JP6752929B2 - Solid oxide fuel cell device - Google Patents

Description

The present invention relates to a solid oxide fuel cell apparatus including a plurality of fuel cell cells that generate electricity from a fuel gas and an oxidant gas.

A solid oxide fuel cell (Solid Oxide Fuel Cell: also referred to as "SOFC") uses an oxide ion conductive solid electrolyte as an electrolyte, has electrodes on both sides, and supplies fuel gas to one side. , A fuel cell that operates at a relatively high temperature by supplying an oxidizing agent gas (air, oxygen, etc.) to the other side.

In the solid oxide fuel cell apparatus, it is necessary to raise the temperature of the air supplied to the fuel cell in advance so that the fuel cell can generate electricity stably. Therefore, for example, as described in Patent Document 1, an exhaust passage through which exhaust gas generated by burning off-gas from the fuel cell is circulated is provided along the inner wall of the module container in which the fuel cell is housed. At the same time, an air passage is formed on the outer wall of the module container so as to exchange heat between the exhaust gas and the air.

Japanese Unexamined Patent Publication No. 2012-221659

Here, in recent years, miniaturization of the module container has been desired. When the module container is miniaturized, the heat exchangeable distance between the air passage and the exhaust passage becomes shorter. Therefore, as shown in FIG. 15, the air passage 300 and the exhaust passage 302 are formed so as to extend from the side wall 304A to the top surface 304B of the module container 304, respectively, and plate fins or the like are formed in the air passage 300 and the exhaust passage 302, respectively. Plate-shaped heat exchange promoting members 306 and 308 are provided. However, when such plate-shaped heat exchange promoting members 306 and 308 are provided, the portion along the side wall 304A and the portion along the top surface 304B are provided as separate members, and heat exchange occurs due to poor assembly work. The arrangement of the accelerator members 306 and 308 may be misaligned. In such a case, the heat exchange promoting members 306 and 308 come into contact with the side wall 304A of the module case and the case 310 constituting the air passage 300, as in the parts A and B in the drawing. In such a case, the gas flow turbulence occurs at the corner between the side surface and the top surface of the air passage 300 and the exhaust passage 302, and the pressure loss becomes high. Therefore, the heat exchange performance between the exhaust gas and the air deteriorates at the corners.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent the heat exchange performance from deteriorating even at the corners between the side surfaces of the air passage and the exhaust passage and the top surface.

The solid oxide type fuel cell device of the present invention is a solid oxide type fuel cell device that generates power by reacting the fuel gas obtained by reforming the raw material fuel gas with the air for power generation, and is electrically connected to each other. A fuel cell that generates electricity by reacting the fuel gas with the air for power generation, a module container, and a reformer that is arranged in the module container and generates fuel gas from the raw fuel gas by steam reforming. , A combustion part that burns fuel gas that did not contribute to the power generation of the fuel cell and heats the reformer with the generated exhaust gas, and is provided along the outer surface of the module container to supply air for power generation to the fuel cell. Exhaust gas flows to the exhaust port of the exhaust gas of the module container, which is provided along the inner surface of the module container and the air passage, and heat is exchanged between the air in the air passage across the module container and the exhaust gas flowing inside. The air passage and the exhaust passage are formed along the upper part of the top surface and the side wall surface of the module container, and at least one of the air passage and the exhaust passage has a heat exchange promoting member. The heat exchange promoting member is composed of a first surface along the side wall surface of the module container and a second surface along the top surface of the module container, and the first surface and the second surface are one. It is formed as a member.

According to the present invention having the above configuration, the heat exchange promoting member is formed as one member with a first surface along the side wall surface of the module container and a second surface along the top surface of the module container. It is possible to prevent the gas airflow from being disturbed due to improper assembly of the plurality of heat exchange promoting members, and to prevent the heat exchange performance from deteriorating at the corners between the side surface and the top surface. Further, since the heat exchange promoting member is integrally formed along the corner between the side surface and the top surface, even if the welding joint for attaching the heat exchange promoting member to the module container is removed, the heat exchange promoting member is promoted. Since the member is caught on the wall surface of the container, it is possible to prevent the heat exchange promoting member from falling off. Further, since the first surface and the second surface are formed as one member, the cost can be reduced by reducing the number of members, and the heat exchange promoting member can be easily attached.

In the present invention, preferably, the heat exchange promoting member is formed with a gas intake hole for passing exhaust gas or air between the inside and the outside of the heat exchange promoting member.
When the first surface along the side wall surface of the module container and the second surface along the top surface of the module container are formed as one member, the space opposite to the module container that exchanges heat with the heat exchange promoting member. The exhaust gas or air inside is difficult to exchange heat. On the other hand, according to the present invention having the above configuration, since the exhaust gas or air can flow between the module container side and the opposite side through the gas intake hole, heat exchange of all the exhaust gas or air Can be realized.

In the present invention, preferably, the module container is placed in the gas intake hole formed in the heat exchange promoting member provided on the other side of the air passage or the exhaust passage of the heat exchange promoting member provided on one of the air passage or the exhaust passage. Welding margins for spot welding are provided at positions facing each other across the.

The heat exchange promoting member is attached by spot welding, but since spot welding is performed with the two connecting members sandwiched between a pair of electrodes, the heat exchange promoting member of the air passage, the module container, and the exhaust passage are heat exchanged. Spot welding cannot be performed if the accelerator members overlap. On the other hand, according to the present invention having the above configuration, since the two members are in an overlapping state at the portion corresponding to the gas intake hole, the gas intake hole can be used as a space for spot welding, which is desired. Spot welding can be performed in place.

In the present invention, preferably, a flow hole through which exhaust gas can flow is formed in the center of the reformer, and the gas intake hole of the heat exchange promoting member provided in the exhaust passage is along the side wall surface of the module container. It is formed in the confluence region of the exhaust gas that has risen and the exhaust gas that has risen through the flow hole of the reformer.

According to the present invention having the above configuration, since the gas intake hole is provided in the confluence region of the exhaust gas rising along the side wall surface of the module container and the exhaust gas rising through the flow hole of the reformer, the exhaust gas is exhausted. Exhaust gas can be efficiently guided to the wall surface side of the module container in the passage.

In the present invention, preferably, the heat exchange promoting member provided in the exhaust passage is provided with gas intake holes on the first surface and the second surface.
According to the present invention having the above configuration, exhaust gas can be sent from either the first surface or the second surface to the wall surface side of the module container of the exhaust passage where heat exchange is performed.

In the present invention, preferably, the heat exchange promoting member provided in the air passage and the exhaust passage is provided with a gas intake hole at the boundary between the first surface and the second surface.
According to the present invention having the above configuration, the pressure loss at the corner between the side surface and the top surface can be further alleviated, and the heat exchange performance can be improved. Further, when a single plate-shaped member is bent to form a heat exchange promoting member, the bending operation can be easily performed. Since the bending operation can be easily performed in this way, the heat exchange promoting members can be stacked and stored without being bent until before mounting.

