JP5023668B2 - Exhaust gas diluter - Google Patents

Description

  The present invention relates to an exhaust gas diluter, and more particularly to an exhaust gas diluter that mixes exhaust gas with a dilution gas and discharges it to the outside.

  Since there is little impact on the environment, fuel cells are installed in vehicles. The fuel cell supplies, for example, a fuel gas such as hydrogen to the anode side of the fuel cell stack, supplies an oxidizing gas containing oxygen, such as compressed air, to the cathode side, and takes out necessary power by a cell chemical reaction through the electrolyte membrane. . At this time, reaction product water is generated. The fuel gas used in the cell chemical reaction is diluted with another gas and then discharged to the outside, and a diluter is used for this purpose. As the gas for dilution, an oxidizing gas used in the same fuel cell can be used. In this case, the used fuel gas is mixed with the used oxidizing gas by a diluter, diluted, and discharged to the outside. At that time, the reaction product water is also discharged.

  For example, in Patent Document 1, as a dilution container as an exhaust gas treatment device for a fuel cell, an elliptical shape whose axial center is substantially horizontal and whose cross-sectional shape orthogonal to the axial direction is the same over the entire length in the axial direction. As a form, it is disclosed to increase the mechanical strength (pressure strength) against repeated stress. In this dilution container, a partition plate that partitions the upstream side and the downstream side is provided in a substantially vertical direction, and a partition plate having a shape in which the upper part of the ellipse is cut out is provided substantially vertically, whereby the upper part communicates as a communication gas path. An upstream chamber and a downstream chamber are formed. In the upstream chamber, the tip of the anode off gas introduction pipe is opened upward slightly below the axis of the dilution container, and the dilution gas discharge port of the dilution gas pipe is directed upward at the inner bottom of the dilution container. As a result, the anode off-gas collides with the partition plate and flows into the downstream chamber through the upper communication gas path while mixing with the dilution gas, thereby increasing the residence time of the gas in the dilution container. It is stated. In the downstream chamber, the mixed gas is discharged to the outside through the mixed gas exhaust hole of the dilution gas pipe, and the liquid contained in the anode off gas is collected on the bottom of the dilution container through the partition plate and the inner wall of the dilution container. Is said to be discharged.

JP 2006-31998 A

  As described above, in the prior art, as an exhaust gas treatment device, a diluter that discharges liquid contained in exhaust gas as well as dilution of exhaust gas is described. By the way, when the vehicle is left in the outside air below the freezing point, the liquid contained in the exhaust gas and collected at the bottom of the diluter may freeze. In this case, the path of the exhaust gas is blocked by the freezing of the liquid, which may cause problems such as increased pressure loss and poor performance.

  An object of the present invention is to provide an exhaust gas diluter that can sufficiently exhibit its performance even at low temperatures.

The exhaust gas diluter according to the present invention includes a dilution vessel that is arranged in a horizontal direction with an axial center and sealed in a cylindrical shape, and a fuel cell that is inserted into the dilution vessel from one end face of the cylindrical shape. A pipe for introducing exhaust gas containing spent fuel gas, an exhaust gas introduction pipe whose outer periphery is airtightly fixed to one end face of the dilution container, and a pipe for introducing a dilution gas for diluting the exhaust gas. Is inserted through the other end surface from the one end surface of the tube, and discharges the dilution gas in the dilution container and the mixed gas of the exhaust gas and the dilution gas to the outside. A dilution gas introduction pipe provided with a suction hole and whose outer periphery is fixed in an airtight manner at one end face and the other end face of the dilution container, and between the dilution gas introduction pipe and the exhaust gas introduction pipe inside the dilution container A heat transfer tube provided by connecting One end is connected to the discharge hole of the dilution gas introduction pipe, the dilution gas is introduced into the pipe from the discharge hole, the other end is connected to the outer periphery of the exhaust gas introduction pipe, and A heat transfer tube that blows out the dilution gas, an outer peripheral heat insulating material that covers the outer periphery of the dilution container, a one side end surface heat insulating material that covers one side end surface of the dilution container, and the other side end surface heat insulating material that covers the other side end surface of the dilution container, It is characterized by providing.

