JP2018018701A - Solid oxide fuel cell device - Google Patents

Abstract

An object of the present invention is to prevent heat exchange performance from being deteriorated even at a corner portion between a side surface of an air passage or an exhaust passage and a top surface. Air passages 161a and 161b and exhaust passages 172a and 172b are formed along top portions of a top plate 8a and a side plate 8b of a module case 8. The air passages 161a and 161b and the exhaust passages 172a and 172b include Plate fins 162 and 175 are provided, respectively. The plate fins 162 and 175 are first surfaces 162a and 175a along the side plate 8b of the module case 8, and second surfaces 162b along the top plate 8a of the module case 8. 175b, and the first surfaces 162a and 175a and the second surfaces 162b and 175b are formed as one member. [Selection] Figure 4

Description

  The present invention relates to a solid oxide fuel cell device including a plurality of fuel cells that generate power using fuel gas and oxidant gas.

  A solid oxide fuel cell device (hereinafter also referred to as “SOFC”) uses an oxide ion conductive solid electrolyte as an electrolyte, has electrodes attached to both sides thereof, and supplies fuel gas to one side. The fuel cell operates at a relatively high temperature by supplying an oxidant gas (air, oxygen, etc.) to the other side.

  In the solid oxide fuel cell device, it is necessary to raise the temperature of air supplied to the fuel cell in advance so that the fuel cell can stably generate power. Therefore, for example, as described in Patent Document 1, an exhaust passage through which exhaust gas generated by burning off-gas from a fuel battery cell circulates along an inner wall of a module container in which the fuel battery cell is accommodated. While being provided, an air passage is formed in the outer wall of the module container so that heat exchange is performed between the exhaust gas and the air.

JP 2012-221659 A

  Here, in recent years, miniaturization of module containers has been desired. When the module container is reduced in size, the heat exchangeable distance between the air passage and the exhaust passage is shortened. For this reason, 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. Plate-shaped heat exchange promoting members 306 and 308 are provided. However, in the case where such plate-like 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 promotion members 306 and 308 may be shifted. 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 A part and the B part in the figure. In such a case, the gas flow is disturbed at the corners between the side surfaces of the air passage 300 and the exhaust passage 302 and the top surface, and the pressure loss becomes high. For this reason, the heat exchange performance between exhaust gas and air is reduced 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 heat exchange performance from being deteriorated even at a corner portion between the side surface of the air passage or the exhaust passage and the top surface.

  The solid oxide fuel cell device of the present invention is a solid oxide fuel cell device that generates electric power by reaction between fuel gas obtained by reforming raw fuel gas and power generation air, and is electrically connected to each other. A plurality of fuel cells connected to the fuel gas and generating power by reaction of the power generation air, a module container containing the plurality of fuel cells, and disposed in the module container, and the raw fuel gas by steam reforming A reformer that generates fuel gas from a combustion section that burns fuel gas that did not contribute to power generation of a plurality of fuel cells at the top of the fuel cell and heats the reformer with the generated exhaust gas; An air passage is provided along the outer surface of the module container to supply power generation air to a plurality of fuel cells, and an exhaust passage is provided along the inner surface of the module container to the exhaust port of the module container. An exhaust passage in which heat is exchanged between the air in the air passage and the exhaust gas flowing inside the module container, the air passage and the exhaust passage being at the top of the top surface and the side wall surface of the module container The air passage and the exhaust passage are each provided with a heat exchange promoting member, and the heat exchange promoting member includes a first surface along a side wall surface of the module container and a top surface of the module container. The first surface and the second surface are formed as one member.

  According to the present invention having the above-described configuration, the heat exchange promoting member is formed as a single member with the first surface along the side wall surface of the module container and the second surface along the top surface of the module container. It is possible to prevent the turbulence of the gas flow from occurring due to poor assembly of the plurality of heat exchange promoting members, and to prevent the heat exchange performance from being deteriorated at the corner portion between the side surface and the top surface. In addition, since the heat exchange promoting member is integrally formed along the corner between the side surface and the top surface, even if the weld joint for attaching the heat exchange promoting member to the module container is disconnected, the heat exchange promoting is performed. Since the member is caught on the container wall surface, it is possible to prevent the heat exchange promoting member from falling off. Moreover, since the first surface and the second surface are formed as one member, the cost can be reduced due to the reduction in 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 through which exhaust gas or air passes 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 performs heat exchange with respect to 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-described configuration, exhaust gas or air can flow between the module container side and the opposite side through the gas intake hole. Can be realized.