According to the present invention, the heat exchange performance can be prevented from deteriorating even at the corners between the side surface of the air passage or the exhaust passage and the top surface.

It is an overall block diagram which shows the solid oxide fuel cell apparatus (SOFC) by one Embodiment of this invention. It is a side sectional view which shows the fuel cell module of the solid oxide fuel cell apparatus by one Embodiment of this invention. It is sectional drawing along the line III-III of FIG. It is sectional drawing along the IV-IV line of FIG. It is an exploded perspective view of a module case and an air passage cover. (A) and (B) are perspective views showing a module case in a state where the air passage cover is removed when viewed from different angles. (A) is a perspective view showing a plate fin provided inside an air passage, and (B) is a perspective view showing a plate fin provided inside an exhaust passage. It is an enlarged perspective view which shows the 2nd surface of the plate fin provided in the air passage. It is a perspective view which shows the state of bending a plate fin. It is a schematic diagram which shows how the plate fin is attached to a module case by sputter welding. It is a partial cross-sectional view which shows the fuel cell unit of the solid oxide fuel cell apparatus by one Embodiment of this invention. FIG. 2 is a side sectional view showing a fuel cell module of a solid oxide fuel cell device according to an embodiment of the present invention, similar to FIG. 2. It is sectional drawing along the line III-III of FIG. 2 similar to FIG. It is sectional drawing along the IV-IV line of FIG. 2 similar to FIG. It is a vertical cross-sectional view which shows the heat exchange promotion member provided in the air passage and the exhaust passage of the conventional solid oxide fuel cell apparatus.

Next, the solid oxide fuel cell apparatus according to the embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an overall configuration diagram showing a solid oxide fuel cell device (SOFC) according to an embodiment of the present invention. As shown in FIG. 1, the solid oxide fuel cell device (SOFC) 1 according to the embodiment of the present invention includes a fuel cell module 2 and an auxiliary machine unit 4.

The fuel cell module 2 includes a housing 6, and a metal module case 8 is built in the housing 6 via a heat insulating material 7. In the power generation chamber 10 which is a lower part of the module case 8 which is a closed space, a fuel cell which performs a power generation reaction with a fuel gas and an oxidant gas (hereinafter, appropriately referred to as "air for power generation" or "air") The cell assembly 12 is housed. The fuel cell assembly 12 is configured by connecting a plurality of fuel cell units 16 (see FIG. 6) in series. In this example, the fuel cell assembly 12 has 128 fuel cell units 16.

A combustion chamber 18 as a combustion unit is formed above the power generation chamber 10 of the module case 8 of the fuel cell module 2, and the residue not used in the power generation reaction (does not contribute to power generation) in this combustion chamber 18. The fuel gas (off gas) and the residual air burn to generate exhaust gas (in other words, combustion gas). Further, the module case 8 is covered with the heat insulating material 7 to suppress the heat inside the fuel cell module 2 from being dissipated to the outside air. Further, a reformer 120 for reforming the fuel gas is arranged above the combustion chamber 18, and the reformer 120 is heated to a temperature at which the reforming reaction is possible by the combustion heat of the residual gas. There is.

Further, an evaporator 140 is provided in the heat insulating material 7 above the module case 8 in the housing 6. The evaporator 140 evaporates water to generate water vapor by exchanging heat between the supplied water and exhaust gas, and the mixed gas of the water vapor and the raw fuel gas (hereinafter referred to as "fuel gas"). (Sometimes called) is supplied to the reformer 120 in the module case 8.

Next, the auxiliary machine unit 4 stores a pure water tank 26 that stores water containing dew condensation of water contained in the exhaust from the fuel cell module 2 and turns it into pure water by a filter, and water supplied from the water storage tank. A water flow rate adjusting unit 28 (such as a "water pump" driven by a motor) for adjusting the flow rate of the water flow rate is provided. Further, the auxiliary machine unit 4 includes a gas shutoff valve 32 that shuts off the fuel supplied from the fuel supply source 30, which is a decrease in the supply of the raw material gas such as city gas, and a desulfurizer 36 for removing sulfur from the fuel gas. , A fuel flow rate adjusting unit 38 (such as a "fuel pump" driven by a motor) that adjusts the flow rate of fuel gas, and a valve 39 that shuts off the fuel gas flowing out of the fuel flow rate adjusting unit 38 in the event of power loss. There is. Further, the auxiliary machine unit 4 includes an electromagnetic valve 42 that shuts off the air supplied from the air supply source 40, a reforming air flow rate adjusting unit 44 that adjusts the air flow rate, and a power generation air flow rate adjusting unit 45 (with a motor). The driven "air blower" etc.), the first heater 46 that heats the reforming air supplied to the reformer 120, and the second heater 48 that heats the power generation air supplied to the power generation chamber. I have. These first heater 46 and second heater 48 are provided in order to efficiently raise the temperature at the time of start-up, but may be omitted.

In this embodiment, the partial oxidation reforming reaction (POX) and the steam reforming reaction (SR) are carried out from the POX step in which only the partial oxidation reforming reaction (POX) occurs in the reformer 120 when the apparatus is started. It may be configured so that the SR step in which only the steam reforming reaction occurs is performed through the ATR step in which the mixed auto-thermal reforming reaction (ATR) occurs, or the POX step is omitted and the ATR process is changed to the SR process. It may be configured so as to be migrated, or it may be configured so that only the SR step is performed by omitting the POX step and the ATR step. In the configuration in which only the SR process is performed, the reforming air flow rate adjusting unit 44 is unnecessary.

Next, the hot water production device 50 to which the exhaust gas is supplied is connected to the fuel cell module 2. Tap water is supplied to the hot water production apparatus 50 from the water supply source 24, and the tap water becomes hot water by the heat of the exhaust gas and is supplied to a hot water storage tank of an external water heater (not shown). Further, the fuel cell module 2 is provided with a control box 52 for controlling the supply amount of fuel gas and the like. Further, the fuel cell module 2 is connected to an inverter 54 which is a power extraction unit (power conversion unit) for supplying the electric power generated by the fuel cell module to the outside.

Next, the structure of the fuel cell module of the solid oxide fuel cell apparatus according to the embodiment of the present invention will be described with reference to FIGS. 2 to 6. FIG. 2 is a side sectional view showing a fuel cell module of a solid oxide fuel cell apparatus according to an embodiment of the present invention, and FIG. 3 is a sectional view taken along the line III-III of FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 2, FIG. 5 is an exploded perspective view of the module case and the air passage cover, and FIGS. 6 (A) and 6 (B) are viewed from different angles. It is a perspective view which shows the module case in the state which removed the air passage cover.

