JP2006351520A - Exhaust gas treatment device of fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas treatment device of a fuel cell capable of improving the workability of formation and assuring a dilution property. <P>SOLUTION: The exhaust gas treatment device of a fuel cell is equipped with a container 51 supplied with anode offgas and dilution gas and mixing and diluting the anode offgas with the diluting gas and includes at least one partition part 53 partially partitioning a space in the container between an anode offgas supply port 52a as well as a dilution gas supply port 58 and a mixed gas exhaust port 61 formed in the container 51, respectively. The container 51 is structured of an upper side container member 62 and a lower side container member 63. The partition part 53 is structured of an upper side partition board piece 64 and a lower side partition board piece 65. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust gas processing apparatus for a fuel cell that dilutes a gas discharged from a fuel cell.

Some fuel cells mounted on fuel cell vehicles or the like obtain electric power by electrochemical reaction of reaction gases. As this type of fuel cell, an anode and a cathode are provided on both sides of a solid polymer electrolyte membrane, a fuel gas (eg, hydrogen gas) is supplied to the anode, and an oxidant gas (eg, air containing oxygen) is supplied to the cathode. In some cases, chemical energy related to the oxidation-reduction reaction of these reaction gases is directly extracted as electric energy.
In this fuel cell, water is generated on the cathode side with power generation, and a part of this generated water permeates the solid polymer electrolyte membrane and enters the anode side. In addition, a small amount of nitrogen in the air supplied to the cathode permeates the solid polymer electrolyte membrane to the anode side and enters the hydrogen gas. These impurities such as moisture and nitrogen on the anode side may make power generation of the fuel cell unstable.

In particular, in a circulation type fuel cell system in which unreacted hydrogen (anode offgas) discharged from the fuel cell is recycled to mix with fresh hydrogen gas and supplied to the fuel cell again in order to increase the fuel utilization rate, The impurity concentration on the anode side tends to increase gradually.
Therefore, in this type of fuel cell, the anode offgas containing the impurities is discharged by periodically opening the discharge valve from the anode offgas circulation path through which the anode offgas circulates, thereby reducing the impurity concentration in the anode offgas.

When the anode off-gas discharged from the anode off-gas circulation path is discharged to the outside (atmosphere), the anode off-gas is discharged with a dilution gas (for example, air as cathode off-gas discharged from the cathode) by an exhaust gas processing device. Diluted to reduce hydrogen concentration before discharging.
Patent Document 1 discloses an example of a conventional exhaust gas processing apparatus. In this exhaust gas processing apparatus, the cathode off-gas is branched and introduced into the diluter, and the anode gas in the diluter is diluted little by little and discharged to the outside in small amounts.
JP 2002-289237 A

By the way, as also shown in Patent Document 1, when a shielding plate (partition plate) is provided in the casing constituting the diluter and the gas flow path is meandered, the volume is kept constant. This is preferable in that the gas flow path can be lengthened to improve the dilution efficiency.
However, in the conventional technology, it is difficult to provide a shielding plate at a predetermined position in the housing, and there is a problem that it takes time and effort for manufacturing. That is, when providing a shielding plate in the housing, it is desirable to perform a welding process in order to ensure strength, but conventionally, since a partition plate is inserted and welded in a state where one surface of the housing is cut out, welding is performed. It is difficult to position the partition plate. Furthermore, since it is necessary to perform the welding process in the closed space inside the housing, it takes time and effort to manufacture, and workability is reduced.
It is an object of the present invention to provide a fuel cell exhaust gas treatment device that can improve the workability of production and ensure the dilution performance.

  The invention according to claim 1 includes a container (for example, the dilution container 51 in the embodiment) that is supplied with the anode off-gas and the dilution gas and mixes and dilutes the anode off-gas with the dilution gas, and is formed in each of the containers. The anode off-gas supply port (for example, anode off-gas discharge hole 52a in the embodiment), the dilution gas supply port (for example, dilution gas discharge hole 58 in the embodiment) and the mixed gas discharge port (for example, mixed gas in the embodiment) And at least one partition part (for example, the partition part 53 in the embodiment) that partially partitions the space in the container between the discharge hole 61) and the container is a first container member (for example, The upper container member 62) in the embodiment and a second container member (for example, the lower container member 63 in the embodiment), and the partition portion is the first container. The first partition plate piece of the member (for example, the upper partition piece 64 in the embodiment) and the second partition plate piece of the second container member (for example, the lower partition piece 65 in the embodiment). Features.

