JP5342763B2 - Fuel cell device - Google Patents

Description

  The present invention relates to an exhaust gas treatment device for treating exhaust gas generated by power generation of a fuel cell and a fuel cell device including a heat exchanger.

  2. Description of the Related Art In recent years, various fuel cell devices in which a fuel cell stack formed by arranging a plurality of fuel cells is accommodated in a storage container and its operation method (system) have been proposed as next-generation energy.

  In such a fuel cell apparatus, a reformer for reforming raw fuel such as natural gas into a hydrogen-containing gas is provided, and the hydrogen-containing gas and the oxygen-containing gas are supplied to the fuel cell. Then, power generation of the fuel battery cell is performed.

  By the way, in a reformer, when a component contained in a raw fuel such as natural gas is reformed to a hydrogen-containing gas, carbon monoxide which is a harmful component may be generated. Also, incomplete operation during operation of the fuel cell device (during start-up processing, power generation, and stop processing), especially during high-efficiency power generation (that is, operation at a high fuel utilization rate) or at a high air utilization rate In some cases, carbon monoxide or the like is contained in the exhaust due to combustion or the like.

  Therefore, in order to prevent exhaust gas containing harmful components such as carbon monoxide from being exhausted outside the fuel cell device, for example, a plurality of solid oxide fuel cells are housed in the housing and discharged from the fuel cells. There has been proposed a fuel cell including a purification device that purifies the combustion exhaust gas (see, for example, Patent Document 1).

On the other hand, a fuel cell device that includes a heat exchanger for exchanging heat between combustion exhaust gas and water and supplies condensed water generated by heat exchange to a reformer is also known (see, for example, Patent Document 2). .)
JP 2006-32291 A JP 2006-179386 A

  By the way, in the treatment of exhaust gas generated by the operation of the fuel cell device, in the fuel cell device using the exhaust gas treatment device in which the combustion catalyst is housed in the catalyst housing case, the stop processing of the fuel cell device (power generation of the fuel cell) In the stop process), water contained in the exhaust gas is generated as condensed water, and the condensed water may penetrate into the combustion catalyst or adhere to the surface of the combustion catalyst.

  Here, in particular, when the fuel cell device is restarted in a state where water has permeated into the combustion catalyst, the combustion catalyst may be damaged when water vaporizes as the temperature of the combustion catalyst rises. Furthermore, the damaged combustion catalyst, components contained in the exhaust gas, and the like may adhere to form a lump, and it may be difficult to efficiently treat the exhaust gas.

  Furthermore, when the water contained in the exhaust gas is condensed in the catalyst storage case, the condensed water may accumulate at the bottom of the catalyst storage case and the combustion catalyst may get wet.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fuel cell device that can suppress damage to a combustion catalyst that occurs when the fuel cell device is stopped and restarted.

A fuel cell device of the present invention is for generating a plurality of solid oxide fuel cells and fuel gas to be supplied to the fuel cells in a storage container having an exhaust hole for exhausting exhaust gas. A fuel cell module containing a reformer, an exhaust gas treatment device for treating exhaust gas exhausted from the exhaust hole of the fuel cell module, and an exhaust gas and water after being treated by the exhaust gas treatment device A heat exchanger for exchanging heat with the heat exchanger, and supplying the first condensate generated by the heat exchange in the heat exchanger to the reformer, wherein the exhaust gas treatment device comprises: And a catalyst storage case for storing the combustion catalyst, the catalyst storage case having a storage portion for storing the combustion catalyst on the upper side and the fuel cell device on the lower side. In the shutdown process Together comprising comprises a condensed water recovery unit for recovering the second condensate with temperature decrease of the exhaust gas generated in said catalyst housing case, the exhaust gas treatment apparatus provided below the fuel cell module The heat exchanger is installed below the exhaust gas treatment device, and the catalyst storage case constituting the exhaust gas treatment device is exhausted from the fuel cell module on the upper surface. An exhaust gas inflow part for allowing the exhaust gas to flow in is provided, and an exhaust part for discharging exhaust gas that has been circulated and processed in the catalyst storage case and condensed water recovered in the condensed water recovery part is provided on the lower surface. It is characterized by that.

