JP5799249B2 - Exhaust system - Google Patents

Description

  The present invention relates to an exhaust device attached to a fuel cell device including a fuel cell.

  In recent years, solid polymer fuel cell systems have been actively developed as systems suitable for household fuel cell cogeneration systems (hereinafter referred to as “fuel cell systems”). The polymer electrolyte fuel cell system generates power by an electrochemical reaction between a fuel gas containing hydrogen and an oxidant gas containing oxygen. On the other hand, hydrogen is necessary for electrochemical reactions, but the hydrogen infrastructure is not yet fully prepared. Accordingly, the polymer electrolyte fuel cell system includes a hydrogen generator that generates a hydrogen-rich fuel gas by reforming raw materials such as city gas, LP gas, and kerosene, and hydrogen generated from the hydrogen generator, Electric power is generated by reacting oxygen in the air with a polymer electrolyte fuel cell (hereinafter referred to as “fuel cell”). In addition, a fuel cell system for utilizing heat generated by an electrochemical reaction or heat of exhaust gas discharged from a hydrogen generator has been developed. Such a fuel cell system recovers heat as hot water and stores it in a hot water storage tank, and effectively uses the stored hot water as a heat supply medium to the outside.

  2. Description of the Related Art Conventionally, a fuel cell power generation system that generates power using city gas or the like in a package (housing) containing a hydrogen generator and a fuel cell as described above is known (for example, Patent Document 1). reference).

  Further, when the casing of the fuel cell device is configured by a rectangular parallelepiped whose height direction is longer than the width direction and the depth direction (see, for example, Patent Document 2), exhaust gas that exhausts exhaust gas generated from the fuel cell device to the outside Mouth and house windows and house ventilation openings are about the same height, and exhaust gas can flow directly into the home. Therefore, it is conceivable to install an exhaust device (see, for example, Patent Document 3) that can change the exhaust direction used also for a water heater or the like.

  6 is an external view of a fuel cell device 102 to which a conventional exhaust device 101 described in Patent Documents 1 to 3 is attached, and FIG. 7 is a configuration diagram of the fuel cell device 102 of FIG. As shown in FIG. 7, inside the housing 103, a hydrogen generator 104 that generates hydrogen-rich fuel gas from a raw material such as city gas and water, an air pump 105 that supplies air, and a hydrogen generator 104 The fuel cell 106 that generates power using the fuel gas generated in step S1 and the air supplied from the air pump 105, the exhaust gas heat exchanger 107 that recovers the heat of the exhaust gas discharged from the hydrogen generator 104, and the exhaust gas heat exchange The exhaust duct 108 that exhausts the exhaust gas that has passed through the vessel 107 to the outside of the housing 103 and the housing exhaust port 109 that allows the exhaust duct 108 and the exhaust device 101 to communicate with each other are provided.

  FIG. 8 is a configuration diagram of an exhaust device 101 for the conventional fuel cell device 102. As shown in FIG. 8, the exhaust device 101 has a cylindrical shape with openings formed at both ends, and a main body 122 in which an air supply port 121 through which exhaust gas or the like passes is formed on a side surface, and both ends of the main body 122. A shield plate 123 that is selectively inserted into one end of the main body 122, and an exhaust plate 125 that is inserted into the other end of both ends of the main body 122 and has an exhaust port 124 through which exhaust gas or the like passes.

JP 2005-276757 A JP2005-032461 JP 2001-208339 A

  In general, the temperature of the exhaust gas of the fuel cell device is lower than that of a boiler, and the emission amount is lower than that of a boiler. Therefore, when the exhaust device and the exhaust gas exchange heat, the exhaust gas easily reaches the dew point, and the water vapor in the exhaust gas is often condensed to generate condensed water.

  However, in the configuration of the conventional exhaust device 101, the exhaust port 124 is provided on the entire surface of the exhaust plate 125 in the exhaust gas discharge direction, so that dew condensation water in the exhaust device 101 flows out from the exhaust port 124 of the exhaust device 101 to the outside. . In particular, when the mounting position of the exhaust device 101 is at the same height as the house window or the house ventilation opening, the dew condensation water that has flowed out of the exhaust device 101 is affected by wind or the like before dropping to the ground. It tends to adhere to the outer surface of the housing 103 of the fuel cell device 102. In addition, the dew condensation water often becomes acidic when hydrogen in the off-anode gas of the fuel cell device 102 is dissolved. Therefore, the subject that the dew condensation water adhering to the housing | casing 103 deteriorates the outer surface of the housing | casing 103 arises.

