JP2007179894A - Exhaust gas dilution device of fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas dilution device of a fuel cell of which dilution performance of hydrogen gas can be exhibited more stably at a higher level. <P>SOLUTION: Exhaust hydrogen gas from an anode electrode side is introduced to a storing body 10 via an introduction part 22 and the hydrogen gas is delivered into a cathode side exhaust pipe 32 from a lead-out part 42. In the storing body 10, a blocking members 44, 46 with blocking surfaces 48, 50 for blocking a flow of the hydrogen gas are alternately erected on mutually facing two inner surface parts out of inner surface parts of the storing body 10 in a direction of the hydrogen gas flow. A notch part 58 is provided at the blocking member 44 which is most proximal to the lead-out part 42. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel cell exhaust gas dilution device, and more particularly, to a fuel cell exhaust gas for diluting hydrogen gas discharged from the anode electrode side with air discharged from the cathode electrode side and discharging it to the atmosphere. It relates to an improved structure of the dilution device.

  In recent years, fuel cells that are environmentally friendly and have high power generation efficiency have attracted attention and attempts have been made to use them for various purposes. For example, a fuel cell vehicle using such a fuel cell as a drive source is expected as a next-generation vehicle, and a movement toward practical use is in full swing.

  By the way, as is well known, for example, in a fuel cell system using pure hydrogen (hereinafter referred to as hydrogen) as a fuel mounted on a fuel cell vehicle or the like, it is often discharged from the anode electrode side. A circulation device for supplying a gas containing unused hydrogen to the anode electrode side again is provided to improve the utilization efficiency of fuel hydrogen. However, if circulation of the exhaust gas from the anode electrode side by the circulation device is continued for a long time, impurities such as nitrogen and generated water generated during power generation increase in the exhaust gas. A decrease in efficiency is inevitably caused.

  Therefore, in such a fuel cell system, the purge operation is intermittently performed, and the exhaust gas with increased impurities is periodically discharged into the atmosphere. Since the exhaust gas to be discharged contains high-concentration hydrogen gas, when discharging such exhaust gas to the atmosphere, the hydrogen gas contained in the exhaust gas is diluted to a level that does not cause a safety problem. There was a need to do.

  Under such circumstances, an exhaust gas dilution device (exhaust hydrogen treatment device) for a fuel cell in which hydrogen gas discharged from the anode electrode side is diluted with air discharged from the cathode electrode side and discharged into the atmosphere. Is proposed in the following Patent Document 1 and the like. This apparatus includes a container (hydrogen diluter) to which a hydrogen gas discharge pipe discharged from the anode electrode side is connected and which can store the hydrogen gas. In addition, a branch pipe branched from the upstream side portion of the air discharge pipe for discharging the air discharged from the cathode electrode side to the atmosphere is connected to the container, and further, the gas in the container is discharged to the outside. A discharge flow path is connected to communicate the container and the downstream portion of the air discharge pipe. That is, it is set as the structure by which a container is provided in the middle of the bypass flow path provided in the air exhaust pipe.

  In such an exhaust gas diluting device, hydrogen gas discharged from the anode electrode side is introduced into the container, and part of the air discharged from the cathode electrode side is taken in, so that the hydrogen gas is discharged. The gas is allowed to mix with air in the containment. Then, such a mixed gas of hydrogen gas and air is led into the air discharge pipe through the discharge flow path so that the hydrogen gas can be diluted to a safe concentration with the air in the air discharge flow pipe. It is configured.

  Further, in such an exhaust gas dilution device, the plurality of shielding plates having shielding surfaces that block the flow of hydrogen gas are opposed to each other with a predetermined distance in the flow direction of the hydrogen gas in the container, and are opposed to each other. Zigzag gas flow paths are formed in the container so that the shielding plates are separately provided with respect to one and the other of the two inner surfaces facing each other in a direction perpendicular to the direction of hydrogen gas flow. Is formed. As a result, the hydrogen gas introduced into the container at a predetermined flow rate based on the purge pressure is allowed to flow through the zigzag flow path while colliding with the shielding plate and slowing down the flow rate. And the air present in the container are mixed more sufficiently, and the hydrogen gas and air mixed gas are devised so that they can be led out as little as possible from the discharge flow path into the air discharge pipe. ing. As a result, the concentration of hydrogen gas is efficiently reduced, and the dilution performance is improved.

  However, in such a conventional exhaust gas diluting device, in the arrangement form of the shielding plate, the space formed between the shielding plates facing each other in the flowing direction of the hydrogen gas in the container, or the exhaust flow path In the space located on the downstream side in the hydrogen gas flow direction with respect to the most proximal shielding plate, the hydrogen gas is difficult to flow into the portion in contact with the surface opposite to the shielding surface of the shielding plate or in the vicinity of the surface. However, there is a drawback that these portions are difficult to be used as a mixed space of hydrogen gas and air, and are easily a so-called dead space. In particular, when there is a large dead space in the downstream space in the hydrogen gas flow direction with respect to the shielding member closest to the discharge flow path, the hydrogen gas is led out from the discharge flow path into the air discharge pipe. Previously, it was difficult to uniformly mix with the air in the container, and as a result, the dilution performance of hydrogen gas could become unstable.

  In Patent Document 2 below, a large number of through holes are formed in a shielding plate (partition plate) that forms a zigzag channel in the container, and hydrogen gas introduced into the container is passed through the zigzag channel. In addition, it has been clarified that the hydrogen gas and the air can be sufficiently mixed in the entire container by flowing along the through holes and through the through holes. However, when the flow of hydrogen gas is blocked by the shielding plate having a large number of through holes as described above, the pressure loss of the flow of hydrogen gas becomes enormous. A new problem will be caused that hinders the smooth outflow of hydrogen gas into the discharge pipe.

JP 2002-289237 A Japanese Patent Laid-Open No. 2004-6183

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the hydrogen gas discharged from the anode electrode side is the air discharged from the cathode electrode side. In the exhaust gas diluting device for a fuel cell that is diluted in the above, the air and hydrogen gas existing in the containing body are mixed sufficiently and efficiently in the whole containing body of the hydrogen gas. It is an object of the present invention to provide a novel structure that can be diluted with air exhausted from the cathode electrode side, so that more excellent hydrogen gas dilution performance can be exhibited more stably. .