  In such a fuel cell device, the exhaust gas treatment device for treating the exhaust gas generated during operation of the fuel cell device includes a combustion catalyst and a catalyst storage case for storing the combustion catalyst, and a catalyst storage case Has a storage part for storing the combustion catalyst on the upper side, and collects the second condensed water generated in the catalyst storage case as the exhaust gas temperature decreases in the operation stop processing of the fuel cell device on the lower side. Since the condensate recovery unit is provided, the temperature of the exhaust gas exhausted from the fuel cell module is lowered by the operation stop processing of the fuel cell device, and the water contained in the exhaust gas is condensed water (second condensed When generated as water), the generated condensed water flows to the condensed water recovery unit.

  Thereby, in the operation stop processing of the fuel cell device, it is possible to suppress the condensed water (second condensed water) generated due to the temperature decrease of the exhaust gas from being collected in the storage unit for storing the combustion catalyst, and to flow between the combustion catalysts. Since water (second condensed water) tends to flow toward the condensed water recovery unit, it is possible to prevent the second condensed water from penetrating into the combustion catalyst or adhering to the surface, and restarting the fuel cell device It is possible to prevent the combustion catalyst from being damaged at times.

In the fuel cell device of the present invention, the exhaust gas treatment device is installed so as to be surrounded by a heat insulating material provided below the fuel cell module , and the heat exchanger is installed below the exhaust gas treatment device. In addition, the catalyst storage case constituting the exhaust gas treatment apparatus has an exhaust gas inflow portion for allowing the exhaust gas exhausted from the fuel cell module to flow into the upper surface, and flows through the catalyst storage case on the lower surface. the condensed water recovered by the treated exhaust gas and the condensed water recovery unit Ru provided with a discharge portion for discharging.

In such a fuel cell device, an exhaust gas treatment device is provided so as to be surrounded by a heat insulating material provided below the fuel cell module, a heat exchanger is provided below the catalyst, and a catalyst constituting the exhaust gas treatment device The storage case has an exhaust gas inflow part for allowing exhaust gas to flow into the upper surface, and an exhaust part for discharging the exhaust gas processed through the catalyst storage case on the lower surface and the condensed water recovered by the condensed water recovery unit Therefore, the exhaust gas exhausted from the fuel cell module flows into the catalyst storage case from the exhaust gas inflow part, and after being processed by the combustion catalyst stored in the storage part, the processed exhaust gas is from the exhaust gas inflow part. It is exhausted and supplied to the heat exchanger. Thereby, it is possible to efficiently perform the treatment of the exhaust gas generated along with the operation of the fuel cell device and the heat exchange between the treated exhaust gas and water.

  In addition, the condensed water (second condensed water) generated in the catalyst storage case and recovered in the condensed water recovery unit is supplied to the heat exchanger through the discharge unit, and the condensed water generated in the heat exchanger ( Since it is supplied to the reformer together with the first condensed water), the condensed water can be recovered efficiently.

  In the fuel cell device of the present invention, it is preferable that at least a part of the bottom surface of the condensed water recovery portion has a recess, and the recess and the discharge portion communicate with each other.

  In such a fuel cell device, the condensate recovered at the condensate recovery unit has a recess because at least a part of the bottom surface of the condensate recovery unit has a recess and the recess and the discharge part communicate with each other. It becomes easy to flow toward the discharge part. Moreover, since the recessed part and the discharge part are connected, the condensed water (2nd condensed water) which flows through a recessed part is discharged | emitted from a discharge part, and is supplied to a heat exchanger. Therefore, it is possible to prevent the condensed water (second condensed water) from penetrating into the combustion catalyst or adhere to the surface, and to prevent the combustion catalyst from being damaged when the fuel cell device is restarted.

  In the fuel cell device of the present invention, it is preferable that a rectifying member for rectifying the exhaust gas flowing in from the exhaust gas inflow portion is provided in the storage portion.

