JP2016225120A - Solid oxide type fuel cell device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid oxide type fuel cell device that performs heat exchange between an outside air passage arranged along a side wall of a module case and an inside exhaust passage in which thermal effect to the fuel cell is suppressed and heat exchange performance for oxidant gas is sufficiently secured while reducing size and cost of the device.SOLUTION: In a solid oxide type fuel cell device 1, a plate fin 162 facilitating heat exchange between air and exhaust gas is installed in air passages 161a, 161b, and a bottom edge of the plate fin 162 is extended to a height approximately equal to that of a portion at a side plate 8b of a module case 8 where radiation heat from a combustion chamber 18 can be received.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a solid oxide fuel cell device, and more particularly to a solid oxide fuel cell device that generates electric power by a reaction between a fuel gas obtained by reforming a raw material gas and air.

  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.

  Conventionally, in a solid oxide fuel cell device, the temperature of an oxidizing gas (air) is raised by using the heat of exhaust gas generated by burning off-gas that has not been used for power generation. Supplying to a fuel cell is performed. As a configuration for performing heat exchange between the exhaust gas and the oxidizing gas, for example, Patent Document 1 discloses an exhaust passage for exhausting exhaust gas from the storage chamber outside the storage chamber that stores the cell stack. An apparatus is disclosed which is formed and has an air passage formed outside thereof for supplying oxidizing gas into the housing chamber. Moreover, in the apparatus of patent document 1, the vaporizer which produces | generates water vapor | steam in the exhaust passage is provided. According to such a configuration, the water vapor can be generated by the exhaust gas in the exhaust passage, and the exhaust passage and the air passage are provided adjacent to each other. Therefore, the exhaust gas and the air passage that pass through the exhaust passage are provided. Heat exchange is performed with the power generation air passing through.

JP 2012-221659 A

  Here, in the apparatus described in Patent Document 1, the exhaust gas flows from the top to the bottom in the exhaust passage, and the exhaust gas in the exhaust passage is exchanged from above by heat exchange with the air in the air passage. There is an uneven temperature in the vertical direction that causes the temperature to drop downward. In addition, the air flows from the bottom to the top in the air passage, and the heat in the exhaust passage causes heat to exchange with the exhaust gas in the vertical direction so that the temperature of the air in the air passage also decreases from above to below. Temperature unevenness has occurred.

  By the way, in order to manufacture the fuel cell device as described above for general consumers (home use), it is necessary to reduce the size while ensuring the performance. In the case of downsizing the module case, the distance between the fuel cell unit and the side plate of the module case must be reduced. However, if the distance between the fuel cell unit and the side plate of the module case is reduced in this way, the fuel cell unit is likely to be affected by temperature variations in the exhaust gas flowing in the exhaust passage and the air flowing in the air passage. Specifically, as described above, in the fuel cell device described in Patent Document 1, since the temperature unevenness in the vertical direction occurs in the exhaust gas flowing in the exhaust passage and the air flowing in the air passage, the fuel cell unit There is a risk that temperature unevenness will occur in the vertical direction of the unit. Furthermore, the fuel cell unit disposed near the side plate in plan view is more susceptible to temperature variations in the exhaust gas and air than the fuel cell unit disposed near the center in plan view, and is disposed near the side plate in plan view. The temperature unevenness in the lateral direction also occurs between the fuel cell unit thus formed and the fuel cell unit disposed near the center in plan view. Such non-uniform temperature distribution becomes a factor that degrades the fuel cell unit.

  Further, in the configuration described in Patent Document 1 above, since the carburetor is provided in the exhaust passage, before the heat exchange with the air in the air passage is performed, the exhaust heat of the exhaust gas is reduced to the amount of water vapor. Since it is used for vaporization, the temperature of the exhaust gas decreases. For this reason, the heat exchange performance between exhaust gas and air falls.

  The present invention reduces the size and cost of a solid oxide fuel cell device that exchanges heat between an outer air passage provided along the side wall of a module case and an inner exhaust passage. However, it aims at suppressing the heat influence to a fuel cell, and ensuring sufficient heat exchange performance with respect to oxidant gas.