  In the present invention, in order to solve such problems, the gist of the present invention is that a container capable of storing hydrogen gas discharged from the anode electrode side, and an introduction portion provided in the container. And introducing the hydrogen gas into the accommodating body through the introduction portion, while the air discharged from the cathode electrode side is circulated through the discharge port provided at the one end portion. The hydrogen gas accommodated in the container is led out through the lead-out section into the air circulation pipe that discharges the air into the atmosphere, and mixed with the air in the air circulation pipe, In the exhaust gas diluting device for a fuel cell, wherein hydrogen gas is diluted with the air and discharged into the atmosphere, the flow of the hydrogen gas circulated in the housing from the introduction portion toward the lead-out portion Shielding surface The plurality of shielding members provided are opposed to each other at a predetermined distance in the hydrogen gas flow direction in the housing body, and one of the mutually facing shield members is defined as the hydrogen gas flow direction. One of the two inner surface portions of the containing body that are opposed to each other in the intersecting direction is erected so as to extend toward the other inner surface portion, while the other shield. A member is erected so as to extend toward the one inner surface portion with respect to the other inner surface portion, and among the plurality of shielding members, at least a shielding member closest to the lead-out portion On the other hand, an exhaust gas dilution device for a fuel cell is provided with a notch extending from the tip portion toward the base side by a predetermined length.

  That is, in the exhaust gas dilution device for a fuel cell according to the present invention, a zigzag gas flow path is formed in the housing body by the plurality of shielding members. As a result, the hydrogen gas introduced into the container is allowed to flow through the zigzag flow path while colliding with the shielding plate while reducing the flow velocity, and is sufficiently mixed with air in the flow path. Through the lead-out part, it can be led out little by little into the air exhaust pipe.

  In the device of the present invention, in particular, at least the shielding member closest to the lead-out portion is provided with a notch portion extending from the tip portion toward the base side by a predetermined length, so that the zigzag gas is provided. Part of the hydrogen gas circulated through the flow path passes over the tip of the shielding member closest to the lead-out part and is circulated to the lead-out part side, while the remaining hydrogen gas passes through the notch part. And distributed to the derivation unit side. At this time, the hydrogen gas that has passed through the notch does not cause a large pressure loss, and a space portion that is in contact with the surface opposite to the shielding surface of the shielding member closest to the lead-out portion, a space portion in the vicinity of the surface, etc. In the conventional apparatus, the dead space can be smoothly flowed into the dead space, and the dead space can be advantageously eliminated or reduced. As a result, the entire portion of the container located downstream of the shielding member closest to the lead-out portion in the hydrogen gas flow direction can be sufficiently utilized as a mixed space of hydrogen gas and air. Thus, hydrogen gas and air can be sufficiently and uniformly mixed in the downstream portion.

  Therefore, in the exhaust gas dilution device for a fuel cell according to the present invention as described above, the hydrogen gas introduced into the housing body is more sufficiently and efficient than the air present in the housing body in the entire interior of the housing body. After being mixed, it is smoothly led out into the air circulation pipe, where it can be mixed with the air in the air circulation pipe and diluted. As a result, the dilution rate of hydrogen gas can be more sufficiently and stably lowered, and therefore, more excellent hydrogen gas dilution performance can be exhibited even more stably. .

  Further, in the device of the present invention, unlike a conventional device in which a dead space that is difficult or impossible to use as a mixed space of hydrogen gas and air is inevitably formed in the container, such a dead space disappears or disappears. Since the entire interior of the container can be effectively used as a mixed space of hydrogen gas and air, the size of the container, and thus the entire apparatus, can be reduced compared to conventional devices. It can be realized very advantageously without impairing the dilution performance.

Aspects of the Invention

  By the way, the present invention can be suitably implemented at least in various aspects as listed below.

(1) It has a container capable of storing hydrogen gas discharged from the anode electrode side, and an introduction part and a lead-out part provided in the container, and the hydrogen gas is introduced into the container through the introduction part. On the other hand, the air exhausted from the cathode electrode side is circulated through the inside, and is accommodated in the accommodating body in an air circulation conduit that exhausts the air to the atmosphere from an exhaust port provided at one end. A fuel cell in which the hydrogen gas is led out through the lead-out portion and mixed with the air in the air circulation pipe so that the hydrogen gas is diluted with the air and discharged into the atmosphere. In the exhaust gas diluting apparatus, a plurality of shielding members having shielding surfaces that block the flow of the hydrogen gas that is circulated in the housing body from the introduction portion toward the lead-out portion are disposed in the housing body. In the distribution direction of Of the two inner surface portions of the container that are positioned opposite to each other at a constant distance and one of the opposing shielding members is positioned to face each other in a direction crossing the flow direction of the hydrogen gas. One of the inner surface portions is erected so as to extend toward the other inner surface portion, while the other shielding member is directed toward the one inner surface portion with respect to the other inner surface portion. Further, among the plurality of shielding members, at least a shielding member closest to the lead-out portion is provided with a notch portion extending a predetermined length from the tip portion toward the base side. An exhaust gas dilution device for a fuel cell.

(2) In the aspect (1) described above, a space formed between the shielding members facing each other on the downstream side in the hydrogen gas flow direction than the shielding member closest to the lead-out portion in the container. A space having a large volume is formed. According to this aspect, the hydrogen gas circulated in the zigzag gas flow path is in a large volume space provided on the downstream side in the hydrogen gas flow direction from the shielding member closest to the lead-out portion. Can be effectively diffused and more evenly mixed with the air in the containment and then led into the air flow conduit. As a result, the dilution rate of hydrogen gas can be more stably reduced.

(3) In said aspect (1) or aspect (2), with respect to the shielding member nearest to the said derivation | leading-out part, while the said notch part is provided with two or more, these notch parts are the distribution | circulation of the said hydrogen gas Being positioned side by side in a direction perpendicular to the direction. According to this aspect, the hydrogen gas circulated in the zigzag gas flow path collides with portions located between the adjacent notches in the shielding member closest to the lead-out portion, and these It will be possible to pass through the adjacent notches. At this time, a number of small vortexes of hydrogen gas are formed on the side opposite to the shielding surface of the shielding member, whereby hydrogen gas diffusion and mixing with air can be performed more efficiently and sufficiently. . As a result, the hydrogen gas dilution performance can be further effectively improved.

(4) In any one of the modes (1) to (3) described above, the total opening area of the notch portion provided in the shielding member closest to the lead-out portion is the shielding member. It is set to a value that is 10% or more and less than 30% with respect to the area of the shielding surface. According to this embodiment, the dilution rate of hydrogen gas can be more sufficiently and stably reduced.

(5) In any one of the modes (1) to (4) described above, the shielding member includes an inner surface portion facing the tip surface of the tip surface and the two inner surfaces. Is formed so as to form a through-hole allowing the flow of the hydrogen gas circulated from the introduction portion toward the lead-out portion, and the flow of the hydrogen gas is other than the through-hole. In this case, it is shielded by the shielding member. According to this aspect, the hydrogen gas can be reliably circulated in the zigzag gas flow path formed in the housing body by the plurality of shielding members, and thereby the hydrogen gas in the gas flow path Mixing with air can be performed more efficiently and sufficiently.