  In such a fuel cell device, since the storage portion includes a rectifying member for rectifying the exhaust gas flowing from the exhaust gas inflow portion, the exhaust gas is prevented from flowing only in a specific part of the storage portion for storing the combustion catalyst. can do. Thereby, exhaust gas treatment can be performed efficiently.

  A fuel cell device of the present invention includes a fuel cell module in which a plurality of fuel cells and a reformer for supplying fuel cells are housed in a storage container having an exhaust hole for exhausting exhaust gas. An exhaust gas treatment apparatus comprising a combustion catalyst and a catalyst storage case for containing the combustion catalyst for treating the exhaust gas exhausted from the exhaust hole of the fuel cell module; and exhaust gas and water treated by the exhaust gas treatment apparatus; The catalyst storage case has a storage portion for storing the combustion catalyst on the upper side, and the temperature of the exhaust gas in the operation stop processing of the fuel cell device on the lower side. A condensate recovery unit is provided for recovering the second condensate generated in the catalyst storage case in accordance with the decrease, and thus occurs in the catalyst storage case in the stop processing of the fuel cell device. Condensed water (second condensed water) can be effectively recovered, can be suppressed combustion catalyst may be damaged at the restart of the fuel cell apparatus.

FIG. 1 is an external perspective view showing an example of a fuel cell module 1 (hereinafter sometimes referred to as a module) constituting a fuel cell device of the present invention. In the following drawings, the same numbers are assigned to the same members. The module 1 is arranged in a state where a fuel cell 3 having a gas flow path through which gas flows is erected in a rectangular parallelepiped storage container 2, and a current collecting member between adjacent fuel cells 3 A fuel cell stack which is electrically connected in series via (not shown) and the lower end of the fuel cell 3 is fixed to the manifold 4 with an insulating bonding material (not shown) such as a glass sealing material 5 (hereinafter sometimes referred to as a cell stack). In FIG. 1, the fuel battery cell 3 is a hollow plate type in which fuel gas flows in a longitudinal direction through a gas flow path provided inside the fuel battery cell 3. and comprises a fuel cell 3 of the solid oxide formed by providing an electrolyte and the oxygen-side electrode in this order.

  Further, in order to obtain a hydrogen-containing gas used in the fuel cell 3, a reformer 6 for reforming a fuel such as natural gas or kerosene to generate a fuel gas (hydrogen-containing gas) is provided in the cell stack 5. Arranged at the top of the. The fuel gas generated by the reformer 6 is supplied to the manifold 4 through the gas flow pipe 7 and supplied to the gas flow path provided inside the fuel battery cell 3 via the manifold 4. And the fuel cell stack apparatus 8 is comprised by these structures.

  FIG. 1 shows a state in which a part (front and rear surfaces) of the storage container 2 is removed and the fuel cell stack device 8 stored inside is taken out rearward. Here, in the module 1 shown in FIG. 1, the fuel cell stack device 8 can be slid and stored in the storage container 2.

  FIG. 2 is a cross-sectional view of the module 1 shown in FIG. 1 and shows an example of the module 1 in which the temperature sensor 15 is arranged.

  The storage container 2 constituting the module 1 has a double structure having an inner wall 10 and an outer wall 11, and an outer frame of the storage container 2 is formed by the outer wall 11, and a cell stack 5 (fuel cell stack apparatus 8 is formed by the inner wall 10. ) Is formed.

  Further, in the module 1, a reaction gas flow path introduced into the fuel cell 3 is formed between the inner wall 10 and the outer wall 11, and for example, a reaction gas such as an oxygen-containing gas introduced into the fuel cell 3 flows.

  Here, the inner wall 10 extends from the upper surface of the inner wall 10 to the side surface side of the cell stack 5, corresponds to the width in the arrangement direction of the cell stack 5, and leads to a flow path formed by the inner wall 10 and the outer wall 11. A reaction gas introduction member 13 for introducing a reaction gas into the cell stack 5 is provided. Further, an outlet 14 for introducing a reaction gas into the fuel cell 3 is provided at the lower end side of the reaction gas introduction member 13 (the lower end side of the fuel cell 3).