  Moreover, in the structure of the conventional exhaust apparatus, a screw is generally used to fix the main body, the shielding plate, and the exhaust plate. In such a case, there is a possibility that the condensed water described above enters the gap between the screws and is exposed to the outside, thereby adhering to the outer surface of the housing. Not only that, it also takes time to install and remove the exhaust device during maintenance.

  The present invention solves the above-described conventional problems, and even when an exhaust device capable of changing the exhaust direction is attached to a fuel cell device, the deterioration of the outer surface of the housing is reduced, the internal sealing performance is high, and An object is to provide an exhaust device that is easy to handle.

  In order to solve the above-described conventional problems, an exhaust apparatus according to the present invention includes a fuel cell that generates power by an electrochemical reaction between a fuel gas containing hydrogen and an oxidant gas, and a hydrogen generator that generates fuel gas containing hydrogen. And an exhaust device for a fuel cell device that is attached to a fuel cell device including a housing that contains the fuel cell and the hydrogen generator, and that exhausts exhaust gas generated from the hydrogen generator to the outside of the housing, It has a hollow shape with openings at both ends, and a main body that communicates with the housing by an air supply port formed at a part of the side surface that connects both ends, and an opening that is selectively disposed at one end of both ends of the main body And an exhaust plate formed at the other end of both ends of the main body and formed with an exhaust port for communicating the main body and the outside. Projecting In which Nji is formed.

  The exhaust device for a fuel cell device of the present invention and the fuel cell device to which the exhaust device is attached, condensate water condensed in the exhaust device by the flanges provided at both ends of the main body, so that the condensed water on the outer surface of the housing Can be prevented and deterioration of the outer surface of the housing can be reduced.

1 is an external view of an exhaust device according to Embodiment 1 of the present invention attached to a fuel cell device. 1 is a configuration diagram in which an exhaust device according to Embodiment 1 of the present invention is attached to a fuel cell device. Configuration diagram (exploded view) of an exhaust device according to Embodiment 1 of the present invention Sectional drawing of the exhaust apparatus in Embodiment 1 of this invention Sectional drawing when the exhaust apparatus in Embodiment 1 of this invention is mounted | worn with the housing | casing exhaust port of the fuel cell apparatus External view of conventional exhaust system attached to fuel cell system Configuration diagram of conventional exhaust system attached to fuel cell system Configuration diagram of conventional exhaust system (exploded view)

  1st invention accommodates the fuel cell which produces electric power by the electrochemical reaction of the fuel gas containing hydrogen, and oxidant gas, the hydrogen generator which produces | generates the fuel gas containing hydrogen, the fuel cell, and the hydrogen generator An exhaust device for a fuel cell device that is attached to a fuel cell device including a housing and exhausts exhaust gas generated from the hydrogen generator to the outside of the housing, and has a hollow shape with openings formed at both ends. In addition, a main body that communicates with the housing by an air supply port formed at a part of the side surface that connects both ends, a shielding plate that is selectively disposed at one end of each end of the main body to shield the opening, and both ends of the main body An exhaust plate disposed at the other end and formed with an exhaust port for communicating the main body with the outside, and flanges projecting inside the main body are formed at the openings at both ends of the main body. Features . With such a configuration, the condensed water condensed in the exhaust device is blocked by the flanges provided at both ends of the main body, so that the condensed water is prevented from flowing out from the exhaust port of the exhaust device. It is possible to prevent dew condensation from adhering to the outer surface and reduce deterioration of the outer surface of the housing.

  According to a second invention, in the first invention, the main body includes a first member having an open portion in a hollow side surface portion and having flanges formed in openings at both ends, and an open portion in the side surface portion of the first member. A second member that forms an air supply port arranged to cover the second member, and the second member further includes first and second pressing portions projecting toward the first member in the vicinity of both end portions, The first pressing portion presses one of the shielding plate and the exhaust plate against the flanges at one end of both ends of the main body, and the second pressing portion fixes the remaining plate of the shielding plate and the exhaust plate to the other of the main body. The main body, the shielding plate, and the exhaust plate are fixed by pressing against the end flange. With such a configuration, the exhaust device is fixed in a state in which the shielding plate and the exhaust plate are sandwiched between the flange, the first pressing portion, and the second pressing portion. Therefore, the contact surfaces of the main body, the shielding plate, and the exhaust plate In addition to improving the sealing performance, it is possible to simplify handling such as attachment and detachment, and the sealing structure can be maintained without being detached even when an external force is applied.