  In the present invention, preferably, the module container is inserted into the gas intake hole formed in the heat exchange promoting member provided in the other of the air passage or the exhaust passage of the heat exchange promoting member provided in one of the air passage or the exhaust passage. A welding margin for spot welding is provided at a position opposed to each other.

  The heat exchange promoting member is attached by spot welding, but since spot welding is performed with two members to be connected sandwiched between a pair of electrodes, heat exchange promoting member for the air passage, module container, and heat exchange for the exhaust passage If the accelerating member overlaps, spot welding cannot be performed. On the other hand, according to the present invention having the above-described configuration, the two members are overlapped at the location where the gas intake hole is hit, so that the gas intake hole can be used as a spot welding space, 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 extends along the side wall surface of the module container. And the exhaust gas that has risen through the flow hole of the reformer is formed in a confluence region.

  According to the present invention having the above-described configuration, the gas intake hole is provided in the confluence region of the exhaust gas that has risen along the side wall surface of the module container and the exhaust gas that has risen through the flow hole of the reformer. The exhaust gas can be efficiently induced 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-described configuration, exhaust gas can be sent from either the first surface or the second surface to the wall surface side of the module container in 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 this invention of the said structure, the pressure loss in the corner | angular part between a side surface and a top | upper surface can further be relieve | moderated, and heat exchange performance can be improved. Further, when a plate-like member is bent to form the heat exchange promoting member, the bending operation can be easily performed. Since the folding operation can be easily performed in this manner, the heat exchange promoting member can be stacked and stored without being bent until before installation.

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

1 is an overall configuration diagram showing a solid oxide fuel cell apparatus (SOFC) according to an embodiment of the present invention. It is side surface sectional drawing which shows the fuel cell module of the solid oxide fuel cell apparatus by one Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. It is a disassembled perspective view of a module case and an air passage cover. (A), (B) is a perspective view which shows the module case of the state which removed the air passage cover seen from a different angle. (A) is a perspective view which shows the plate fin provided in the inside of an air passage, (B) is a perspective view which shows the plate fin provided in the inside of an exhaust passage. It is a perspective view which expands and shows the 2nd surface of the plate fin provided in the air path. It is a perspective view which shows a mode that a plate fin is bent. It is a schematic diagram which shows a mode that a plate fin is attached to a module case by sputter welding. It is a fragmentary sectional view showing a fuel cell unit of a solid oxide fuel cell device by one embodiment of the present invention. FIG. 3 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. FIG. 4 is a cross-sectional view along the line III-III in FIG. 2, similar to FIG. 3. FIG. 5 is a cross-sectional view taken along line IV-IV in FIG. 2 similar to FIG. 4. It is a vertical sectional view showing a heat exchange promoting member provided in an air passage and an exhaust passage of a conventional solid oxide fuel cell device.

  Next, a solid oxide fuel cell device according to an 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 apparatus (SOFC) according to an embodiment of the present invention. As shown in FIG. 1, a solid oxide fuel cell apparatus (SOFC) 1 according to an embodiment of the present invention includes a fuel cell module 2 and an auxiliary 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 the lower part of the module case 8, which is a sealed space, a fuel cell that performs a power generation reaction with fuel gas and oxidant gas (hereinafter referred to as “power generation air” or “air” as appropriate). A cell assembly 12 is accommodated. The fuel cell assembly 12 includes a plurality of fuel cell units 16 (see FIG. 6) connected in series. In this example, the fuel cell assembly 12 has 128 fuel cell units 16.

  A combustion chamber 18 as a combustion section is formed above the power generation chamber 10 of the module case 8 of the fuel cell module 2. In this combustion chamber 18, the remainder that was not used for the power generation reaction (which did not contribute to power generation) The fuel gas (off-gas) and the remaining air are combusted 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 diffused to the outside air. Further, a reformer 120 for reforming the fuel gas is disposed above the combustion chamber 18, and the reformer 120 is heated to a temperature at which a reforming reaction can be performed by the combustion heat of the residual gas. Yes.

  Further, an evaporator 140 is provided in the heat insulating material 7 above the module case 8 in the housing 6. The evaporator 140 performs heat exchange between the supplied water and the exhaust gas, thereby evaporating the water to generate water vapor, and a mixed gas (hereinafter referred to as “fuel gas”) of the water vapor and the raw fuel gas. Is supplied to the reformer 120 in the module case 8.

