Stack air inlet device of SOFC (Solid Oxide Fuel Cell) system

Abstract

The utility model relates to the technical field of solid oxide fuel cells, in particular to an SOFC (solid oxide fuel cell) system electric pile air inlet device which comprises an outer shell and an inner shell, the outer shell is connected with an air pipeline and a gas pipeline, the inner shell is arranged inside the outer shell, a heat exchange cavity is formed between the inner shell and the outer shell, a heat dissipation piece is arranged on the outer surface of the inner shell, and the heat dissipation piece is connected with the inner shell. An air inlet and a fuel gas inlet are formed in the inner shell, an electric pile is arranged in the inner shell, the electric pile is connected with an anode pipeline and a cathode pipeline, the fuel gas pipeline is connected with the anode pipeline through the fuel gas inlet, and the air pipeline, the heat exchange cavity, the air inlet and the cathode pipeline are sequentially communicated. According to the utility model, the utilization rate of waste heat generated by the galvanic pile is improved, and the cost of a galvanic pile heating subsystem is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to solid oxide fuel cell technical field, concretely relates to a SOFC system electric pile air inlet device. BACKGROUND

[0002] Solid oxide fuel cell refers to the fuel cell using solid oxide as electrolyte and working at high temperature, and its principle is that fuel molecules (such as hydrogen) of anode are oxidized in catalytic layer, release electrons, oxygen molecules of cathode enter catalytic layer and are reduced into oxygen ions after accepting electrons from anode, and the process that the electrons released by anode return to cathode through external circuit will form electric current, then, oxygen ions migrate from cathode to anode in electrolyte and react with fuel, and this process will generate heat, in addition, fuel of anode that is not completely reacted and oxygen of cathode will be introduced into combustor to burn, and heat will also be generated. At present, for the waste heat generated by electric pile itself, tail gas generated by electric pile is usually utilized through heat exchanger, the utilization rate is low, and part of heat cannot be effectively utilized, for example, the Chinese utility model patent with the authorization announcement number CN211404640U. SUMMARY

[0003] The utility model discloses to the defects of prior art, provide a kind of SOFC system electric pile air inlet device, improve the utilization rate of waste heat generated by electric pile itself, it is also favorable to reduce the cost of electric pile heating subsystem.

[0004] In order to solve the above technical problems, the utility model provides a kind of SOFC system electric pile air inlet device, including shell and inner shell, the shell is connected with air pipe and gas pipe, the inner shell is arranged in shell interior, heat exchange cavity is formed between the inner shell and shell, the outer surface of the inner shell is provided with heat dissipation piece, air inlet and gas inlet are set on the inner shell, the electric pile is set in the inner shell, the electric pile is connected with anode pipe and cathode pipe, the gas pipe is connected with anode pipe by gas inlet, the air pipe, heat exchange cavity, air inlet, cathode pipe are sequentially communicated.

[0005] In some embodiments, the inner shell is provided with a partition plate, the inner shell is connected with the shell through the partition plate, the partition plate separates the heat exchange cavity into a plurality of heat exchange cavity units, a through hole is formed in the partition plate, and the plurality of heat exchange cavity units are connected in series through the through hole.

[0006] In some embodiments, the air pipe is directly communicated with the first heat exchange cavity unit of the plurality of heat exchange cavity units, and the air inlet is directly communicated with the last heat exchange cavity unit of the plurality of heat exchange cavity units.

[0007] In some embodiments, the heat dissipating member comprises a plurality of heat dissipating plates, and the plurality of heat dissipating plates are evenly arranged on the outer surface of the inner shell.

[0008] In some embodiments, the heat dissipating plates are arranged parallel to the flow direction of the gas in the heat exchange cavity.

[0009] In some embodiments, the heat dissipating member is arranged with a gap from the inner wall of the outer shell.

[0010] In some embodiments, the partition plate divides the heat exchange cavity into two heat exchange cavity units, which are a first heat exchange cavity unit and a second heat exchange cavity unit.

[0011] In some embodiments, the air inlet is arranged at the right end of the inner shell, the air duct is arranged at the right end of the outer shell, the air inlet directly communicates with the second heat exchange cavity unit, the air duct directly communicates with the first heat exchange cavity unit, and the through hole is arranged at the left end of the inner shell.

[0012] In some embodiments, the partition plate is welded to the inner wall of the outer shell.

[0013] In some embodiments, a heat insulation layer is arranged on the inner wall of the outer shell.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model sets the outer shell and the inner shell, and the heat generated by the electric pile in the inner shell is directly conducted to the heat exchange cavity through the heat dissipating member. The gas enters the electric pile in the inner shell through the air duct of the outer shell, and is preheated in the heat exchange cavity, so that the waste heat of the electric pile is fully utilized.

[0016] 2. The present utility model sets the partition plate on the inner shell, which can fix the inner shell and separate the heat exchange cavity, so as to increase the heat exchange time of the gas in the heat exchange cavity.

[0017] 3. The air duct of the present utility model directly communicates with the first heat exchange cavity unit of the plurality of heat exchange cavity units, and the air inlet directly communicates with the last heat exchange cavity unit of the plurality of heat exchange cavity units, so as to increase the travel of the gas and ensure that the gas fully absorbs the waste heat generated by the electric pile.