  According to this invention, the partition portion can be formed in a state where the container is divided into each member by configuring the container with the first container member and the second container member, and positioning is easy. Can be done. And by forming the said partition part with the said 1st partition plate piece and the said 2nd partition plate piece, each partition piece can be individually positioned to each container member, and an attachment process can be performed. Therefore, since each partition piece can be attached from the opening surface side of each container member, even if it is a case where it fixes by the welding process advantageous in strength, the effort and time of manufacture can be reduced significantly.

The invention according to claim 2 is the invention according to claim 1, and is between the first partition piece and the first container member or between the second partition piece and the second container member. A gas flow port (for example, the notch 68 in the embodiment) is formed in at least one of the above.
According to this invention, since the contact area between the partition piece in which the gas circulation port is formed and the container member can be reduced by forming the gas circulation port, the partition piece in which the gas circulation port is formed and the Attachment work with the container member is facilitated. Even in this case, the attachment can be performed by a welding process advantageous in strength, and the rigidity can be improved.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the anode offgas supply port, the dilution gas are provided only in one of the first container member and the second container member. Each of the supply port and the mixed gas discharge port is formed, and piping (for example, the dilution gas pipe 57 and the anode off-gas introduction pipe 52 in the embodiment) connected to each of them is provided. To do.
According to this invention, since the assembling process with the other container member can be performed in a state where the pipe is disposed on any one of the container members, the container can be easily attached to the fuel cell system. be able to. Furthermore, when it is necessary to repair or inspect the pipes disposed in the container, the pipes can be easily repaired or inspected by removing the other container member without removing both container members. It can be carried out.

The invention according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the anode off-gas supply port and the dilution gas supply port are on the same side surface facing the partition (for example, It is formed on the end plate 51a) in the embodiment.
According to the present invention, the anode off gas and the dilution gas supplied from the respective supply ports change the flow direction by colliding with the partition part, and the flow velocity is reduced by colliding with the partition part. Since it diffuses at a flow rate, mixing of the supplied gases can be promoted.

According to the invention which concerns on Claim 1, workability | operativity of preparation of an exhaust gas processing apparatus can be improved, and dilution performance can be ensured.
According to the invention which concerns on Claim 2, the attachment operation | work with the said partition piece and the said container member in which the said gas distribution port was formed becomes easy.

According to the third aspect of the present invention, the container can be easily attached to the fuel cell system, and piping repair and inspection work can be easily performed.
According to the invention which concerns on Claim 4, mixing of the gas supplied can be accelerated | stimulated.

Hereinafter, an embodiment of an exhaust gas treatment device for a fuel cell according to the present invention will be described with reference to the drawings of FIGS. 1 to 5. FIG. 1 is a schematic diagram of a fuel cell system provided with the exhaust gas treatment device according to the present invention. It is a block diagram and is mounted on a fuel cell vehicle in this embodiment.
The fuel cell 1 is of a type in which a reaction gas is electrochemically reacted to obtain electric power. For example, the fuel cell 1 is formed by sandwiching a solid polymer electrolyte membrane 2 made of a solid polymer ion exchange membrane or the like between an anode 3 and a cathode 4 from both sides. A plurality of cells are stacked (only a single cell is shown in FIG. 1), hydrogen gas (reactive gas) is supplied as fuel gas to the anode 3, and oxygen (reactive gas) is used as the oxidant gas to the cathode 4. When the air containing oxygen is supplied, hydrogen ions generated by the catalytic reaction at the anode 3 pass through the solid polymer electrolyte membrane 2 to the cathode 4 and cause an electrochemical reaction with oxygen at the cathode 4 to generate electricity, Water is produced. Since part of the generated water generated on the cathode side permeates the solid polymer electrolyte membrane 2 and back diffuses to the anode side, the generated water also exists on the anode side.