  Further, in the exhaust gas diluter according to the present invention, the exhaust gas introduction pipe has a connection port with a flange for connecting to a pipe on the fuel cell side outside the one end face of the dilution container, and one end face heat insulating material Is made of an elastic material, and has a through slit that opens temporarily to pass through the flange part of the flanged connection port and restores it to adhere to the outer periphery of the exhaust gas introduction pipe after passing through the flange part. Is preferred.

  Further, in the exhaust gas diluter according to the present invention, it is preferable that the one-side end surface heat insulating material has an embedded hole portion for embedding the flange portion of the flanged connection port.

Further, in the exhaust gas dilution device according to the present invention, furthermore, it is preferable to provide the second heat transfer member provided to connect between the dilution gas introduction pipe and gas inlet tube.

Further, in the exhaust gas dilution device according to the present invention, dilution vessel, a plurality of partition members for partitioning the plurality of compartments along an inner space in the axial direction, communication windows for communicating the compartment adjacent However, it is preferable to have a plurality of partition members arranged gradually from the axial center side to the outer peripheral side as going from the one side end surface to the other side end surface.

More above configuration, in the interior of the dilution vessel, and connects the diluent gas introducing pipe and the exhaust gas inlet pipe, whereas the end of the diluent gas from the discharge hole connected to the discharge hole of the dilution gas introduction pipe A heat transfer tube is provided which is introduced into the tube, has the other end connected to the outer periphery of the exhaust gas introduction tube, and blows dilution gas to the outer periphery of the exhaust gas introduction tube. Thereby, the heat of the dilution gas and the heat of the dilution gas introduction pipe can be applied to the exhaust gas introduction pipe, and the freezing and clogging of the exhaust gas introduction pipe can be effectively prevented. In the exhaust gas diluter, the outer periphery, one end surface, and the other end surface of the dilution container provided with the exhaust gas introduction tube and the dilution gas introduction tube are respectively covered with a heat insulating material. Thus, the interior of the dilution container even outside temperature I is lower protected prevents freezing or the like of the liquid, it is possible also to sufficiently exhibit the performance of the dilution device at a low temperature.

  Further, even when the exhaust gas introduction pipe has a flanged connection port, the one-side end surface heat insulating material is made of an elastic material, and temporarily opens to pass the flange portion of the flanged connection port, and passes through the flange portion. After that, since the through slit is restored so as to be in close contact with the outer periphery of the exhaust gas introduction pipe, the periphery of the connection port with the flange can be firmly covered with the heat insulating material.

  Moreover, since the one-side end surface heat insulating material has the embedded hole part which embeds the flange part of the connection port with a flange, the part of the connection port with a flange is also protected from external temperature.

Further, diluter material discharge gas further second heat transfer member which connects between the dilution gas introduction pipe and the exhaust gas inlet pipe is provided. Thus, further heat the diluent gas introducing pipe can be given to the exhaust gas inlet pipe can be more effectively prevent freezing clogging of the exhaust gas introduction pipe.

Further, diluter material discharge gas, at a dilution vessel with the exhaust gas inlet pipe and a dilution gas introduction pipe is provided by a plurality of partition members, the internal space is partitioned into a plurality of compartments along the axial direction, adjacent A communication window for communicating the compartments to be arranged is gradually arranged from the axial side toward the outer peripheral side as going from the one side end surface to the other side end surface. As a result, when the exhaust gas and the dilution gas flow from the one end surface of the dilution container toward the other end surface, the exhaust gas first flows on the axial center side of the dilution container and gradually moves to the outer peripheral side. While effectively warming or keeping the tube or the like, the gas diffusion time can be lengthened and the dilution can be performed effectively.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, an exhaust gas diluter for exhausting spent gas of a fuel cell will be described. However, other exhaust gases may be used to dilute other exhaust gases and may freeze and block at low temperatures. It may be a diluter. The shape, material, and the like described below are examples for explanation, and can be appropriately changed according to the purpose of use, specifications, and the like.