  Next, the auxiliary unit 4 stores pure water tank 26 that stores water condensed from moisture contained in the exhaust from the fuel cell module 2 and makes it pure water with a filter, and water supplied from the water storage tank. Is provided with a water flow rate adjusting unit 28 (such as a “water pump” driven by a motor). The auxiliary unit 4 includes a gas shutoff valve 32 that shuts off the fuel supplied from the fuel supply source 30 that is a reduction in the supply of raw material gas such as city gas, and a desulfurizer 36 that removes sulfur from the fuel gas. A fuel flow rate adjusting unit 38 (such as a “fuel pump” driven by a motor) for adjusting the flow rate of the fuel gas, and a valve 39 for shutting off the fuel gas flowing out from the fuel flow rate adjusting unit 38 when the power is lost. Yes. Further, the auxiliary 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). Driven "air blower", etc., a first heater 46 for heating the reforming air supplied to the reformer 120, and a second heater 48 for heating the power generating air supplied to the power generation chamber. I have. The first heater 46 and the second heater 48 are provided in order to efficiently raise the temperature at startup, but may be omitted.

  In this embodiment, the partial oxidation reforming reaction (POX) and the steam reforming reaction (SR) are performed from the POX process in which only the partial oxidation reforming reaction (POX) occurs in the reformer 120 when the apparatus is started. The SR process in which only the steam reforming reaction is performed may be performed through the ATR process in which the mixed autothermal reforming reaction (ATR) occurs, or the POX process may be omitted and the ATR process may be changed to the SR process. You may comprise so that it may transfer, and it may comprise so that a POX process and an ATR process may be abbreviate | omitted and only an SR process may be performed. In the configuration in which only the SR step is performed, the reforming air flow rate adjustment unit 44 is unnecessary.

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

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

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

  First, as shown in FIG. 5, the module case 8 includes a substantially rectangular top plate 8a, bottom plate 8c, and a pair of opposing side plates 8b that connect the sides extending in the longitudinal direction (left and right direction in FIG. 2). A cylindrical body and a closed side plate that closes two opposing openings at both ends in the longitudinal direction of the cylindrical body and connects the sides extending in the width direction of the top plate 8a and the bottom plate 8c (left and right direction in FIG. 3) 8d and 8e.

  The module case 8 has a top plate 8 a and side plates 8 b covered with an air passage cover 160. The air passage cover 160 includes a top plate 160a and a pair of opposing side plates 160b. An opening 167 for passing through the exhaust pipe 171 and an opening 160c for passing through the power generation air introduction pipe 74 are provided at 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. Thereby, 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 between the top plate 160a and the side plate 160b of the air passage cover 160, 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).

  An air distribution member 180 is disposed in the air passage 161a. The air distribution member 180 is horizontally outward from a top plate 180A having a rectangular shape in plan view, a pair of side wall portions 180B extending downward from both edge portions of the top plate 180A, and a lower edge of the pair of side wall portions 180B. And a base portion 180 </ b> C extending in the direction. The top plate 180A has 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 at predetermined intervals in each side wall portion 180B. The opening areas of the openings 180c are different from each other. 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. Yes. Moreover, as will be described in detail later, the plurality of openings 180c are formed at positions lower than the main body 200 (FIG. 7) of the plate fin 162.

  The air distribution member 180 is disposed such that the base portion 180 </ b> C contacts the top surface of the top plate 8 a of the module case 8 with the exhaust pipe 171 inserted through the exhaust pipe opening 180 a. The air distribution member 180 is arranged such that the pair of side wall portions 180B are positioned 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. . Thereby, 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 An 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 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, air outlets 8f that are a plurality of through holes are provided (see FIG. 5). The power generation air supplied from the power generation air introduction pipe 74 to the introduction opening 180 b is introduced into the air distribution chamber 182 surrounded by the top plate 8 a 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. In other words, 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 power generation air is injected into the power generation chamber 10 from the blowout port 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 on the top plate 8a of the module case 8 so as to extend in the horizontal direction. Further, a portion 7a of the heat insulating material 7 is disposed between the evaporator 140 and the module case 8 so as to fill these gaps (see FIGS. 2 and 3).

  Specifically, the evaporator 140 includes a fuel supply pipe 63 that supplies water and raw fuel gas (which 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 side end side in the longitudinal direction. The exhaust pipe 171 extends downward through the opening 167 formed in the top plate 160 a of the air passage cover 160 and the exhaust pipe opening 180 a of the air distribution member 180, and is formed on the top plate 8 a of the module case 8. The exhaust port 111 is connected. 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 a substantially central portion of the top plate 8 a having a substantially rectangular shape when viewed from above. Has been.

  In addition, as shown in FIGS. 2 and 3, the evaporator 140 has an evaporator case 141 that is substantially rectangular in top view. The evaporator case 141 is formed by joining two low-profile bottomed rectangular cylindrical upper case 142 and lower case 143 with an intermediate plate 144 sandwiched therebetween.