As shown in FIGS. 2 and 3, the fuel cell module 2 has a fuel cell assembly 12 and a reformer 120 provided inside a module case 8 covered with a heat insulating material 7, and also has a module case 8. It has an evaporator 140 provided outside and inside the heat insulating material 7.

First, as shown in FIG. 5, the module case 8 is composed of a substantially rectangular top plate 8a, a bottom plate 8c, and a pair of opposite side plates 8b connecting the sides extending in the longitudinal direction (left-right direction in FIG. 2). A closing side plate that closes the tubular body and the two opposing openings at both ends of the tubular body in the longitudinal direction, and connects the sides extending in the width direction (left-right direction in FIG. 3) of the top plate 8a and the bottom plate 8c. It consists of 8d and 8e.

In the module case 8, the top plate 8a and the side plate 8b are covered with the air passage cover 160. The air passage cover 160 has a top plate 160a and a pair of side plates 160b facing each other. An opening 167 for penetrating the exhaust pipe 171 and an opening 160c for penetrating the power generation air introduction pipe 74 are provided in a substantially central portion of the top plate 160a. The top plate 160a and the top plate 8a, and the side plate 160b and the side plate 8b are separated by a predetermined distance. As a result, between the outside of the module case 8 and the heat insulating material 7, specifically, between the top plate 8a and the side plate 8b of the module case 8 and the top plate 160a and the side plate 160b of the air passage cover 160, the top plate Air passages 161a and 161b as oxidant gas supply passages are formed along the outer surfaces of the plate 160a and the side plates 160b (see FIG. 3).

Further, an air distribution member 180 is arranged in the air passage 161a. The air distribution member 180 includes a top plate 180A having a rectangular shape in a plan view, a pair of side wall portions 180B extending downward from both edges of the top plate 180A, and a pair of side wall portions 180B laterally outward in the horizontal direction from the lower end edges. It has a base 180C extending to. The top plate 180A is formed with an exhaust pipe opening 180a at a position corresponding to the exhaust pipe 171 and an introduction opening 180b to which the power generation air introduction pipe 74 is connected at the center in the width direction.

A plurality of openings 180c are formed in each side wall portion 180B at predetermined intervals. The opening area of the opening 180c is different, and the closer to the introduction opening 180b connected to the air supply port of the power generation air introduction pipe 74, the smaller the opening area, and the farther from the introduction opening 180b, the larger the opening area. There is. Further, as will be described in detail later, the plurality of openings 180c are formed at positions below the main body 200 (FIG. 7) of the plate fin 162.

The air distribution member 180 is arranged so that the base 180C comes into contact with the upper surface of the top plate 8a of the module case 8 in a state where the exhaust pipe 171 is inserted through the opening 180a for the exhaust pipe. Further, the air distribution member 180 is arranged so that the pair of side wall portions 180B are located on the side of the pair of side plates 8b of the module case 8 and the opening 180c opens toward the side plate 8b of the module case 8. .. As a result, the top plate 8a of the module case 8, the top plate 180A of the air distribution member 180 facing the top plate 8a, and the pair of side wall portions 180B of the air distribution member 180 connecting the top plate 180A and the top plate 8a The air distribution chamber 182 surrounded by is defined. The air supply port of the power generation air introduction pipe 74 is connected to the introduction opening 180b formed in the top plate 180A of the air distribution member 180. The power generation air introduction pipe 74 extends from the second heater 48, and the end portion of the power generation air introduction pipe 74 extends in the vertical direction so that the air supply port faces the top plate 8a.

At the lower part of the side plate 8b of the module case 8, a plurality of through holes 8f are provided (see FIG. 5). The power generation air supplied from the power generation air introduction pipe 74 to the introduction opening 180b is introduced into the air distribution chamber 182 surrounded by the top plate 8a and the air distribution member 180. As will be described in detail later, the air distribution chamber 182 distributes the introduced power generation air to the air passage 161a through the plurality of openings 180c so as to spread over the entire air passage 161a. That is, the air distribution chamber 182 functions as an air distribution mechanism that distributes the power generation air so as to spread over the entire air passage 161a.
Then, the air for power generation is injected into the power generation chamber 10 from the outlet 8f toward the fuel cell assembly 12 through the air passages 161a and 161b along the outer walls of the top plate 8a and the side plate 8b of the module case 8. (See FIGS. 3 and 4).

Next, the evaporator 140 is fixed so as to extend in the horizontal direction on the top plate 8a of the module case 8. Further, a part 7a of the heat insulating material 7 is arranged between the evaporator 140 and the module case 8 so as to fill these gaps (see FIGS. 2 and 3).

Specifically, the evaporator 140 has a fuel supply pipe 63 that supplies water and raw fuel gas (may include reforming air) to one side end side in the longitudinal direction (left-right direction in FIG. 2). , An exhaust gas discharge pipe 82 (see FIG. 3) for discharging exhaust gas is connected, and an upper end portion of the exhaust pipe 171 is connected to the other end side in the longitudinal direction. The exhaust pipe 171 extends downward through the opening 167 formed in the top plate 160a of the air passage cover 160 and the exhaust pipe opening 180a of the air distribution member 180, and is formed on the top plate 8a of the module case 8. It is connected to the exhaust port 111. The exhaust port 111 is an opening for discharging the exhaust gas generated in the combustion chamber 18 in the module case 8 to the outside of the module case 8, and is formed at substantially the center of the top plate 8a having a substantially rectangular top view of the module case 8. Has been done.

Further, as shown in FIGS. 2 and 3, the evaporator 140 has a substantially rectangular evaporator case 141 when viewed from above. The evaporator case 141 is formed by joining two low-height bottomed rectangular tubular upper cases 142 and lower cases 143 with an intermediate plate 144 sandwiched between them.

Therefore, the evaporator case 141 has a two-layer structure in the vertical direction, and 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 fuel is supplied to the upper layer portion. An evaporation unit 140B that evaporates water supplied from the pipe 63 to generate water vapor, and a mixing unit 140C that mixes the water vapor generated by the evaporation unit 140B and the raw fuel gas supplied from the fuel supply pipe 63 are provided. ing.

The evaporation 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). Further, the evaporation portion 140B is filled with alumina balls (not shown).

Further, the exhaust passage portion 140A is similarly partitioned 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. Then, the second space is filled with a combustion catalyst (not shown). That is, the evaporator 140 of the present embodiment includes a combustion catalyst.

In such an evaporator 140, heat exchange is performed between the water in the evaporation section 140B and the exhaust gas passing through the exhaust passage section 140A, and the heat of the exhaust gas evaporates the water in the evaporation section 140B to generate water vapor. It will be generated. Further, heat exchange is performed between the mixed gas in the mixing portion 140C and the exhaust gas passing through the exhaust passage portion 140A, and the temperature of the mixed gas is raised by the heat of the exhaust gas.