  The air is pressurized to a predetermined pressure by the compressor 7 and supplied to the cathode 4 of the fuel cell 1 through the air supply path 8. After the air supplied to the fuel cell 1 is used for power generation, it is discharged from the fuel cell 1 together with the produced water on the cathode side into the air discharge passage 9 and introduced into the exhaust gas processing device 50 through the pressure control valve 10. . Hereinafter, supply air supplied to the fuel cell 1 or exhaust air discharged from the fuel cell 1 is referred to as a dilution gas.

  On the other hand, the hydrogen gas supplied from the hydrogen tank 15 flows through the hydrogen gas supply path 17, and is depressurized to a predetermined pressure by the regulator 16 on the way, controlled to a predetermined flow rate by the flow control valve 23, and passes through the ejector 19 to the fuel. Supplied to the anode 3 of the battery 1. The unreacted hydrogen gas that has not been consumed is discharged from the fuel cell 1 as an anode off-gas, sucked into the ejector 19 through the anode off-gas passage 18, and merged with fresh hydrogen gas supplied from the hydrogen tank 15. It is supplied again to the anode 3 of the fuel cell 1. That is, the anode offgas discharged from the fuel cell 1 circulates in the fuel cell 1 through the anode offgas passage 18 and the hydrogen gas supply passage 17 downstream of the ejector 19. In this embodiment, the hydrogen gas supply path 17 and the anode off-gas path 18 downstream from the ejector 19 constitute a fuel gas circulation path 20.

  An anode offgas discharge path 22 having a discharge valve 21 branches from the anode offgas path 18, and the anode offgas discharge path 22 is connected to the exhaust gas processing device 50. In the exhaust gas processing device 50, the anode off gas discharged from the anode off gas discharge path 22 is diluted by the exhaust air discharged from the air discharge path 9 and is discharged to the discharge portion via the mixed gas discharge path 30. The anode off gas may be diluted with supply air together with or instead of the discharge air.

The electric power obtained by the power generation of the fuel cell 1 is supplied to a load such as a vehicle driving motor (not shown).
The rotational speed of the compressor 7, the opening degree of the pressure control valve 10 and the flow rate control valve 23, and the opening / closing of the discharge valve 21 are controlled by an electronic control unit (hereinafter abbreviated as ECU) 40.

In the fuel cell system configured as described above, when continuously operating, the concentration of impurities (water, nitrogen, etc.) in the hydrogen gas flowing through the fuel gas circulation path 20 increases as described above. The power generation of the battery 1 may become unstable.
Therefore, in this fuel cell system, when the ECU 40 determines that the fuel cell system has been continuously operated for a certain period of time, or when it is determined that the power generation stability of the fuel cell 1 has been reduced, there is an impurity emission request. In the hydrogen gas flowing through the anode 3 of the fuel cell 1, the discharge valve 21 is opened and the anode offgas containing impurities is discharged from the anode offgas passage 18 to the exhaust gas treatment device 50 through the anode offgas discharge passage 22. The impurity concentration of the fuel cell 1 is controlled to be a predetermined value or less, and the power generation of the fuel cell 1 is maintained in a stable state.

  Next, the configuration of the exhaust gas treatment device 50 will be described in detail with reference to the drawings of FIGS. The exhaust gas processing device 50 includes a closed rectangular tube-shaped dilution container 51. The dilution container 51 is installed in the vehicle in a posture in which its axial center (in this case, the longitudinal direction of the dilution container 51 and the axis passing through the center of gravity of the end plates 51a and 51b) is substantially horizontal. The cross-sectional shape orthogonal to the axial direction has the same rectangular shape over the entire length in the axial direction.

  An anode off-gas introduction pipe 52 arranged in a horizontal posture with the shaft center slightly below the shaft center of the dilution container 51 is fixed to the end plate 51 a on one end side in the axial direction of the dilution container 51. The tip of the anode offgas introduction pipe 52 inserted into the dilution container 51 is an anode offgas discharge hole 52a. The anode off gas discharge path 22 is connected to the base end of the anode off gas introduction pipe 52, and when the discharge valve 21 is opened, the anode off gas is introduced into the dilution container 51 from the anode off gas discharge hole 52a.