  Accordingly, 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 a fuel supply is supplied in 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 evaporator 140B and the mixer 140C are formed in a space where the evaporator 140 is partitioned by a partition plate provided with a plurality of communication holes (slits). The evaporation unit 140B is filled with alumina balls (not shown).

  Similarly, the exhaust passage portion 140A is 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. The second space is filled with a combustion catalyst (not shown). That is, the evaporator 140 of the present embodiment includes a combustion catalyst device.

  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 water in the evaporation section 140B is evaporated by the heat of the exhaust gas, so that water vapor is generated. Will be generated. Further, heat exchange is performed between the mixed gas in the mixing section 140C and the exhaust gas passing through the exhaust passage section 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 a mixed gas to the reformer 120 is connected to the mixing unit 140C. The mixed gas supply pipe 112 is disposed so as to pass through the inside of the exhaust pipe 171, one end is connected to an opening 144 a formed in the intermediate plate 144, and the other end is formed on the top surface of the reformer 120. 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 into the module case 8, where it is bent approximately 90 ° and extends horizontally along the top plate 8a. , Bent downward by approximately 90 ° and connected to the reformer 120.

  Next, the reformer 120 is disposed above the combustion chamber 18 so as to extend in the horizontal direction along the longitudinal direction of the module case 8, and the exhaust gas induction member 130 is interposed between the reformer 120 and the top plate 8 a of the module case 8. And fixed to the top plate 8a with a predetermined distance. The reformer 120 has a substantially rectangular outer shape in a top view, but is an annular structure in which a through hole 120b is formed in the center, and has a casing in which an upper case 121 and a lower case 122 are joined. ing. The through hole 120b is positioned 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 in the longitudinal direction of the reformer 120 (closed side plate 8e side of the module case 8), 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 ( On the closed side plate 8 d side), the fuel gas supply pipe 64 is connected to the lower case 122, and the hydrogen desulfurizer hydrogen extraction pipe 65 extending to the desulfurizer 36 is connected to the upper case 121. Therefore, the reformer 120 receives the mixed gas (that is, raw fuel gas mixed with water vapor (may include reforming air)) from the mixed gas supply pipe 112, reforms the mixed gas therein, The reformed gas (that is, fuel gas) is discharged from the fuel gas supply pipe 64 and the hydrogen extraction pipe 65 for hydrodesulfurizer.

  The reformer 120 is divided into three spaces by the two partition plates 123a and 123b, so that the reformer 120 receives a mixed gas from the mixed gas supply pipe 112 in the reformer 120. And a reforming section 120B filled with a reforming catalyst (not shown) for reforming the mixed gas, and a gas discharge section 120C for discharging the gas that has passed through the reforming section 120B are formed. (See FIG. 2). The reforming unit 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 are movable through a plurality of communication holes (slits) provided in the partition plates 123a and 123b. As the reforming catalyst, a catalyst obtained by imparting nickel to the alumina sphere surface or a catalyst obtained by imparting ruthenium to the alumina sphere surface is appropriately used.

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

In the reforming unit 120B, the mixed gas moving at a low speed is reformed into a fuel gas by the reforming catalyst, and the fuel gas passes through the partition plate 123b and is supplied to the gas discharge unit 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 hydrodesulfurizer.

  A fuel gas supply pipe 64 as a fuel gas supply passage extends downward in the module case 8 along the closed side plate 8d, is bent approximately 90 ° in the vicinity of the bottom plate 8c, and extends in the horizontal direction. It extends into the manifold 66 formed below the inner side, and further extends horizontally in the manifold 66 to the vicinity of the closed side plate 8e on the opposite side. A plurality of fuel supply holes 64 b are formed in the lower surface of the horizontal portion 64 a of the fuel gas supply pipe 64, and fuel gas is supplied into the manifold 66 from the fuel supply holes 64 b. 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. The 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 disposed between the reformer 120 and the top plate 8 a so as to extend in the horizontal direction along the longitudinal direction of the module case 8. The exhaust gas guide member 130 includes a lower guide plate 131 and an upper guide plate 132 that are spaced apart by a predetermined distance in the vertical direction, and connecting plates 133 and 134 to which both ends of these longitudinal directions are attached (FIG. 2, FIG. 2). (See FIG. 3). The upper guide plate 132 is bent at both ends in the width direction downward and is connected to the lower guide plate 131. The connection plates 133 and 134 have upper ends connected to the top plate 8a and lower ends connected to the reformer 120, thereby fixing the exhaust gas guiding member 130 and the reformer 120 to the top plate 8a. Yes.