  A third invention is a fuel cell device to which the exhaust device according to the first or second invention is attached, wherein the housing is a rectangular parallelepiped having a height direction longer than the width direction and the depth direction, and the height direction. A housing exhaust port that allows the housing and the exhaust device to communicate with each other is formed at a position that is higher than half of the height, and the exhaust device is attached so as to cover the housing exhaust port. With such a configuration, an exhaust device capable of changing the exhaust direction to the fuel cell device in order to prevent the condensed water from leaking from the exhaust device and prevent the condensed water from adhering to the outer surface of the housing of the fuel cell device. Even when attached, it is possible to reduce deterioration of the outer surface of the casing placed in a more severe environment than the inner surface of the casing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is an external view of an exhaust device 1 according to Embodiment 1 of the present invention attached to a fuel cell device 2. FIG. 2 is a configuration diagram of the exhaust device 1 according to Embodiment 1 attached to a fuel cell device 2. FIG. It is.

  As shown in FIG. 2, the fuel cell device 2 to which the exhaust device 1 according to the first embodiment is attached includes a fuel cell 3 that generates power by an electrochemical reaction between a fuel gas containing hydrogen and an oxidant gas, A hydrogen generation device 4 that generates a fuel gas containing hydrogen, and a housing 5 that houses the fuel cell 3 and the hydrogen generation device 4. Further, the fuel cell device 2 includes an air pump 6 that supplies air to the fuel cell 3, an exhaust gas heat exchanger 7 that recovers the heat of the exhaust gas discharged from the hydrogen generator 4, and exhaust gas heat. An exhaust duct 8 that guides the exhaust gas that has come out of the exchanger 7 to the outside of the housing 5, and a drain hose 9 that discharges condensed water and rainwater accumulated in the exhaust duct 8 to the outside are provided. The above-described members inside the casing 5 are connected in the order of the air pump 6, the fuel cell 3, the hydrogen generator 4, the exhaust gas heat exchanger 7, the exhaust duct 8, and the drain hose 9, and exchanges gases and the like through the piping. It is carried out.

  The housing 5 is a rectangular parallelepiped whose height direction is longer than the width direction and the depth direction. A hole-like housing exhaust port 10 is formed at a position higher than half the height in the side surface of the housing 5. The housing exhaust port 10 communicates the housing 5 and the exhaust device 1, and the exhaust device 1 is attached so as to cover the housing exhaust port 10.

  3 is a configuration diagram (exploded view) of the exhaust device 1 of the present invention, FIG. 4 is a cross-sectional view of the exhaust device 1 of the present invention, and FIG. 5 is a case exhaust of the housing 5 of the exhaust device 1 of the present invention. FIG. 3 is a cross-sectional view of a state in which the mouth 10 is attached. As shown in FIG. 3, the exhaust device 1 according to the first embodiment has a hollow shape with openings formed at both ends, and is enclosed by an air supply port 11 formed at a part of a side surface connecting both ends. A main body 12 that communicates with the body 5, a shielding plate 13 that is selectively disposed at one end of both ends of the main body 12 to shield the opening, and is disposed at the other end of both ends of the main body 12, and the main body 12 and the outside And an exhaust plate 15 in which a main body exhaust port 14 to be communicated is formed.

  The main body 12 includes a first member 21 having an open portion 16 in a hollow side surface portion, and a second member 22 forming an air supply port 11 disposed so as to cover the open portion 16 of the side surface portion of the first member. Is provided. In the first member 21, the first flange 17 is formed at the openings at both ends, and the second flange 18 is formed at the opposite end of the open portion 16.

  As shown in FIG. 3, the first member 21 has a generally U-shaped cross section, and the first flange 17 extends over the entire circumference of the opening at both ends of the first member 21 (generally the entire circumference of the U-shaped opening). The second flange 18 is formed over the entire length of the opposite ends of the open portion 16.

  The second member 22 includes a plate 27 that covers the open portion 16 of the main body 12, and first and second pressing portions 23 and 24. The plate 27 has a hole formed by the air supply port 11.