Further, inside the dilution container 51, a partition 53 is erected in a substantially vertical posture in front of the tip of the anode off-gas introduction pipe 52 and substantially in the center in the axial direction of the dilution container 51. The partition 53 has a shape in which an upper portion thereof is intermittently cut out, and is in close contact with the inner surface of the dilution container 51 except for the cutout 68 and is fixed by, for example, welding. The inside of the dilution container 51 is partitioned by a partition 53 into an upstream chamber 54 that communicates with the anode off-gas introduction pipe 52 and a dilution gas discharge hole 58 described later, and a downstream chamber 55 that communicates with a mixed gas discharge hole 61 described later. An upper side of the portion 68 is a communication gas path 56 that allows the upstream chamber 54 and the downstream chamber 55 to communicate with each other.
The notch 68 of the partition 53 is located sufficiently above the axis of the dilution container 51, and the partition 53 is also present on the axial extension of the anode offgas introduction pipe 52. Therefore, as shown in FIG. 2, most of the anode offgas released from the anode offgas discharge hole 52 a is released toward the partition portion 53.

  Further, the dilution container 51 has a dilution gas pipe (dilution gas passage) 57 penetrating from the end plate 51a on one end side in the axial direction to the end plate 51b on the other end side. ) Is fixed along. The dilution gas pipe 57 also penetrates the partition part 53. The dilution gas pipe 57 is connected to the upstream end 57 a of the air discharge passage 9 and connected to the downstream end 57 b of the mixed gas discharge passage 30, and is discharged from the cathode of the fuel cell 1 to the air discharge passage 9. The exhausted air passes through the dilution gas pipe 57 and is discharged to the discharge portion through the mixed gas discharge path 30.

  In the portion of the dilution gas pipe 57 accommodated in the upstream chamber 54, a dilution gas discharge hole 58 is provided in the vicinity of the end plate 51a. The dilution gas discharge hole 58 opens at the top of the dilution gas pipe 57 and is provided at a position closer to the end plate 51 a than the anode off gas discharge hole 52 a of the anode off gas introduction pipe 52. The dilution gas discharge hole 58 discharges a part of the exhaust air flowing through the dilution gas pipe 57 to the upstream chamber 54. In this embodiment, since the dilution gas discharge hole 58 is directly provided in the dilution gas pipe 57, the dilution gas discharge hole 58 itself also serves as a communication portion between the dilution gas discharge hole 58 and the dilution gas pipe 57.

Further, in the portion of the dilution gas pipe 57 accommodated in the upstream chamber 54, a throttle portion 59 in which the opening area is reduced by denting the upper part of the dilution gas pipe 57 downstream of the dilution gas discharge hole 58. Is provided. The flow rate of exhaust air introduced from the dilution gas discharge hole 58 into the upstream chamber 54 can be adjusted according to the degree of restriction (opening area) of the restriction portion 59.
In this embodiment, the dilution gas pipe 57 is formed to have the same pipe diameter except for the throttle portion 59.

Further, on the downstream side of the throttle portion 59 in the dilution gas pipe 57, drainage holes 60 are provided in portions accommodated in the upstream chamber 54 and the downstream chamber 55, respectively. The gas is sucked into the dilution gas pipe 57 through the liquid hole 60.
In this embodiment, since the drainage hole 60 is directly provided in the dilution gas pipe 57, the drainage hole 60 itself also serves as a communication part between the drainage hole 60 and the dilution gas pipe 57.

Further, a portion of the dilution gas pipe 57 accommodated in the downstream chamber 55 is provided with a mixed gas discharge hole 61 on the downstream side of the drainage hole 60 and in the vicinity of the end plate 51b. The mixed gas discharge hole 61 opens at the top of the dilution gas pipe 57, and the gas in the downstream chamber 55 is discharged into the dilution gas pipe 57 through the mixed gas discharge hole 61.
In this embodiment, since the mixed gas discharge hole 61 is provided directly in the dilution gas pipe 57, the mixed gas discharge hole 61 itself also serves as a communication portion between the mixed gas discharge hole 61 and the dilution gas pipe 57.