(6) In any one of the modes (1) to (5) described above, of the plurality of shielding members, the shielding member closest to the introduction part is the introduction member in the container. It is positioned with the shielding surface facing the part forming portion. According to this aspect, the flow of hydrogen gas introduced into the container through the introducing portion is more reliably blocked by the shielding surface of the shielding member closest to the introducing portion, whereby the hydrogen gas is It can be mixed more thoroughly with the air in the container.

(7) In any one of the above aspects (1) to (6), the two inner surface portions of the container are an upper inner surface portion and a lower inner surface portion that are opposed to each other in the vertical direction. The plurality of shielding members are respectively provided upright with respect to the upper inner surface portion and the lower inner surface portion. In this embodiment, the gas flow path is formed in the container so as to extend in the zigzag shape in the vertical direction by the plurality of shielding members, and along this, the hydrogen gas flows in the zigzag shape in the vertical direction. You will be tempted. Therefore, for example, a plurality of shielding members are erected on the two side portions opposed to each other in the horizontal direction, so that the inside of the gas passage formed in the container so as to extend in the zigzag shape in the horizontal direction. Unlike the case where the hydrogen gas introduced into the container at a small flow rate or flow rate is circulated only in the upper part of the gas flow path (container) due to its low specific gravity, it is introduced into the container. Even when the flow rate or flow rate of the generated hydrogen gas is small, the hydrogen gas can be forcedly and effectively circulated throughout the gas flow path. As a result, hydrogen gas and air can be mixed more sufficiently in the gas flow path.

(8) In any one of the above-described modes (1) to (7), the container includes a first side inner surface portion and a second side inner surface that are opposed to each other in the horizontal direction. And the air flow pipe has a divided structure that is divided into an upstream pipe and a downstream pipe located on the upstream side and the downstream side in the air flow direction, respectively. And the upstream pipe line penetrates the lower part of the inner surface portion of the first side portion at the downstream end portion thereof, enters the containing body, and is located in the containing body. The opening at the front end of the side conduit opens toward the connection hole at a position where a predetermined gap is formed between the inner surface of the second side and the connection hole formed through the lower part. While the downstream pipe line communicates with the container. The air that is connected to the connection hole in the inner surface portion of the second side portion and circulates in the air circulation pipe line enters the downstream pipe line from the tip opening of the upstream pipe line. And the lead-out portion is constituted by the gap formed between the tip opening of the upstream side pipe line and the connection hole of the inner surface portion of the second side portion. Then, the hydrogen gas accommodated in the accommodating body is mixed into the air blown out from the front end opening of the upstream pipeline toward the downstream pipeline through the outlet. It has become.

  In this embodiment, for example, a bypass channel is provided in the air circulation pipe, and unlike the case where a container is provided in the middle of the bypass channel, such a bypass channel is not interposed. The air circulation pipe and the container are directly connected, and the mixed gas of hydrogen gas and air mixed in the container is led out from the lead-out section into the air circulation pipe. Can be diluted with air. Therefore, the reduction in the number of parts accompanying the omission of the bypass channel and the compactness of the entire apparatus can be effectively achieved.

(9) In the above aspect (8), the shielding member is erected with respect to the lower inner surface portion of the container, and the liquid flows through the lower end portion of the shielding member erected on the lower inner surface portion. Possible through-holes are provided. According to this aspect, the generated water discharged from the anode electrode side and introduced into the housing body smoothly flows toward the outlet portion side through the through hole of the shielding member standing on the lower inner surface portion. Can be. Therefore, it can be advantageously avoided that the flow of the generated water is obstructed by the shielding member standing on the lower inner surface portion, and the storage and freezing of the generated water in the container are more effective. Can be prevented.

  Hereinafter, in order to clarify the present invention more specifically, an embodiment of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 to FIG. 3 schematically show one embodiment of an exhaust gas dilution device for a fuel cell mounted on a fuel cell vehicle having a structure according to the present invention in different cross-sectional configurations. Yes. As is clear from these drawings, the exhaust gas dilution device of the fuel cell according to the present embodiment has a metal or resin container 10 having a substantially rectangular tube shape with bottoms on both sides as a whole. .

  More specifically, the container 10 has a cylindrical wall portion 11 that extends in the front-rear direction of the vehicle (the left-right direction in FIGS. 1 and 2) when mounted on the fuel cell vehicle. The cylindrical wall portion 11 has a substantially rectangular tube shape as a whole, and includes upper and lower wall portions 12 and 13 opposed to each other in the vertical direction, and left and right wall portions 14 and 15 opposed to each other in the horizontal direction. It is made up. And the front side opening part (left side opening part in FIG.1 and FIG.2) and rear side opening part (right side opening part in FIG.1 and FIG.2) of such a cylinder wall part 11 are front and back bottom walls. The parts 16 and 17 are respectively closed.

  Thus, the container 10 is configured by a substantially rectangular casing integrally including the cylindrical wall portion 11 and the front and rear bottom wall portions 16 and 17, and the interior thereof is above the cylindrical wall portion 11 and The housing space 18 is surrounded by the lower side wall portions 12 and 13, the left and right side wall portions 14 and 15, and the front and rear bottom wall portions 16 and 17 and is sealed from the outside and has a sufficiently large volume. Yes. Further, in the container 10, the inner surfaces of the upper and lower side wall portions 12, 13 and the left and right side wall portions 14, 15 and the front and rear bottom wall portions 16, 17 constituting the inner surface of the accommodating space 18, It is a flat surface without unevenness. Hereinafter, in order to facilitate understanding of the structure of the exhaust gas dilution apparatus according to the present embodiment, for convenience, the front bottom wall portion 16 side is referred to as the front side, and the rear bottom wall portion 17 side. Is referred to as the rear side.

  In the container 10, the gas inlet 22 that penetrates the front bottom wall portion 16 is provided in the upper right portion of the front bottom wall portion 16 so as to have a small-diameter circular shape. Further, an insertion hole 24 penetrating through the lower left portion of the front bottom wall portion 16 is formed with a large-diameter circular shape.

  On the other hand, in the lower left portion of the rear bottom wall portion 17 of the container 10, the position corresponding to the formation position of the insertion hole 24 in the front bottom wall portion 16 in the front-rear direction is substantially the same as that of the insertion hole 24. A circular gas outlet 26 having a larger diameter is formed so as to penetrate the rear bottom wall portion 17 coaxially with the insertion hole 24. Further, the gas discharge port 26 is disposed at a position opening in the accommodation space 18 on the lowermost side of the inner surface of the rear bottom wall portion 17. Accordingly, the lower inner peripheral surface portion 28 located on the lowermost side of the inner peripheral surface of the gas discharge port 26 is flush with the inner surface formed by the plane of the lower side wall portion 13 in the container 10. That is, the lower inner peripheral surface portion 28 of the gas discharge port 26 and the inner lower bottom surface 20 of the container 10 are continuous surfaces having no step.