  The solid oxide fuel cell device of the present invention is a solid oxide fuel cell device that generates electric power by the reaction of a fuel gas obtained by reforming a raw material gas and air. A fuel cell, a module case including a top plate and a side plate, housing a plurality of fuel cells, a heat insulating material provided to cover the module case, and disposed above the fuel cell in the module case, A reformer for reforming a raw material gas using water vapor to generate a fuel gas, a fuel gas supply passage for supplying the fuel gas to a plurality of fuel cells, and above the plurality of fuel cells in a module case, In addition, below the reformer, a fuel gas that has not contributed to the power generation of the plurality of fuel cells is burned, and the reformer is heated by the generated exhaust gas, in the heat insulating material, and in the module. Is formed between the evaporator, which supplies steam to the reformer, and at least the top and side plates of the module case and the heat insulating material. The air supplied onto the top plate of the module case is guided from the upper side to the lower side of the module case along the outer surface of the side plate of the module case, and the air is supplied to the plurality of fuel cells from the lower part of the module case. The air supply passage and the top and side plates of the module case are sandwiched inside the module case, extend along the air supply passage, guide the exhaust gas generated in the combustion section to the exhaust port, and the air supply passage An exhaust passage for exchanging heat between the air in the interior and the exhaust gas, and promoting heat exchange between the air and the exhaust gas in the air supply passage. Heat exchange promoting member is provided, the lower end of the heat exchange promoting member is extended to approximately the same height as the portion that can be exposed to radiant heat from the combustion portion of the side plate of the module case, wherein the.

  In order to prevent deterioration of the fuel cell unit due to temperature unevenness of the air flowing through the air passage and the exhaust gas flowing through the exhaust passage, it is conceivable to perform heat exchange above the fuel cell. However, when the fuel cell device is downsized, it is difficult to ensure a sufficient heat exchange distance above the fuel cell.

  On the other hand, according to this invention comprised as mentioned above, the evaporator is arrange | positioned in the heat insulating material and the outside of the module case. As a result, the temperature of the exhaust gas in the exhaust passage is prevented from lowering by the evaporator, and sufficient heat exchange can be performed between the exhaust gas and air even at a short heat exchange distance.

  Further, according to the present invention, the lower end of the heat exchange promoting member extends to a height substantially equal to a portion that can receive radiant heat from the combustion portion of the side plate of the module case. Thereby, the radiant heat from a combustion part is transmitted to the heat exchange promotion member via the side plate of a module case. For this reason, the air is sufficiently heated in a portion above the fuel battery cell in the air passage, and it is possible to prevent temperature unevenness from occurring at a height corresponding to the fuel battery cell in the air passage.

  Furthermore, the lower end of the heat exchange promoting member extends to a height substantially equal to a portion that can receive radiant heat from the combustion portion of the side plate of the module case. As a result, heat exchange from the exhaust gas to the air is promoted at the side of the combustion part of the module case, so that the exhaust heat from the combustion part is prevented from staying above the fuel cell, and the temperature is more reliably determined. Generation of unevenness can be suppressed.

  In this way, according to the present invention, it is possible to improve the heat exchange performance between the exhaust gas and the power generation air above the fuel cell, and the fuel cell is affected by temperature unevenness. Therefore, the fuel cell device can be downsized.

In the present invention, preferably, the heat exchange promoting member is continuously provided from the vicinity of the air supply port provided above the module case to a position where it can receive radiant heat from the combustion section.
According to the present invention configured as described above, the radiant heat transmitted from the combustion section to the side plate of the module case is transmitted to the heat exchange promoting member, and further, this heat is transmitted to the vicinity of the air supply port by the heat exchange promoting member. Therefore, the air can be sufficiently heated even with a short heat exchange distance.

  In the present invention, preferably, the upper end portion of the fuel cell is provided with a heat storage means for storing heat, and the lower end of the heat exchange promoting member is positioned at a height substantially equal to the heat storage means.

  According to the present invention configured as described above, since the heat storage means receives heat from the combustion part, the combustion battery part is prevented from being directly heated by the combustion part, and the temperature unevenness in the vertical direction occurs in the fuel battery cell. Can be suppressed. Furthermore, since the heat storage means that stores heat functions as a heat source and heats the side plate of the module case, the air is sufficiently heated at a location above the fuel cell in the air passage, and the fuel cell in the air passage It is possible to prevent temperature unevenness at the height corresponding to the cell.