  FIG. 1 is a perspective view of an exhaust gas diluter 20 for diluting and exhausting spent gas of a fuel cell. The exhaust gas diluter 20 has a structure in which the periphery of the dilution container 40 and the like is covered with a heat insulating material. In FIG. 1, the dilution container 40 and the like are disposed in the heat insulating material. The whole thing does not appear to be visible. FIG. 2 is a view showing only a portion of the heat insulating material. 3 and 4 are cross-sectional views of the exhaust gas diluter 20. FIG. 3 is a cross-sectional view seen from the front, and FIG. 4 is a cross-sectional view seen from the top. The configuration of the exhaust gas diluter 20 will be described with reference to these drawings.

  In these drawings, although not a constituent element of the exhaust gas diluter 20, the fuel gas 4, the oxidizing gas 6, the mixed gas 7 after dilution, and the moisture contained in the gas are condensed. Fastener 13 for fastening condensed water 8, fuel gas exhaust pipe 10 from the water fuel cell side, flange 12 of fuel gas exhaust pipe 10, flange 12 and flange 52 of exhaust gas introduction pipe 50 of exhaust gas diluter 20. The oxidant gas exhaust pipe 14, the oxidant gas exhaust pipe 14 and the connection tube 18 for connecting the dilution gas introduction pipe 60 of the exhaust gas diluter 20, the exhaust pipe 16 for discharging the mixed gas 7 to the outside and the dilution gas introduction pipe A connecting tube 19 is shown connecting the 60. Here, the fuel gas is, for example, hydrogen gas, the spent fuel gas corresponds to exhaust gas to be exhausted, the oxidizing gas is, for example, compressed air, and the used oxidizing gas dilutes the used fuel gas. Corresponds to dilution gas.

  As shown in FIGS. 3 and 4, the main body of the exhaust gas diluter 20 is provided through the dilution container 40, the exhaust gas introduction pipe 50 inserted into the dilution container 40, and the dilution container 40. And a dilution gas introduction pipe 60. As shown in FIG. 1, the exhaust gas diluter 20 is configured such that the main body including the dilution container 40 is covered with a plurality of heat insulating materials.

  The dilution container 40 is a sealed container having an axial center disposed in the horizontal direction and having a cylindrical shape. As shown in FIGS. 3 and 4, the height of the dilution container 40 in the front view is smaller than the width in the top view. That is, the dilution container 40 is a cylindrical sealed container having an elliptical cross section in a plane perpendicular to the axial direction. In terms of the strength of the cylindrical container, the cross section is preferably circular, but the reason why the cross section is elliptical is that the mountability is excellent when there is not much room in the height direction. For example, an exhaust gas diluter for a fuel cell mounted on a vehicle may be provided under a vehicle floor where there is not much room in the height direction, and in such a case, an elliptical cross section that is flat in the height direction. The cylindrical container is easy to mount.

  As the dilution container 40, a material having a suitable strength and formed into a predetermined shape can be used. For example, a cylindrical plate can be formed by bending a metal plate such as a stainless steel plate or an aluminum plate into an elliptical shape, and the openings on both sides thereof can be sealed with a plate material having an elliptical planar shape. The connection part of each member is sealed tightly airtight, for example by arc welding. An example of the dimensions of the dilution container 40 is that the plate thickness is about 1 mm to several mm, the major axis of the ellipse is about 400 mm, the minor axis is about 300 mm, and the length along the axial direction is about 500 mm. is there.

