An ammonia fuel tubular solid oxide battery gas flow channel

Abstract

The utility model relates to fuel cell technical field especially ammonia fuel pipe type solid oxide battery group gas flow channel, including, electrode structure, it includes air inlet and gas outlet, and is located on the connecting portion of air inlet and gas outlet, still including the bending portion that is located on the connecting portion, the connecting portion on air inlet and the connecting portion on gas outlet are connected through the bending portion, owing to the setting of bending portion and gas outlet, gas will produce a reflux in the flowing process, ammonia enters the connecting portion through air inlet, along with ammonia decomposing into hydrogen and nitrogen gas in the pipe, gas volume expands, the gas produced can flow to gas outlet again through the guidance of bending portion, avoid the turbulence phenomenon under the traditional single axial gas supply mode, owing to avoiding the generation of turbulence phenomenon, the reactant on the electrode surface can be more evenly distributed, improves the overall power generation efficiency of battery.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, and in particular to a gas flow channel for an ammonia fuel tubular solid oxide battery pack. Background Technology

[0002] Traditional tubular solid oxide batteries typically employ a single-axial gas supply mode for fuel gas flow, without optimization for the high-temperature decomposition and gas production characteristics of ammonia fuel. After ammonia decomposes into hydrogen and nitrogen within the tube, the resulting gas volume expansion can lead to uneven pressure distribution, causing localized excessively high or low flow velocities. At the battery tube inlet, the flow rate of undecomposed ammonia is relatively slow, while as ammonia decomposes, the gas flow rate increases sharply, potentially causing turbulence at the outlet. This results in uneven distribution of reactants on the electrode surface, reducing the overall power generation efficiency of the battery.

[0003] To address this, a gas flow channel for an ammonia-fueled tubular solid oxide battery pack is proposed. Utility Model Content

[0004] In view of the problems existing in the above or prior art, this utility model is proposed.

[0005] Therefore, the purpose of this invention is to provide a gas flow channel for an ammonia fuel tubular solid oxide battery pack.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a gas flow channel for an ammonia fuel tubular solid oxide battery pack, comprising,

[0007] An electrode structure includes an air inlet and an air outlet, and a connecting portion provided on the air inlet and the air outlet, and also includes a bent portion provided on the connecting portion;

[0008] The connecting part on the air inlet and the connecting part on the air outlet are connected by a bend.

[0009] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, the inlet and outlet are both Y-shaped structures, and each inlet and outlet is connected to two connecting parts.

[0010] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, wherein the cross-section of the inlet end of the inlet is smaller than the cross-section of the outlet end.

[0011] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, the cross-section of the gas outlet end is smaller than the cross-section of the gas inlet end.

[0012] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, it further includes an upper fixed base, and the air inlet and the air outlet are disposed in the upper fixed base.

[0013] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, wherein: the upper fixed seat is provided with a first honeycomb hole.

[0014] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, it further includes a lower fixing seat, and the curved portion is disposed within the lower fixing seat.

[0015] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, the lower fixed base is provided with a second honeycomb hole.

[0016] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, it further includes a connecting seat, on which a connecting pipe is provided, and the connecting seat can connect multiple connecting parts by means of the connecting pipe.

[0017] As a preferred embodiment of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model, the connecting seat is provided with a third honeycomb hole.

[0018] The beneficial effects of the gas flow channel of the ammonia fuel tubular solid oxide battery pack of this utility model are as follows: Due to the setting of the bend and the gas outlet, the gas will generate a backflow during the flow process. Ammonia enters the connecting part through the gas inlet. As the ammonia decomposes into hydrogen and nitrogen in the tube, the gas volume expands. The generated gas can be guided by the bend to flow back to the gas outlet, avoiding the turbulence phenomenon caused by the traditional single axial gas supply mode. Since the generation of turbulence is avoided, the reactants on the electrode surface can be more evenly distributed, improving the overall power generation efficiency of the battery. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the gas flow channel of an ammonia fuel tubular solid oxide battery pack, as shown in Example 1.

[0021] Figure 2 This is a schematic diagram of the electrode structure of the gas flow channel in an ammonia fuel tubular solid oxide battery pack.

[0022] Figure 3 This is a schematic diagram of the gas flow channel of an ammonia fuel tubular solid oxide battery pack, as shown in Example 2.

[0023] Figure 4 This is a first cross-sectional view of the gas flow channel of an ammonia fuel tubular solid oxide battery pack, as shown in Example 2.

[0024] Figure 5 This is a second cross-sectional view of the gas flow channel of an ammonia fuel tubular solid oxide battery pack, as shown in Example 2.

[0025] Figure 6 This is a cross-sectional schematic diagram of the connector for the gas flow channel of an ammonia fuel tubular solid oxide battery pack.