  The lower guide plate 131 is formed with a convex step portion 131a in which the central portion in the width direction (left-right direction in FIG. 3) protrudes downward. On the other hand, as with the lower guide plate 131, the upper guide plate 132 is formed with a recess 132a so that the central portion in the width direction becomes 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 and then bends downward in the vicinity of the closed side plate 8e, 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, a gas reservoir (gas heat insulating layer) 135 that is an internal space that functions as a heat insulating layer is formed by the upper guide plate 132, the lower guide plate 131, and the connecting plates 133 and 134. The 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 connecting plates 133 and 134 are connected so as to form a predetermined gap, and are not airtightly connected. The gas reservoir 135 can allow exhaust gas to flow from the combustion chamber 18 during operation, or air from the outside during stoppage. However, movement of gas between the inside and outside of the gas reservoir 135 is generally performed. It is moderate.

  The upper guide plate 132 is disposed at a predetermined vertical distance from the top plate 8a. Between the upper surface of the upper guide plate 132 and the top plate 8a, the upper guide plate 132 is horizontally aligned along the longitudinal direction and the width direction. An extended 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 disposed 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 extended second exhaust passage 172b is formed. The second exhaust passage 172b communicates with the first exhaust passage 172a at the top.

  In 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 promotion members to be promoted (see FIG. 3). FIG. 7A is a perspective view showing plate fins provided inside the air passage, and FIG. 7B is a perspective view showing plate fins provided inside the exhaust passage. FIG. 8 is an enlarged perspective view showing the second surface 162b of the plate fin 162 provided in the air passage. The plate fins 162 provided in the air passages 161 a and 161 b include a first surface 162 a extending vertically between the side plate 8 b of the module case 8 and the side plate 160 b of the air passage cover 160, and the top plate 8 a of the module case 8. And a second surface 162b extending horizontally between the top plate 160a of the air passage cover 160. The first surface 162a and the second surface 162b are continuous and configured as an integral member. Four gas intake holes 162c extending along the corners are formed at intervals between the first surface 162a and the second surface 162b. Also, 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. Protruding portions 162d1 and 162e1 as welding margins that are coupled to the module case 8 by spot welding are provided in regions 162d and 162e that face each other with the module case 8 interposed therebetween. The protrusions 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 with the first surface 162a along the side plate 8b of the module case 8 and the second surface 162b along the top plate 8a of the module case 8. It is attached.

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

  Each of the first protrusions 204 includes a pair of inclined portions 204a that extend obliquely downward in the drawing and a connecting portion 204b that connects between the lower ends of the pair of inclined portions 204a. And the 1st passage hole 204c is formed in the position which hits the upper part of the 1st protrusion part 204 of the main-body part 200. As shown in FIG. Since the first protrusion 204 is formed below the first passage hole 204c, the flow of air through the first passage hole 204c from the space below the second surface 162b to the space above is as follows. The air flow through the first passage hole 204c is caused from the space above the second surface 162b to the space below the second surface 162b.

  Each of the second projecting portions 202 includes a pair of inclined portions 202a extending obliquely upward in the drawing and a connecting portion 202b connecting between the upper ends of the pair of inclined portions 202a. A second passage hole 202 c is formed at a position corresponding to the lower side of the second protrusion 202 of the main body 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 prevented. The air flow through the second passage hole 202c is caused from the space below the second surface 162b to the space above.

  In addition, although the structure of the 2nd surface 162b of the plate fin 162 was demonstrated with reference to FIG. 8, it provided in the 1st surface 162a of the plate fin 162, and 1st and 2nd exhaust passage 172a, 172b. The first surface 175 a and the second surface 175 b of the plate fin 175 have the same configuration as the second surface 162 b of the plate fin 162.

  The plate fins 175 provided in the first and second exhaust passages 172a and 172b include 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 the top plate 8a of the module case 8. And a second surface 175b extending horizontally in the horizontal direction. The first surface 175a and the second surface 175b are continuous and configured as an integral member. Four first gas intake holes 175c extending along the corners are formed at the corners of the first surface 175a and the second surface 175b at intervals in the width direction. In addition, two second gas intake holes 175d extending in the width direction at predetermined height positions are formed in the first surface 175a of the plate fin 175 at an interval. The height position of the second gas intake hole 175 d is determined so as to be positioned at a height corresponding to the exhaust concentration portion 176 when the plate fin 175 is attached in the module case 8. In addition, on the second surface 175b of the plate fin 175, four third gas intake 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 disposed along the side plate 8b of the module case 8 and the second surface 175b disposed along the top plate 8a of the module case 8. It is attached.

  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 air And efficient heat exchange is performed between the exhaust gas flowing through the second exhaust passages 172a and 172b, and the temperature of the power generation air is increased by the heat of the exhaust gas.