[0018] 4. The heat dissipating member of the present utility model adopts the heat dissipating plate, and the arrangement direction of the heat dissipating plate is parallel to the flow direction of the gas in the heat exchange cavity, which reduces the flow resistance of the gas and makes the gas transfer more uniform. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a structural schematic view of the outer shell of the present utility model;

[0020] Figure 2It is the structure schematic view of the inner shell of the utility model.

[0021] Figure 3 It is the front view of the inner shell of the utility model.

[0022] Figure 4 It is the structure schematic view of the electric pile of the utility model.

[0023] Figure 5 It is the airflow flow direction view of the utility model.

[0024] Figure 6 It is the arrangement schematic view of the heat dissipation plate of the inner shell in the shell.

[0025] Reference signs: shell 1;Air duct 11;

[0026] Inner shell 2;Air inlet 21;Heat dissipation piece 22;Partition 23;Through hole 231;

[0027] Heat exchange cavity 3;First heat exchange cavity unit 31;Second heat exchange cavity unit 32;

[0028] Electric pile 4;Cathode duct 41;Combustion chamber 42. DETAILED DESCRIPTION

[0029] In order to make the technical problem, technical scheme and beneficial effect of the present application more clearly understood, the present application is further described in detail below in combination with the drawings and examples.It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0030] The utility model provides a kind of SOFC system electric pile air inlet device, including shell 1 and inner shell 2, as shown in Figure 1 As shown, shell 1 is connected with air duct 11 and gas duct, as shown in Figure 5 Inner shell 2 is arranged in shell 1, and heat exchange cavity 3 is formed between inner shell 2 and shell 1, as shown in Figure 2 The outer surface of inner shell 2 is provided with heat dissipation piece 22, air inlet 21 and gas inlet are opened on inner shell 2, and electric pile 4 is arranged in inner shell 2, as shown in Figure 4 As shown, electric pile 4 is connected with anode duct and cathode duct 41, gas duct is connected with anode duct through gas inlet, and air duct 11, heat exchange cavity 3, air inlet 21 and cathode duct 41 are sequentially communicated.

[0031] It can be understood that the fuel gas directly enters the stack 4 through the fuel gas pipeline, the fuel gas inlet, and the anode pipeline, and the air enters the stack 4 through the air pipeline 11, the heat exchange cavity 3, the air inlet 21, and the cathode pipeline 41. Since the outer surface of the inner shell 2 is provided with the heat dissipation member 22, the heat generated by the stack 4 can be rapidly transmitted to the heat exchange cavity 3 through the heat dissipation member 22, and the outer shell 1 can reduce the heat loss, and the air can be preheated in the heat exchange cavity 3, so that the heat generated by the stack 4 is fully utilized.

[0032] In addition, the outer shell 1 is connected with the tail gas pipeline, the inner shell 2 is provided with a tail gas outlet, the stack 4 comprises a combustion chamber 42 and a tail gas bin, the tail gas bin is connected with the tail gas pipeline through a pipeline penetrating through the inner shell 2, and the pipeline connecting the tail gas bin and the tail gas pipeline can be arranged in a zigzag shape or other shapes in the heat exchange cavity 3, so that the heat of the tail gas is fully transmitted to the heat exchange cavity 3.

[0033] It should be noted that the air inlet device of the utility model is mainly used for preheating the gas of the cathode, Figure 1 the fuel gas pipeline and the tail gas pipeline are not shown in the figure, Figure 2 the fuel gas inlet and the tail gas outlet are not shown in the figure, Figure 4 and the anode pipeline is not shown in the figure. The fuel gas pipeline and the tail gas pipeline can be arranged at any position of the outer shell 1 as required, the anode pipeline is connected to the anode side of the stack 4, and the air pipeline 11 is used for transmitting the gas corresponding to the cathode of the stack 4, for example, air.

[0034] In some embodiments, as shown in Figure 2 , 3 the inner shell 2 is provided with a partition plate 23, the inner shell 2 is connected with the outer shell 1 through the partition plate 23, the partition plate 23 divides the heat exchange cavity 3 into a plurality of heat exchange cavity units, a through hole 231 is formed in the partition plate 23, and the plurality of heat exchange cavity units are connected in series through the through hole 231.

[0035] The partition plate 23 can fix the inner shell 2 and divide the heat exchange cavity 3, so that the heat exchange time of the gas in the heat exchange cavity 3 can be increased. The partition plate 23 can divide the heat exchange cavity 3 into heat exchange cavity units connected in turn around the inner shell 2, or divide the heat exchange cavity into multiple layers, each layer of the heat exchange cavity 3 comprises a plurality of heat exchange cavity units, and adjacent two layers of the heat exchange cavity 3 are communicated, so that the heat exchange time of the air in the heat exchange cavity 3 is further increased.

[0036] Figure 5 , 6 two heat exchange cavity units are shown in the figure, Figure 5 the arrow in the figure represents the flow direction of the air, the partition plate 23 divides the heat exchange cavity 3 into two heat exchange cavity units, and the two heat exchange cavity units are a first heat exchange cavity unit 31 and a second heat exchange cavity unit 32.