  In FIG. 2, the reaction gas introduction member 13 is formed by forming a reaction gas introduction flow path by a pair of plate members arranged in parallel at a predetermined interval and joining the bottom member on the lower end side. In FIG. 2, the reaction gas introduction member 13 is disposed so as to be positioned between two cell stacks 5 (fuel cell stack device 8) juxtaposed inside the storage container 2. Note that the reaction gas introduction member 13 may be arranged so as to sandwich the cell stack 5, for example, depending on the number of cell stacks 5 accommodated.

  The temperature sensor 15 is inserted into the reaction gas introduction member 13 from the upper surface side of the storage container 2 so that the temperature measuring unit 16 of the temperature sensor 15 is located. For example, a thermocouple can be used as the temperature sensor 15.

Here, since the fuel cell 3 is operated in a predetermined temperature range, it is necessary to measure the temperature in the power generation chamber 9 (preferably the cell stack 4 or the vicinity thereof) and to manage the temperature. Particularly fuel cells, since it is a solid oxide fuel cell, the operating temperature is very high, the temperature of the fuel cell 3 (the cell stack 5) is excessively increased, the power generation amount is decreased, Ya further deterioration Since the fuel cell 3 (cell stack 5) may be damaged due to thermal stress, it is particularly necessary to effectively measure the temperature in the vicinity of the cell stack 5 and manage the temperature. Therefore, the temperature sensor 15 is positioned at the center side where the temperature measuring unit 16 reaches the highest temperature of the cell stack 5 (the center portion in the arrangement direction of the cell stack 5 and the center portion in the longitudinal direction of the fuel cell 3). It is preferable to arrange so that the portion to be measured can be measured.

  Also, in the power generation chamber 9, the temperature in the module 1 is maintained at a high temperature so that the heat in the module 1 is extremely dissipated and the temperature of the fuel cell 3 (cell stack 5) is lowered and the power generation amount is not reduced. A heat insulating material 17 is appropriately provided.

  Here, in order to maintain the temperature of the fuel cell 3 (cell stack 5) at a high temperature, it is preferable to arrange a heat insulating material in the vicinity of the cell stack 5, and in particular, the cells along the arrangement direction of the fuel cell 3 It is preferable that the heat insulating material 17 having a size equal to or larger than the outer shape of the side surface of the cell stack 5 is provided in parallel with the side surface of the stack 5. In addition, it is preferable that the cell stack 5 is arranged in parallel on both side surfaces. Thereby, it can suppress effectively that the temperature of the cell stack 5 falls.

  Further, by providing a heat insulating material 17 having a size equal to or larger than the outer shape of the side surface of the cell stack 5 on the side surface side of the cell stack 5, the gas supplied from the reaction gas introduction member 13 is allowed to flow. It is possible to suppress the discharge from the side surface side of the fuel cell, and the flow of the reaction gas between the fuel cells 3 constituting the cell stack 5 can be promoted.

  In addition, it is preferable that the lower end side of the heat insulating material 17 arrange | positioned at the reaction gas introduction member 13 side has a notch part for supplying reaction gas to the fuel cell 3. FIG.

  Further, on the inner side of the inner wall 10, the inner wall 10 (inner side surface) and the inner wall 10 (inner side surface) positioned on the side surface along the arrangement direction of the fuel cells 3 are arranged with a predetermined interval therebetween. The exhaust gas flow path is formed by the provided exhaust gas inner wall 12, and the exhaust gas generated on the bottom surface side of the storage container 2 is exhaust gas generated with the operation of the fuel cell device (during start-up processing, power generation, stop processing). It is configured to exhaust from the hole 18.

  FIG. 3 is a side view schematically showing the fuel cell device 19 of the present invention including the module 1 described above, in which a part of the outer case is removed so that the inside of the outer case can be seen. Show.

