Tail gas connecting device of solid oxide fuel cell (SOFC) system

Abstract

The utility model provides a tail gas connecting device of an SOFC (Solid Oxide Fuel Cell) system, and belongs to the field of fuel cells. The device comprises a galvanic pile and a catalytic burner, one side of the galvanic pile is connected with the catalytic burner, the galvanic pile comprises a plurality of bipolar plates which are horizontally stacked, a plurality of combustion holes which are longitudinally arranged at intervals are formed in the side, close to the galvanic pile, of the catalytic burner, and the combustion holes are matched with the bipolar plates in an inserted mode respectively. By adopting the tail gas connecting device of the SOFC system provided by the embodiment of the utility model, the problem of low fuel utilization rate in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell field, especially a kind of SOFC system tail gas connecting device. BACKGROUND

[0002] In SOFC system, the gas for being inhaled into electric pile to generate electricity usually has part of unreacted gas remaining, anode tail gas is fuel gas, and cathode tail is air. And in order to improve the utilization rate of reaction gas, anode tail gas and cathode tail gas after electric pile reaction are usually inhaled into combustor to burn, and the heat energy generated can be used to maintain the reaction temperature of electric pile, thereby improving the utilization efficiency of fuel.

[0003] In prior art, due to the gas passage of combustor does not match with electric pile, it is necessary to set up a separate mixing chamber to mix anode tail gas and cathode tail gas before inhaled into combustor to burn, but due to the temperature of tail gas is high, part of tail gas is combusted in the process of mixing in mixing chamber, thereby reducing the amount of gas inhaled into combustor and fuel utilization rate.

[0004] The electric pile tail gas connecting mode in prior art usually needs to set up a separate mixing chamber to mix anode tail gas and cathode tail gas, which results in that fuel is combusted before inhaled into combustor, thereby resulting in low fuel utilization rate. SUMMARY

[0005] The utility model embodiment provides a kind of SOFC system tail gas connecting device, can solve the problem of low fuel utilization rate in prior art.The technical solution is as follows:

[0006] A kind of SOFC system tail gas connecting device, comprising: electric pile and catalytic combustor,

[0007] The side of the electric pile is connected with the catalytic combustor, the electric pile includes multiple bipolar plates, multiple bipolar plates are arranged in horizontal stack, the catalytic combustor is provided with multiple longitudinal interval arrangement combustion holes on the side close to the electric pile, and multiple combustion holes are respectively plugged with multiple bipolar plates.

[0008] Optionally, sealing glue is arranged between the electric pile and the catalytic combustor, and the sealing glue is arranged around the combustion hole.

[0009] Optionally, the bipolar plate is in wave shape structure, the bipolar plate and the side wall of the combustion hole form gas passage and air passage, and the gas passage and the air passage are arranged towards the catalytic combustor.

[0010] Optionally, the stack further comprises an upper end plate, a lower end plate and a stud, the upper end plate is horizontally arranged on the top of the bipolar plate, the lower end plate is horizontally arranged on the bottom of the bipolar plate, and the stud is arranged through the upper end plate and the lower end plate.

[0011] Optionally, a plurality of studs are arranged in a rectangular array.

[0012] Optionally, a gas inlet and an air inlet are arranged on the upper end plate, the gas inlet is communicated with the gas channel, and the air inlet is communicated with the air channel.

[0013] Optionally, a catalyst is arranged in the combustion hole.

[0014] Optionally, a current collecting plate and a current collecting stud are arranged on the top and the bottom of the bipolar plate, the current collecting plate is horizontally arranged and connected with the bipolar plate, and the current collecting stud is vertically arranged and connected with the current collecting plate.

[0015] Optionally, a mica gasket is arranged on the side of the current collecting plate away from the bipolar plate.

[0016] Optionally, the mica gasket is arranged in multiple layers.

[0017] The technical scheme provided by the embodiment of the utility model has at least the following beneficial effects:

[0018] The SOFC system tail gas connecting device provided by the embodiment of the utility model has the following beneficial effects: the combustion hole matched with the bipolar plate is arranged on the catalytic combustor, one end of the bipolar plate is directly inserted into the combustion hole, the air and the fuel gas in the stack are directly introduced into the catalytic combustor for combustion after the electrochemical reaction, thus the air and the fuel gas do not need to be mixed in an additional mixing chamber, the possibility of combustion reaction of the fuel gas in the mixing chamber is reduced, all the fuel gas flowing out of the anode of the stack can be directly introduced into the catalytic combustor for combustion, the heat generated by the combustion is recycled, and the problem of low fuel utilization rate in the prior art is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the drawings without creative labor.

