JP2017069066A - Solid oxide fuel cell device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit a fuel battery cell from being contaminated without constructing a pipe fitting with a material having heat resistance.SOLUTION: By coupling an inflow-side piping 64A and outflow-side piping 64B by a pipe fitting 64C, a fuel gas supply pipe 64 is constructed which extends through a module case 8 in a vertical direction and supplies fuel gas from a reformer 120 to a fuel gas manifold 66. The pipe fitting 64C is made of a material whose heat resistance is lower than the module case 8 and a fuel gas supply pipe 64. Furthermore, a solid oxide fuel cell device includes a scattering suppression cover 180 which is made of the material having higher heat resistance than the pipe fitting 64C and surrounds the whole periphery of the pipe fitting 64C.SELECTED DRAWING: Figure 2

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.

  In such a solid oxide fuel cell device, for example, as described in Patent Document 1, a combustion unit that burns fuel gas that did not contribute to power generation and power generation air is provided above the fuel cell. A reformer for steam reforming the raw material gas is provided above the combustion section. The fuel gas reformed by the reformer is sent to a manifold provided below the fuel battery cell via a fuel gas supply pipe extending in the vertical direction on the side of the fuel battery cell. Supplied to the battery.

JP 2011-18456 A

  Here, when assembling the solid oxide fuel cell device described in Patent Document 1, when inserting the fuel cell into the module container, the fuel cell, the reformer, and the manifold are combined. The connecting fuel gas supply pipe interferes. For this reason, the fuel gas supply pipe is divided into upper and lower parts, and after the fuel cells are arranged in the module container, the fuel gas supply pipe divided by the pipe joint is connected (for example, patent) (Refer to the pipe joints of the pipes 6A and 6B in the drawing of Document 1). Here, since the heat capacity of the pipe joint is different from that of the fuel gas supply pipe, temperature unevenness is likely to occur between the pipe joint and the fuel gas supply pipe. When such temperature unevenness is transmitted to the fuel cell, the fuel cell is deteriorated. For this reason, it is desirable to arrange the pipe joint in a combustion part spaced apart from the fuel cell in the vertical direction.

  However, a normal pipe joint is not assumed to be used in a high temperature environment, and has a lower heat resistance than a fuel gas supply pipe or the like. For this reason, if a pipe joint receives the heat of a combustion part, a pipe joint will deteriorate and the surface will peel in powdery form. When such exfoliated powder adheres to the fuel cell, the fuel cell is contaminated. Further, when a pipe joint having high heat resistance is used, the cost becomes high.

  This invention is made | formed in view of said subject, and it aims at suppressing the contamination of a fuel cell, without comprising a pipe joint with the material which has heat resistance.

  The present invention relates to a solid oxide fuel cell device, which includes a plurality of fuel cells that generate power by a reaction between power generation air and fuel gas obtained by steam reforming, and a plurality of fuel cells. A module container, a combustion unit that is provided above the plurality of fuel cells in the module container and that generates exhaust gas by burning fuel gas that has not contributed to power generation of the plurality of fuel cells, and above the combustion unit A reformer configured to steam reform the raw material gas to generate a fuel gas, a power generation air supply means for supplying power generation air to the fuel cells, and a plurality of fuel cells A fuel gas manifold for supplying fuel gas to the internal flow paths of the plurality of fuel cells, an inflow side pipe for supplying fuel gas to the fuel gas manifold, an outflow side pipe for supplying fuel gas from the reformer, Inflow side distribution And a pipe joint for connecting the outflow side pipe, and the inflow side pipe and the outflow side pipe are connected by a pipe joint so that the inside of the module container extends in the vertical direction, and fuel gas is supplied from the reformer to the fuel. A fuel gas supply pipe to be supplied to the gas manifold is configured, and the pipe joint is made of a material having lower heat resistance than the module container and the fuel gas supply pipe, and further made of a material having higher heat resistance than the pipe joint. It is provided with the scattering suppression cover which surrounds the perimeter of this.