  In FIG. 3, the fuel cell device 19 includes a partition member 21 in an outer case 20, and a fuel cell module storage chamber 22 (hereinafter abbreviated as a module storage chamber) in which the module 1 is disposed on the partition member 21. Is formed. Further, an auxiliary machine for housing auxiliary equipment (only a blower for supplying air to the module 1 is shown in FIG. 3) necessary for operating the module 1 below the partition member 21. A storage chamber 24 is formed. The partition member 21 only needs to partition the module storage chamber 22 and the accessory storage chamber 24, and the module storage chamber 22 and the accessory storage chamber 24 may be partitioned with a gap.

  Further, for example, the outer casing 20 is divided into left and right portions by a partition member 21, and one is a fuel cell module housing chamber 22 for housing the module 1, and the other is an auxiliary machinery housing chamber 24 for storing auxiliary machinery. It can also be.

  In addition, the fuel cell apparatus 19 can be made into a compact shape by using the partition member 21 as shown in FIG.

  Here, the exhaust gas generated by the operation of the fuel cell device 19 is supplied to the exhaust gas treatment device 25 in order to remove harmful components such as carbon monoxide contained in the exhaust gas, and the exhaust gas treated by the exhaust gas treatment device 25 is supplied. Subsequently, the heat exchanger 26 is supplied. As a result, the exhaust gas can be treated efficiently and the heat of the exhaust gas can be efficiently recovered.

Therefore, in the fuel cell system 19 of the present invention, the exhaust gas treatment apparatus 25 provided below the module 1 (exhaust port 18 of the container 2), Ru provided a heat exchanger 26 below the exhaust gas treatment apparatus 25.

  In FIG. 3, the upper end of the exhaust gas treatment device 25 (catalyst storage case 30 described later) is connected to the bottom surface of the module 1 (storage container 2), and the upper end of the heat exchanger 26 is connected to the lower end of the exhaust gas treatment device 25. Has been. In this way, by directly connecting each of the module 1, the exhaust gas treatment device 25, and the heat exchanger 26, the flow of the exhaust gas becomes linear, and the exhaust gas can be processed efficiently, and the processing in the heat exchanger is performed. The heat exchange between the later exhaust gas and water can be performed efficiently.

  FIG. 4 shows the module 1, the exhaust gas treatment device 25, and the heat exchanger 26 in order to schematically show the case where the module 1, the exhaust gas treatment device 25, and the heat exchanger 26 are directly connected as described above. FIG.

  Here, a heat insulating material 17 is provided around the module 1, the exhaust gas treatment device 25 and the heat exchanger 26 are disposed on the bottom surface (lower surface) of the module 1, and the exhaust gas treated by the exhaust gas treatment device 25 exchanges heat. The exhaust gas flow passages provided in the heat exchanger 26 are connected in order so as to face the vertical direction so that the exhaust gas flow passages of the vessel 26 flow from the top to the bottom. In addition, although mentioned later for details, the exhaust part 35 is provided in the lower surface of the waste gas processing apparatus 25, and the exhaust part 35 and the heat exchanger 26 are connected. The exhaust gas treatment device 25 and the heat exchanger 26 can be connected via a fixing member (not shown) such as a screw or a rivet. The bottom surface of the module 1 (or the heat insulating material 17 provided on the bottom surface) is fixed to the partition member 21.

  In addition, the plate fin type heat exchanger is illustrated as the heat exchanger 26 shown in FIG. 3 and FIG.

  Here, in the plate fin type heat exchanger 26, the water flows from the bottom to the top on the lower side of the side surface of the heat exchanger 26 (the surface other than the surface on which the plates are laminated). A water introduction part 27 is provided to flow, and a water supply part 28 after heat exchange is provided on the upper side of the side surface of the heat exchanger 26. A water supply pipe is connected to each of the water introduction part 27 and the post-heat exchange water supply part 28 (not shown), and the water after heat exchange (to the hot water storage tank provided outside the fuel cell device 19 ( Hot water) will be stored.