  The plate fins 162 and 175 can be attached to the module case 8 as follows. FIG. 9 is a perspective view showing a state in which the plate fin is bent, and FIG. 10 is a schematic view showing a state in which the plate fin is attached to the module case by sputtering 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 before assembly of the solid oxide fuel cell device 1. Then, as shown in FIG. 9, flat plate fins 162 and 175 are bent along the air intake holes 162c and 175c at the time of assembly. At this time, since the air intake holes 162c and 175c are formed, the air intake holes 162c and 175c can be easily bent by human power.

  Next, the plate fins 175 disposed in the first and second exhaust passages 172a and 172b are disposed such that the first and second surfaces 175a and 175b are along the side plate 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 attached in the module case 8.

Next, the plate fins 162 arranged in the air passages 161 a and 161 b are arranged so that the first and second surfaces 175 a and 175 b are along the side plate 8 b and the top plate 8 a 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 protrusion 162d1 as a welding margin of the plate fin 162 is provided, the side plate of the module case 8 is formed. An 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 protrusion 162e1 as a welding margin of the plate fin 162. Sputter welding is performed. Thus, 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 intake hole 175d and the third gas intake are formed in the first and second surfaces 175a and 175b of the plate fins 175 disposed in the first and second exhaust passages 172a and 172b. A hole 175e is provided, and through the second gas intake hole 175d and the third gas intake hole 175e, the protrusions 162d1 and 162e1 as welding margins of the plate fin 162 are spot welded to the module case 8, but the present invention is based on this. 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. A margin may be provided, and the plate fins 175 may be spot welded to the module case 8 using the gas intake holes of the plate fins 162.

  The reformer 120 is disposed at a predetermined horizontal distance from the side plate 8b of the module case 8, and the exhaust gas passes between the reformer 120 and the side plate 8b from below to above. Three exhaust passages 173 are formed.

  Further, the lower guide plate 131 is disposed at a predetermined vertical distance from the top surface of the upper case 121 of the reformer 120, and between the lower guide plate 131 and the upper case 121 and the reformer. The 120 through-hole 120b forms a fourth exhaust passage 174 through which the exhaust gas that has passed through the through-hole 120b from the bottom to the top 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 to form an exhaust concentration portion 176 where exhaust gas concentrates.

  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 that are caps respectively connected to both ends of the fuel cell 84.

  The fuel cell 84 is a tubular structure extending in the vertical direction, and includes a cylindrical inner electrode layer 90 that forms a fuel gas flow path 88 therein, a cylindrical outer electrode layer 92, an inner electrode layer 90, and an outer side. An electrolyte layer 94 is provided between the electrode layer 92 and the electrode layer 92. The inner electrode layer 90 is a fuel electrode through which fuel gas passes and becomes a (−) electrode, while the outer electrode layer 92 is an air electrode in contact with air and becomes a (+) electrode.

  Since the inner electrode terminal 86 attached to the upper end side and the lower end side of the fuel cell 84 has the same structure, the inner electrode terminal 86 attached to the upper end side will be specifically described here. The upper portion 90 a of the inner electrode layer 90 includes an outer peripheral surface 90 b and an upper end surface 90 c 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 through a conductive sealing material 96, and is further in direct contact with the upper end surface 90c of the inner electrode layer 90, thereby Electrically connected. At the center of the inner electrode terminal 86, a fuel gas channel capillary 98 that communicates with the fuel gas channel 88 of the inner electrode layer 90 is formed.

  The fuel gas passage narrow 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 the fuel gas flowing from the manifold 66 (see FIG. 2) into the fuel gas passage 88 through the fuel gas passage narrow tube 98 of the lower inner electrode terminal 86. To do. Accordingly, the fuel gas flow passage narrow tube 98 of the lower inner electrode terminal 86 acts as an inflow side flow passage resistance portion, and the flow passage 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 to the combustion chamber 18 (see FIG. 2) through the fuel gas flow path 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 acts as an outflow side flow passage resistance portion, and the flow passage resistance is set to 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, and Ni and ceria doped with at least one selected from rare earth elements. The mixture is formed of at least one of Ni and a mixture of lanthanum garade doped with at least one selected from Sr, Mg, Co, Fe, and Cu.

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

  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 doped with at least one selected from the group consisting of silver and silver.

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

  Next, a gas flow in the fuel cell module of the solid oxide fuel cell device according to the embodiment of the present invention will be described with reference to FIGS. FIG. 12 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, and FIG. 13 is similar to FIG. FIG. 14 is a cross-sectional view taken along line IV-IV in FIG. 2 similar to FIG. 4. In the figure, solid line arrows indicate the flow of fuel gas, broken line arrows indicate the flow of power generation air, and alternate long and short dash arrows indicate the flow of exhaust gas.