[0020] Figure 1 It is the overall structure schematic view provided by the embodiment of the utility model;

[0021] Figure 2 This is an exploded view of the overall structure provided in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the sealant and catalytic burner provided in this embodiment of the utility model;

[0023] Figure 4 This is a schematic front view of the overall structure provided in an embodiment of the present utility model;

[0024] Figure 5 This is provided by the embodiment of the present utility model. Figure 4 Schematic diagram of the cross-section at point AA;

[0025] Figure 6 This is provided by the embodiment of the present utility model. Figure 5 Enlarged view of point B;

[0026] Figure 7 This is a bottom view of the overall structure provided in an embodiment of the present utility model;

[0027] Figure 8 This is provided by the embodiment of the present utility model. Figure 7 A schematic diagram of the cross-section at point C;

[0028] Figure 9 This is provided by the embodiment of the present utility model. Figure 8 Enlarged diagram of point D.

[0029] In the diagram: 1-fuel stack; 11-bipolar plate; 111-gas passage; 112-air passage; 12-upper end plate; 121-gas inlet; 122-air inlet; 13-lower end plate; 14-stud; 2-catalytic burner; 21-combustion hole; 3-sealant; 41-current collector plate; 42-current collector column; 5-mica gasket. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model; Figure 2 This is an exploded view of the overall structure provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the sealant and catalytic burner provided in this embodiment of the utility model; Figure 4 This is a schematic front view of the overall structure provided in an embodiment of the present utility model; Figure 5 This is provided by the embodiment of the present utility model. Figure 4 Schematic diagram of the cross-section at point AA; Figure 6 This is provided by the embodiment of the present utility model. Figure 5Enlarged view of point B; Figure 7 This is a bottom view of the overall structure provided in an embodiment of the present utility model; Figure 8 This is provided by the embodiment of the present utility model. Figure 7 A schematic diagram of the cross-section at point C; Figure 9 This is provided by the embodiment of the present utility model. Figure 8 An enlarged diagram of point D. (See diagram below.) Figures 1 to 9 The SOFC system exhaust gas connection device shown includes: a fuel cell stack 1 and a catalytic combustor 2. One side of the fuel cell stack 1 is connected to the catalytic combustor 2. The fuel cell stack 1 includes multiple bipolar plates 11, which are horizontally stacked. The catalytic combustor 2 has multiple longitudinally spaced combustion holes 21 on the side near the fuel cell stack 1, and the multiple combustion holes 21 are respectively inserted and engaged with the multiple bipolar plates 11.

[0032] In an exemplary embodiment of this invention, the reacting gases in the SOFC system are fuel gas and air. The bipolar plate 11 within the fuel cell stack 1 separates the fuel gas and air, allowing the reacting gases to undergo an electrochemical reaction within the stack 1 to generate electricity. One end of the bipolar plate 11 is connected to the catalytic burner 2, and each bipolar plate 11 is plugged into each combustion hole 21, allowing the reacted fuel gas and air to converge within the combustion hole 21, thus enabling a combustion reaction to occur within the combustion hole 21. The heat generated is transferred to the fuel cell stack 1 through the catalytic burner 2, maintaining the temperature required for the electrochemical reaction within the stack 1. This ensures full utilization of the fuel gas introduced into the SOFC system. After power generation, all remaining fuel gas enters the catalytic burner 2 for combustion, thereby improving the utilization rate of the fuel gas.

[0033] This utility model provides an SOFC system exhaust gas connection device. By setting a combustion hole 21 on the catalytic burner 2 that matches the bipolar plate 11, and directly inserting one end of the bipolar plate 11 into the combustion hole 21, the air and fuel gas introduced into the fuel cell stack 1 can be directly introduced into the catalytic burner 2 for combustion after electrochemical reaction. This eliminates the need for an additional mixing chamber to mix the air and fuel gas, reducing the possibility of combustion reaction in the mixing chamber. As a result, all the fuel gas flowing out of the fuel cell stack anode can directly enter the catalytic burner 2 for combustion, thereby recovering and utilizing the heat generated by combustion. This effectively solves the problem of low fuel utilization in the prior art.