The dilution container 51 includes an upper container member 62 and a lower container member 63. This will be described with reference to FIG. FIG. 3A is a perspective view of the upper container member 62, and FIG. 3B is a perspective view of the lower container member 63. As shown in the figure, each of the members 62 and 63 has a main body formed in a container shape with an open bottomed end surface, and flange portions 66 and 67 bent outward from the front end of the main body. is doing. The two members 62 and 63 are arranged facing each other so that the flange portions 66 and 67 face each other, and the flange portions 66 and 67 are welded or screwed to each other. It is integrated. A seal member may be interposed between the flange portions 66 and 67.

  An upper partition plate piece 64 is formed on the upper container member 62, and a lower partition plate piece 65 is formed on the lower container member 63 so as to protrude from each opening at the central portion in the axial direction of the dilution container 51. It is fixed by welding process. The upper partition plate piece 64 has a notch 68 formed on the upper surface thereof. Further, the respective partition plate pieces 64 and 65 are held so that the tip portions (projections from the opening portions) of the partition plates overlap with each other, and the partition portion 63 is configured by these partition plate pieces 64 and 65.

  In this way, the dilution container 51 is constituted by the upper container member 62 and the lower container member 63, and the partition portion 53 is constituted by the upper partition piece 64 and the lower partition piece 65, whereby the respective members 62, 63 are formed. The partition pieces 64 and 65 can be accurately positioned. Then, in a state in which the partition pieces 64 and 65 are positioned on the respective members 62 and 63, the partition portions 64 and 65 are partitioned into contact portions 69 and 70 from the openings of the members 62 and 63, respectively. The attachment process can be performed from both sides of the pieces 64 and 65. Therefore, even if it is fixed by a welding process that is advantageous in terms of strength, it is possible to greatly reduce the labor and time for manufacturing. Moreover, the pressure resistance strength of the dilution container 51 can be improved by fixing the members 62 and 63 and the partition pieces 64 and 65 by welding. That is, the shape necessary for the system can be taken without limiting the cross-sectional shape of the dilution container 51 to a circular shape having high pressure resistance. Furthermore, the strength of the produced partition 53 can be improved. Therefore, the length of the gas flow path in the container 51 partitioned by the partitioning portion 53 can be maintained at a certain level or more, thereby ensuring dilution performance. In the present embodiment, since the partition portion 53 is configured such that the respective leading ends of the upper partition piece 4 and the lower partition piece 65 partially overlap, the upper partition piece 64 and the lower partition piece 65 are configured. The mixed gas can be prevented from passing between the two.

  Moreover, since the notch 68 formed in the upper partition piece 64 is used as a gas circulation port, the contact area between the upper partition piece 64 and the upper container member 62 can be reduced by forming the notch 68. Accordingly, the number of parts necessary for the welding process can be reduced, so that it is easy to attach the upper partition piece 64 and the upper container member 62 while ensuring the rigidity required for the upper partition piece 64.

  Further, in the present embodiment, the dilution gas pipe 57 and the anode off-gas introduction pipe 52 are provided only in the lower container member 63, and the dilution gas discharge hole 58 and the mixed gas discharge hole 61 are provided in the dilution gas pipe 57. An anode off gas introduction hole 52 a is formed in the anode off gas introduction pipe 52. With this configuration, it is possible to perform the assembly process with the upper container member 62 in a state where the pipes 57 and 52 are disposed in the lower container member 63, so that the dilution container 51 to the fuel cell system can be assembled. Mounting can be performed easily. Further, when the pipes 57 and 52 disposed in the dilution container 51 need to be repaired or inspected, the work can be performed by removing the upper container member 62, so that handling can be facilitated. .

Next, the operation of the exhaust gas processing device 50 will be described.
In this exhaust gas processing device, exhaust air discharged from the cathode 4 of the fuel cell 1 is always supplied from the compressor 7 to the cathode 4 of the fuel cell 1. Is introduced into the dilution gas pipe 57 of the exhaust gas processing device 50 and flows through the dilution gas pipe 57 toward the mixed gas discharge path 30, and a part of the exhaust air flowing through the dilution gas pipe 57 is diluted. The gas is discharged from the gas discharge hole 58 into the upstream chamber 54.