  The 1st press part 23 and the 2nd press part 24 are arrange | positioned in the vicinity of the both ends of the 2nd member 22 so that it may protrude toward the 1st member 21, have a frame shape, and external force is not added. In the natural state, they are slightly tilted in directions away from each other, and can be elastically deformed in directions close to each other by applying an external force.

  The shielding plate 13 has a rectangular parallelepiped shape with one surface open, and includes projecting pieces 19 that protrude inward from the central portions of the four sides forming the open surface. Further, the exhaust plate 15 has an open surface opposite to the surface on which the main body exhaust port 14 is formed. Like the shielding plate 13, the exhaust plate 15 is inward from the central part of the four sides forming the open surface. A projecting piece 20 projecting toward the center is provided.

  In a state where the shield plate 13, the exhaust plate 15, the first member 21, and the second member 22 are combined and assembled, the first pressing portion 23 presses the shield plate 13 against the first flange 17 at one end of the main body 12. The second pressing portion 24 presses the exhaust plate 15 against the second flange 18 at the other end of the main body 12. At this time, the shielding plate 13 comes into contact with the first pressing portion 23 at the end portion of the opened surface and the protruding piece 19 formed inside the surface, and the exhaust plate 15 is similarly formed on the opened surface. The projecting piece 20 formed inside the end portion and the surface contacts the second pressing portion 24. In this way, a leaf spring structure using the elastic deformation of the first and second pressing portions 23, 24 is constructed in the exhaust device 1, and fixing of each member of the exhaust device 1 is completed. Further, as shown in FIG. 5, for the purpose of ensuring sealing performance, the first packing 25 is provided on the contact surface between the first member 21, the shielding plate 13, the exhaust plate 15 and the second member 22, and the second member. A second packing 26 is provided on the contact surfaces of 22 and the housing 5. The first member 21 contacts the first packing 25 at the second flange 18.

  About the exhaust apparatus 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When city gas and pure water are supplied to the hydrogen generator 4, hydrogen-rich fuel gas is generated. The fuel cell 3 generates power by using hydrogen-rich fuel gas as an anode gas and air supplied from the air pump 6 as a cathode gas. The exhaust gas discharged from the hydrogen generator 4 is guided to the exhaust gas heat exchanger 7 to recover the heat of the exhaust gas, and then discharged from the casing exhaust port 10 to the outside of the casing 5 of the fuel cell device 2 through the exhaust duct 8. Is done. The discharged exhaust gas is guided into the exhaust device 1 through the air supply port 11 of the second member 22 in the exhaust device 1.

  Since the exhaust gas generated in the fuel cell device 2 is recovered by the exhaust gas heat exchanger 7 before being discharged to the outside of the housing 5, the temperature is low, and the amount is smaller than that of a general boiler. And few. Therefore, when the exhaust device 1 and the exhaust gas exchange heat, the exhaust gas easily reaches the dew point, and water vapor in the exhaust gas is condensed to generate dew condensation water.

  Condensed water generated in the exhaust device 1 tends to be acidic due to dissolution of hydrogen in the off-anode gas of the fuel cell device 2. If such condensed water flows to both ends of the main body 12 of the exhaust device 1, particularly in the direction of the exhaust plate 15 through which the exhaust gas flows, and leaks to the outside, it may adhere to the outer surface of the housing 5 and deteriorate the outer surface of the housing 5. There is. However, according to the exhaust apparatus 1 according to the present invention, the first flange 17 is formed on both ends of the main body 12, so that the first flange 17 blocks the dew condensation water and the both ends of the main body 12 of the dew condensation water. Prevent leakage from Further, since the shielding plate 13 and the exhaust plate 15 are fixed so as to be sandwiched between the first flange 17 and the first pressing portion 23 and the second pressing portion 24, the shielding plate 13, the exhaust plate 15 and the first flange 17 are fixed. The sealing performance of the contact surface of the is increased. Thereby, it is suppressed that condensed water flows out from a contact surface, and the leakage from the exhaust device 1 of condensed water is further prevented. In addition, since the height of the first flange 17 is higher than the height of the air supply port 11 of the second member 22, the condensed water accumulated in the exhaust device 1 flows from the air supply port 11 to the housing exhaust port 10. And is discharged from the drain hose 9 of the exhaust duct 8 to the outside of the fuel cell device 2.