[0034] Optionally, a sealant 3 is provided between the fuel cell stack 1 and the catalytic burner 2, and the sealant 3 is provided around the combustion hole 21.

[0035] Exemplarily, in the embodiment of the utility model, through setting sealing glue 3 between electric pile 1 and catalytic combustor 2, make the abutment of bipolar plate 11 and combustion hole 21 more closely, prevent the gas leakage when the gas in bipolar plate 11 is passed into catalytic combustor 2, improve the sealing performance of the device by setting sealing glue 3, thereby further improve the utilization of fuel.

[0036] Optionally, the bipolar plate 11 is a wave-shaped structure, and the bipolar plate 11 and the side wall of the gas hole 21 form a gas passage 111 and an air passage 112, and the gas passage 111 and the air passage 112 are arranged towards the catalytic combustor 2.

[0037] Exemplarily, in the embodiment of the utility model, the bipolar plate 11 is designed as a wave-shaped structure, so that the part of the bipolar plate 11 in the electric pile 1 can be separated to form a gas passage 111 and an air passage 112 by its own structure, and the part of the bipolar plate 11 extending out of the electric pile 1 is abutted with the combustion hole 21, and the gas and air in the gas passage 111 and the air passage 112 are combined in the combustion hole 21 after abutment, so that combustion reaction and heat generation occur. By setting this structure, the structure is simple and convenient to operate, which not only makes the bipolar plate 11 play a role in separating gas and air in the electric pile, but also facilitates the combination of gas and air in the combustion hole 21, thereby improving the operation convenience of the device.

[0038] Optionally, the electric pile 1 further comprises an upper end plate 12, a lower end plate 13 and a stud 14, the upper end plate 12 is horizontally arranged at the top of the bipolar plate 11, the lower end plate 13 is horizontally arranged at the bottom of the bipolar plate 11, and the stud 14 passes through the upper end plate 12 and the lower end plate 13.

[0039] Exemplarily, in the embodiment of the utility model, the bipolar plate 11 is clamped by the upper end plate 12 and the lower end plate 13, so that the bipolar plate 11 is more stably fixed to form an integral structure, and the stud 14 is arranged between the upper end plate 12 and the lower end plate 13, and nuts are installed on both ends of the stud 14, so as to lock the upper end plate 12 and the lower end plate 13, and the upper end plate 12 and the lower end plate 13 provide stable clamping force to the bipolar plate 11, thereby improving the structural stability of the device.

[0040] Optionally, the stud 14 is provided with a plurality of studs 14, and the plurality of studs 14 are distributed in a rectangular array.

[0041] Exemplarily, in the embodiment of the utility model, by setting multiple studs 14, and the plurality of studs 14 are distributed in a rectangular array, the plurality of studs 14 can provide more stable fixing force to the upper end plate 12 and the lower end plate 13, so that the upper end plate 12 and the lower end plate 13 can clamp the bipolar plate 11 more stably, and the structural stability of the device is further improved.

[0042] Optionally, the upper end plate 12 is provided with a gas inlet 121 and an air inlet 122, the gas inlet 121 is communicated with the gas channel 111, and the air inlet 122 is communicated with the air channel 112.

[0043] Exemplarily, in the embodiment of the utility model, the gas inlet 121 and the air inlet 122 are arranged on the upper end plate 12, and the gas inlet 121 is communicated with the gas channel 111, and the air inlet 122 is communicated with the air channel 112, so that the gas and the air can be introduced into the electric pile 1 from the outside, and the operation convenience of the device is further improved by arranging the structure.

[0044] Optionally, the combustion hole 21 is provided with a catalyst.

[0045] Exemplarily, in the embodiment of the utility model, when the gas and the air are combusted in the combustion hole 21, the reaction efficiency may be too low to cause incomplete combustion of part of the gas, and the combustion reaction efficiency of the gas can be improved by arranging the catalyst in the combustion hole 21, so that the gas can be completely combusted in the combustion hole 21, thereby further improving the utilization rate of the gas.

[0046] Optionally, the top and the bottom of the bipolar plate 11 are provided with a current collecting plate 41 and a current collecting column 42, the current collecting plate 41 is horizontally arranged and connected with the bipolar plate 11, and the current collecting column 42 is vertically arranged and connected with the current collecting plate 41.