  On the other hand, as described above, the anode off-gas is intermittently discharged from the anode off-gas passage 18 when the ECU 40 determines that there is an impurity discharge request, and is discharged intermittently from the anode off-gas passage 18. The gas is introduced into the anode off-gas introduction pipe 52 of the processing apparatus 50 and discharged into the upstream chamber 54 from the anode off-gas discharge hole 52a.

  Therefore, when the anode off gas is not released from the anode off gas discharge hole 52a to the upstream chamber 54 (that is, when the discharge valve 21 is closed), the pressure in the dilution container 51 hardly increases, but the discharge valve 21 When the anode off gas is released from the anode off gas discharge hole 52a to the upstream chamber 54, the internal pressure of the dilution container 51 increases rapidly. That is, there is a pressure change in the dilution container 51 in accordance with the anode off-gas discharge cycle.

  The partition portion 53 of the dilution container 51 in this embodiment can improve its strength, that is, pressure resistance, by fixing the members 62 and 63 and the partition pieces 64 and 65 by welding. Therefore, the dilution container 51 has extremely high mechanical strength (pressure resistance) against internal pressure and deformation (repetitive stress) caused by respiration of the dilution container, and can sufficiently withstand without any special reinforcing structure. . And since the special reinforcement structure is unnecessary, manufacture of the exhaust gas processing apparatus 50 becomes easy.

  The anode off-gas released from the anode off-gas discharge hole 52a collides with the partition 53 to change the direction of the flow, and collides with the partition 53 to reduce the flow velocity. It spreads almost throughout. As a result, the anode off-gas flows into the downstream chamber 55 through the communication gas passage 56 and flows toward the mixed gas discharge hole 61 while being partially mixed with the exhaust air in the upstream chamber 54. During this time, the mixed gas flowing in from the upstream chamber 54 and the gas in the downstream chamber 55 are further mixed. Then, the gas in the downstream chamber 55 is discharged from the mixed gas discharge hole 61 to the dilution gas pipe 57, mixed with the exhaust air flowing through the dilution gas pipe 57, further diluted and discharged.

  In this embodiment, by providing the partition portion 53, the moving distance of the gas in the dilution container 51 can be increased. Furthermore, the dilution gas discharge hole 58 is disposed in the vicinity of one end portion of the dilution container 51 in the axial direction, and the mixed gas discharge hole 61 is disposed in the vicinity of the other end portion of the dilution container 51 in the axial direction. The moving distance of the gas in 51 can be lengthened. As a result, the residence time of the gas in the dilution container 51 can be earned, and the time necessary for dilution can be secured, so that the anode off-gas can be reliably diluted.

  Further, as described above, the exhaust air introduced into the upstream chamber 54 from the dilution gas discharge hole 58 with the degree of restriction (opening area) of the throttle portion 59 provided downstream of the dilution gas discharge hole 58 in the dilution gas pipe 57. Since the flow rate can be adjusted, the flow rate of the dilution gas discharged from the dilution gas discharge hole 58 into the upstream chamber 54 is set to a predetermined value by setting the throttle condition (opening area) of the throttle portion 59 to a predetermined value. The flow rate can be set to the optimum for dilution, and the anode off gas can be sufficiently diluted and discharged.

Further, as described above, the anode off-gas introduced into the dilution container 51 contains water in a liquid or gas (vapor) state.
Further, in this embodiment, since the anode off gas is discharged from the anode off gas introduction pipe 52 toward the partition plate 53, the liquid contained in the anode off gas collides with and adheres to the partition plate 53, and the partition in the vertical posture is formed. It falls along the board 53. Further, the vapor in the anode off-gas collides with the partition plate 53 to promote condensation, and this condensate falls along the partition plate 53 in a vertical posture. That is, the partition plate 53 supplements moisture in the anode off gas and makes it easier to gather below the dilution container 51.