  According to the solid oxide fuel cell device of the present invention, the solid oxide fuel cell device performs heat exchange between the outer air passage provided along the side wall of the module case and the inner exhaust passage. However, while reducing the size and cost of the apparatus, it is possible to suppress the thermal influence on the fuel cell and to ensure sufficient heat exchange performance for the oxidant gas.

1 is an overall configuration diagram showing a solid oxide fuel cell device according to an embodiment of the present invention. It is front 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. It is a perspective view of the state which removed the heat insulating material and the housing from the fuel cell module of the solid oxide fuel cell apparatus by one Embodiment of this invention. It is a fragmentary sectional view showing a fuel cell unit of a solid oxide fuel cell by one embodiment of the present invention. It is side surface sectional drawing which shows a fuel cell module for demonstrating the flow of the gas in the fuel cell module of the solid oxide fuel cell apparatus by one Embodiment of this invention. FIG. 3 is a front cross-sectional view of the fuel cell module taken along line III-III in FIG. 2 for explaining a gas flow in the fuel cell module of the solid oxide fuel cell device according to the embodiment of the present invention. 1 is a partial cross-sectional view of an upper portion of a fuel cell module of a solid oxide fuel cell device according to an embodiment of the present invention.

  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. 5) 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 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 the water supply source 24, and the tap water is heated by the heat of the exhaust gas and 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 an exploded perspective view of the module case and the air passage 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. 4, 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-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 allowing the exhaust pipe 171 to pass therethrough is 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).

  At the lower part of the side plate 8b of the module case 8, a plurality of through holes 8f are provided (see FIG. 4). An air supply port 160c (see FIG. 2) communicating with the air passage 161a is formed in the power generation air at a substantially central portion of the top plate 160a of the air passage cover 160 on the closed side plate 8e side of the module case 8. Yes. The power generation air introduction pipe 74 is connected to the air supply port 160 c, and the air introduced from the power generation air introduction pipe 74 passes through the flow path direction adjustment unit 164 and is an air passage on the top plate 8 a of the module case 8. 161a (see FIGS. 2 and 4). Then, the power generation air is injected into the power generation chamber 10 through the air passages 161a and 161b from the outlet 8f toward the fuel cell assembly 12 (see FIGS. 3 and 4).

  In addition, plate fins 162 as heat exchange promoting members are provided inside the air passages 161a and 161b (see FIG. 3). The plate fins 162 include a horizontal portion 162 a provided in the horizontal direction so as to extend in the longitudinal direction and the width direction between the top plate 8 a of the module case 8 and the top plate 160 a of the air passage cover 160, and the side plate 8 b of the module case 8. And a vertical portion 162b provided between the side plate 160b of the air passage cover 160 and at a position above the fuel cell unit 16 so as to extend in the longitudinal direction and the vertical direction. The horizontal portion 162 a has an end on the center side in the short direction extending to the vicinity of the air supply port 160 c formed in the top plate 160 a of the air passage cover 160.

  Further, the lower end of the vertical portion 162b extends to a height that is substantially equal to a portion that can receive radiant heat from the combustion chamber 18 of the side plate 8b of the module case 8. Specifically, the lower end of the vertical portion 162b is located near the upper end of the fuel cell unit 16 that functions as a heat storage unit to be described later, more specifically, at the height of the inner electrode terminal 86.

  The plate fin 162 is formed by bending one plate fin in the vicinity of the edge of the top plate 8a, and the horizontal portion 162a and the vertical portion 162b are configured as one continuous member. In the present embodiment, the horizontal portion 162a and the vertical portion 162b are configured by bending a top plate 8a with a single plate fin, but it is not always necessary to configure in this manner. For example, the horizontal portion 162a and the vertical portion 162b may be configured by connecting two plate fins by welding or the like, and the horizontal portion 162a and the vertical portion 162b are continuous as one member capable of transferring heat. It only has to be configured.

  The power generation air flowing through the air passages 161a and 161b is provided in the module case 8 inside the plate fins 162 (specifically, along the top plate 8a and the side plates 8b), particularly when passing through the plate fins 162. Heat is exchanged with the exhaust gas that passes through the exhaust passage) and is heated. For this reason, the portions where the plate fins 162 are provided in the air passages 161a and 161b function as a heat exchanger (heat exchange unit). The portion of the plate fin 162 provided with the horizontal portion 162a constitutes the main heat exchanger portion, and the portion of the plate fin 162 provided with the vertical portion 162b constitutes the subordinate heat exchanger portion.