[0047] Exemplarily, in the embodiment of the utility model, the electric energy collected by the bipolar plate 11 can be concentrated by arranging the current collecting plate 41, the current collecting plate 41 can be fixed with the wiring terminal by arranging the current collecting column 42, and then the current is introduced to the load through the wire, so that the electric energy generated by the electric pile 1 can be directly used to power the external equipment, and the operation convenience of the device is further improved by arranging the structure.

[0048] Optionally, the side, away from the bipolar plate 11, of the current collecting plate 41 is provided with a mica gasket 5.

[0049] Exemplarily, in the embodiment of the utility model, the mica gasket 5 is a kind of high-temperature-resistant material and has a certain elasticity, and when the electric pile 1 reacts, a high temperature is needed, and when the electric pile 1 does not work, it returns to normal temperature, and the electric pile 1 usually expands and contracts due to the large temperature difference, and the deformation caused by the thermal expansion and contraction of the electric pile 1 can be absorbed and buffered by arranging the mica gasket 5, so that the structure of the device is more stable, and the structural stability of the device is further improved.

[0050] Optionally, the mica gasket 5 is provided with multiple layers.

[0051] Exemplarily, in the embodiment of the present application, the multi-layer mica gasket 5 is arranged, so that the multi-layer mica gasket 5 can simultaneously absorb the deformation of the stack 1, thereby further improving the structural stability of the device.

[0052] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms "first", "second", and similar terms used herein do not denote any order, quantity, or importance, but are used to distinguish different components. Similarly, the terms "one" or "a" or similar terms do not denote a quantity limitation, but denote the existence of at least one. The terms "include" or "contain" or similar terms mean that the elements or objects appearing before the terms "include" or "contain" cover the elements or objects listed after the terms "include" or "contain" and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like are used to represent relative positional relationships, which may change when the absolute position of the described object changes.

[0053] The above is only an optional embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A SOFC system tail gas connection apparatus, characterized by, The utility model relates to a kind of catalytic combustion device, including: Electric pile (1) and catalytic burner (2), The side of the electric pile (1) is connected with the catalytic burner (2), the electric pile (1) includes multiple bipolar plates (11), multiple bipolar plates (11) are arranged horizontally stacked, the catalytic burner (2) is provided with multiple longitudinal interval arrangement combustion holes (21) close to the side of the electric pile (1), multiple combustion holes (21) are respectively plugged with multiple bipolar plates (11).

2. The SOFC system tail gas connection apparatus according to claim 1, wherein Sealing glue (3) is arranged between the electric pile (1) and the catalytic burner (2), and the sealing glue (3) is arranged around the combustion hole (21).

3. The SOFC system tail gas connection apparatus according to claim 1, wherein The bipolar plate (11) is a wave-shaped structure, and the bipolar plate (11) and the side wall of the combustion hole (21) form a gas passage (111) and an air passage (112), and the gas passage (111) and the air passage (112) are arranged towards the catalytic burner (2).

4. The SOFC system tail gas connection apparatus according to claim 3, wherein The electric pile (1) further includes an upper end plate (12), a lower end plate (13) and a stud (14), the upper end plate (12) is horizontally arranged at the top of the bipolar plate (11), the lower end plate (13) is horizontally arranged at the bottom of the bipolar plate (11), and the stud (14) is arranged through the upper end plate (12) and the lower end plate (13).

5. The SOFC system tail gas connection apparatus according to claim 4, wherein Multiple studs (14) are arranged in a rectangular array.

6. The SOFC system tail gas connection apparatus according to claim 4, wherein The upper end plate (12) is provided with a gas inlet (121) and an air inlet (122), the gas inlet (121) is communicated with the gas passage (111), and the air inlet (122) is communicated with the air passage (112).

7. The SOFC system tail gas connection apparatus according to claim 1, wherein The combustion hole (21) is provided with a catalyst.

8. The SOFC system tail gas connection apparatus according to claim 1, wherein The top and bottom of the bipolar plate (11) are provided with a current collecting plate (41) and a current collecting column (42), the current collecting plate (41) is horizontally arranged and connected with the bipolar plate (11), and the current collecting column (42) is vertically arranged and connected with the current collecting plate (41).

9. The SOFC system tail gas connection apparatus of claim 8, wherein, The side of the current collecting plate (41) away from the bipolar plate (11) is provided with a mica gasket (5).

10. The SOFC system tail gas connection apparatus of claim 9, wherein, The mica gasket (5) is provided with multiple layers.

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