[0026] Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0027] In the figure: 1. Electrode structure; 11. Air inlet; 12. Connecting part; 13. Bending part; 14. Air outlet; 2. Upper fixing seat; 21. First honeycomb hole; 3. Lower fixing seat; 31. Second honeycomb hole; 4. Connecting seat; 41. Connecting pipe; 42. Third honeycomb hole; 10. Oxygen electrode; 20. Barrier layer; 30. Electrolyte; 40. Ammonia electrode functional layer; 50. Ammonia electrode support layer. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0031] Example 1, referring to Figures 1 to 2This is the first embodiment of the present invention. This embodiment provides a gas flow channel for an ammonia fuel tubular solid oxide battery pack, including an electrode structure 1, which includes an air inlet 11 and an air outlet 14, and a connecting portion 12 provided on the air inlet 11 and the air outlet 14, and also includes a bent portion 13 provided on the connecting portion 12; the connecting portion 12 on the air inlet 11 and the connecting portion 12 on the air outlet 14 are connected by the bent portion 13.

[0032] When in use, ammonia fuel enters from the inlet 11 of the battery tube, passes through the connecting part 12 connected to the inlet 11, and is guided by the bend 13 to the connecting part 12 connected to the outlet 14, and finally flows out from the outlet 14.

[0033] Due to the design of the bend 13 and the outlet 14, a backflow occurs during gas flow. Ammonia enters the connector 12 through the inlet 11. As the ammonia decomposes into hydrogen and nitrogen in the pipe, the gas volume expands. The generated gas can be guided by the bend 13 and flow back to the outlet 14, avoiding the turbulence phenomenon caused by the traditional single axial gas supply mode. Since the generation of turbulence is avoided, the reactants on the electrode surface can be more evenly distributed, improving the overall power generation efficiency of the battery.

[0034] Because ammonia decomposes into hydrogen and nitrogen during operation, as the mixed gas flows axially, the oxidant air or oxygen outside the pipe comes into contact with the outer wall electrode in a gradient diffusion manner. The gas concentration is higher near the air inlet 11, and the diffusion driving force is greater. As the distance increases, the concentration gradually decreases and the diffusion rate slows down.

[0035] In addition, due to the reflux structure and increased path, the reaction time and contact area of ​​ammonia will increase, enabling more thorough decomposition and improving fuel utilization.

[0036] Specifically, both the air inlet 11 and the air outlet 14 have a Y-shaped structure, and each air inlet 11 and air outlet 14 is connected to two connecting parts 12.

[0037] Furthermore, the cross-section of the air inlet 11 is smaller than the cross-section of the air outlet.

[0038] Among them, the cross-section of the air outlet 14 at the air outlet end is smaller than the cross-section of the air inlet end.

[0039] Reference Figure 2 When ammonia enters from the inlet end of the inlet 11, it will be split. Due to the increase in the cross-sectional area after the split, the flow rate of ammonia can be reduced to accommodate the expansion of the gas volume after ammonia decomposition. This avoids the phenomenon of excessive gas flow rate and excessive pressure in the connection part 12 caused by gas expansion during decomposition.

[0040] Preferably, it also includes an upper fixing seat 2, with the air inlet 11 and the air outlet 14 disposed inside the upper fixing seat 2, and the upper fixing seat 2 is used to fix the air inlet 11 and the air outlet 14.

[0041] It should be noted that the upper fixed base 2 is provided with a first honeycomb hole 21. The first honeycomb hole 21 can reduce the mass of the structure while maintaining its strength, and facilitate the flow of gas.

[0042] It also includes a lower fixing seat 3, and the bent part 13 is disposed in the lower fixing seat 3; the lower fixing seat 3 is provided with a second honeycomb hole 31. The lower fixing seat 3 is used to fix the bent part 13. The setting of the second honeycomb hole 31 can reduce the mass of the structure while maintaining the strength, and facilitate the flow of gas.

[0043] Example 2, refer to Figures 2-7 This is the second embodiment of the present invention. Unlike the previous embodiment, it also includes a connecting seat 4. The connecting seat 4 is provided with a connecting pipe 41. The connecting seat 4 can connect multiple connecting parts 12 through the connecting pipe 41. According to actual usage requirements, multiple connecting parts 12 can be connected through the connecting pipe 41 to control the length of the entire gas flow channel.

[0044] Specifically, the connecting seat 4 is provided with a third honeycomb hole 42. The setting of the third honeycomb hole 42 can reduce the mass of the structure while maintaining its strength, and facilitate the flow of gas.

[0045] The rest of the structure is the same as in Example 1.

[0046] It should be noted that the connecting part 12 is composed of an oxygen electrode 10, a barrier layer 20, an electrolyte 30, an ammonia electrode functional layer 40, and an ammonia electrode support layer 50.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Images