  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). The exhaust gas exhaust pipe 82 (see FIG. 3) for exhaust gas exhaust is connected, and the upper end of the exhaust pipe 171 is connected to the other side end in the longitudinal direction. The exhaust pipe 171 extends downward through an opening 167 formed in the top plate 160 a of the air passage cover 160, and is connected to an exhaust port 111 formed on the top plate 8 a of the module case 8. The exhaust port 111 is an opening through which the exhaust gas generated in the combustion chamber 18 in the module case 8 is discharged to the outside of the module case 8, and is substantially at the center of the top plate 8 a that is substantially rectangular in top view. Is formed.

  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 layer is formed in the upper layer portion. An evaporation unit 140B that evaporates water supplied from the supply pipe 63 to generate water vapor, and a mixing unit 140C that mixes the water vapor generated in the evaporation unit 140B and the raw fuel gas supplied from the fuel supply pipe 63 are provided. It has been.

  As shown in FIGS. 2 and 3, the evaporator 140B and the mixer 140C are formed in a space in which the evaporator 140 is partitioned by a partition plate 145 having a plurality of communication holes (slits) 145a. 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 146 and 147 having a plurality of communication holes. The second space is filled with a combustion catalyst (not shown). That is, the evaporator 140 of this embodiment includes a combustion catalyst in the lower layer structure of the two-layer structure in the vertical direction.

  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, Water vapor 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 horizontally along the longitudinal direction of the module case 8, and the exhaust gas guiding member 130 is disposed between the top plate 8 a of the module case 8. And fixed to the top plate 8a with a predetermined distance therebetween. 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 guiding member 130 includes a lower guiding plate 131 and an upper guiding plate 132 that are separated by a predetermined distance in the vertical direction, and connecting plates 133 and 134 to which both ends of the longitudinal direction are attached (FIG. 2). 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 connecting 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. ing.

  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) projects 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 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 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. While it is possible for exhaust gas to flow into the gas reservoir 135 from the combustion chamber 18 during operation, or to allow air to flow in from the outside when stopped, the movement of gas between the inside and outside of the gas reservoir 135 is generally performed. Is moderate.

  The upper guide plate 132 is disposed at a predetermined vertical distance from the top plate 8a, and the exhaust extending in the horizontal direction along the longitudinal direction and the width direction is provided between the upper guide plate 132 and the top plate 8a. A passage 172 is formed. The exhaust passage 172 is arranged in parallel with the air passage 161a with the top plate 8a of the module case 8 interposed therebetween. In the exhaust passage 172, plate fins 175 similar to the plate fins 162 in the air passages 161a and 161b are provided. Has been placed. The plate fins 175 are provided at substantially the same location as the horizontal portions 162a of the plate fins 162 when viewed from above, and face each other in the vertical direction with the top plate 8a interposed therebetween. Of the air passage 161a and the exhaust passage 172, in the portion where the plate fins 162 and 175 are provided, efficient heat exchange is performed between the power generation air flowing through the air passage 161a and the exhaust gas flowing through the exhaust passage 172. Thus, the temperature of the power generation air is raised by the heat of the exhaust gas.

  The reformer 120 is disposed at a predetermined horizontal distance from the side plate 8b of the module case 8, and the exhaust gas passes between the reformer 120 and the side plate 8b from below to above. An exhaust passage 173 is formed. Further, the exhaust gas guiding member 130 is also disposed at a predetermined horizontal distance from the side plate 8b, and the exhaust passage 173 includes the passage between the exhaust gas guiding member 130 and the side plate 8b and extends to the top plate 8a. ing. The exhaust passage 173 communicates with the exhaust passage 172 through an exhaust gas introduction port 172a located at the corner between the top plate 8a and the side plate 8b. The exhaust gas introduction port 172a extends in the longitudinal direction in the module case 8.

  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 through hole 120b of 120 forms an exhaust passage 174 through which the exhaust gas that has passed through the through hole 120b from the lower side to the upper side is passed. The exhaust passage 174 joins the exhaust passage 173 above the reformer 120.

Next, the fuel cell unit 16 will be described with reference to FIG.
FIG. 5 is a partial cross-sectional view showing a fuel cell unit of a solid oxide fuel cell according to an embodiment of the present invention.
As shown in FIG. 5, 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.