  A gas-liquid separation for separating condensed water (first condensed water) generated by heat exchange between the treated exhaust gas and water and the exhaust gas after heat exchange is provided below the heat exchanger 26. A member 29 is provided, and exhaust gas after heat exchange can be exhausted in the side surface direction of the heat exchanger 26, and condensed water can be drained downward in the heat exchanger 26.

  Then, by supplying the reformed water (condensed water separated by the gas-liquid separation member 29) generated by heat exchange in the heat exchanger 26 to the reformer 6, the fuel cell device 19 having improved power generation efficiency, can do. The structure of the gas-liquid separation member 29 can be adjusted as appropriate depending on the structure of the fuel cell device 19.

  FIG. 5 shows an extracted exhaust gas treatment device 25 in the fuel cell device 19 of the present invention, and a combustion catalyst 32 on the upper side by a mesh-like partition member 31 provided inside the catalyst storage case 30. And a condensate recovery for recovering the second condensate generated in the catalyst storage case 30 as the temperature of the exhaust gas decreases in the operation stop processing of the fuel cell device 19 on the lower side. Part 34.

  Further, an exhaust gas inflow portion 36 for allowing exhaust gas exhausted from the exhaust hole 18 of the module 1 to flow in is provided on the upper surface of the catalyst storage case 30, and stored in the storage portion 33 on the lower surface of the catalyst storage case 30. A discharge unit 35 for discharging the exhaust gas treated by the combustion catalyst 32 and the condensed water (second condensed water) recovered by the condensed water recovery unit 34 is provided.

  There are cases where harmful components such as carbon monoxide are contained in the exhaust gas generated by the operation of the fuel cell device 19. Therefore, it is necessary to make the exhaust gas harmless by the combustion catalyst 32 disposed in the exhaust gas processing device 25 (the storage unit 33) and exhaust the exhaust gas.

  Here, as the combustion catalyst 32, a generally known combustion catalyst 32 can be used. Thereby, the exhaust gas generated with the operation of the fuel cell device 19 can be rendered harmless. However, for example, when using a combustion catalyst 32 in which a noble metal or the like is supported on a porous support (the noble metal is supported on or inside the support), depending on the type of the combustion catalyst 32 (for example, γ -In the case of a combustion catalyst in which a catalyst is supported on a porous carrier such as alumina), during the stop process of the fuel cell device 19 (at the time of power generation stop process of the fuel cell 3), Water contained in the exhaust gas may be generated as second condensed water in the catalyst storage case 30, and the second condensed water may penetrate into the combustion catalyst 32 or adhere to the surface of the combustion catalyst 32.

  When the fuel cell device 19 is restarted in a state where water has permeated into the combustion catalyst 32, as the temperature of the combustion catalyst 32 rises, the combustion catalyst is caused by volume expansion accompanying vaporization of the water that has penetrated into the combustion catalyst 32. 32 may be damaged. Furthermore, the components contained in the damaged combustion catalyst 32 and the exhaust gas may be attached to form a lump, and the exhaust gas in the exhaust gas treatment device 25 may not be efficiently processed.

  Further, when the second condensed water is generated in the catalyst storage case 30 due to the stop processing of the fuel cell device 19, the condensed water is collected at the bottom of the exhaust gas processing device 25 (catalyst storage case 30), and the accumulated condensation. The combustion catalyst 32 may get wet with water.

  Therefore, in the fuel cell device 19 of the present invention, the exhaust gas treatment device 25 includes a combustion catalyst 32 and a catalyst storage case 30 for storing the combustion catalyst 32, and the catalyst storage case 30 is located on the upper side. And a condensate recovery unit 34 for recovering condensate (second condensate) generated in the catalyst storage case 30 as the exhaust gas temperature decreases. Composed.

  As a result, the second condensed water generated during the stop process of the fuel cell device 19 flows into the condensed water recovery unit 34, and can be prevented from collecting in the storage unit 33 that stores the combustion catalyst 32. Further, since the storage portion 33 is provided on the lower side of the catalyst storage case 30, the water (condensed water) flowing between the combustion catalysts 32 is likely to flow toward the condensed water recovery portion 34.