The liquid collected in the inner bottom portion of the dilution container 51 in this manner is sucked into the dilution gas pipe 57 from the drainage hole 60 and discharged to the mixed gas discharge path 30 together with the mixed gas.
In this embodiment, since the drainage hole 60 is provided in the lower half of the dilution gas pipe 57 and close to the inner bottom of the dilution container, the liquid accumulated at the bottom of the dilution container 51 can be easily discharged. Since the liquid remaining in the dilution container 51 without being discharged can be reduced, the drainage performance is improved.
Further, in this embodiment, since the throttle portion 59 is provided immediately upstream of the drainage hole 60, the suction force for sucking the liquid can be increased, and the liquid accumulated in the dilution container 51 is effectively sucked. be able to. Therefore, the liquid can be discharged quickly. The reason why the suction force can be increased is that the pressure is lower on the downstream side than on the upstream side of the throttle portion 59.

  Further, in this embodiment, since the dilution gas discharge hole 58, the mixed gas discharge hole 61, and the drainage hole 60 are all provided directly in the dilution gas pipe 57, the structure of the exhaust gas processing apparatus is simplified.

[Other Examples]
The present invention is not limited to the embodiment described above.
For example, in the above-described embodiment, there is only one partition, but this may be formed at a plurality of locations. For example, as in the first modification shown in FIGS. 4 and 5, partition portions 53 and 53 in which a notch portion 68 is formed in the lower container member 65 between the partition portion 53 and the end plates 51 a and 51 b. It is also possible to form a gas flow path that is arranged and folded back in three stages in the dilution container 51.

  FIG. 6 is an exploded perspective view showing a second modification of the exhaust gas treatment device. In the second modification, as in the first modification described above, three partition portions 53 are provided between the anode off-gas discharge hole 52 a and the dilution gas discharge hole 58 and the mixed gas discharge hole 61. Further, the anode off gas discharge hole 52 a, the dilution gas discharge hole 58, and the mixed gas discharge hole 61 are all provided in the lower container member 63. In the second modification, the first partition 53a closest to the anode off-gas discharge hole 52a and the dilution gas discharge hole 58 and the third partition 53c closest to the mixed gas discharge hole 61 are located above the upper partition plate piece 64. A notch 68 is formed in the upper portion. Further, in the second partition portion 53b disposed between the first partition portion 53a and the third partition portion 53c, a notch portion 68 is formed below the lower partition plate piece 65.

  In the second modification described above, the mixed gas of the anode off gas and the dilution gas introduced below the dilution container 51 flows into the cutout portion 68 above the first partition portion 53a. The mixed gas flowing out of the notch 68 above the first partition 53a flows into the notch 68 above the third partition 53c through the notch 68 below the second partition 53b. To do. Further, the mixed gas that has flowed out from the cutout portion 68 above the third partition portion 53 c is discharged from the discharge hole 61 below the dilution container 51. As described above, in the second modified example, it is possible to increase the flow distance of the mixed gas as compared with the first modified example. As a result, the mixing time of the anode off gas and the dilution gas in the dilution container 51 becomes longer, and the anode off gas can be reliably diluted.

  FIG. 7 is an exploded perspective view showing a third modification of the exhaust gas treatment device. In FIG. 7, the vertical direction of the vehicle is the Z direction, the horizontal direction in which the dilution container 51 is divided is the X direction, and the horizontal direction orthogonal to the X direction is the Y direction. In this third modification, the dilution container 51 includes a first container member 62 and a second container member 63 that are divided in the horizontal direction (X direction). Flange portions (not shown) are respectively provided at the opening edge portions of the container members 62 and 63, and both the container members 62 and 63 are integrated by being welded or screwed to the flange portions.

  An anode off gas discharge hole 52 a is provided above the + Y side surface of the first container member 62 (+ Z direction), and a dilution gas discharge hole 58 is provided above the + Y side surface of the second container member 63. The dilution gas discharge hole 58 discharges supply air (cathode supply gas) to the fuel cell or exhaust air (cathode offgas) from the fuel cell as a dilution gas. Further, a cathode air duct 57 is provided below the joint of the container members 62 and 63 (in the −Z direction). A mixed gas discharge hole 61 is provided on the upper surface in the −Y direction of the cathode air duct 57 disposed in the dilution container 51.