  The exhaust gas introduction pipe 50 is a pipe having a function of introducing the spent fuel gas 4 of the fuel cell as exhaust gas into the dilution container 40. The exhaust gas introduction pipe 50 is a thin pipe that is inserted into the dilution container 40 along the axis of the dilution container 40 from the axial center of the cylindrical one end face 42 of the dilution container 40. In contrast, the outer periphery is hermetically fixed by arc welding or the like.

  One end of the exhaust gas introduction pipe 50 protrudes to the outside of the dilution container 40 and has a flange 52 (see FIG. 3). The flange 52 is airtightly connected to the flange 12 of the fuel gas exhaust pipe 10 on the fuel cell side and the fastener 13 (see FIG. 4). Thus, since the flange 52 is a part connected to the fuel gas exhaust pipe 10, it can be called a connection port. Further, the other end of the exhaust gas introduction pipe 50 protrudes inside the dilution container 40, and the tip of the exhaust gas introduction pipe 50 has an obliquely cut shape. The used spent fuel gas is introduced from the center of the dilution container 40. It becomes the jet nozzle 54 which ejects toward the bottom part. As the exhaust gas introduction pipe 50, for example, a pipe in which a flange 52 is connected to a metal pipe made of the same material as that of the dilution container 40 by welding or the like can be used. An example of the diameter of the metal pipe has an outer diameter of about 10 mm to 15 mm and a wall thickness of about 1 mm to 2 mm. The size of the flange 52 is such that a plurality of fasteners 13 can be arranged.

  The dilution gas introduction pipe 60 has a function of introducing the oxidizing gas 6 that is a dilution gas for diluting the spent fuel gas 4 introduced into the dilution container 40 by the exhaust gas introduction pipe 50 into the dilution container 40 and the spent fuel. This is a tube having a function of sucking out the mixed gas 7 obtained by mixing the gas 4 and the oxidizing gas 6 and diluting the fuel gas 4 from the dilution container 40 and discharging it to the outside. The dilution gas introduction pipe 60 is inserted from the position on the bottom side of the cylindrical one end face 42 of the dilution container 40 through the other end face 44 along the direction parallel to the axis of the dilution container 40. Is done.

  The dilution gas introduction pipe 60 has a discharge hole 62 for discharging the oxidizing gas 6 inside the dilution container 40 and a suction hole 64 for sucking the mixed gas 7 of the spent fuel gas 4 and the oxidizing gas 6 outward. And are provided. The discharge hole 62 and the suction hole 64 are provided in the pipe wall of the dilution gas introduction pipe 60 so that the opening faces upward, that is, toward the exhaust gas introduction pipe 50. Further, a drain hole 66 is provided for discharging the condensed water 8 by condensing water contained in the spent fuel gas 4, the oxidizing gas 6 and the mixed gas 7. The drain hole 66 is provided on the pipe wall of the dilution gas introduction pipe 60 so that the opening faces the bottom of the dilution container 40. The condensed water 8 discharged toward the bottom of the dilution container 40 is discharged to the outside of the dilution container 40 through a drain hole not shown. The discharge hole 62, the suction hole 64, and the drain hole 66 are arranged in this order along the direction in which the oxidizing gas 6 flows. That is, the discharge hole 62, the suction hole 64, and the drainage hole 66 are arranged in this order from the introduction side of the oxidizing gas 6 toward the discharge side of the mixed gas 7. Depending on the arrangement position of the suction holes 64, the arrangement order of the drain holes 66 and the suction holes 64 can be reversed.

  One end of the dilution gas introduction pipe 60 protrudes outside the one end face 42 of the dilution container 40, and the other end protrudes outside the other end face 44 of the dilution container 40. And the outer periphery is airtightly fixed by arc welding etc. in the one end face 42 and the other end face 44 of the dilution container 40. One end of the fuel cell is connected to the oxidizing gas exhaust pipe 14 on the fuel cell side via the connection tube 18 and the other end is also connected to the discharge pipe 16 via the connection tube 19. As the connection tubes 18 and 19, for example, a rubber tube or a rubber hose having appropriate elasticity and flexibility can be used. For the dilution gas introduction pipe 60, for example, a metal pipe made of the same material as that of the dilution container 40 can be used. An example of the diameter of the metal pipe has an outer diameter of about 30 mm to about 50 mm and a wall thickness of about 1 mm to several mm.