  An anode exhaust pipe 30 extending from the anode electrode side of the fuel cell (not shown) is connected to the gas inlet 22 provided in the front bottom wall portion 16 of the container 10. As a result, the entire amount of hydrogen gas intermittently discharged by the purge operation from the anode electrode side of the fuel cell is introduced into the accommodating space 18 of the accommodating body 10 through the gas inlet 22. As is apparent from this, the introduction part is configured at the gas introduction port 22 here.

  In addition, in the container 10, air that extends from the cathode electrode side of a fuel cell (not shown) and is discharged from the cathode is always circulated at a flow rate sufficiently higher than hydrogen gas discharged from the anode electrode side. The cathode side exhaust pipe 32 is connected in a state of being inserted through the insertion hole 24 provided in the front bottom wall portion 16 and the gas discharge port 26 provided in the rear bottom wall portion 17.

  That is, here, the cathode side exhaust pipe 32 constitutes an upstream side portion in the air flow direction, and constitutes an upstream side exhaust pipe 34 connected to the cathode electrode side of the fuel cell at one end portion and a downstream side portion thereof. And it has the division | segmentation structure which consists of the downstream exhaust pipe 36 opened to air | atmosphere in one end part. Further, the downstream side exhaust pipe 36 has an inner diameter that is larger than the inner diameter of the upstream side exhaust pipe 34 by a predetermined dimension and is the same size as the diameter of the gas exhaust port 26.

  The downstream exhaust pipe 36 of the cathode side exhaust pipe 32 is in contact with the outer surface of the rear bottom wall portion 17 at the end face on one side in the axial direction with the exhaust pipe 36 positioned coaxially with respect to the gas discharge port 26. It is squeezed and fixed. Thereby, the downstream exhaust pipe 36 is connected to the gas outlet 26 so as to communicate the housing space 18 in the housing body 10 to the atmosphere. In addition, under such a connection state of the downstream exhaust pipe 36 to the gas exhaust port 26, the inner peripheral surfaces of the downstream exhaust pipe 36 and the gas exhaust port 26 are continuous surfaces having no step over the entire circumference. Therefore, among the inner peripheral surface of the downstream side exhaust pipe 36, the lowermost inner peripheral surface portion 38 and the inner lower bottom surface 20 of the container 10 are also located in the lower portion of the gas exhaust port 26. It is a continuous surface with no step through the peripheral surface portion 28.

  Further, the upstream side exhaust pipe 34 of the cathode side exhaust pipe 32 is inserted through the insertion hole 24 at the distal end portion on the downstream side in the air circulation direction, and is inserted into the accommodation space 18. The portion of the upstream exhaust pipe 34 that enters the housing space 18 extends straight toward the gas outlet 26 on the same axis. As a result, the front end opening 40 of the upstream side exhaust pipe 34 is opened toward the gas exhaust port 26 and the downstream side exhaust pipe 36 connected thereto, and thus flows through the upstream side exhaust pipe 34. The squeezed air is always blown out straight from the front end opening 40 toward the gas outlet 26 and the downstream exhaust pipe 36.

  Further, in such an upstream side exhaust pipe 34, a portion that enters into the accommodating space 18 has a lower portion of the outer peripheral surface thereof in contact with the inner lower bottom surface 20 of the accommodating body 10, and a tip end surface thereof, The housing space 18 is disposed in a state of being positioned at a predetermined distance from the rear bottom wall portion 17 to the front bottom wall portion 16 side. Accordingly, the air blown from the front end opening 40 toward the gas exhaust port 26 between the front end opening 40 and the gas exhaust port 26 of the upstream side exhaust pipe 34 on the lower side in the accommodation space 18. A gap 42 serving as a path is formed with a predetermined length.

  Thus, in the exhaust gas dilution device of the present embodiment, the exhaust air from the cathode electrode side that circulates in the upstream exhaust pipe 34 of the cathode side exhaust pipe 32 flows from the tip opening 40 of the upstream exhaust pipe 34. The gas flows into the gas discharge port 26 via the gap 42 and is further discharged into the atmosphere through the downstream exhaust pipe 36 connected to the gas discharge port 26.

  On the other hand, the hydrogen gas intermittently introduced from the gas inlet 22 into the accommodating space 18 through the anode-side exhaust pipe 30 by the purge operation is directed toward the gas outlet 26 and the gap 42 by the purge pressure. In the gap 42, the air is blown into the air blown from the upstream side exhaust pipe 34 of the cathode side exhaust pipe 32 toward the downstream side exhaust pipe 36. Has been. Furthermore, since the inside of the gap 42 is set to a pressure lower than that of the accommodation space 18 other than the gap 42 due to the flow of air, the hydrogen gas existing in the accommodation space 18 remains even after the purge pressure becomes zero. , And is sucked into the gap 42.

  Thus, in the present embodiment, the entire amount of hydrogen gas introduced into the accommodation space 18 is led into the cathode side exhaust pipe 32 by being caused to flow into the gap 42, thereby causing the cathode side exhaust gas to flow out. The hydrogen gas mixed in the air flowing through the pipe 32 is diluted with the air, and the diluted hydrogen gas is mixed with the air through the end opening of the downstream side exhaust pipe 36 in the cathode side exhaust pipe 32. It can be discharged inside.

  As is clear from these facts, in the present embodiment, the lead-out portion is configured by the gap 42. Further, the cathode side exhaust pipe 32 constitutes an air circulation pipe line, and the upstream side exhaust pipe 34 and the downstream side exhaust pipe 36 constitute an upstream side pipe line and a downstream side pipe line, respectively. Has been. Furthermore, the front and rear bottom wall portions 16 and 17 constitute first and second side portions, and the gas discharge port 26 constitutes a connection hole.

  Here, the produced water discharged from the anode electrode side together with the hydrogen gas is introduced into the containing body 10 through the anode side exhaust pipe 30, and the produced water introduced into the containing body 10 is hydrogen. After being introduced into the gap 42 by the gas flow and blown away by the air flowing in the gap 42, the gas is introduced into the downstream exhaust pipe 36 of the cathode side exhaust pipe 32, and then air or hydrogen It will be discharged into the atmosphere along with the gas. Moreover, in the present embodiment, the inner lower bottom surface 20 which is the inner surface of the lower side wall portion 13 of the container 10, the lower inner peripheral surface portion 28 of the gas exhaust port 26, and the lower inner peripheral surface portion 38 of the downstream exhaust pipe 36 are surfaces. Since the continuous surface is continuous and has no step, the generated water falling on the inner lower bottom surface 20 can be more smoothly guided into the downstream exhaust pipe 36 and discharged into the atmosphere. ing. If such a container 10 is mounted on a fuel cell vehicle in a state where the container 10 is inclined such that the gas discharge port 26 side is lower than the gas introduction port 22 side, the container 10 falls to the inner lower bottom surface 20. The generated water is more smoothly guided into the downstream exhaust pipe 36 and discharged into the atmosphere.