  Thereby, it is possible to prevent the condensed water from penetrating into the combustion catalyst 32 or adhere to the surface of the combustion catalyst 32, and to prevent the combustion catalyst 32 from being damaged when the fuel cell device 19 is restarted.

  A discharge unit 35 for supplying the condensed water recovered by the condensed water recovery unit 34 and the exhaust gas treated by the combustion catalyst 32 to the heat exchanger 27 is provided on the lower surface (bottom surface) of the catalyst storage case 30. It has. Further, the exhaust gas inflow part 36 provided on the upper surface of the partition member 31, the discharge part 35, and the catalyst storage case 30 is preferably in a shape that allows the exhaust gas to circulate efficiently, for example, can have a mesh shape. 5, the exhaust gas inflow portion 36 and the partition member 31 are shown in a mesh shape.

  The exhaust gas inflow portion 36 (upper surface of the catalyst storage case 30) is connected to the bottom surface (lower surface) of the storage container 2 (module 1), and the heat exchanger 26 is connected to the discharge portion 35 provided on the lower surface of the catalyst storage case 30. By being connected, the flow of the exhaust gas generated along with the operation of the fuel cell device 19 becomes more linear, and the exhaust gas treatment and the heat exchange between the treated exhaust gas and water can be performed efficiently.

  In addition, the second condensate generated along with the stop process of the fuel cell device 19 is supplied to the heat exchanger 26 through the condensate recovery unit 34, and is combined with the first condensate generated by the heat exchanger 26. By supplying to the reformer 6, the condensed water can be efficiently recovered.

  FIG. 6 shows another embodiment of the exhaust gas treatment device 25, in which a discharge portion 37 is provided on the lower surface of the catalyst storage case 30 and at least a part of the bottom surface of the condensed water recovery portion 34. The catalyst storage case 30 which has the recessed part 38 and the recessed part 38 and the discharge part 37 are connecting is shown.

  Thereby, the second condensed water generated by the stop process of the fuel cell device 19 easily flows toward the discharge portion 37 through the concave portion 38 provided in at least a part of the bottom surface of the condensed water recovery portion 34. As a result, the second condensed water recovered in the condensed water recovery unit 34 easily flows into the heat exchanger 26, and thus the second condensed water is prevented from penetrating the combustion catalyst 30 or adhering to the surface. This can prevent the combustion catalyst 30 from being damaged when the fuel cell device 19 is restarted.

  In addition, as for the recessed part 38 provided in the bottom face of the condensed water collection | recovery part 34, a part of bottom face may become a recessed part, and it is good also considering the whole bottom face as the recessed part 38. FIG.

  FIG. 7 shows an example in which a rectifying member 39 for rectifying the exhaust gas flowing in from the exhaust gas inflow portion 36 is provided in the catalyst storage case 30 (storage portion 33), and the rectifying member 39 is connected to the exhaust gas inflow portion 36. doing.

  Since the exhaust gas supplied to the catalyst storage case 30 has a characteristic of flowing through a portion having a low pressure loss resistance, the exhaust gas tends to flow particularly in a specific portion of the combustion catalyst 32 stored in the catalyst storage case 30 (storage portion 33). In this case, the deterioration of the combustion catalyst 32 in the region where the exhaust gas easily flows is accelerated, and the life of the combustion catalyst 32 located in the region where the exhaust gas is difficult to flow becomes long, and it may be difficult to efficiently process the exhaust gas. Further, when the combustion catalyst 30 is damaged and becomes a lump when the fuel cell device is restarted, the exhaust gas may not be efficiently processed.

  Therefore, in the exhaust gas treatment device 25 shown in FIG. 7, by providing a rectifying member 39 for rectifying the exhaust gas flowing in from the exhaust gas inflow portion 36, it is possible to suppress the exhaust gas from flowing only in a specific part of the storage unit 30. By doing so, exhaust gas can be treated efficiently.