  According to the present invention having such a configuration, since the pipe joint is surrounded by the scattering prevention cover, even if the pipe joint is affected by the heat from the combustion portion and the surface is peeled off as a powder, the powder is prevented from scattering. It can be captured by the cover. Thereby, contamination of the fuel cell by the powder peeled off from the pipe joint can be prevented without forming the pipe joint from an expensive heat-resistant material.

In this invention, Preferably, a scattering suppression cover consists of a several member, and encloses the perimeter of a pipe joint by making a several member fit.
According to the present invention having such a configuration, after the inflow side pipe and the outflow side pipe are connected by the pipe joint, the scattering prevention cover can be attached, so that the workability of the assembly work can be improved.

In the present invention, preferably, a plurality of members overlap each other at the bottom of the scattering prevention cover.
When a scattering suppression cover is constituted by a plurality of members, there is a possibility that the release powder leaks from the joint. On the other hand, according to the present invention having the above configuration, since a plurality of members are overlapped at the bottom, leakage of the release powder can be prevented.

In this invention, Preferably, the several member of a scattering suppression cover has a fitting part for a several member to fit in a side surface or a top | upper surface.
When the fitting portion is formed on the bottom surface, the peeling powder may fall from the gap between the fitting portions. On the other hand, according to this invention of the said structure, since the fitting part is formed in the side surface or the top | upper surface, it can prevent that peeling powder falls from a scattering suppression cover.

In the present invention, preferably, the scattering suppression cover is formed in a rectangular parallelepiped shape, and the inner wall surface of the module container is formed with a protruding surface protruding toward the fuel cell side, and one side surface of the scattering suppression cover, and the protruding surface, Are located on the same plane.
When the scattering suppression cover is provided, the scattering suppression cover may disturb the flow of combustion gas in the module container. When the combustion gas is disturbed in this way, the influence spreads to the upstream side, and the power generation air is not evenly sent to the fuel cells, resulting in temperature unevenness in the fuel cells. On the other hand, according to the present invention having the above configuration, since one side surface of the peeling prevention cover and the projecting surface of the module container are cured on the same plane, the combustion gas flowing through the combustion section is not disturbed, Thereby, the power generation air is evenly sent to the fuel cells, and the deterioration of the fuel cells can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the thermal deterioration of a pipe joint can be suppressed, without comprising a pipe joint with the material which has heat resistance.

1 is an overall configuration diagram showing a solid oxide fuel cell apparatus (SOFC) according to an embodiment of the present invention. FIG. 2 is a side sectional view showing a fuel cell module of a solid oxide fuel cell device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is a disassembled perspective view of a module case and an air passage cover. It is a perspective view which shows the inner surface of the closing side plate which comprises a module case. (A) is a perspective view which shows the 1st member which comprises a scattering suppression cover, (B) is a perspective view which shows the 2nd member which comprises a scattering suppression cover, (C) is 1st and 1st It is a perspective view which shows a mode that 2 members are attached. It is a vertical expanded sectional view of the apparatus longitudinal direction of the pipe joint vicinity in the state which attached the scattering suppression cover. It is a perspective view which shows the periphery of the scattering suppression cover in an assembly state. 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.

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 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 passing through the exhaust pipe 171 and an opening 160c for connecting 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).

  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). The power generation air is supplied into the air passage 161a from a power generation air introduction pipe 74 provided at a substantially central portion on the closed side plate 8e side of the module case 8 in the top plate 160a of the air passage cover 160 (FIG. 2). reference). 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).

  FIG. 5 is a perspective view showing the inner surface of the closing side plate 8 d constituting the module case 8. As shown in the figure, a first protrusion 180A and a second protrusion 180B are formed on the inner surface of the closing side plate 8d so as to extend in the vertical direction along the edges on both sides in the width direction. The first protrusion 180A and the second protrusion 180B each have a rectangular horizontal cross-sectional shape. The inner surfaces of the first projecting portion 180A and the second projecting portion 180B constitute projecting surfaces that project to the fuel cell side. A groove 180C having a rectangular cross section is formed between the first protrusion 180A and the second protrusion 180B.