  By the way, in the exhaust gas dilution device of this embodiment, the hydrogen gas introduced into the accommodation space 18 through the gas introduction port 22 is caused to flow in a zigzag manner in the front portion of the accommodation space 18 in the accommodation body 10. A gas flow path 43 is formed.

  That is, here, the first shielding plate 44 and the second shielding plate 46 are disposed on the front side in the housing 10 as shielding members that block the flow of hydrogen gas. These first and second shielding plates 44 and 46 are both the same width as the width of the cylindrical wall portion 11 in the container 10 (the distance between the left side wall portion 14 and the right side wall portion 15 of the cylindrical wall portion 11). And a rectangular thin flat plate shape having a height lower than the height of the cylindrical wall portion 11 (distance between the upper side wall portion 12 and the lower side wall portion 13) and higher than a half height thereof by a predetermined dimension, One surface in the thickness direction is the flat shielding surfaces 48 and 50.

  The first shielding plate 44 has a shielding surface 48 at a predetermined distance from the inner surface of the front bottom wall portion 16 at a substantially central portion in the front-rear direction of the container 10 or a portion on the front side of the central portion. The upper side exhaust pipe 34 of the cathode side exhaust pipe 32 is inserted into a through hole 49 provided at the lower end and is opposed to the inner surface of the lower wall part 13 of the cylindrical wall part 11. It is erected integrally so as to extend vertically toward the side wall portion 12.

  Further, in the first shielding plate 44, the left and right end faces are brought into contact with and integrated with the inner surface of the left wall portion 14 and the inner surface of the right wall portion 15 of the cylindrical wall portion 11. On the other hand, the upper end surface is opposed to the inner surface of the upper side wall portion 12 with a predetermined distance. As a result, a rectangular first through hole 52 is formed between the upper end surface of the first shielding plate 44 and the inner surface of the upper side wall portion 12, and the front portion and the rear side of the housing space 18 relative to the first shielding plate 44 are formed. The side portion can be communicated with the first through hole 52.

  Further, a plurality of through holes 56 are provided at the lower end of the first shielding plate 44. Thereby, the generated water that has been introduced into the accommodation space 18 together with the hydrogen gas and dropped onto the inner lower bottom surface 20 of the lower side wall portion 13 on which the first shielding plate 44 is erected is generated by the first shielding plate 44. Without being dammed, the fluid can smoothly flow through the plurality of through holes 56 toward the gap 42 and further into the downstream exhaust pipe 36.

  On the other hand, the second shielding plate 46 is arranged so that the shielding surface 50 is opposed to the upper portion of the front bottom wall portion 16 including the portion where the gas introduction port 22 is formed, in front of the first shielding plate 44. In other words, the opening into the accommodation space 18 of the anode side exhaust pipe 30 connected to the gas inlet 22 of the front bottom wall portion 16 is positioned so as to be covered from the rear bottom wall portion 17 side. In this state, the cylindrical wall portion 11 is integrally provided on the inner surface of the upper wall portion 12 so as to extend vertically toward the lower wall portion 13.

  Further, in the second shielding plate 46, the left and right end faces are brought into contact with the inner surface of the left wall portion 14 and the inner surface of the right wall portion 15 of the cylindrical wall portion 11 so as to be integrated. On the other hand, the lower end surface is opposed to the inner surface (inner lower bottom surface 20) of the lower side wall portion 13 with a predetermined distance therebetween. Accordingly, a rectangular second through hole 54 is formed between the lower end surface of the second shielding plate 46 and the inner surface of the lower side wall portion 13, and the first shielding plate 44 and the second shielding plate 46 in the accommodation space 18 are formed. A portion between the second shield plate 46 and the front portion of the second shielding plate 46 is communicated with each other through the second through hole 54.

  Thus, the gas flow path 43 for allowing the hydrogen gas introduced into the accommodation space 18 through the gas introduction port 22 to flow in a portion in front of the central portion in the front-rear direction of the accommodation space 18 includes the first shielding plate 44 and the second shielding plate 44. The hydrogen gas is formed by the shielding plate 46, and the hydrogen gas flows in the gas passage 43 between the front bottom wall portion 16 and the second shielding plate 46, the second through hole 54, By allowing the rear flow path portion 43b between the second shielding plate 46 and the first shielding plate 44 and the first through hole 52 to flow in order, the above-described operation is performed while flowing in a zigzag shape in the vertical direction. It is guided to the gap 42 and the gas outlet 26 side.

  Here, in particular, the first shielding plate 44 located closest to the rear side, that is, the gas discharge port 26, among the first and second shielding plates 44 and 46 forming such a gas flow path 43. On the other hand, five long rectangular cutouts 58 are provided.

  That is, each of the five notches 58 has a width of about 1/11 of the width of the first shielding plate 44 and a length of about half of the height of the first shielding plate 44. It has a long rectangular shape of the same size. Then, the notch portions 58 are provided at five locations spaced apart from each other in the width direction at the upper portion of the first shielding plate 44 by the lower wall portion from the tip on the upper wall portion 12 side in the cylindrical wall portion 11 of the container 10. Each of them is formed so as to extend straight toward the base portion on the 13th side. Here, since each of the five notches 58 has the size as described above, the total opening area of the five notches 58 is equal to the shielding surface 48 of the first shielding plate 44. The value is over 20%.

  On the other hand, the rear portion of the accommodation space 18 in which such a gas flow path 43 is formed in the front portion is a hydrogen gas except that the upstream exhaust pipe 34 is disposed on the inner lower bottom surface 20 of the lower wall portion 13. It is a space where there are no shields that block the flow of gas. Further, as described above, of the two shielding plates 44 and 46 forming the gas flow path 43, the first shielding plate 44 disposed on the rear side is substantially at the central portion in the front-rear direction of the accommodating space 18 or from the central portion. Also, the volume of the rear portion of the accommodation space 18 relative to the gas flow path 43 is larger than the volume of the front flow path portion 43a and the volume of the rear flow path portion 43b of the gas flow path 43. It is also big enough. Accordingly, here, the rear portion of the accommodation space 18 is a diffusion space 60 in which the hydrogen gas that has flowed through the gas flow path 43 is diffused.

  Thus, in the exhaust gas dilution apparatus of the present embodiment, the exhaust hydrogen gas from the anode electrode side introduced into the accommodation space 18 through the gas introduction port 22 at a predetermined flow rate based on the purge pressure by the purge operation is First, in the gas flow path 43, while colliding with the shielding surfaces 50 and 48 of the second shielding plate 46 and the first shielding plate 44, the gas flow is caused to meander in a zigzag manner in the vertical direction. Due to the flow in the gas flow path 43, the flow rate of the hydrogen gas is reduced, and the hydrogen gas is mixed with the air existing in the gas flow path 43.