  As shown in FIG. 12, water and raw fuel gas (fuel gas) are fed into an evaporation section 140 </ b> B provided in 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. Supplied. The water supplied to the evaporator 140B is heated by the exhaust gas flowing through the exhaust passage 140A provided in the lower layer of the evaporator 140, and becomes water vapor. The water vapor and the raw fuel gas supplied from the fuel supply pipe 63 flow downstream in the evaporation unit 140B and are mixed in the mixing unit 140C. The mixed gas in the mixing section 140C is heated by the exhaust gas flowing through the lower exhaust passage section 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. Is done.

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

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

  Further, as shown in FIGS. 12 and 13, the power generation air is blown downward into the air distribution chamber 182 from the power generation air introduction pipe 74 toward the top plate 8 a of the module case 8. 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 the opening area is larger as it is farther from the air supply port. For this reason, substantially the same amount of power generation air is introduced from each opening 180c into the air passage 161a. The power generation air introduced into the air passage 161a flows along the top plate 8a of the module case 8 toward the upper edges 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 holes 162c are provided at the corners of the plate fins 162, the power generation air that has reached the edge of the air passage 161a circulates inside and outside the plate fins 162 through the gas intake holes 162c. Thereby, the power generation air can be heated uniformly. The power generation air that reaches 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 power generation air passes through the plate fins 162 in the air passages 161a and 161b, the air for generation 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 is performed with the exhaust gas, and it is heated. Thereafter, the power generation air is injected into the power generation chamber 10 from the plurality of air outlets 8 f provided at the lower portion of the side plate 8 b of the module case 8 toward the fuel cell assembly 12.

  Further, as shown in FIG. 13, the fuel gas that has not been 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 is branched into a third exhaust passage 173 and a fourth exhaust passage 174, and between the outer surface of the reformer 120 and the side plate 8 b of the module case 8, and in the reformer 120. The reformer 120 and the exhaust gas guiding member 130 pass through the through hole 120b. At this time, the exhaust gas passing through the fourth exhaust passage 174 is divided in the width direction by the convex step 131a disposed above the through hole 120b of the reformer 120, and does not stay at the lower portion of the exhaust gas guiding member 130. The exhaust gas is guided toward the third exhaust passage 173 and merges with the exhaust gas flowing through the third exhaust passage 173 in the exhaust concentration portion 176. Here, since the second gas intake hole 175d is formed in the first surface 175a of the plate fin 175 at a height corresponding to the exhaust concentration portion 176, the second exhaust passage 172b on the module case 8 side. It is possible to efficiently send exhaust gas to the.

  Thereafter, 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 power generation air passing through the outside. However, since the gas intake holes 175c are provided at the corners of the plate fins 175, the exhaust gas reaching the upper end of the second exhaust passage 172b flows through the gas intake holes 175c inside and outside the plate fins 175. Thereby, the heat | fever of waste gas can be efficiently transmitted to the air for electric power generation. 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 edges 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.

  Thus, 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 Through the plate fin 162 provided in the portion corresponding to the plate fin 175, 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.

  The exhaust gas flowing out from the exhaust port 111 passes through the exhaust pipe 171 provided outside the module case 8, flows into the exhaust passage part 140A of the evaporator 140, passes through the exhaust passage part 140A, and then passes through the evaporator 140 is discharged to the exhaust gas discharge pipe 82. As described above, the exhaust gas exchanges heat with the mixed gas in the mixing section 140C of the evaporator 140 and the water in the evaporation section 140B when flowing through the exhaust passage section 140A of the evaporator 140.

  According to the above embodiment, the plate fins 162 and 175 have the same first surfaces 162a and 175a along the side plate 8b of the module case 8 and second surfaces 162b and 175b along the top plate 8a of the module case 8. Since it is formed as a member, it prevents the gas flow from being disturbed due to poor 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 corner portion between the side plate 8b and the top plate 8a, the weld joint for attaching the plate fins 162 and 175 to the module case 8 is temporarily disconnected. However, 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. In addition, 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 mounting work of the plate fins 162 and 175 is easy. become.

  When the first surfaces 162a and 175a along the side plate 8b of the module case 8 and the second surfaces 162b and 175b along the top plate 8a of the module case 8 are formed as one member, heat is applied to the plate fins 162 and 175. Exhaust gas or air in the space on the opposite side to the module case 8 to be exchanged is difficult to exchange heat. 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 gases 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 and the second and third 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 spot welding is performed in a state where two members to be connected are sandwiched between a pair of electrodes, so the plate fins 162 of the air passages 161a and 161b, the module case 8, 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-described embodiment, since the two members overlap each other at the locations 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 spot welding space, and spot welding can be performed at a desired location.