Further, as shown in FIG. 2, a mixed gas supply pipe 112 for supplying the mixed gas to the reformer 120 is connected to the mixing unit 140C. The mixed gas supply pipe 112 is arranged so as to pass through the inside of the exhaust pipe 171 and has one end connected to the opening 144a formed in the intermediate plate 144 and the other end formed on the top surface of the reformer 120. It is connected to the mixed gas supply port 120a. The mixed gas supply pipe 112 passes through the exhaust passage portion 140A and the exhaust pipe 171 and extends vertically downward to the inside of the module case 8, where it is bent by approximately 90 ° and extends horizontally along the top plate 8a. , It is bent downward by approximately 90 ° and connected to the reformer 120.

Next, the reformer 120 is arranged above the combustion chamber 18 so as to extend horizontally along the longitudinal direction of the module case 8, and is interposed with the top plate 8a of the module case 8 via the exhaust gas guiding member 130. It is fixed to the top plate 8a in a state of being separated by a predetermined distance. The reformer 120 has a substantially rectangular outer shape when viewed from above, but is an annular structure in which a through hole 120b is formed in a central portion, and has a housing in which an upper case 121 and a lower case 122 are joined. ing. The through hole 120b is located so as to overlap the exhaust port 111 formed in the top plate 8a in a top view, and preferably the exhaust port 111 is formed at the center position of the through hole 120b.

On one end side (closed side plate 8e side of the module case 8) of the reformer 120 in the longitudinal direction, the mixed gas supply pipe 112 is connected to the mixed gas supply port 120a provided in the upper case 121, and the other end side (the other end side (the closed side plate 8e side) On the closed side plate 8d side), the fuel gas supply pipe 64 is connected to the lower case 122, and the hydrogen extraction pipe 65 for the hydrogenated desulfurizer extending to the desulfurizer 36 is connected to the upper case 121. Therefore, the reformer 120 receives the mixed gas (that is, the raw fuel gas mixed with water vapor (which may include reforming air)) from the mixed gas supply pipe 112, reforms the mixed gas internally, and reforms the mixed gas. It is configured to discharge the reformed gas (that is, fuel gas) from the fuel gas supply pipe 64 and the hydrogen extraction pipe 65 for the watering desulfurizer.

The reformer 120 has a mixed gas receiving unit 120A that receives the mixed gas from the mixed gas supply pipe 112 into the reformer 120 by partitioning the internal space into three spaces by two partition plates 123a and 123b. A reforming unit 120B filled with a reforming catalyst (not shown) for reforming the mixed gas, and a gas discharging unit 120C for discharging the gas that has passed through the reforming unit 120B are formed. (See FIG. 2). The reforming section 120B is a space sandwiched between the partition plates 123a and 123b, 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. Further, as the reforming catalyst, a catalyst in which nickel is added to the surface of an alumina sphere or a catalyst in which ruthenium is added to the surface of an alumina sphere is appropriately used.

The mixed gas supplied from the evaporator 140 via the mixed gas supply pipe 112 is ejected to the mixed gas receiving unit 120A through the mixed gas supply port 120a. This mixed gas is expanded in the mixed gas receiving section 120A to reduce the ejection speed, passes through the partition plate 123a, and is supplied to the reforming section 120B.

In the reforming section 120B, the mixed gas moving at a low speed is reformed into a fuel gas by the reforming catalyst, and this fuel gas passes through the partition plate 123b and is supplied to the gas discharging section 120C.
In the gas discharge unit 120C, the fuel gas is discharged to the fuel gas supply pipe 64 and the hydrogen extraction pipe 65 for the hydrogenated desulfurizer.

The fuel gas supply pipe 64 as the fuel gas supply passage extends downward along the closing side plate 8d in the module case 8, is bent by approximately 90 ° near the bottom plate 8c, and extends in the horizontal direction, and the fuel cell assembly 12 It enters the manifold 66 formed below the fuel cell 66, and further extends horizontally to the vicinity of the closing side plate 8e on the opposite side in the manifold 66. A plurality of fuel supply holes 64b are formed on the lower surface of the horizontal portion 64a of the fuel gas supply pipe 64, and fuel gas is supplied into the manifold 66 from the fuel supply holes 64b. A lower support plate 68 having a through hole for supporting the fuel cell unit 16 is attached above the manifold 66, and the fuel gas in the manifold 66 is supplied into the fuel cell unit 16. To. Further, an ignition device 83 for starting combustion of fuel gas and air is provided in the combustion chamber 18.

The exhaust gas guiding member 130 is arranged between the reformer 120 and the top plate 8a so as to extend horizontally along the longitudinal direction of the module case 8. The exhaust gas guiding member 130 includes a lower guiding plate 131 and an upper guiding plate 132 separated by a predetermined distance in the vertical direction, and connecting plates 133 and 134 to which both ends in the longitudinal direction are attached (FIGS. 2 and 2). (See FIG. 3). Both ends of the upper guide plate 132 in the width direction are bent downward and connected to the lower guide plate 131. The upper end of the connecting plates 133 and 134 is connected to the top plate 8a, and the lower end is connected to the reformer 120, whereby the exhaust gas guiding member 130 and the reformer 120 are fixed to the top plate 8a. There is.

The lower guide plate 131 is formed with a convex stepped portion 131a having a central portion in the width direction (left-right direction in FIG. 3) protruding downward. On the other hand, in the upper guide plate 132, like the lower guide plate 131, the concave portion 132a is formed so 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 recess 132a in the module case 8, then bends downward near the closing side plate 8e, penetrates the upper guide plate 132 and the lower guide plate 131, and penetrates the upper guide plate 132 and the lower guide plate 131. It is connected to the reformer 120.

In the exhaust gas guiding member 130, the gas reservoir (gas heat insulating layer) 135, which is an internal space that functions as a heat insulating layer, is formed by the upper guiding plate 132, the lower guiding plate 131, and the connecting plates 133, 134. The gas reservoir 135 communicates with the combustion chamber 18 in fluid communication. That is, the upper guide plate 132, the lower guide plate 131, and the connecting plates 133, 134 are connected so as to form a predetermined gap, and are not airtightly connected. Exhaust gas can flow into the gas reservoir 135 from the combustion chamber 18 during operation, and air can flow in from the outside when the gas reservoir 135 is stopped. However, as a whole, the movement of gas between the inside and outside of the gas reservoir 135 is It is gradual.

The upper guide plate 132 is arranged at a predetermined vertical distance from the top plate 8a, and the upper surface of the upper guide plate 132 and the top plate 8a are arranged horizontally along the longitudinal direction and the width direction. An extending first exhaust passage 172a is formed. The first exhaust passage 172a is juxtaposed with the air passage 161a with the top plate 8a of the module case 8 interposed therebetween.