  Thereafter, hydrogen gas mixed with air in the gas flow path 43 passes through the first through hole 52 and the five notches 58 of the first shielding plate 44 and flows into the diffusion space 60. And diffused there and further mixed with the air present in the diffusion space 60.

  At this time, as shown by arrows in FIG. 1, the hydrogen gas that has flowed through the gas flow path 43 (the mixed gas mixed with air in the gas flow path 43) is high in the diffusion space 60 through the first through holes 52. In addition to being introduced from the position, it can also be introduced from a lower position through each notch 58. Therefore, for example, the hydrogen gas flowing through the gas flow path 43 is allowed to flow into the diffusion space 60 only from a high position through only the first through hole 52, so that the shielding of the first shielding plate 44 in the diffusion space 60 is performed. The amount of hydrogen gas flowing into the back surface side portion of the first shielding plate 44 inevitably becomes insufficient, such as a portion in contact with the back surface opposite to the surface 48 and a portion in the vicinity of the back surface. Unlike a dead space that is difficult or impossible to use as a mixed space with air, hydrogen gas sufficiently flows into the back side portion of the first shielding plate 44 in such a diffusion space 60. You will be tempted. That is, the dead space can be eliminated or reduced.

  As a result, the hydrogen gas introduced into the diffusion space 60 from the gas flow path 43 is diffused sufficiently and uniformly in the entire diffusion space 60, and the hydrogen gas and the diffusion space are thereby diffused. The air in 60 can be mixed more uniformly. Further, since the gas flows into the back surface side portion of the first shielding plate 44 in the diffusion space 60 through the first through hole 52 and the respective cutout portions 58, the hydrogen gas flows into the back surface side portion of the first shielding plate 44. The pressure loss generated at the time of inflow can be sufficiently suppressed.

  Moreover, as shown by the arrows in FIG. 3, when the hydrogen gas flowing through the gas flow path 43 passes through the notches 58, it collides with the shielding surface 48 portion located between the notches 58 adjacent to each other. Then, the gas flows around both sides of the shielding surface 48 to form a flow of hydrogen gas that passes through the notches 58 and passes through the first through hole 52 while overcoming the first shielding plate 44. A flow of hydrogen gas is formed. These hydrogen gas flows collide with each other at the back surface side portion of the first shielding plate 44 in the diffusion space 60, and several small vortex flows of hydrogen gas are formed there. As a result, the hydrogen gas flowing through the gas flow path 43 can be further sufficiently mixed with the air existing in the diffusion space 60.

  Thus, the hydrogen gas sufficiently and uniformly mixed with the air in the gas flow path 43 and the diffusion space 60 is led out into the downstream exhaust pipe 36 of the cathode side exhaust pipe 32 through the gap 42. . Here, since the flow rate of the hydrogen gas is sufficiently lowered in the gas flow path 43, the hydrogen gas mixed with air is led out into the downstream side exhaust pipe 36 in a relatively small amount. Will come to be.

  As described above, in the present embodiment, the hydrogen gas introduced into the accommodation space 18 of the container 10 is more sufficiently and efficiently mixed with the air in the accommodation space 18 in the entire accommodation space 18. In addition, the gas is led out gradually and smoothly into the downstream side exhaust pipe 36 of the cathode side exhaust pipe 32, where it can be mixed with the air in the cathode side exhaust pipe 32 and diluted.

  Therefore, in the exhaust gas dilution apparatus according to the present embodiment as described above, the dilution rate of hydrogen gas can be more sufficiently and stably reduced, and therefore, more excellent hydrogen gas dilution performance can be achieved. Thus, it can be exhibited even more stably.

  In such an exhaust gas diluting device, a dead space that is difficult or impossible to use as a mixed space of hydrogen gas and air is advantageously eliminated or reduced, and the entire storage space 18 is completely filled with hydrogen gas and air. Therefore, the size reduction of the container 10 and thus the entire apparatus can be realized very advantageously without impairing the diluting performance of hydrogen gas.

  Further, in the present embodiment, the left and right side end surfaces of the first shielding plate 44 and the second shielding plate 46 are integrated with the inner surfaces of the left wall portion 14 and the right wall portion 15 in the cylindrical wall portion 11 of the container 10. Since the front flow path 43a and the rear flow path 43b in the gas flow path 43 are communicated only through the second through hole 54, the total amount of hydrogen gas during the flow in the gas flow path 43 is The second shielding plate 46 and the first shielding plate 44 can be made to collide with each other reliably. Thereby, hydrogen gas can be more efficiently and sufficiently mixed with the air present therein in the gas flow path 43.

  Furthermore, in the exhaust gas dilution device of the present embodiment, the second shielding plate 46 makes the shielding surface 50 face the upper part of the middle part of the front bottom wall part 16 including the site where the gas introduction port 22 is formed. Therefore, the flow of hydrogen gas introduced into the gas flow path 43 of the accommodation space 18 through the gas introduction port 22 is caused by the shielding surface 50 of the second shielding plate 46 through the gas introduction port 22. The hydrogen gas can be collided more reliably, so that the hydrogen gas can be mixed with the air in the gas flow path 43 more fully.

  Further, in such an exhaust gas dilution device, the hydrogen gas introduced into the gas flow path 43 of the accommodation space 18 is made to flow in the gas flow path 43 in a zigzag manner in the vertical direction, while the gap 42 and the gas discharge port 26, the hydrogen gas forced into the entire gas flow path 43 even when the flow rate or flow rate of the hydrogen gas introduced into the accommodating space 18 is small. Can be reliably distributed. Thereby, hydrogen gas and air can be mixed more sufficiently in the gas flow path 43.

  Further, in the present embodiment, the cathode side exhaust pipe 32 is inserted through the container 10, and the gap 42 for leading hydrogen gas to the cathode side exhaust pipe 32 is formed in the container 10. For example, unlike the case where a bypass flow path is provided in the cathode side exhaust pipe 32 and a container is provided in the middle of the bypass flow path, components and members constituting the bypass flow path can be advantageously omitted, Compared to a device having a bypass flow path, the number of parts can be reduced and the entire device can be simplified.

  Further, in the exhaust gas dilution device of the present embodiment, the generated water introduced into the container 10 together with the hydrogen gas is efficiently discharged into the atmosphere through the downstream exhaust pipe 36 of the cathode side exhaust pipe 32. Therefore, it is possible to prevent such generated water from being stored in the container 10 and frozen to adversely affect the dilution performance of hydrogen gas.

  By the way, in the embodiment described above, the ratio of the sum of the opening areas of the notches 58 to the area of the shielding surface 48 of the first shielding plate 44 is a value exceeding approximately 20%. It is not limited to this, and can be changed as appropriate. However, the ratio of the total opening area of the notch to the shielding surface is desirably a value within the range of 10% or more and less than 30%.