  Further, according to the present embodiment, the through hole 120b through which the 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. Thereby, exhaust gas can be efficiently induced 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. Thereby, 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 in which 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. Thereby, the pressure loss in the corner | angular part between a side surface and a top | upper surface can be relieve | moderated further, and heat exchange performance can be improved. Further, when the plate fins 162 and 175 are formed by bending a single plate-like member, the bending operation can be easily performed. Since the bending work can be easily performed in this manner, the plate fins 162 and 175 can be stacked and stored without being bent until the mounting.

DESCRIPTION OF SYMBOLS 1 Solid oxide fuel cell apparatus 2 Fuel cell module 4 Auxiliary machine unit 6 Housing 7 Heat insulating 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 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 Desulfurizer 38 Fuel flow rate adjustment unit 39 Valve 40 Air supply source 42 Solenoid valve 44 Reforming air Flow rate adjusting unit 45 Power generation air flow rate adjusting unit 50 Hot water production device 52 Control box 54 Inverter 63 Fuel supply pipe 64 Fuel gas supply pipe 64a Horizontal portion 64b Fuel supply hole 65 Hydrogen extraction pipe 66 for hydrodesulfurizer Manifold 68 Lower support plate 74 Air introduction pipe 82 for power generation Exhaust gas discharge pipe 83 Ignition device 84 Battery cell 86 Inner electrode terminal 88 Fuel gas channel 90 Inner electrode layer 90a Upper part 90b Outer peripheral surface 90c Upper end surface 92 Outer electrode layer 94 Electrolyte layer 96 Sealing material 98 Fuel gas channel narrow tube 111 Exhaust port 112 Mixed gas supply tube 120 Gasifier 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 guide member 131 Lower guide plate 131a Convex step part 132 Upper guide plate 132a Recess 133 Connecting plate 135 Gas reservoir 140 Evaporator 140A Exhaust passage 140B Evaporator 140C Mixer 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 Open Portion 161a Air passage 161b Air passage 162 Plate fin 162a First surface 162b Second surface 162c Gas intake hole 167 Opening portion 171 Exhaust pipe 172a First exhaust passage 172b Second exhaust passage 175 Plate fin 175a First surface 175b First Second surface 175c First gas intake hole 175d Second gas intake hole 175e Third gas intake hole 176 Exhaust concentration portion 180 Air distribution member 180A Top plate 180B Side wall portion 180C Base portion 180a Exhaust pipe opening 180b Inlet opening 180c Opening 182 Air distribution chamber 200 Main body portion 202 Protruding portion 202a Inclined portion 202b Connecting portion 202c Passing hole 204 Protruding portion 204a Inclining portion 204b Connecting portion 204c Passing hole 210 Electrode 300 Air passage 302 Exhaust passage 304 Module container 304A Side wall 304 B Top surface 306 Heat exchange promoting member 310 Case

Claims (6)

A solid oxide fuel cell device that generates power by a reaction between a fuel gas obtained by reforming a raw fuel gas and air for power generation,
A plurality of fuel cells that are electrically connected to each other and that generate power by a reaction between the fuel gas and the power generation air;
A module container for housing the plurality of fuel cells;
A reformer disposed in the module container and generating the fuel gas from the raw fuel gas by steam reforming;
A combustion section that burns fuel gas that did not contribute to power generation of the plurality of fuel cells in the upper portion of the fuel cell and heats the reformer with the generated exhaust gas;
An air passage that is provided along an outer surface of the module container and supplies the power generation air to the plurality of fuel cells;
Provided along the inner surface of the module container, the exhaust gas flows to the exhaust port of the module container for exhaust gas, and heat exchange is performed between the air in the air passage and the exhaust gas flowing through the module container. And an exhaust passage through which
The air passage and the exhaust passage are formed along upper portions of the top surface and the side wall surface of the module container,
Each of the air passage and the exhaust passage is provided with a heat exchange promoting member,
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 a gas intake hole for exhaust gas or air to pass 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 in a gas intake hole formed in a heat exchange promotion member provided in the other of the air passage or the exhaust passage of a heat exchange promotion member provided in one of the air passage or the exhaust passage. In the opposite position, a welding margin for spot welding is provided,
The solid oxide fuel cell device according to claim 2. A flow 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 joins 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 region,
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 a gas intake hole in 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 a boundary between the first surface and the second surface. Fuel cell device.

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