  At least the upper inner electrode terminal 86 is formed of a metal having a large heat capacity and a high heat storage property, and functions as a heat storage means. The heat generated in the combustion chamber 18 above the fuel cell unit 16 is stored in the upper inner electrode terminal 86, thereby preventing the heat from the combustion chamber 18 from being directly transmitted to the fuel cell 84. Further, the inner electrode terminal 86 stored in this way functions as a heat source, and releases the stored heat to the surroundings.

  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, the flow of gas and heat in the fuel cell module of the solid oxide fuel cell device according to one embodiment of the present invention will be described with reference to FIGS.
FIG. 6 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. 7 is similar to FIG. It is sectional drawing along the -III line. FIG. 8 is a partial cross-sectional view of the upper portion of the fuel cell module of the solid oxide fuel cell device according to one embodiment of the present invention.
6 and 7 are diagrams in which arrows indicating gas flow are newly added in FIGS. 2 and 3, respectively, and show the state in which the heat insulating material 7 is removed for convenience of explanation. . 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 dashed arrows indicate the flow of exhaust gas.

  As shown in FIG. 6, water and raw fuel gas (fuel gas) are fed into an evaporator 140 </ b> B provided in the upper layer of the evaporator 140 from a fuel supply pipe 63 connected to one end in the longitudinal direction of the evaporator 140. 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 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 exhaust passage 172 in order, the mixed gas in the mixed gas supply pipe 112 is further heated by the exhaust gas flowing through these passages. The

  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 120 </ b> C into the fuel gas supply pipe 64 and the hydrodesulfurizer hydrogen extraction pipe 65. 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. 6 and 7, the power generation air is supplied from the power generation air introduction pipe 74 to the air passage 161a. When the power generation air passes through the plate fins 162 in the air passages 161 a and 161 b, the air for generating electricity is between the exhaust gas passing through the exhaust passages 172 and 173 formed in the module case 8 below the plate fins 162. In this case, efficient heat exchange is performed and heating is performed. In particular, since the plate fins 175 are provided in the exhaust passage 172 corresponding to the plate fins 162 of the air passage 161a, the power generation air is discharged from the exhaust gas via the plate fins 162 and the plate fins 175. Perform more efficient heat exchange.

  Further, when the off gas is burned in the combustion chamber 18, the portion above the upper end portion of the fuel cell unit 16 of the side plate 8 b of the module case 8 receives radiant heat and is heated. Then, by heating the side plate 8b of the module case 8, this heat is transmitted to the vertical portion 162b of the plate fin 162 in the air passage 161b. Further, the heat transmitted to the vertical portion 162b of the plate fin 162 is propagated to the horizontal portion 162a. For this reason, air is heated efficiently also in the part above the upper end part of the fuel cell unit 16 of the air passage 161b. 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.

  In the present embodiment, since the exhaust passage is not formed in the side portion of the fuel cell assembly 12, heat exchange between the power generation air and the exhaust gas is suppressed in this portion. Therefore, in the side part of the fuel cell assembly 12, the temperature unevenness in the vertical direction is less likely to occur in the power generation air in the air passage 161b.

  Further, as shown in FIG. 7, the fuel gas not used for power generation in the power generation chamber 10 is combusted in the combustion chamber 18 to become exhaust gas (combustion gas), and rises in the module case 8. Specifically, the exhaust gas branches into an exhaust passage 173 and an exhaust passage 174, between the outer surface of the reformer 120 and the side plate 8 b of the module case 8, and through holes 120 b of the reformer 120. From between the reformer 120 and the exhaust gas guiding member 130. At this time, the exhaust gas passing through the exhaust passage 174 is bisected in the width direction by the convex step portion 131a disposed above the through-hole 120b of the reformer 120, and does not stay at the lower portion of the exhaust gas guiding member 130. The gas is guided toward the exhaust passage 173 and is quickly joined to the exhaust gas flowing through the exhaust passage 173.

  Further, as shown in FIG. 9, radiant heat is generated by burning the fuel gas that has not been used for power generation in the power generation chamber 10 in the combustion chamber 18. As indicated by an arrow A, this radiant heat is mainly the upper end portion (inner electrode terminal 86) of the fuel cell unit 16 and the portion above the upper end portion of the fuel cell unit 16 on the side plate 8b of the module case 8. These parts are heated by radiant heat.