  As described above, the casing 5 is configured by a rectangular parallelepiped whose height direction is longer than that in the width direction and the depth direction, and the casing exhaust port 10 is formed at a position higher than half the height in the height direction. Even when the exhaust device 1 is attached to the fuel cell device 2, the first flange 17 prevents the condensed water from flowing directly out of the exhaust device 1, so that the condensed water adheres to the outer surface of the housing 5. This can prevent the deterioration of the outer surface of the housing 5 that is placed in a more severe environment than the inner surface of the housing 5. Since the exhaust device 1 is fixed in a state where the shielding plate 13 and the exhaust plate 15 are sandwiched between the first flange 17, the first pressing portion 23, and the second pressing portion 24, the main body 12, the shielding plate 13, In addition, the sealing performance at the contact surface of the exhaust plate 15 can be improved, and the labor required for attachment and detachment during installation and maintenance can be reduced and handling can be improved as compared with a generally used fixing mechanism such as a screw. Further, the seal structure can be maintained without being disengaged even when an external force is applied.

  Further, by providing the first and second packings 25 and 26 on the contact surface, the sealing performance on the contact surface can be further enhanced.

  Although the exhaust device 1 is described as being cylindrical, the cross section of the exhaust device 1 is not limited to a circle, and can be configured in any shape.

  In addition, the shielding plate 13 and the exhaust plate 15 have been described as being disposed at one end of the main body 12 on the first member 21 side and the second member 22 side, respectively. Can also be arranged at either one end selectively according to the usage situation. In this way, the exhaust direction of the exhaust gas can be changed.

  Although the case where the first flange 17 is formed over the entire circumference of the opening of the first member 21 has been described, a configuration that exists at least on the lower surface side of the first member 21 may be employed.

  Regarding the leaf spring structure of the exhaust device 1, the case where the first pressing portion 23 and the second pressing portion 24 are elastically deformable has been described. However, a configuration in which the protruding pieces 19 and 20 are elastically deformable is adopted. Also good.

  As described above, the exhaust device according to the present invention reduces deterioration of the outer surface of the casing of the equipment to be attached, has high sealing performance, and is easy to handle. Applicable to fuel cell.

DESCRIPTION OF SYMBOLS 1 Exhaust device 2 Fuel cell device 3 Fuel cell 4 Hydrogen generator 5 Case 6 Air pump 7 Exhaust gas heat exchanger 8 Exhaust duct 9 Drain hose 10 Case exhaust port 11 Supply port 12 Body 13 Shielding plate 14 Exhaust port 15 Exhaust Plate 16 Opening portion 17 First flange 18 Second flange 19 Projection piece 20 Projection piece 21 First member 22 Second member 23 First pressing portion 24 Second pressing portion 25 First packing 26 Second packing 27 Plate

Claims (2)

A fuel cell comprising: a fuel cell that generates electricity by an electrochemical reaction between a fuel gas containing hydrogen and an oxidant gas; a hydrogen generator that generates fuel gas containing hydrogen; and a housing that houses the fuel cell and the hydrogen generator An exhaust device for a fuel cell device that is attached to the battery device and exhausts exhaust gas generated from the hydrogen generator to the outside of the housing,
A main body that has a hollow shape with openings at both ends and communicates with the housing by an air supply port formed at a part of a side surface that connects both ends;
A shielding plate that is selectively disposed at one end of both ends of the main body and shields the opening;
An exhaust plate disposed at the other end of both ends of the main body, and formed with an exhaust port for communicating the main body with the outside,
In the opening at both ends of the main body, a flange protruding inside the main body is formed ,
The main body forms a first member having an open portion on a hollow side surface portion and having flanges formed at openings at both ends, and an air supply port arranged to cover the open portion of the side surface portion of the first member. A second member,
The second member further includes first and second pressing portions projecting toward the first member near both ends,
The first pressing portion presses one of the shielding plate and the exhaust plate against the flanges at one end of the both ends of the main body, and the second pressing portion presses the remaining plate of the shielding plate and the exhaust plate on the main body. An exhaust device for a fuel cell device , wherein the main body, the shielding plate, and the exhaust plate are fixed by pressing against the flange at the other end . A fuel cell device to which the exhaust device according to claim 1 is attached,
The casing is a rectangular parallelepiped whose height direction is longer than the width direction and the depth direction, and a casing exhaust port that allows the casing and the exhaust device to communicate with each other at a position higher than half of the height direction. The exhaust device is a fuel cell device attached so as to cover the casing exhaust port.

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