  This is because if the ratio of the total opening area of the notch to the shielding surface is less than 10%, the amount of hydrogen gas passing through the notch is too small because the opening area of the notch is too small. Thus, the amount of hydrogen gas flowing into the rear surface portion of the container opposite to the shielding surface of the shielding member provided with the notch portion is insufficient, whereby the hydrogen gas and the air This is because mixing may be insufficient. If the ratio is 30% or more, this time, the opening area of the notch is too large, which is opposite to the shielding surface of the shielding member provided with the notch in the container. It becomes difficult to form a number of small vortexes of hydrogen gas on the back side of the container, and this also raises a concern that the mixing of hydrogen gas and air in the entire container will be insufficient. Because.

  Here, in order to confirm the above matters, the tests conducted by the present inventors will be described in detail.

  First, a first shielding plate (44) having a structure as shown in FIGS. 1 to 3 and having a rectangular shape of width × length: 17.6 cm × 10.6 cm provided in the container (10). On the other hand, a notch part (58) having a rectangular shape is formed in the size and number as shown in Table 1 below, and the ratio of the total opening area of the notch part (58) to the area of the shielding surface (48) Eight types of exhaust gas diluting devices having different values (hereinafter referred to as notch opening ratios and also shown in Table 1 as notch opening ratios) were prepared and prepared. And about these 8 types of exhaust-gas dilution apparatuses, it was set as the test samples 1-8 in an order from the thing with a small notch part opening rate.

  Moreover, apart from the exhaust gas dilution apparatus of the specimens 1 to 8, it has a structure as shown in FIGS. 1 to 3, and in the container (10), width × length: 17.6 cm × 10. Although the first shielding plate (44) having a rectangular shape of 6 cm is provided, the exhaust gas dilution is not provided at all with respect to the first shielding plate (44), that is, the notch opening ratio is zero. A device was made and prepared. This exhaust gas dilution device was designated as test sample 9.

  Then, using the exhaust gas dilution apparatuses of the specimens 1 to 9 thus prepared, the superiority or inferiority of the dilution performance of each of the exhaust gas dilution apparatuses was examined in the following manner using helium gas instead of hydrogen gas. It was.

  That is, using the exhaust gas diluting device of the sample 1, a cylinder with a solenoid valve filled with helium gas is inserted into a gas inlet (22) of the exhaust gas diluting device through a known regulator. Connected. Then, air is passed through the insertion hole (24) and the gas discharge port (26) into the air circulation pipe (32) inserted into the exhaust gas dilution device of the specimen 1 in the actual fuel cell vehicle. It was made to circulate with the flow volume which circulates in the cathode side exhaust pipe.

  Thereafter, in such a state of air flow into the air flow pipe (32), the helium gas cylinder is replaced with a hydrogen gas discharge pattern that is discharged from the anode electrode side by a purge operation in an actual fuel cell vehicle. By operating the solenoid valve, helium gas was intermittently supplied into the exhaust gas dilution device of the specimen 1 through the gas inlet (22). And the peak concentration of helium gas in the exhaust gas discharged | emitted from the discharge port of an air circulation pipe (32) by such supply of helium gas once was measured using the well-known helium gas concentration sensor. . The relationship between the notch opening ratio obtained based on this measurement result and the peak concentration of helium gas in the exhaust gas is shown in FIG. Note that 1 vol.% Of helium gas corresponds to 1.6 vol.% Of hydrogen gas.

  Subsequently, instead of the exhaust gas dilution device of the specimen 1, the exhaust gas dilution devices of the specimens 2 to 9 are used to connect each of the exhaust gas dilution devices instead of the helium gas cylinder, and the same as above. The operation was performed, and the peak concentration of helium gas in the exhaust gas in each of the exhaust gas dilution devices of the specimens 2 to 9 was examined. And the relationship between the notch opening ratio obtained based on these measurement results and the peak concentration of helium gas in the exhaust gas is shown in FIG. Of course, also in this test, 1 vol.% Of helium gas corresponds to 1.6 vol.% Of hydrogen gas.

  As apparent from the graph of FIG. 4, in the exhaust gas dilution apparatus of the specimens 1 to 5 in which the notch opening ratio is a value within the range of 10% or more and less than 30%, helium in the exhaust gas The gas peak concentration is a relatively low value of 1.12 vol.% Or less. On the other hand, in the exhaust gas dilution device of the specimens 6 to 9 in which the notch opening ratio is less than 10% or 30% or more, the helium gas peak concentration in the exhaust gas is 1.13 vol. It is clearly higher than the helium gas peak concentration in the exhaust gas in the exhaust gas dilution apparatus of the specimens 1 to 5 at. From this, the notch opening ratio, that is, the ratio of the total opening area of the notch to the area of the shielding surface is set to a value within the range of 10% or more and less than 30%, so that the helium gas dilution performance Thus, it can be clearly recognized that the dilution performance of hydrogen gas can be enhanced more effectively.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the said embodiment, although the shielding member was comprised by the 1st shielding board 44 and the 2nd shielding board 46, if this shielding member has a shielding surface, it will be a rectangular board | plate material. However, the present invention is not limited to this, and it may be configured by block-like members or block-like members having various shapes.

  Further, the number of the shielding members disposed may be three or more as long as it is plural. Of the plurality of shielding members, at least the one closest to the lead-out portion needs to be provided with a notch. In other words, notches may be provided for all shield members including the shield member proximal to the lead-out portion, and the shield member proximal to the lead-out portion and other members may be appropriately selected. It is also possible to provide a notch in only some selected ones.

  Furthermore, the shielding member should just stand by turns in the distribution direction of hydrogen gas with respect to one and the other of the two inner surface parts which mutually oppose among the inner surface parts of a container. Therefore, for example, unlike the above-described embodiment, a shielding member can be provided for two inner surface portions of the inner surface portion of the container that are opposed in the horizontal direction. Further, the inner surface portion where the shielding member is erected and the inner surface portion adjacent to the shielding member do not necessarily have to be integrated, and there is no problem even if a through hole or a gap is provided between them. Absent.

  Furthermore, the shape of the notch is not limited to the illustrated longitudinal rectangular shape. Further, although the size is not particularly limited, as described above, the ratio of the total opening area of the notch to the shielding surface of the shielding member provided with the notch is preferably 10% or more and less than 30%. It is set to be a value within the range of.

  Furthermore, in the above-described embodiment, the lead-out portion is configured by the gap 42 provided in the housing body 10, and the hydrogen gas introduced into the housing body 10 is inserted into the housing body 10 on the cathode side exhaust pipe. 32, the cathode side exhaust pipe and the accommodating body are separately arranged in parallel, and the cathode side exhaust pipe and the accommodating body are arranged in the internal space thereof, for example. Are connected to each other through a communication flow path, and the hydrogen gas in the container 10 can be led out into the cathode side exhaust pipe through the communication flow path, and the lead-out portion is constituted by the communication flow path. You can also Further, in the case of adopting a conventionally known structure in which a container is connected to a bypass flow path provided in the cathode side exhaust pipe, the hydrogen gas and air in the container are mixed in the bypass flow path. A portion that allows the gas to be led out into the cathode side exhaust pipe is configured as a lead-out portion.