  In the third modification, two partition portions 53 (53a, 53b) are arranged between the anode off-gas discharge hole 52a, the dilution gas discharge hole 58, and the mixed gas discharge hole 61. Each partition 53 is configured by combining a first partition plate piece 64 provided on the first container member 62 and a second partition plate piece 65 provided on the second container member 63. In the first partition 53a closest to the anode off-gas discharge hole 52a and the dilution gas discharge hole 58, an opening 68 is provided along the end side in the −Y direction. In the second partition 53b closest to the mixed gas discharge hole 61, an opening 68 is provided along the + Y direction end. Each opening 68 is configured by combining a notch provided in the first partition plate piece 64 and a notch provided in the second partition plate piece 65.

  In the third modification described above, the mixed gas of the anode off gas and the dilution gas introduced to the + Y side of the dilution container 51 flows into the −Y side opening 68 of the first partition 53a. The mixed gas flowing out from the −Y side opening 68 of the first partition 53a flows into the + Y side opening 68 of the second partition 53b. Further, the mixed gas flowing out from the + Y side opening 68 of the second partition 53b is discharged from the −Y side discharge hole 61 of the cathode air duct. As described above, also in the third modification, the flow distance of the mixed gas can be increased, and the anode off-gas can be reliably diluted. Moreover, in the third modification, the first container member and the second container member are joined so as to sandwich the cathode air duct 57, so that the cathode air duct 57 can be easily attached.

In the above-described embodiment, the cross section of the dilution container is rectangular, but it may be oval or circular. Here, it is preferable that the cross-sectional shape orthogonal to the axial direction of the dilution container is a curved line (ellipse) that protrudes outward along the entire circumference of the closed cross section, because the pressure resistance can be further improved. However, it is not limited to this shape. Thus, since the shape of a dilution container is not limited, layout property can be improved.
In the above-described embodiments, exhaust air (cathode off-gas) discharged from the cathode of the fuel cell is used as the dilution gas. However, the dilution gas is not limited to this, and supply air (cathode supply gas) may be used. Good.
The anode off gas supply port, the dilution gas supply port, and the mixed gas discharge port may be formed in the container or on the surface of the container.

It is a schematic block diagram of the fuel cell system provided with the exhaust gas processing apparatus which concerns on this invention. It is a perspective view of the exhaust gas processing apparatus in an Example. It is a disassembled perspective view of the said exhaust gas processing apparatus. It is a principal part perspective view which shows the 1st modification of the said exhaust gas processing apparatus of FIG. It is a disassembled perspective view of the said exhaust gas processing apparatus in the 1st modification shown in FIG. It is a disassembled perspective view which shows the 2nd modification of the said exhaust gas processing apparatus. It is a disassembled perspective view which shows the 3rd modification of the said exhaust gas processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fuel cell 3 ... Anode 50 ... Exhaust gas processing apparatus 51 ... Dilution container 51a ... End plate (side surface) 52 ... Anode off-gas introduction pipe (pipe) 53 ... Partition part 57 ... Dilution gas pipe (pipe) 58 ... Dilution gas discharge | release Hole (dilution gas supply port) 61 ... Mixed gas discharge hole (mixed gas discharge port) 62 ... Upper container member (first container member) 63 ... Lower container member (second container member) 64 ... Upper partition piece (first Partition plate piece) 65 ... Lower partition piece (second partition plate piece) 68 ... Notch (gas flow port)

Claims (4)

An anode off gas and a dilution gas are supplied, and a container for mixing and diluting the anode off gas with the dilution gas is provided.
Between the anode off-gas supply port and the dilution gas supply port formed in the container, and the mixed gas discharge port, at least one partition part for partially partitioning the inner space of the container,
The container is composed of a first container member and a second container member,
The partition part is composed of a first partition plate piece of a first container member and a second partition plate piece of a second container member, and an exhaust gas processing apparatus for a fuel cell, characterized in that:   A gas circulation port is formed between at least one of the first partition piece and the first container member or between the second partition piece and the second container member. The exhaust gas treatment device for a fuel cell according to claim 1. Only on either the first container member or the second container member,
3. The anode off gas supply port, the dilution gas supply port, and the mixed gas discharge port are formed, and piping connected to each of them is provided. The fuel cell exhaust gas treatment apparatus described.   The exhaust gas treatment for a fuel cell according to any one of claims 1 to 3, wherein the anode off gas supply port and the dilution gas supply port are formed on the same side surface facing the partition portion. apparatus.

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