The upper guide plate 132 is arranged at a predetermined horizontal distance from the side surface of the upper guide plate 132 and the side plate 8b, and is arranged in the longitudinal direction and the vertical direction between the side surface of the upper guide plate 132 and the side plate 8b. An extending second exhaust passage 172b is formed. The second exhaust passage 172b communicates with the first exhaust passage 172a at the upper part.

Inside the air passages 161a and 161b and the first and second exhaust passages 172a and 172b, heat exchange between the exhaust gas in the first and second exhaust passages 172a and 172b and the air in the air passages 161a and 161b is performed. Plate fins 162 and 175 are provided as heat exchange promoting members to promote the heat exchange (see FIG. 3). FIG. 7A is a perspective view showing the plate fins provided inside the air passage, and FIG. 7B is a perspective view showing the plate fins provided inside the exhaust passage. Further, FIG. 8 is an enlarged perspective view showing a second surface 162b of the plate fin 162 provided in the air passage. The plate fins 162 provided in the air passages 161a and 161b have a first surface 162a extending in the vertical direction between the side plate 8b of the module case 8 and the side plate 160b of the air passage cover 160, and the top plate 8a of the module case 8. A second surface 162b extending in the horizontal direction is provided between the air passage cover 160 and the top plate 160a of the air passage cover 160. The first surface 162a and the second surface 162b are continuous and are configured as an integral member. At the corners of the first surface 162a and the second surface 162b, four gas intake holes 162c extending along the corners are formed at intervals. Further, the second and third gas intake holes 175d of the plate fins 175 provided in the first and second exhaust passages 172a and 172b of the second surface 162b of the plate fins 162 provided in the air passages 161a and 161b. The regions 162d and 162e facing the module case 8 with the module case 8 interposed therebetween are provided with protruding portions 162d1 and 162e1 as welding margins to be coupled to the module case 8 by spot welding. The protruding portions 162d1 and 162e1 are portions that protrude toward the module case 8 side. The plate fins 162 are spot-welded to the module case 8 in a state where the first surface 162a is arranged along the side plate 8b of the module case 8 and the second surface 162b is arranged along the top plate 8a of the module case 8. It is installed.

As shown in FIG. 8, the second surface 162b of the plate fin 162 has a plate-shaped main body portion 200, a first protruding portion 204 protruding from one side, and a second protruding portion 202 protruding from the other side. Have.

Further, the first protruding portion 204 is composed of a pair of inclined portions 204a extending diagonally downward in the drawing and a connecting portion 204b connecting the lower ends of the pair of inclined portions 204a, respectively. A first passage hole 204c is formed at a position above the first protrusion 204 of the main body 200. Since the first protrusion 204 is formed below the first passage hole 204c, the air flow through the first passage hole 204c from the space below the second surface 162b to the space above the first passage hole 204c. It is impeded and causes a flow of air through the first passage hole 204c from the space above the second surface 162b to the space below.

The second protruding portion 202 is composed of a pair of inclined portions 202a extending diagonally upward in the drawing and a connecting portion 202b connecting the upper ends of the pair of inclined portions 202a, respectively. A second passing hole 202c is formed at a position below the second protruding portion 202 of the main body portion 200. Since the second protrusion 202 is formed above the second passage hole 202c, the flow of air through the second passage hole 202c from the space above the second surface 162b to the space below is obstructed. , A flow of air through the second passage hole 202c is triggered from the space below the second surface 162b to the space above.

Although the configuration of the second surface 162b of the plate fin 162 has been described with reference to FIG. 8, it is provided in the first surface 162a of the plate fin 162 and in the first and second exhaust passages 172a and 172b. The first surface 175a and the second surface 175b of the plate fin 175 have the same configuration as the second surface 162b of the plate fin 162.

The plate fins 175 provided in the first and second exhaust passages 172a and 172b have a first surface 175a extending in the vertical direction along the inner wall surface of the side plate 8b of the module case 8 and a top plate 8a of the module case 8. It is provided with a second surface 175b extending horizontally along the above. The first surface 175a and the second surface 175b are continuous and are configured as an integral member. At the corners of the first surface 175a and the second surface 175b, four first gas intake holes 175c extending along the corners are formed at intervals in the width direction. Further, on the first surface 175a of the plate fin 175, two second gas intake holes 175d extending in the width direction at a predetermined height position are formed at intervals. The height position of the second gas intake hole 175d is determined so as to be located at a height corresponding to the exhaust concentration portion 176 when the plate fin 175 is mounted in the module case 8. Further, on the second surface 175b of the plate fin 175, four third gas uptake holes 175e are formed in the vicinity of the corners at intervals.

The plate fins 175 are spot-welded to the module case 8 with the first surface 175b arranged along the side plate 8b of the module case 8 and the second surface 175b arranged along the top plate 8a of the module case 8. It is installed.

In the portion where the plate fins 162 of the air passages 161a and 161b are provided and the portion where the plate fins 175 of the first and second exhaust passages 172a and 172b are provided, the power generation air flowing through the air passages 161a and 161b and the first Efficient heat exchange is performed with the exhaust gas flowing through the second exhaust passages 172a and 172b, and the heat of the exhaust gas raises the temperature of the power generation air.

The plate fins 162 and 175 can be attached to the module case 8 as follows. FIG. 9 is a perspective view showing how the plate fins are bent, and FIG. 10 is a schematic view showing how the plate fins are attached to the module case by sputter welding.

The plate fins 162 and 175 are stored in a state where the first surfaces 162a and 175a and the second surfaces 162b and 175b are flat surfaces before the assembly of the solid oxide fuel cell device 1. Then, at the time of assembly, as shown in FIG. 9, the flat plate fins 162 and 175 are bent along the air intake holes 162c and 175c. At this time, since the air intake holes 162c and 175c are formed, it can be easily bent by human power.

Next, the plate fins 175 arranged in the first and second exhaust passages 172a and 172b are arranged so that the first and second surfaces 175a and 175b are along the side plates 8b and the top plate 8a of the module case 8. .. Then, as shown in FIG. 10A, electrodes 210 are attached to the outer surface of the module case 8 and the inner surface of the plate fin 175, respectively, and sputter welding is performed. As a result, the plate fins 175 are mounted in the module case 8.