  Since the inner electrode terminal 86 of the fuel cell unit 16 on the side plate 8b of the module case 8 is made of a material having a high heat storage property, the heat generated in the combustion chamber 18 is stored. The inner electrode terminal 86 functions as a heat source when storing heat, and heats the vertical portion 162b of the plate fin 162 through the side plate 8b of the module case 8 as indicated by an arrow B. When the vertical portion 162b is heated, the heat is transmitted to a portion near the air supply port 160c of the horizontal portion 162a as indicated by an arrow C, and therefore, the fuel cell unit is connected to the fuel cell from the air supply port 160c of the air passages 161a and 161b. Heat exchange is efficiently performed at a portion above the upper end of the unit 16.

  Thereafter, the exhaust gas flows into the exhaust passage 172 from the exhaust gas inlet 172a. In the exhaust passage 172, the exhaust gas flows in the horizontal direction in the exhaust passage 172 and flows out from the exhaust port 111 formed in the center of the top plate 8 a of the module case 8.

  When the exhaust gas flows upward in the exhaust passage 173, heat exchange is performed between the power generation air and the exhaust gas through the vertical portion 162b of the plate fin 162 provided in the air passage 161b. Is called. Further, when the exhaust gas flows in the horizontal direction through the exhaust passage 172, a plate fin 175 provided in the exhaust passage 172 and a plate fin 162 provided in the air passage 161a corresponding to the plate fin 175. Through the horizontal portion 162a, efficient heat exchange is performed between the power generation air and the exhaust gas. In this way, the temperature of the power generation air is raised 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 evaporates. From the vessel 140 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.

The solid oxide fuel cell device 1 according to the present embodiment has the following effects.
In the present embodiment, the evaporator 140 is disposed inside the heat insulating material 7 and outside the module case 8. As a result, the exhaust gas in the exhaust passages 172 and 173 is prevented from being lowered in temperature by the evaporator 140, and the exhaust gas in the exhaust passages 172 and 173 and the air in the air passage 161 can be reduced even at a short heat exchange distance. Sufficient heat exchange can be performed.

  In the present embodiment, the lower end of the vertical portion 162b of the plate fin 162 extends to a height that is substantially equal to the portion of the side plate 8b of the module case 8 that can receive the radiant heat from the combustion chamber 18. Thereby, the radiant heat from the combustion chamber 18 is transmitted to the vertical part 162b of the plate fin 162 through the side plate 8b of the module case 8. For this reason, air is sufficiently heated at a location above the fuel battery cell 84 in the air passages 161a and 161b, and temperature unevenness occurs at a height corresponding to the fuel battery cell 84 in the air passages 161a and 161b. Can be prevented.

  Further, for example, when the lower end of the vertical portion 162b of the plate fin 162 terminates at a height substantially equal to that of the reformer 120, in the portion of the side plate 8b of the module case 8 that contacts the side of the combustion chamber 18, the exhaust gas is exhausted. The heat exchange efficiency between gas and air decreases. Thus, if the heat exchange efficiency in the part which hits the side of the combustion chamber 18 decreases, the heat generated in the combustion chamber 18 stays above the fuel cell unit 16.

  On the other hand, in the present embodiment, the lower end of the vertical portion 162b of the plate fin 162 extends to a height substantially equal to a portion that can receive the radiant heat from the combustion chamber 18 of the side plate 8b of the module case 8. Thereby, since the exchange from the exhaust gas to the air is promoted on the side of the combustion chamber 18 of the module case 8, the exhaust heat from the combustion chamber 18 is prevented from staying above the fuel cell unit 16, and more The occurrence of temperature unevenness can be surely suppressed.

  Thus, according to the present embodiment, it is possible to improve the heat exchange performance between the exhaust gas and the air above the fuel cell 84, and the fuel cell 84 is affected by temperature unevenness. The fuel cell device 1 can be downsized without any problem.

  Further, in the present embodiment, the plate fin 162 includes the horizontal portion 162a and the vertical portion 162b that are integrally formed, and continuously from the vicinity of the air supply port 160c to a position where the radiant heat from the combustion chamber 18 can be received. Is provided. Thereby, the radiant heat transmitted from the combustion chamber 18 to the side plate 8b of the module case 8 is transmitted to the vertical portion 162b of the plate fin 162, and further, this heat is transmitted to the vicinity of the air supply port 162c by the plate fin 162. The air can be sufficiently heated even with a short heat exchange distance.