  In FIG. 7, the quadrangular pyramid-shaped rectifying member 39 is shown, but it may be, for example, a plate shape, and the arrangement location and the quantity to be installed can be appropriately set according to the flow rate of the exhaust gas.

  Although the present invention has been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made without departing from the scope of the present invention.

  For example, in FIG. 3, another exhaust gas treatment device (second exhaust gas treatment device) is provided in the vicinity of the fuel cell 3, particularly at the exhaust gas inlet of the exhaust gas passage formed by the inner wall 11 and the exhaust gas inner wall 12. You can also In this case, when the exhaust gas temperature at the start of the fuel cell device 19 is low, the exhaust gas can be treated by the exhaust gas treatment device (second exhaust gas treatment device) provided at the exhaust gas inlet of the exhaust gas passage. Thereby, the exhaust gas can be treated efficiently.

  Further, in this case, the exhaust gas temperature at the exhaust gas inlet of the exhaust gas channel is higher than the temperature of the exhaust gas exhausted from the exhaust hole 21, so that the operating temperature is higher than that of the combustion catalyst 30 used in the exhaust gas treatment device 17. A combustion catalyst can be used, whereby exhaust gas can be treated efficiently.

It is the external appearance perspective view which extracted and showed the fuel cell module in the fuel cell apparatus of this invention. It is sectional drawing of the fuel cell module in the fuel cell apparatus of this invention. It is the schematic which shows an example of the fuel cell apparatus of this invention. It is the front view which extracted a part of fuel cell device of the present invention which shows connection with an exhaust gas processing device and a heat exchanger. It is a perspective view which extracts and shows the exhaust gas processing apparatus in the fuel cell apparatus of this invention. It is a perspective view which shows another example of the waste gas processing apparatus in the fuel cell apparatus of this invention. It is a perspective view which shows another example of the waste gas processing apparatus in the fuel cell apparatus of this invention.

Explanation of symbols

1: fuel cell module 2: storage container 3: fuel cell 6: reformer 18: exhaust hole 19: fuel cell device 25: exhaust gas treatment device 26: heat exchanger 30: catalyst storage case 32: combustion catalyst 33: storage Part 34: Condensed water recovery part 35, 37: Discharge part 36: Exhaust gas inflow part 38: Concave part 39: Rectification member

Claims (3)

A plurality of solid oxide fuel cells and a reformer for generating fuel gas to be supplied to the fuel cells are housed in a storage container having exhaust holes for exhausting exhaust gas. Heat for exchanging heat between the fuel cell module, the exhaust gas treatment device for treating the exhaust gas exhausted from the exhaust hole of the fuel cell module, and the treated exhaust gas and water treated by the exhaust gas treatment device A fuel cell device that supplies first reformed water generated by heat exchange in the heat exchanger to the reformer, wherein the exhaust gas treatment device includes a combustion catalyst and the combustion catalyst. A catalyst storage case for storing, the catalyst storage case having a storage portion for storing the combustion catalyst on the upper side, and in the operation stop processing of the fuel cell device on the lower side, the temperature of the exhaust gas With decline Together comprising comprises a condensed water recovery unit for recovering the second condensate occurring within the catalyst housing case, the exhaust gas treatment apparatus, as surrounded by the heat insulating material provided below the fuel cell module The heat exchanger is installed below the exhaust gas treatment device, and the catalyst storage case constituting the exhaust gas treatment device is configured to allow the exhaust gas exhausted from the fuel cell module to flow into the upper surface. A fuel cell comprising an exhaust gas inflow portion, and having a discharge portion for discharging exhaust gas that has been distributed and processed in the catalyst storage case and condensed water recovered by the condensed water recovery portion on a lower surface. apparatus. 2. The fuel cell device according to claim 1 , wherein a recess is formed in at least a part of a bottom surface of the condensed water recovery unit, and the recess and the discharge unit communicate with each other. 3. The fuel cell device according to claim 1, wherein a rectifying member for rectifying the exhaust gas flowing in from the exhaust gas inflow portion is provided in the storage portion.

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