  The operation of the dilution container 40 having the above-described configuration is as follows. That is, the spent fuel gas 4 discharged from the fuel cell side through the fuel gas exhaust pipe 10 is introduced into the dilution container 40 through the exhaust gas introduction pipe 50 and the oxidizing gas fed from the fuel cell side through the oxidizing gas exhaust pipe 14 6 can be introduced into the dilution container 40 through the dilution gas introduction pipe 60 and discharged from the discharge hole 62 into the dilution container 40. Then, the spent fuel gas 4 introduced by the exhaust gas introduction pipe 50 is mixed with the oxidizing gas 6 released from the discharge hole 62 and diluted to form the mixed gas 7, and again the suction hole 64 of the dilution gas introduction pipe 60. And mixed with the oxidizing gas 6 inside the dilution gas introduction pipe 60 and carried out of the dilution container 40. Then, the diluted mixed gas 7 can be discharged to the outside through the discharge pipe 16.

  In this way, by using the dilution container 40 including the exhaust gas introduction pipe 50 and the dilution gas introduction pipe 60, the spent fuel gas 4 as the exhaust gas is diluted with the oxidizing gas 6 as the dilution gas and discharged to the outside. can do. However, with this configuration alone, for example, when the dilution container 40 is placed in an environment below freezing point such as −20 ° C., moisture, condensed water, and the like are frozen, and the gas flow path and the like are blocked. For example, moisture contained in the spent fuel gas 4 is condensed and frozen, and the fine exhaust gas introduction pipe 50 is blocked. Further, the condensed water 8 drained from the dilution gas introduction pipe 60 freezes, closes the drain hole 66, and further, moisture condenses and freezes in the dilution gas introduction pipe 60, and the dilution gas introduction pipe 60 itself. Occlusion occurs. When the gas flow path is blocked, the dilution performance of the exhaust gas diluter 20 is degraded. Hereinafter, a configuration for preventing such a decrease in dilution performance at low temperatures will be described. In the following description, reference numerals in FIGS. 1 to 4 are used.

  One configuration for preventing a decrease in dilution performance at low temperatures is the use of effective insulation. Therefore, the exhaust gas diluter 20 is entirely covered with a heat insulating material around the dilution container 40. As shown in FIGS. 1 and 2, the heat insulating material includes an outer peripheral heat insulating material 22 that covers the outer periphery of the cylindrical portion of the dilution container 40, a one-side end surface heat insulating material 24 that covers one end face of the dilution container 40, and a dilution container. The other end face heat insulating material 26 covering the other end face of 40 is configured.

  The peripheral heat insulating material 22 covers the elliptical outer periphery of the dilution container 40, suppresses the external dissipation of heat from the dilution container 40 at that portion, and suppresses the temperature of the outside air from being transmitted to the dilution container 40 at that portion. It is a member having a function. The outer peripheral heat insulating material 22 is a cylindrical heat insulating member whose inner periphery has a shape corresponding to the elliptical outer peripheral shape of the cylindrical portion of the dilution container 40 and whose both ends are open.

  The outer peripheral heat insulating material 22 may be one obtained by integrally molding a suitable heat insulating material into a cylindrical shape, or a flat and flexible or deformable heat insulating material without any gap on the cylindrical outer periphery of the dilution container 40. It is good also as what is wound. For example, it is possible to use a molded plastic rubber such as ethylene propylene rubber (EPM) or ethylene propylene diene rubber (EPDM) in which a small amount of a third diene component is added to EPM. Alternatively, a heat insulating material such as glass fiber or non-woven fabric, for example, thin slate (trade name of Sumitomo 3M Co.) can be wound around the outer periphery of the dilution container 40 without any gap and fixed with an appropriate fastener such as a metal band. .