  In addition, the air passages 161a and 161b have heat exchange promoting members that promote 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. Plate fins 162 and 163 are provided (see FIG. 3). The plate fins 162 are 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. That is, the plate fin 162 is provided in a portion corresponding to a later-described first exhaust passage 172a in the air passage 161a. Further, the plate fin 163 extends between the side plate 8b of the module case 8 and the side plate 160b of the air passage cover 160 and extends above the fuel cell unit 16 in the longitudinal direction and the vertical direction. Is provided. That is, the plate fins 163 are provided in portions corresponding to a second exhaust passage 172b and an exhaust concentration portion 176, which will be described later, in the air passage 161b.

  The power generation air flowing through the air passages 161a and 161b is inside the module case 8 inside the plate fins 162 and 163 (specifically along the top plate 8a and the side plate 8b), particularly when passing through the plate fins 162 and 163. Heat exchange is performed with the exhaust gas passing through the exhaust passage). For this reason, the portions where the plate fins 162 and 163 are provided in the air passages 161a and 161b function as a heat exchanger (heat exchange section). The portion provided with the plate fins 162 constitutes a main heat exchanger portion, and the portion provided with the plate fins 163 constitutes a subordinate heat exchanger portion.

  Next, the evaporator 140 is fixed 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.

  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, 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 so as to extend horizontally along the longitudinal direction of the module case 8 above the combustion chamber 18, 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. The fuel gas supply pipe 64 is divided into an inflow side pipe 64A connected to the manifold 66 and an outflow side pipe 64B connected to the reformer 120, and these inflow side pipe 64A and outflow side pipe 64B. Are connected by a pipe joint 64C. The pipe joint 64 </ b> C is formed of a material having lower heat resistance than the material constituting the inflow side pipe 64 </ b> A, the outflow side pipe 64 </ b> B, and the module case 8. The pipe joint 64 </ b> C is located obliquely above the fuel cell assembly 12.

  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.

  Further, the pipe joint 64C that connects the inflow side pipe 64A and the outflow side pipe 64B is surrounded by the scattering suppression cover 190. FIG. 6A is a perspective view showing a first member constituting the scattering suppression cover, FIG. 6B is a perspective view showing a second member constituting the scattering suppression cover, and FIG. It is a perspective view which shows a mode that a 2nd member is attached. FIG. 7 is a vertically enlarged cross-sectional view in the longitudinal direction of the apparatus in the vicinity of the pipe joint in a state where the scattering suppression cover is attached.

  As shown in FIG. 6A, the first member 191 has a rectangular parallelepiped shape such that one surface is open. Specifically, the first member 191 includes a lateral surface 191C, a front and rear surface 191D extending from front and rear edges of the lateral surface 191C, an upper surface 191A extending from an upper edge of the lateral surface 191C, and a lower surface of the lateral surface 191C. And a lower surface 191B extending from the edge. The upper and lower surfaces 191A and 191B are respectively formed with recesses 191F extending from the opening side. Further, a rectangular through hole 191E extending in the vertical direction is formed in the front and rear surface 191D.

As shown in FIG. 6B, the second member 192 has a rectangular parallelepiped shape such that one surface is open. Specifically, the second member 192 includes a lateral surface 192C, a front and back surface 192D extending from the front and rear edges of the lateral surface 192C, an upper surface 192A extending from an upper edge of the lateral surface 192C, and a lower surface of the lateral surface 192C. And a lower surface 192B extending from the edge. The upper and lower surfaces 192A and 192B are respectively formed with recesses 192F extending from the opening side. Further, a rectangular protrusion 192E extending in the vertical direction is formed on the front and rear surface 191D. In the protrusion 192E, the side on the opening side of the second member 192 is connected to the front and back surface 192D, and a gap is formed between the other side and the front and back surface 192D. The protruding portion 192E normally protrudes outward from the front and rear surface 192D, but can be bent until it is positioned inside the front and rear surface 192D. Further, the corners between the front and rear surfaces 192D and the upper and lower surfaces 192A and 192B are not connected, and a slit 192G is formed.
Here, the recesses 191F and 192F of the first member 191 and the second member 192 are preferably bent toward the inside of the case. Thereby, it can prevent that peeling powder falls from the clearance gap between the fuel gas supply pipe 64 and the recessed parts 191F and 192F.