[0037] In some embodiments, the air duct 11 is directly connected to the first heat exchange chamber unit among the plurality of heat exchange chamber units, and the air inlet 21 is directly connected to the last heat exchange chamber unit among the plurality of heat exchange chamber units.

[0038] Figure 5 The diagram illustrates the connection between the air inlet 21 and the air duct 11 when two heat exchange chamber units are set up. The air inlet 21 is located at the right end of the inner shell 2, and the air duct 11 is located at the right end of the outer shell 1. The air inlet 21 is directly connected to the second heat exchange chamber unit 32, and the air duct 11 is directly connected to the first heat exchange chamber unit 31. The through hole 231 is arranged at the left end of the inner shell 2.

[0039] Understandably, with the above arrangement, the air entering the heat exchange chamber 3 has the longest travel distance and the longest heat exchange time, allowing the air to fully absorb heat.

[0040] In some embodiments, such as Figure 2 As shown, the heat sink 22 includes multiple heat sinks, which are evenly arranged on the outer surface of the inner shell 2. The heat sinks are narrow, elongated strips and are located on the top, bottom, left, and right sides of the inner shell 2.

[0041] In some embodiments, such as Figure 2 , 5 As shown, the heat sink is arranged parallel to the gas flow direction in the heat exchange chamber 3.

[0042] Understandably, the heat sinks are arranged parallel to the gas flow direction in the heat exchange chamber 3, which reduces the gas flow resistance, and multiple heat sinks can act as gas channels, making the gas transfer more uniform.

[0043] In some embodiments, such as Figure 6 As shown, a gap is provided between the heat sink 22 and the inner wall of the outer casing 1 to prevent heat from being transferred between the heat sink 22 and the outer casing 1, which helps to reduce heat loss.

[0044] In some embodiments, the partition 23 is welded to the inner wall of the outer casing 1.

[0045] In some embodiments, a heat insulation layer is provided on the inner wall of the outer casing 1. The heat insulation layer may be made of a heat insulation material that is resistant to high temperatures (e.g., 1000°C), such as ceramic fiber material.

[0046] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A SOFC system stack gas inlet device characterized by: The application relates to a heat exchange type fuel cell, which comprises an outer shell (1) connected with an air duct (11) and a gas duct, and an inner shell (2) arranged inside the outer shell (1), a heat exchange cavity (3) being formed between the inner shell (2) and the outer shell (1), the outer surface of the inner shell (2) being provided with a heat radiating member (22), air inlets (21) and gas inlets being formed in the inner shell (2), an electric pile (4) being arranged in the inner shell (2), the electric pile (4) being connected with anode ducts and cathode ducts (41), the gas duct being connected with the anode ducts through the gas inlets, the air duct (11), the heat exchange cavity (3), the air inlets (21) and the cathode ducts (41) being sequentially communicated.

2. The SOFC system stack gas inlet device of claim 1, wherein: The inner shell (2) is connected with the outer shell (1) through a partition plate (23), the partition plate (23) divides the heat exchange cavity (3) into multiple heat exchange cavity units, and a through hole (231) is formed in the partition plate (23), so that the multiple heat exchange cavity units are communicated in series through the through hole (231).

3. The SOFC system stack gas inlet device of claim 2, wherein: The air duct (11) is directly communicated with a first heat exchange cavity unit of the multiple heat exchange cavity units, and the air inlets (21) are directly communicated with a last heat exchange cavity unit of the multiple heat exchange cavity units.

4. The SOFC system stack gas inlet device of any one of claims 1 to 3, characterized by: The heat radiating member (22) comprises multiple heat radiating plates, and the multiple heat radiating plates are uniformly arranged on the outer surface of the inner shell (2).

5. The SOFC system stack gas inlet device of claim 4, wherein: The heat radiating plates are arranged parallel to the gas flow direction in the heat exchange cavity (3).

6. The SOFC system stack gas inlet device of any one of claims 1 to 3, characterized by: The heat radiating member (22) is provided with a gap with the inner wall of the outer shell (1).

7. The SOFC system stack gas inlet device of claim 3, wherein: The partition plate (23) divides the heat exchange cavity (3) into two heat exchange cavity units, which are a first heat exchange cavity unit (31) and a second heat exchange cavity unit (32) respectively.

8. The SOFC system stack gas inlet device of claim 7, wherein: The air inlets (21) are formed at the right end of the inner shell (2), the air duct (11) is arranged at the right end of the outer shell (1), the air inlets (21) are directly communicated with the second heat exchange cavity unit (32), the air duct (11) is directly communicated with the first heat exchange cavity unit (31), and the through hole (231) is arranged at the left end of the inner shell (2).

9. The SOFC system stack gas inlet apparatus according to any one of claims 2 or 3, characterized by: The partition plate (23) is welded with the inner wall of the outer shell (1).

10. The SOFC system stack gas inlet device of any one of claims 1 to 3, characterized by: An insulating layer is arranged on the inner wall of the outer shell (1).

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