  In the present embodiment, the upper end portion of the fuel cell 84 is provided with an inner electrode terminal 86 made of a metal having a large heat capacity and high heat storage property, and the lower end of the vertical portion 162b of the plate fin 162 is the inner electrode terminal. It is located at a height substantially equal to 86. Accordingly, since the inner electrode terminal 86 receives heat from the combustion chamber 18, the fuel cell 84 is prevented from being directly heated by the combustion chamber 18, and the temperature unevenness in the vertical direction is prevented from occurring in the fuel cell 84. it can. Further, since the inner electrode terminal 86 that stores heat functions as a heat source and heats the vertical portion 162b of the plate fin 162 via the side plate 8b of the module case 8, a portion above the fuel cell 84 of the air passage 161b. Thus, the air is sufficiently heated, and it is possible to prevent temperature unevenness from occurring at a height corresponding to the fuel battery cell 84 in the air passage 161b.

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 12 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 46 First heater 48 Second heater 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 for hydrodesulfurizer Pipe 66 Manifold 68 Lower support plate 74 Power generation air introduction pipe 8 Exhaust gas discharge pipe 83 Ignition device 84 Fuel cell 86 Inner electrode terminal 88 Fuel gas channel 90 Inner electrode layer 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 132 Upper guide plate 132a Recess 133 Connection plate 134 Connection plate 135 Gas reservoir 140 Evaporator 140A Exhaust passage portion 140B Evaporation portion 140C Mixing portion 141 Evaporator case 142 Upper case 143 Lower case 144 Intermediate plate 144a Opening 145 Partition plate 146 Partition plate 160 Air passage Bar 160a Top plate 160b Side plate 160c Air supply port 161a Air passage 161b Air passage 162 Plate fin 162a Horizontal portion 162b Vertical portion 163 Plate fin 164 Flow direction adjustment portion 167 Opening portion 171 Exhaust pipe 172 Exhaust passage 173 Exhaust passage 174 Exhaust passage 175 Plate fins

Claims (3)

In the solid oxide fuel cell device that generates power by the reaction between the fuel gas obtained by reforming the raw material gas and air,
A plurality of fuel cells electrically connected to each other;
A module case containing a plurality of fuel cells, including a top plate and a side plate;
A heat insulating material provided to cover the module case;
A reformer disposed above the fuel cell in the module case and reforming a raw material gas using steam to generate the fuel gas;
A fuel gas supply passage for supplying the fuel gas to the plurality of fuel cells;
The fuel gas that has not contributed to the power generation of the plurality of fuel cells is burned above the plurality of fuel cells in the module case and below the reformer, and the reformed gas is generated by the generated exhaust gas. A combustion section for heating the mass device;
An evaporator disposed in the heat insulating material and outside the module case, generating steam by heat exchange with exhaust gas, and supplying the generated steam to the reformer;
Air that is formed between at least the top plate and side plate of the module case and the heat insulating material and is supplied onto the top plate of the module case from above the module case along the outer surface of the side plate of the module case. An air supply passage that guides downward and supplies air to the plurality of fuel cells from a lower portion of the module case;
The module case is sandwiched between the top and side plates of the module case, extends along the air supply passage, leads to an exhaust port for discharging exhaust gas generated in the combustion section, and the air supply passage An exhaust passage for exchanging heat between the air inside and the exhaust gas,
A heat exchange promoting member for promoting heat exchange between the air and the exhaust gas is provided in the air supply passage.
The solid oxide fuel cell device, wherein a lower end of the heat exchange promoting member extends to a height substantially equal to a portion of the side plate of the module case that can receive radiant heat from the combustion portion.   2. The solid according to claim 1, wherein the heat exchange promoting member is continuously provided from a vicinity of an air supply port provided above the module case to a position where it can receive radiant heat from the combustion unit. Oxide fuel cell device.   The heat storage means which stores heat is provided in the upper end part of the fuel battery cell which constitutes the fuel battery cell, and the lower end of the heat exchange promotion member is located at a height substantially equal to the heat storage means. 2. A solid oxide fuel cell device according to 1.

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