Next, the plate fins 162 arranged in the air passages 161a and 161b are arranged so that the first and second surfaces 175a and 175b are along the side plates 8b and the top plate 8a of the module case 8. Then, as shown in FIG. 10B, electrodes 210 are attached to the outer surface of the plate fin 162 and the inner surface of the side plate 8b of the module case 8, respectively, and the first surface 162a of the plate fin 162 and the side plate 8b of the module case 8 are attached. And sputter welding. At this time, since the second gas intake hole 175d is formed at a position corresponding to the region of the plate fin 175 where the protruding portion 162d1 as the welding margin of the plate fin 162 is provided, the side plate of the module case 8 is formed. The electrode 210 can be attached to the inner surface of 8b. Similarly, one electrode is attached to the top plate 8a of the module case 8 through the third gas intake hole 175e of the plate fin 175, and the other electrode is attached to the protruding portion 162e1 as a welding margin of the plate fin 162. , Perform spatter welding. As a result, the second surface 162b of the plate fin 162 can be attached to the top plate 8a of the module case 8.
In the present embodiment, the second gas uptake holes 175d and the third gas uptake are formed in the first and second surfaces 175a and 175b of the plate fins 175 arranged in the first and second exhaust passages 172a and 172b. Holes 175e are provided, and the protruding portions 162d1 and 162e1 as welding margins of the plate fins 162 are spot-welded to the module case 8 through the second gas intake holes 175d and the third gas intake holes 175e. Not limited. Gas intake holes are provided in the first and second surfaces 162a and 162b of the plate fins 162 arranged in the air passages 161a and 161b, and welded to the plate fins 175 arranged in the first and second exhaust passages 172a and 172b. The plate fin 175 may be spot-welded to the module case 8 by providing a margin and utilizing the gas intake hole of the plate fin 162.

Further, the reformer 120 is arranged at a predetermined horizontal distance from the side plate 8b of the module case 8, and the exhaust gas is passed between the reformer 120 and the side plate 8b from the lower side to the upper side. 3 Exhaust passages 173 are formed.

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 located between the lower guide plate 131 and the upper case 121 and the reformer. The through hole 120b of 120 forms a fourth exhaust passage 174 through which the exhaust gas that has passed through the through hole 120b from below to above passes. The fourth exhaust passage 174 merges with the third exhaust passage 173 above the reformer 120 and in the vicinity of the side plate 8b, and an exhaust concentration portion 176 in which the exhaust gas is concentrated is formed.

Next, the fuel cell unit 16 will be described with reference to FIG. FIG. 11 is a partial cross-sectional view showing a fuel cell unit of a solid oxide fuel cell device according to an embodiment of the present invention.

As shown in FIG. 11, the fuel cell unit 16 includes a fuel cell 84 and inner electrode terminals 86 which are 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 forming a fuel gas flow path 88 inside, a cylindrical outer electrode layer 92, an inner electrode layer 90, and an outer side. It includes an electrolyte layer 94 between the electrode layer 92 and the electrode layer 92. The inner electrode layer 90 is a fuel electrode through which the fuel gas passes and has a (−) pole, while the outer electrode layer 92 is an air electrode in contact with air and has a (+) pole.

Since the inner electrode terminals 86 attached to the upper end side and the lower end side of the fuel cell 84 have the same structure, the inner electrode terminals 86 attached to the upper end side will be specifically described here. The upper 90a of the inner electrode layer 90 includes 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 connected to the outer peripheral surface 90b of the inner electrode layer 90 via a conductive sealing material 96, and further comes into direct contact with the upper end surface 90c of the inner electrode layer 90 to contact the inner electrode layer 90. It is electrically connected. A fuel gas flow path thin tube 98 communicating with the fuel gas flow path 88 of the inner electrode layer 90 is formed in the central portion of the inner electrode terminal 86.

The fuel gas flow path thin tube 98 is an elongated thin tube provided so as to extend in the axial direction of the fuel cell 84 from the center of the inner electrode terminal 86. Therefore, a predetermined pressure loss occurs in the flow of fuel gas flowing from the manifold 66 (see FIG. 2) into the fuel gas flow path 88 through the fuel gas flow path thin tube 98 of the lower inner electrode terminal 86. To do. Therefore, the fuel gas flow path thin tube 98 of the lower inner electrode terminal 86 acts as an inflow side flow path resistance portion, and the flow path resistance is set to a predetermined value. Further, a predetermined pressure loss also occurs in the flow of the fuel gas flowing out from the fuel gas flow path 88 through the fuel gas flow path thin tube 98 of the upper inner electrode terminal 86 to the combustion chamber 18 (see FIG. 2). Therefore, the fuel gas flow path thin tube 98 of the upper inner electrode terminal 86 acts as an outflow side flow path resistance portion, and the flow path resistance is set to a predetermined value.

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

The electrolyte layer 94 is composed 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, and lanthanum gallate doped with at least one selected from Sr and Mg. Formed from at least one of.

The outer electrode layer 92 is, for example, a lanthanum manganate doped with at least one selected from Sr and Ca, and a 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, etc. doped with at least one selected from.

In the fuel cell assembly 12, the inner electrode terminal 86 attached to the inner electrode layer 90 which is the fuel electrode of each fuel cell unit 16 is the outer electrode layer 92 which is the air electrode of another fuel cell unit 16. By being electrically connected to the outer peripheral surface, all 128 fuel cell units 16 are connected in series.

Next, with reference to FIGS. 12 to 14, the flow of gas in the fuel cell module of the solid oxide fuel cell apparatus according to the embodiment of the present invention will be described. FIG. 12 is a side sectional view showing a fuel cell module of a solid oxide fuel cell apparatus according to an embodiment of the present invention similar to FIG. 2, and FIG. 13 is a side sectional view of FIG. 2 III, which is similar to FIG. -A cross-sectional view taken along line III, FIG. 14 is a cross-sectional view taken along line IV-IV of FIG. 2 similar to FIG. In the figure, the solid line arrow indicates the fuel gas flow, the broken line arrow indicates the power generation air flow, and the alternate long and short dash line arrow indicates the exhaust gas flow.

As shown in FIG. 12, water and raw fuel gas (fuel gas) are placed in an evaporator 140B provided on the upper layer of the evaporator 140 from a fuel supply pipe 63 connected to one end side in the longitudinal direction of the evaporator 140. Be supplied. The water supplied to the evaporation section 140B is heated by the exhaust gas flowing through the exhaust passage section 140A provided in the lower layer of the evaporator 140 to become steam. The steam and the raw fuel gas supplied from the fuel supply pipe 63 flow in the downstream direction in the evaporation section 140B and are mixed in the mixing section 140C. The mixed gas in the mixing portion 140C is heated by the exhaust gas flowing through the lower exhaust passage portion 140A.

The mixed gas (fuel gas) formed in the mixing unit 140C is supplied to the reformer 120 in the module case 8 through the mixed gas supply pipe 112. Since the mixed gas supply pipe 112 passes through the exhaust passage portion 140A, the exhaust pipe 171 and the first exhaust passage 172a in this order, the mixed gas in the mixed gas supply pipe 112 is further heated by the exhaust gas flowing through these passages. Will be done.

The mixed gas flows into the mixed gas receiving section 120A in the reformer 120, passes through the partition plate 123a from here, 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 is branched from the gas discharge unit 120C into the fuel gas supply pipe 64 and the hydrogen extraction pipe 65 for the hydrogenated desulfurizer. Then, the fuel gas that has flowed into the fuel gas supply pipe 64 is supplied into the manifold 66 from the 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. Will be supplied.