  The one-side end surface heat insulating material 24 and the other-side end surface heat insulating material 26 cover both side surfaces of the dilution container 40, suppress external heat dissipation from the dilution container 40 at that portion, and the temperature of the outside air at that portion. It is a member having a function of suppressing transmission to the dilution container 40. The one-side end surface heat insulating material 24 and the other-side end surface heat insulating material 26 close the openings at both ends of the outer peripheral heat insulating material 22 and cover both end surfaces of the dilution container 40, so that the outer peripheral heat insulating material 22 is more than the elliptical cross-sectional shape of the dilution container. It is the flat heat insulation member which has the ellipse shape extended outside as much as the thickness part.

  The one-side end surface heat insulating material 24 and the other-side end surface heat insulating material 26 have through holes 30 and 32 corresponding to the dilution gas introduction pipe 60. Further, the one end face heat insulating material 24 is provided with a through hole 34 corresponding to the exhaust gas introduction pipe 50 and a concave portion 36 in which the flange 52 of the exhaust gas introduction pipe 50 is embedded. That is, the recess 36 functions as an embedded hole for embedding the flange 52 in the heat insulating material. In FIG. 2, the recess 36 is shown as a recess having an opening on the outer side end face of the one side end face heat insulating material 24, but depending on the arrangement of the flange 52 in the exhaust gas introduction pipe 50, It is good also as what provides a recessed part as a hollow which has an opening in an external side end surface.

  Further, the one-side end surface heat insulating material 24 is temporarily opened to pass through a flange 52 that is integrated with the dilution container 40 by welding or the like and has a larger outer shape than the exhaust gas introduction pipe 50. A through slit 38 is provided for restoration so as to be in close contact with the outer periphery of the introduction pipe 50. The through slit 38 is a cut that passes through the centers of the through hole 34 and the recess 36, but the length does not reach the outer periphery of the one-side end surface heat insulating material 24. That is, the one-side end surface heat insulating material 24 is not divided into two bodies for passing the flange 52, but remains integral.

  Thus, by providing the through holes 30, 32, 34, the concave portion 36, and the through slit 38, both end surfaces of the dilution container 40 having a complicated outer shape having the exhaust gas introduction pipe 60 having the dilution gas introduction pipe 60 and the flange 52. The one-side end surface heat insulating material 24 and the other-side end surface heat insulating material 26 can be arranged without a gap.

  The next configuration for preventing a decrease in dilution performance at a low temperature is the use of a structure that applies heat to the exhaust gas introduction pipe 50 that is likely to freeze and close. In a fuel cell that generates electricity using a cell chemical reaction between a fuel gas and an oxidizing gas via an electrolyte membrane, the spent fuel gas is often mixed with an unused fuel gas and reused. When the ratio of impurities exceeds a certain limit due to repeated reuse, it is sent to the exhaust gas diluter 20 as exhaust gas. Therefore, the spent fuel gas 4 as the exhaust gas does not always flow, but flows intermittently. On the other hand, the used oxidizing gas 6 is always discharged during the operation of the fuel cell. Therefore, in general, the exhaust gas introduction pipe 50 is set to be thinner than the dilution gas introduction pipe 60. Further, since the spent fuel gas 4 is allowed to flow only intermittently, the exhaust gas introduction pipe 50 is easier to cool at a low temperature than the dilution gas introduction pipe 60 which is a thick pipe in which the oxidizing gas is always flowed. Freezing clogging due to residual moisture in the water tends to occur.

