each component, etc. are appropriately corrected,
It is also preferable to use it after changing it.

FIG. 27 is a perspective view of the fuel cell module 2 from which the description of the air passage cover 160 is omitted. In the first embodiment (a), the second embodiment (b), and (c) of FIG. 27, the air supplied from the power generation air introduction pipe 74 is supplied to the air dispersion member 254 and the top plate 8a of the module container 8.
Flows into the air inflow chamber 256 formed between them. The air supplied to the air inflow chamber 256 is dispersed by coming into contact with the top plate 8a, and the air holes 25 provided in the air dispersion member 254 are provided.
8, while being in contact with the plate fins 162 and 163, the fuel is supplied from the outlet 8 f to the fuel cell unit 16. Here, the passage holes 258 provided in the air dispersion member 254 may supply the air flowing into the air inflow chamber 256 to the plate fins 162 in an arbitrary amount. Instead, it may be freely configured according to the size of the module container 8.

In addition, as compared with the perspective view (a) of the first embodiment in FIG. 27, the second embodiment (b) and (c) have different sizes of the module containers, so that the heat of the power generation air and the exhaust gas is different. If the exchange distances are different and compact as in the second embodiment (b) and (c), it is possible that sufficient heat exchange is not possible. Therefore, as shown in FIGS. 27B and 27C, by changing the arrangement and size of the plate fins 162 and 163, the amount of heat exchange between the power generation air and the exhaust gas can be controlled. That is, in (c) of FIG. 27, the z direction of the top plate 8a of the module container 8 is shortened, but there is no difference in the overall heat exchange efficiency by increasing the distance of the plate fin 163 in the y direction. It can be configured as follows.

Further, referring to FIG. 27, an outlet 8 f is provided on the side plate 8 b of the module container 8, and the air for power generation is supplied from the outlet 8 f to the fuel cell unit 16 arranged inside the module container 8. The Rukoto. According to the second embodiment, (b) and (c) of FIG.
In the case of the module containers having different sizes as in the case of (1), the flow rate of the air for power generation can be adjusted according to the location of the holes, the number of holes, or the size of the holes, thereby preventing uneven supply.

FIG. 28 is a perspective view of the fuel cell module 2 in the first embodiment (a) and the second embodiment ((b) and (c)). In FIG. 28A of the first embodiment, a power generation air introduction pipe 74 is disposed on one side of the module container 8 from the top plate 8a. Further, FIGS. 28 (b) and (c)
Referring to, the power generation air introduction pipe 74 is projected upward from the top plate 8a of the module container 8 as it is.

In the second embodiment ((b) and (c)), similarly to the first embodiment (a), a plurality of plates coated with a shape holding sheet for holding the shape of the fuel cell module container in a plate shape. Heat insulating material 1
000, and a portion where the plurality of plate-shaped heat insulating materials 1000 are in contact with each other is a fixing member 100
4 can be fixed to the module container. Thus, the shape of the module container,
The present invention can be applied even when the sizes are different, and it is particularly advantageous in terms of improving the lightness and workability when the weight or size of the module container is reduced.

Here, in common to FIGS. 28A, 28B and 28C, components provided inside the plate-shaped heat insulating material 1000 or the heat insulating material 7 provided inside (for example, a thermocouple or the like) And a restraining member 260 for ensuring flatness between the fuel cell module 2 and the top surface. The holding member 26
The location and shape of 0 are not limited to this.

FIG. 29 is a cross-sectional view as viewed from the x direction in FIG. 29 (a), (b) and (c) show the cross sections of the evaporator 140 so that the cross sections are different. First
In the embodiment (a), the second embodiment (b) and (c), the module container 8 in which the evaporator 140 is installed is covered with the heat insulating materials 7 and 7a and the plate heat insulating material 1000, and the module 100 is fixed by the fixing member 1004. It is fixed to the container 8. A bus bar 252 for extracting electric power is provided from below the fuel cell module 2.

By the way, as described above, since the flow velocity of the air for power generation tends to increase inside the module container 8, uneven air supply to the fuel cell unit 16, uneven temperature in the longitudinal direction, and poor ignition (defective fire transfer) ) Etc. will occur. Therefore, it is also preferable to increase the size of the upper support plate 100 shown in FIG. 26 to disturb the flow of the air for power generation and reduce the flow velocity. Further, although not shown, it is also preferable to stabilize the temperature unevenness and ignitability at the time of startup by lengthening the startup time of the fuel cell module 2, that is, by suppressing the supply amounts and flow rates of various gases.

INDUSTRIAL APPLICABILITY The solid oxide fuel cell device according to the present invention is widely useful in a solid oxide fuel cell device provided with a heat insulating material outside a module container.

DESCRIPTION OF SYMBOLS 1 Solid oxide fuel cell device 2 Fuel cell module 7, 7a Heat insulating material 8 Module container 8a Top plate 8b Side plate 8d, 8e Closed side plate 10 Power generation room 16 Fuel cell unit 18 Combustion chamber (combustion part)
63 fuel supply pipe 64 fuel gas supply pipe (fuel gas supply passage)
74 power generation air introduction pipe 82 exhaust gas discharge pipe 111 exhaust port 112 mixed gas supply pipe 120 reformer 120b through hole 130 exhaust gas guide member 131a convex step 132a concave 135 gas reservoir 140 evaporator 160 air passage cover 160a top Plate 160b Side plate 161a, 161b Air passage 162, 163 Plate fin 164 Flow direction adjusting unit 171 Exhaust pipe 172a Exhaust gas inlet 172 Exhaust passage 173 Exhaust passage (second exhaust passage)
174 exhaust passage (first exhaust passage)
175 Plate fin 176 Heat exchange distance extension member 250 Evaporator heater 252 Bus bar 254 Air dispersion member 256 Air inflow chamber 258 Passage hole 260 Suppression member 262 Support plate 1000 Plate heat insulation material 1000a Heat insulation material 1000b Shape retention sheet 1001 Heat insulation material 1002 Fuel cell Module 1003 Fuel supply pipe 1004 Fixing member 1005 Power generation air introduction pipe 1006 Temperature sensor 1009 Hydrogen removal pipe for hydrodesulfurizer 1010 Tray 1014 Combustion chamber 1016 Module container 1018 Fuel cell 1020 Ignition device (ignition heater)
1022 Heat radiating member A Location where two plate-shaped members contact B Location where three plate-shaped members contact

Claims (5)

A module container,
The module container is covered with a plurality of plate-shaped heat insulating materials covered with a shape holding sheet that holds a shape in a plate shape,
The portion where the plurality of plate-shaped heat insulating materials are in contact with each other is fixed to the module container by a fixing member, the fixing member has an L-shaped cross section, and the fixing member is each of the plate-shaped heat insulating materials. A solid oxide fuel cell module having a linear shape extending along a portion contacting with a solid oxide fuel cell module. The fixing member is provided so as to cover a portion where each of the plate-shaped heat insulating materials is in contact with the vicinity thereof, and the fixing member is fixed so as to crush the portion in contact with each of the plate-shaped heat insulating materials. The solid oxide fuel cell module according to claim 1, wherein: 2. The solid oxide fuel cell module according to claim 1, wherein a heat insulating material that is not covered by the shape maintaining sheet is disposed between the plate heat insulating material and the module container. 3. 4. The solid oxide fuel cell module according to claim 3, wherein the heat insulating material coated on the shape maintaining sheet of the plate heat insulating material is a heat insulating material containing fumed silica. 5. The solid oxide fuel cell module according to any one of claims 1 to 4, wherein the shape maintaining sheet is a glass cloth.

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