  Furthermore, the arrangement position and the number of such introduction parts and introduction parts for introducing hydrogen gas into the container are not particularly limited to those shown in the embodiment.

  Moreover, in the said embodiment, from the space between the 1st shielding board 44 and the 2nd shielding board 46 in the downstream of the hydrogen gas distribution direction rather than the 1st shielding board 44 which is the shielding member nearest to the derivation | leading-out part. Although a diffusion space 60 having a large volume is provided, this diffusion space 60 is not essential. Therefore, even if the downstream portion of the hydrogen gas flow direction relative to the shielding member closest to the lead-out portion and the portion between the shielding members facing each other have the same volume, or the former Even if the volume is smaller than the latter, there is no problem.

  In addition, the present invention can be similarly applied to any exhaust gas dilution device for a fuel cell used in various applications in addition to an exhaust gas dilution device for a fuel cell installed in a fuel cell vehicle. Of course there is.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

FIG. 3 is a longitudinal cross-sectional explanatory view showing an embodiment of an exhaust gas dilution device for a fuel cell according to the present invention, corresponding to the II cross section of FIG. It is II-II sectional explanatory drawing in FIG. FIG. 3 is an explanatory view taken along the line III-III in FIG. 1. Several fuel cell exhaust gas diluting devices having the structure shown in FIGS. 1 to 3 and having different notch opening ratios, and a fuel cell in which no notch is provided in the shielding member 6 is a graph showing the relationship between the notch opening ratio and the peak concentration of helium gas, which is a substitute for hydrogen gas, in the exhaust gas in each of the exhaust gas dilution devices.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Container 11 Cylinder wall part 12 Upper wall part 13 Lower wall part 18 Storage space 22 Gas introduction port 24 Insertion hole 26 Gas discharge port 30 Anode side exhaust pipe 32 Cathode side exhaust pipe 34 Upstream side exhaust pipe 36 Downstream side exhaust pipe 42 Gap 43 Gas flow path 44 First shielding plate 46 Second shielding plate 48, 50 Shielding surface 58 Notch 60 Diffusion space

Claims (9)

A container that can store hydrogen gas discharged from the anode electrode side, and an introduction part and a lead-out part provided in the container, and the hydrogen gas is introduced into the container through the introduction part. The hydrogen exhausted from the cathode electrode side is circulated in the interior, and the hydrogen accommodated in the accommodating body is disposed in an air circulation conduit for exhausting the air to the atmosphere from an exhaust port provided at one end. The exhaust gas of the fuel cell in which the hydrogen gas is diluted with the air and is discharged into the atmosphere by deriving the gas through the deriving unit and mixing it with the air in the air circulation pipe In the dilution device
A plurality of shielding members provided with shielding surfaces that block the flow of the hydrogen gas that is circulated in the container from the introduction part toward the lead-out part are provided with a predetermined distance in the distribution direction of the hydrogen gas in the container. The inner surface of one of the two inner surface portions of the container in which the shielding members facing each other are positioned opposite to each other, and one of the opposing shielding members is positioned to face each other in a direction crossing the flow direction of the hydrogen gas. And the other shielding member extending toward the one inner surface portion with respect to the other inner surface portion. Further, among the plurality of shielding members, at least the shielding member closest to the lead-out portion is provided with a notch portion extending a predetermined length from the distal end portion toward the base side. Fuel cell exhaust gas dilution device to.   A space having a larger volume than the space formed between the opposing shielding members is formed on the downstream side in the hydrogen gas flow direction with respect to the shielding member closest to the lead-out portion in the container. The exhaust gas dilution device for a fuel cell according to claim 1.   A plurality of the cutout portions are provided with respect to the shielding member closest to the lead-out portion, and the plurality of cutout portions are positioned side by side in a direction perpendicular to the flow direction of the hydrogen gas. The exhaust gas dilution device for a fuel cell according to claim 1 or 2.   The total opening area of the notch provided in the shielding member closest to the lead-out portion is a value that is a ratio of 10% or more and less than 30% with respect to the area of the shielding surface of the shielding member. The exhaust gas dilution device for a fuel cell according to any one of claims 1 to 3, which is set.   The flow of the hydrogen gas circulated from the introduction part to the lead-out part only between the front end surface and the inner surface part of the two inner surface parts facing the front end surface. Any one of claims 1 to 4, wherein the hydrogen gas flow is blocked by the shielding member except for the through-holes. An exhaust gas dilution device for a fuel cell according to claim 1.   The shielding member closest to the introduction portion among the plurality of shielding members is positioned with the shielding surface facing the forming portion of the container in the introduction portion. 6. An exhaust gas dilution device for a fuel cell according to any one of items 5 to 5.   The two inner surface portions of the container are configured by an upper inner surface portion and a lower inner surface portion that are opposed to each other in the vertical direction, and the plurality of shielding members are divided into the upper inner surface portion and the lower inner surface portion. The exhaust gas dilution device for a fuel cell according to any one of claims 1 to 6, wherein the exhaust gas dilution device is disposed upright with respect to each other.   The container includes a first side inner surface portion and a second side inner surface portion that are opposed to each other in the horizontal direction, and the air circulation pipe line is located upstream and downstream in the air flow direction. Each of the upstream side pipe line and the downstream side pipe line, and the upstream side pipe line is formed at the distal end of the first side part inner surface. A front end opening of the upstream side pipe passing through the lower part of the part and entering the containing body and located in the containing body penetrates the lower part into the inner surface part of the second side part. In a position where a predetermined gap is formed between the connection hole and the connection hole formed in such a manner that it is arranged to open toward the connection hole, while the downstream pipe line communicates with the container. Connected to the connection hole in the inner surface portion of the second side portion and circulates in the air circulation pipe line The air to be squeezed is configured to be blown out from the front end opening of the upstream side pipe into the downstream side pipe, and the lead-out part is a front end opening of the upstream side pipe And the gas formed in the gap formed between the inner surface portion of the second side portion and the hydrogen gas accommodated in the accommodating body from the distal end opening of the upstream side conduit. The exhaust gas of the fuel cell according to any one of claims 1 to 7, wherein the exhaust gas is mixed into the air blown out toward the downstream pipe line through the lead-out portion. Dilution device. The said shielding member stands up with respect to the lower inner surface part of the said container, The through-hole which can distribute | circulate a liquid is provided in the lower end part of the shielding member standingly arranged in this lower inner surface part. 9. An exhaust gas dilution device for a fuel cell according to claim 8.

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