Further, as shown in FIGS. 12 and 13, the air for power generation is blown downward from the air introduction pipe 74 for power generation toward the top plate 8a of the module case 8 into the air distribution chamber 182. The power generation air blown into the air distribution chamber 182 is introduced into the air passage 161a through the opening 180c of the air distribution member 180. At this time, the opening area of the opening 180c is smaller as it is closer to the air supply port of the power generation air introduction pipe 74, and is larger as it is farther from the air supply port. Therefore, substantially the same amount of power generation air is introduced into the air passage 161a from each opening 180c. The power generation air introduced into the air passage 161a flows along the top plate 8a of the module case 8 toward the upper edge of the pair of side plates 8b. At this time, the power generation air passing through the outside of the plate fin 162 receives less heat from the exhaust gas than the power generation air passing through the inside. However, since the gas intake hole 162c is provided at the corner of the plate fin 162, the power generation air that has reached the edge of the air passage 161a flows through the gas intake hole 162c inside and outside the plate fin 162. As a result, the air for power generation can be heated uniformly. The power generation air that has reached the edge of the air passage 161a is introduced into the air passage 161b. Then, it flows downward along the side plate 8b of the module case 8 in the air passage 161b.

When the air for power generation passes through the plate fins 162 in the air passages 161a and 161b, it passes through the first and second exhaust passages 172 and 173 formed in the module case 8 below the plate fins 162. Efficient heat exchange with the exhaust gas will result in heating. After that, the power generation air is injected into the power generation chamber 10 from the plurality of outlets 8f provided in the lower part of the side plate 8b of the module case 8 toward the fuel cell assembly 12.

Further, as shown in FIG. 13, the fuel gas that is not used for power generation in the power generation chamber 10 is burned in the combustion chamber 18 to become exhaust gas (combustion gas), and rises in the module case 8. Specifically, the exhaust gas branches into the third exhaust passage 173 and the fourth exhaust passage 174, and is between the outer surface of the reformer 120 and the side plate 8b of the module case 8 and the reformer 120. The through hole 120b passes between the reformer 120 and the exhaust gas guiding member 130, respectively. At this time, the exhaust gas passing through the fourth exhaust passage 174 is divided in the width direction by the convex step portion 131a arranged above the through hole 120b of the reformer 120, and does not stay at the lower part of the exhaust gas guiding member 130. It is guided toward the third exhaust passage 173 and joins the exhaust gas flowing through the third exhaust passage 173 at the exhaust concentration portion 176. Here, since the second gas intake hole 175d is formed on the first surface 175a of the plate fin 175 at a height position corresponding to the exhaust concentration portion 176, the module case 8 side of the second exhaust passage 172b is formed. Exhaust gas can be efficiently sent to.

After that, the exhaust gas introduced into the second exhaust passage 172b passes through the second exhaust passage 172b. At this time, the heat of the exhaust gas passing through the inside of the plate fin 175 is less likely to be transmitted to the air than the air for power generation passing through the outside. However, since the gas intake hole 175c is provided at the corner of the plate fin 175, the exhaust gas that has reached the upper end of the second exhaust passage 172b flows through the gas intake hole 175c inside and outside the plate fin 175. As a result, the heat of the exhaust gas can be efficiently transferred to the air for power generation. Then, the exhaust gas that has reached the upper end of the second exhaust passage 172b is introduced into the first exhaust passage 172a from the vicinity of the upper edge of the pair of side plates 8b of the module case 8. The exhaust gas that has passed through the first exhaust passage 172a is introduced into the exhaust port 111.

In this way, when the exhaust gas flows through the second exhaust passage 172b and the first exhaust passage 172a, the plate fins 175 provided in the second and first exhaust passages 172b and 172a and the air passages 161a and 161b are included. Efficient heat exchange is performed between the power generation air and the exhaust gas via the plate fins 162 provided in the portion corresponding to the plate fins 175 of the above. In this way, the heat of the exhaust gas raises the temperature of the power generation air.

Then, the exhaust gas flowing out from the exhaust port 111 passes through the exhaust pipe 171 provided outside the module case 8 and flows into the exhaust passage portion 140A of the evaporator 140, passes through the exhaust passage portion 140A, and then the evaporator. It is discharged from 140 to the exhaust gas discharge pipe 82. When the exhaust gas flows through the exhaust passage portion 140A of the evaporator 140, it exchanges heat with the mixed gas in the mixing portion 140C of the evaporator 140 and the water in the evaporator 140B as described above.

According to the above embodiment, the plate fins 162 and 175 include a first surface 162a and 175a along the side plate 8b of the module case 8 and a second surface 162b and 175b along the top plate 8a of the module case 8. Since it is formed as a member, it prevents the gas airflow from being disturbed due to improper assembly of a plurality of plate fins, and prevents the heat exchange performance from deteriorating at the corner between the side plate 8b and the top plate 8a. it can. Further, since the plate fins 162 and 175 are integrally formed along the corners between the side plate 8b and the top plate 8a, the welded joint for attaching the plate fins 162 and 175 to the module case 8 is temporarily removed. Also, since the plate fins 162 and 175 are caught on the wall surface of the module case 8, the plate fins 162 and 175 can be prevented from falling off. Further, since the first surfaces 162a and 175a and the second surfaces 162b and 175b are formed as one member, the cost can be reduced by reducing the number of members, and the plate fins 162 and 175 can be easily attached. become.

When the first surface 162a and 175a along the side plate 8b of the module case 8 and the second surface 162b and 175b along the top plate 8a of the module case 8 are formed as one member, heat is generated with respect to the plate fins 162 and 175. The exhaust gas or air in the space opposite to the module case 8 to be replaced becomes difficult to perform heat exchange. On the other hand, according to the above embodiment, exhaust gas or air can flow between the space on the module case 8 side and the space on the opposite side through the gas intake holes 162c, 175c, 175d, and 175e. Therefore, heat exchange of all exhaust gas or air can be realized.

Further, according to the present embodiment, the second and third plate fins 162 provided in the air passages 161a and 161b are formed in the plate fins 175 provided in the first and second exhaust passages 172a and 172b. Protruding portions 162d1 and 162e1 as welding margins for spot welding are provided at positions facing the gas intake holes 175d and 175e with the module case 8 interposed therebetween.

The plate fins 162 are attached by spot welding, but since spot welding is performed with the two members to be connected sandwiched between a pair of electrodes, the plate fins 162 of the air passages 161a and 161b, the module case 8, the first and the like If the plate fins 175 of the second exhaust passages 172a and 172b overlap, spot welding cannot be performed. On the other hand, according to the above embodiment, since the two members are in an overlapping state at the positions corresponding to the second and third gas intake holes 175d and 175e, the second and third gas intake holes 175d 175e can be used as a space for spot welding, and spot welding can be performed at a desired location.