  The first member 191 and the second member 192 are made of a material having higher heat resistance than the pipe joint 64C. More preferably, the module case 8 is made of the same material.

  As shown in FIG. 6C, when the scattering prevention cover 190 is attached, the opening side of the first member 191 and the second member 192 is disposed so as to face each other with the pipe joint 64C interposed therebetween. Then, the first member 191 and the second member 192 are brought close to each other so that the fuel gas supply pipe 64 enters the recesses 191F and 192F, respectively. At this time, the upper and lower surfaces 191 </ b> A and 191 </ b> B of the first member 191 enter the slit 192 </ b> G of the second member 192. When the first and second members 191 and 192 are brought close to each other until the edges of the upper and lower surfaces 191A and 191B of the first member 191 come into contact with the lateral surface 192C of the second member 192, the second member 192 The protruding portion 192E enters and fits into the through hole 191E of the first member 191. As described above, the scattering suppression cover 190 is configured by fitting the first and second members 191 and 192, and the upper surfaces 191A and 192A are in contact with the upper surface of the pipe joint 64C as shown in FIG. It is supported by touching. Further, in the state where the scattering suppression cover 190 is attached in this manner, the upper surfaces 191A and 192A and the lower surfaces 191B and 192B of the first and second members 191 and 192 overlap each other. A recovery space 194 is formed below the pipe joint 64 </ b> C in the scattering suppression cover 190.

  In the present embodiment, the through hole 191E of the first member 191 and the protrusion 192E of the second member 192 that are fitted to each other are formed on the front and rear surfaces 191D and 192D of the first and second members 191 and 192, respectively. However, the present invention is not limited to this, and the upper surfaces 191A and 192A may be provided. Moreover, in this embodiment, although the scattering suppression cover 190 is comprised by two members, you may comprise by three or more members.

  FIG. 8 is a perspective view showing the periphery of the scattering prevention cover in the assembled state. The closed side plate 8d is closed after the scattering suppression cover 190 is attached to the pipe joint 64C. And in the state which closed the closed side board 8d, the scattering suppression cover 190 is accommodated in the groove part 180C of the closed side board 8d. The surface of the scattering suppression cover 190 on the side of the fuel cell unit 16 is located on the same plane as the protruding surface of the first protrusion 180A and the second protrusion 180B of the closing side plate 8d on the fuel cell unit 16 side. Yes.

  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) 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, which 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. 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. 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, and the plate fins 162, 163 in the air passages 161a, 161b are connected to the first exhaust passage 172a. Similar plate fins 175a are arranged. The plate fins 175a are provided at substantially the same location as the plate fins 162 when viewed from above, and face each other in the vertical direction across the top plate 8a.

  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. Also in the second exhaust passage 172b, plate fins 175b similar to the plate fins 162 and 163 in the air passages 161a and 161b are arranged. The lower end of the plate fin 175b extends to the height of the lower guide plate 131.