  As a structure for applying heat to the exhaust gas introduction pipe 50 that is easily frozen and closed in this way, a heat transfer member that thermally connects the dilution gas introduction pipe 60 and the exhaust gas introduction pipe 50 is provided. That is, a pipe 80 is connected to the discharge hole 62 of the dilution gas introduction pipe 60, and the pipe 80 extends upward and is connected to the outer peripheral wall of the exhaust gas introduction pipe 50. Thereby, heat can be given to the exhaust gas introduction pipe 50 via the pipe 80 from the dilution gas introduction pipe 60 that is hard to cool with respect to the exhaust gas introduction pipe 50 and is at a high temperature. The pipe 80 can be made of the same metal material as that of the dilution gas introduction pipe 60. Of course, the pipe 80 may be made of another material having good thermal conductivity. The pipe 80 is fixed so as to be thermally connected to the dilution gas introduction pipe 60 and the exhaust gas introduction pipe 50 by arc welding or the like.

  In addition to the pipe 80, a column member 82 made of a material having good thermal conductivity such as a metal material is provided between the dilution gas introduction pipe 60 and the exhaust gas introduction pipe 50. The column member 82 is also fixed so as to be thermally connected to the dilution gas introduction pipe 60 and the exhaust gas introduction pipe 50 by arc welding or the like. Thus, the pipe 80 and the column member 82 are heat transfer members that thermally connect the dilution gas introduction pipe 60 and the exhaust gas introduction pipe 50. Only one of the pipe 80 and the column member 82 may be provided, or another heat transfer member may be provided.

  Further, by sufficiently increasing the inner diameters of the discharge hole 62 and the pipe 80, the opening diameter of the pipe 80 can be made larger than the outer diameter of the exhaust gas introduction pipe 50, whereby the oxidizing gas 6 from the discharge hole 62 is guided to the pipe 80. It is possible to spray directly on the outer wall of the exhaust gas introduction pipe 50 while making it happen. Then, by providing the discharge hole 62 upward from the dilution gas introduction pipe 60 and just below the exhaust gas introduction pipe 50, the oxidizing gas 6 is supplied to the exhaust gas introduction pipe 50 directly above the discharge hole 62. Can be sprayed towards. Further, by guiding the jet oxidizing gas 6 by the pipe 80, the oxidizing gas 6 can be blown from the dilution gas introducing pipe 60 to the exhaust gas introducing pipe 50 at the shortest distance.

  Further, the discharge hole 62 in the dilution gas introduction pipe 60 is as close as possible to the one end face 42 inside the dilution container 40, that is, as close as the dilution gas introduction pipe 60 enters the inside of the dilution container 40. It is preferable to provide them. By disposing the discharge hole 62 in this way, the oxidizing gas can be blown onto the exhaust gas introduction pipe 50 at the highest temperature.

  The following configuration for preventing a decrease in dilution performance at a low temperature is a structure that can effectively warm or keep the dilution container 40 including the exhaust gas introduction pipe 50 that easily freezes and closes depending on the gas flow in the dilution container 40. Adoption. For this purpose, as shown in FIG. 4, the dilution container 40 is provided with a plurality of partition members 90 that partition the internal space into a plurality of compartments along the axial direction. A communication window 92 for communicating adjacent compartments is gradually arranged from the axial side toward the outer peripheral side as it goes from the one side end surface 42 to the other side end surface 44.

  By arranging the plurality of partition members 90 and the plurality of communication windows 92 in this way, the oxidizing gas 6 that is a dilution gas flowing out from the pipe 80 connected to the discharge hole 62 is allowed to flow in the meandering path 94 shown in FIG. Can be flowed as follows. That is, the oxidizing gas 6 flowing out from the pipe 80 initially meanders near the axis of the dilution container 40. Thus, the warm oxidizing gas 6 can warm the surroundings of the exhaust gas introduction pipe 50 or keep the temperature so as not to decrease. Then, as it flows toward the other end surface 44 of the dilution container 40, it gradually approaches the outer peripheral side of the dilution container 40 and meanders. As a result, the length of the flow path in which the oxidizing gas 6 as the dilution gas and the fuel gas 4 as the exhaust gas are mixed can be increased, the gas diffusion time for mixing can be increased, and dilution can be performed effectively. be able to.