Further, according to the present embodiment, a through hole 120b through which exhaust gas can flow is formed in the center of the reformer 120, and the second gas of the plate fins 175 of the first and second exhaust passages 172a and 172b. The intake hole 175d is formed in the exhaust concentration portion 176 of the exhaust gas rising along the side plate 8b of the module case 8 and the exhaust gas rising through the through hole 120b of the reformer 120. As a result, the exhaust gas can be efficiently guided to the side plate 8b side of the module case 8 of the exhaust passage 172b.

Further, according to the present embodiment, the plate fins 175 provided in the first and second exhaust passages 172a and 172b have the second and third gas intake holes 175d in the first surface 175a and the second surface 175b. 175e is provided. As a result, exhaust gas can be sent from either the first surface 175a or the second surface 175b to the side plate 8b side of the module case 8 of the exhaust passage 172b where heat exchange is performed.

Further, according to the present embodiment, the plate fins 162 and 175 provided in the air passages 161a and 161b and the exhaust passages 172a and 172b are located at the boundary between the first surface 162a and 175a and the second surface 162b and 175b. Gas intake holes 162c and 175c are provided. As a result, the pressure loss at the corner between the side surface and the top surface can be further alleviated, and the heat exchange performance can be improved. Further, when the plate fins 162 and 175 are formed by bending one plate-shaped member, the bending operation can be easily performed. Since the bending operation can be easily performed in this way, the plate fins 162 and 175 can be stacked and stored without being bent until before mounting.

1 Solid oxide type fuel cell device 2 Fuel cell module 4 Auxiliary unit 6 Housing 7 Insulation material 8 Module case 8a Top plate 8b Side plate 8c Bottom plate 8d Closed side plate 8e Closed side plate 8f Outlet 10 Power generation chamber 2 Fuel cell assembly 16 Fuel cell cell unit 18 Combustion chamber 24 Water supply source 26 Pure water tank 28 Water flow rate adjustment unit 30 Fuel supply source 32 Gas shutoff valve 36 Desmelter 38 Fuel flow rate adjustment unit 39 Valve 40 Air supply source 42 Electromagnetic valve 44 Reforming air Flow adjustment unit 45 Air flow adjustment unit for power generation 50 Hot water production equipment 52 Control box 54 Inverter 63 Fuel supply pipe 64 Fuel gas supply pipe 64a Horizontal part 64b Fuel supply hole 65 Hydrogen extraction pipe for watering desulfurizer 66 Manifold 68 Lower support plate 74 Air introduction pipe for power generation 82 Exhaust exhaust pipe 83 Ignition device 84 Fuel cell cell 86 Inner electrode terminal 88 Fuel gas flow path 90 Inner electrode layer 90a Upper 90b Outer surface 90c Upper end surface 92 Outer electrode layer 94 Electrolyte layer 96 Sealing material 98 Fuel gas Flow path thin tube 111 Exhaust port 112 Mixed gas supply pipe 120 Reformer 120A Mixed gas receiving part 120B Reforming part 120C Gas discharge part 120a Mixed gas supply port 120b Through hole 121 Upper case 122 Lower case 123a Partition plate 123b Partition plate 130 Exhaust gas guiding member 131 Lower guiding plate 131a Convex stepped portion 132 Upper guiding plate 132a Recessed 133 Connecting plate 135 Gas reservoir 140 Evaporator 140A Exhaust passage 140B Evaporating part 140C Mixing part 141 Evaporator case 142 Upper case 143 Lower case 144 Intermediate Plate 144a Opening 160 Air passage cover 160a Top plate 160b Side plate 160c Opening 161a Air passage 161b Air passage 162 Plate fin 162a First surface 162b Second surface 162c Gas intake hole 167 Opening 171 Exhaust pipe 172a First exhaust passage 172b Second exhaust passage 175 Plate fin 175a First surface 175b Second surface 175c First gas intake hole 175d Second gas intake hole 175e Third gas intake hole 176 Exhaust concentration part 180 Air distribution member 180A Top plate 180B Side wall 180C Base 180a Exhaust pipe opening 180b Introduction opening 180c Open 182 Air distribution chamber 200 Main body 202 Protruding 202a Inclined 202b Connecting 202c Passing hole 204 Protruding part 204a Inclined part 204b Connecting part 204c Passing hole 210 Electrode 300 Air passage 302 Exhaust passage 304 Module container 304A Side wall 304B Top surface 306 Heat exchange promoting member 310 Case

Claims (6)

A solid oxide fuel cell device that generates electricity by reacting fuel gas obtained by reforming raw fuel gas with air for power generation.
A fuel cell that is electrically connected to each other and generates electricity by the reaction of the fuel gas and the air for power generation.
Module container and
A reformer arranged in the module container and generating the fuel gas from the raw material fuel gas by steam reforming,
A combustion unit that burns fuel gas that did not contribute to the power generation of the fuel cell and heats the reformer with the generated exhaust gas.
An air passage provided along the outer surface of the module container to supply the power generation air to the fuel cell, and
The exhaust gas is provided along the inner surface of the module container, and the exhaust gas flows to the exhaust port of the exhaust gas of the module container, and heat exchange between the air in the air passage and the exhaust gas flowing inside the module container. Is equipped with an exhaust passage,
The air passage and the exhaust passage are formed along the upper portions of the top surface and the side wall surface of the module container.
A heat exchange promoting member is provided in at least one of the air passage and the exhaust passage.
The heat exchange promoting member includes a first surface along the side wall surface of the module container and a second surface along the top surface of the module container, and the first surface and the second surface. Is a solid oxide fuel cell device formed as one member. The heat exchange promoting member is formed with gas intake holes for passing exhaust gas or air between the inside and the outside of the heat exchange promoting member.
The solid oxide fuel cell device according to claim 1. The module container is sandwiched between gas intake holes formed in the air passage or the heat exchange promoting member provided on the other side of the exhaust passage of the heat exchange promoting member provided on one of the air passage or the exhaust passage. Welding margins for spot welding are provided at the positions facing each other.
The solid oxide fuel cell device according to claim 2. A distribution hole through which the exhaust gas can flow is formed in the center of the reformer.
The gas intake hole of the heat exchange promoting member provided in the exhaust passage is a confluence of the exhaust gas rising along the side wall surface of the module container and the exhaust gas rising through the flow hole of the reformer. Formed in the area,
The solid oxide fuel cell device according to claim 3. The solid oxide fuel cell device according to claim 4, wherein the heat exchange promoting member provided in the exhaust passage is provided with gas intake holes on the first surface and the second surface. The solid oxide according to claim 4, wherein the heat exchange promoting member provided in the air passage and the exhaust passage is provided with a gas intake hole at the boundary between the first surface and the second surface. Type fuel cell device.

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