  Of the air passages 161a, 161b and the first and second exhaust passages 172a, 172b, in the portions where the plate fins 162, 163, 175a, 175b are provided, the power generation air flowing through the air passages 161a, 161b and the first and second Efficient heat exchange is performed with the exhaust gas flowing through the second exhaust passages 172a and 172b, and the power generation air is heated 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. A third exhaust passage 173 is 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. 9 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. 9, 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. 10 and 11. 10 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. 11 is similar to FIG. It is sectional drawing along the -III line. FIGS. 10 and 11 are diagrams in which arrows indicating gas flows 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. 10, water and raw fuel gas (fuel gas) are fed into an evaporation section 140 </ b> B provided in an 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 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 first exhaust passage 172a in this order, the mixed gas in the mixed gas supply pipe 112 is further increased by the exhaust gas flowing through these passages. Heated.

  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. 10 and 11, the power generation air is supplied from the power generation air introduction pipe 74 to the air passage 161a. When the power generation air passes through the plate fins 162 and 163 in the air passages 161 a and 161 b, the first and second exhaust passages 172 and 172 formed in the module case 8 below the plate fins 162 and 163. Efficient heat exchange is performed with the exhaust gas passing through 173, and the exhaust gas 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. 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. 11, 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 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 the reformer 120. The through-hole 120b passes between the reformer 120 and the exhaust gas guiding member 130. At this time, the exhaust gas passing through the fourth 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 remains in the lower portion of the exhaust gas guiding member 130. Without being guided toward the third exhaust passage 173, the exhaust concentration portion 176 joins the exhaust gas flowing through the third exhaust passage 173. Here, since the plate fins 175b are provided in the second exhaust passage 172, the exhaust gas that has passed through the third exhaust passage 173 and the fourth exhaust passage 174 stays in the exhaust concentration section 176 (see FIG. 11A). Part).

  Thereafter, the exhaust gas is introduced from the exhaust concentration portion 176 into the second exhaust passage 172b. Then, the exhaust gas that has passed through the second exhaust passage 172 b flows in the horizontal direction through the first exhaust passage 172 a and flows out from the exhaust port 111 formed at the center of the top plate 8 a of the module case 8.

  When the exhaust gas stays in the exhaust concentration portion 176, heat is generated between the power generation air and the exhaust gas via the plate fins 163 provided in the portion corresponding to the exhaust concentration portion 176 in the air passage 161b. Exchange is performed. Further, when the exhaust gas flows through the second exhaust passage 172b and the first exhaust passage 172a, the plate fins 175b and 175a provided in the second and first exhaust passages 172b and 172a, and the air passages 161a and 161b. Through the plate fins 162 and 163 provided at portions corresponding to the inner plate fins 175b and 175a, 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.

  In the combustion chamber 18, when the remaining fuel gas and the remaining air that have not been used for the power generation reaction are burned in the combustion chamber 18, the pipe joint 64C is exposed to a high temperature. As described above, when the pipe joint 64C is exposed to a high temperature, the surface of the pipe joint 64C deteriorates and peels into a powder form. However, the powder peeled from the pipe joint 64 </ b> C in this way is accommodated in the recovery space 194 in the scattering suppression cover 190 and does not scatter in the module case 8.

  As described above, according to the above embodiment, since the pipe joint 64C is surrounded by the scattering suppression cover 190, the pipe joint 64C is affected by the heat from the combustion chamber 18 and the surface peels off as a powder. Also, the release powder can be captured by the scattering suppression cover 190. Thereby, the contamination of the fuel cell unit 16 by the powder peeled off from the pipe joint 64C can be prevented without forming the pipe joint with a heat resistant material.

  Moreover, according to the said embodiment, the scattering suppression cover 190 is comprised by making the 1st and 2nd members 191 and 192 fit. Thereby, after connecting inflow side piping 64A and outflow side piping 64B with pipe joint 64C, scattering control cover 190 can be attached and workability of assembly work can be improved.

  Further, according to the above embodiment, the first and second members 191 and 192 overlap at the bottom of the scattering prevention cover 190. Thereby, there is no seam at the bottom, and the release powder can be prevented from leaking.

  For example, when a through hole is provided in the lower surfaces of the first and second members, the peeling powder may fall from the through hole. On the other hand, according to the above embodiment, since the through holes 191E and the protrusions 192E are provided on the front and rear surfaces 191D and 192D of the first and second members 191, 192, the peeling powder is removed from the scattering prevention cover 190. Can prevent falling.