1 is a perspective view of an exhaust gas diluter in an embodiment according to the present invention. In embodiment which concerns on this invention, it is a figure which extracts and shows only the part of a heat insulating material. In embodiment which concerns on this invention, it is sectional drawing seen from the front of the diluent for exhaust gas. In embodiment which concerns on this invention, it is sectional drawing seen from the upper surface of the dilution device for waste gas.

Explanation of symbols

  4 Fuel gas, 6 Oxidizing gas, 7 Mixed gas, 8 Condensed water, 10 Fuel gas exhaust pipe, 12, 52 Flange, 13 Fastener, 14 Oxidizing gas exhaust pipe, 16 Exhaust pipe, 18, 19 Connection tube, 20 For exhaust gas Diluter, 22 Outer peripheral heat insulating material, 24 One side end surface heat insulating material, 26 Other side end surface heat insulating material, 30, 32, 34 Through hole, 36 Recessed portion, 38 Through slit, 40 Dilution container, 42 One side end surface, 44 Other side end surface 50 exhaust gas introduction pipe, 54 jet outlet, 60 dilution gas introduction pipe, 62 discharge hole, 64 suction hole, 66 drain hole, 80 pipe, 82 column member, 90 partition member, 92 communication window, 94 meandering path.

Claims (5)

A diluting container which has a cylindrical shape and is sealed in a horizontal direction with an axial center;
A pipe for introducing exhaust gas containing spent fuel gas of a fuel cell, which is inserted from the cylindrical one end face of the dilution container, and whose outer periphery is fixed to the one end face of the dilution container in an airtight manner When,
A pipe for introducing a dilution gas for diluting the exhaust gas, which is inserted through the cylindrical end face of the dilution container from the one end face to the other end face, and discharge holes for releasing the dilution gas inside the dilution container; A dilution gas introduction pipe provided with a suction hole for sucking the mixed gas of the exhaust gas and the dilution gas toward the outside, the outer periphery of which is fixed airtightly at one end face and the other end face of the dilution container;
Inside the dilution container, it is a heat transfer pipe that is connected between the dilution gas introduction pipe and the exhaust gas introduction pipe, one end of which is connected to the discharge hole of the dilution gas introduction pipe and is used for dilution from the discharge hole A heat transfer pipe that introduces gas into the pipe, the other end is connected to the outer periphery of the exhaust gas introduction pipe, and blows dilution gas to the outer periphery of the exhaust gas introduction pipe;
An outer peripheral heat insulating material covering the outer periphery of the dilution container;
One side end surface heat insulating material covering one side end surface of the dilution container;
The other end surface heat insulating material covering the other end surface of the dilution container;
An exhaust gas diluter characterized by comprising: The exhaust gas diluter according to claim 1,
The exhaust gas introduction pipe has a connection port with a flange for connecting to the pipe on the fuel cell side outside the one end face of the dilution container,
The one-side end surface heat insulating material is made of an elastic material, and temporarily opens to pass the flange portion of the flanged connection port, and after passing through the flange portion, is restored to be in close contact with the outer periphery of the exhaust gas introduction pipe An exhaust gas diluter having a through slit. The exhaust gas diluter according to claim 2,
One side end surface heat insulating material has the embedding hole part which embeds the flange part of the connection port with a flange, The diluter for exhaust gas characterized by the above-mentioned. The exhaust gas diluter according to claim 1,
Furthermore, the exhaust gas dilution device, wherein Rukoto comprising a second heat transfer member provided to connect between the dilution gas introduction pipe and gas inlet tube. The exhaust gas diluter according to claim 1,
The dilution container
A plurality of partition members for partitioning the internal space into a plurality of partition chambers along the axial direction, the communication window for communicating adjacent partition chambers from the one side end surface to the other side end surface from the axial center side gradually the exhaust gas dilution device according to claim Rukoto which having a plurality of partition members disposed on the outer peripheral side.

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