  Further, according to the above embodiment, the surface of the scattering suppression cover 190 on the fuel cell unit 16 side is the protruding surface of the first protruding portion 180A and the second protruding portion 180B of the closing side plate 8d on the fuel cell unit 16 side. Are located on the same plane. As a result, the combustion gas flowing through the combustion chamber 18 is prevented from being disturbed, whereby the power generation containers are evenly sent to the fuel cell unit 16. Thereby, it is possible to prevent temperature unevenness from occurring in the fuel cell unit 16 and to prevent deterioration of the fuel cell unit 16.

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 insulation layer (gas reservoir)
140 Evaporator 140A Exhaust passage part 140B Evaporation part 140C Mixing part 141 Evaporator case 142 Upper case 143 Lower case 144 Intermediate plate 144a Opening 160 Air passage cover 160a Top plate 160b Side plate 161a Air passage 161b Air passage 162 Plate fin 163 Plate fin 164 Flow path direction adjusting portion 167 Opening portion 171 Exhaust pipe 172a First exhaust passage 172b Second exhaust passage 173 Third exhaust passage 174 Fourth exhaust passage 175a Plate fin 175b Plate fin 176 Exhaust concentration portion 180A First protrusion 180B First Two protrusions 180C Groove 190 Splashing suppression cover 191 First member 191A Upper surface 191B Lower surface 191C Horizontal surface 191D Front and rear surfaces 191E Through hole 191F Recess 192 Second member 192A Upper surface 192B Lower surface 192C Lateral surface 192D Front and rear surfaces 192E Protruding portion 192F Recessed portion 192G Slit

Claims (5)

A solid oxide fuel cell device comprising:
A plurality of fuel cells that generate electricity by a reaction between power generation air and fuel gas obtained by steam reforming;
A module container for housing the plurality of fuel cells;
A combustion section that is provided above the plurality of fuel cells in the module container and that generates exhaust gas by burning fuel gas that has not contributed to power generation of the plurality of fuel cells;
A reformer that is provided above the combustion section and that reforms the raw material gas with steam to produce the fuel gas;
Power generation air supply means for supplying the power generation air to the fuel cell;
A fuel gas manifold located below the plurality of fuel cells and supplying the fuel gas to the internal flow paths of the plurality of fuel cells;
An inflow side pipe for supplying the fuel gas to the fuel gas manifold;
An outflow side pipe to which the fuel gas is supplied from the reformer;
A pipe joint for connecting the inflow side pipe and the outflow side pipe,
The inflow side pipe and the outflow side pipe are connected by the pipe joint, so that the inside of the module container extends in the vertical direction, and a fuel gas supply pipe that supplies fuel gas from the reformer to the fuel gas manifold Is configured,
The pipe joint is made of a material having lower heat resistance than the module container and the fuel gas supply pipe,
The solid oxide fuel cell device further comprises a scattering suppression cover made of a material having higher heat resistance than the pipe joint and surrounding the entire circumference of the pipe joint. The scattering suppression cover is composed of a plurality of members,
The solid oxide fuel cell device according to claim 1, wherein the plurality of members are fitted to surround the entire circumference of the pipe joint.   The solid oxide fuel cell device according to claim 2, wherein the plurality of members overlap each other at a bottom portion of the scattering suppression cover.   4. The solid oxide fuel cell device according to claim 3, wherein the plurality of members of the scattering suppression cover have a fitting portion for fitting the plurality of members on a side surface or a top surface. 5. The scattering suppression cover is formed in a rectangular parallelepiped shape,
On the inner wall surface of the module container, a protruding surface that protrudes toward the fuel cell side is formed,
5. The solid oxide fuel cell device according to claim 1, wherein one side surface of the scattering suppression cover and the protruding surface are located on the same plane.

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