Waste gas and fuel integrated treatment assembly of solid oxide fuel cell system

Abstract

The invention relates to a waste gas and fuel integrated treatment assembly of a solid oxide fuel cell system, which comprises an outer cylinder and a combustion cylinder, the combustion cylinder is arranged in the outer cylinder, a uniform distribution cylinder is arranged in the middle of the top wall of the combustion cylinder in a penetrating manner, a first layer of uniform distribution plate and a second layer of uniform distribution plate are arranged on the inner wall of the uniform distribution cylinder, and uniform distribution holes are formed in the first layer of uniform distribution plate and the second layer of uniform distribution plate; a plurality of streaming inclined holes are formed in the top wall of the combustion cylinder and distributed around the uniform distribution cylinder, an annular baffle is arranged on the outer wall of the combustion cylinder, the outer edge of the annular baffle is connected with the inner wall of the outer cylinder, and a cathode waste gas main inlet hole, a cathode waste gas supplementing inlet hole and a cooling mixing inlet hole are formed in the outer wall of the combustion cylinder. And the distances between the cathode waste gas main inlet hole, the cathode waste gas supplementing inlet hole and the cooling and mixing inlet hole and the uniform distribution cylinder are sequentially increased. According to the invention, the heat energy of the cathode waste gas and the anode waste gas can be more thoroughly recovered, the structure of the solid oxide fuel cell system is simplified, and the overall efficiency of the solid oxide fuel cell system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas and fuel treatment of solid oxide fuel cells (SOFCs), and in particular to an integrated waste gas and fuel treatment structure of a solid oxide fuel cell system. Background Art

[0002] The exhaust gas and fuel treatment device of solid oxide fuel cell (SOFC) is designed to improve energy efficiency and reduce harmful emissions, that is, to achieve the following two goals: 1. Waste gas energy recovery: The waste gas discharged from the SOFC stack has a high temperature. This part of energy can be recovered through devices such as heat exchangers and used for heating or other thermodynamic processes, thereby improving the overall energy efficiency of the system.

[0003] 2. Exhaust gas purification: The exhaust gas treatment device needs to effectively remove pollutants in the exhaust gas discharged by the fuel cell stack, including but not limited to incompletely burned fuel components, nitrogen oxides (NOx), sulfides (SOx), etc. This requires the use of specific catalysts to convert these pollutants and reduce the concentration of pollutants at the system outlet to reach the emission standard concentration. The problems and shortcomings of the exhaust gas and fuel treatment devices of solid oxide fuel cells (SOFC) in the prior art mainly include the following aspects: 1. Thermal management issues: SOFC systems operate in high-temperature environments, and the exhaust gases from the anode and cathode have very high temperatures. How to effectively manage and recycle this heat energy and prevent thermal stress from damaging system components is currently a major challenge; 2. Difficulty in system integration: The exhaust gas treatment system needs to be closely integrated with the fuel treatment system, which requires the compatibility and coordination of the two to be considered in the design, thus increasing the difficulty of system integration 3. Many components: SOFC systems are usually composed of multiple subsystems, including fuel supply system, air supply system, thermal management system, fuel treatment system and exhaust gas treatment system, etc. This leads to a complex structure of the entire system, requiring more components to realize various functions, increasing the complexity and cost of the system.

[0004] 4. Low efficiency: Although SOFC itself has a high power conversion efficiency, in actual applications, due to the connection loss between the components in the system, heat loss and other non-ideal factors, the overall efficiency may be reduced. Especially when the exhaust gas treatment and fuel treatment systems are not well optimized, this part of the loss may be more obvious.

[0005] 5. Low space utilization: The complex exhaust gas treatment system and fuel treatment system occupy a large space of SOFC. Summary of the invention

[0006] The purpose of the present invention is to provide an integrated exhaust gas and fuel treatment structure for a solid oxide fuel cell system, which can more thoroughly recover the heat energy of the two, simplify the structure of the solid oxide fuel cell system, and improve the overall efficiency of the solid oxide fuel cell system.

[0007] To achieve the above object, the present invention provides the following technical solutions: The exhaust gas and fuel integrated processing component of the solid oxide fuel cell system includes an outer tube and a combustion tube, the combustion tube is arranged in the outer tube, a uniform distribution tube is penetrated in the middle of the top wall of the combustion tube, a first uniform distribution plate and a second uniform distribution plate are arranged on the inner wall of the uniform distribution tube, the first uniform distribution plate and the second uniform distribution plate are both provided with uniform distribution holes, a plurality of flow-around inclined holes are arranged on the top wall of the combustion tube, and the plurality of flow-around inclined holes are distributed around the uniform distribution tube, an annular baffle is arranged on the outer wall of the combustion tube, the outer edge of the annular baffle is connected to the inner wall of the outer tube, and a cathode exhaust gas main air inlet hole, a cathode exhaust gas supplementary air inlet hole and a cooling mixing air inlet hole are arranged on the outer wall of the combustion tube, The distances between the cathode exhaust gas main air inlet, the cathode exhaust gas supplementary air inlet and the cooling mixing air inlet and the uniformly distributed cylinder increase successively. The height position of the annular baffle is lower than the cooling mixing air inlet. An igniter is arranged between the cathode exhaust gas main air inlet and the second-layer uniformly distributed plate. An outer cover is arranged on the outer wall of the outer cylinder. The upper part of the inner cavity of the outer cover is divided into a fuel air inlet cavity and a water inlet cavity. The fuel air inlet cavity is provided with a fuel air inlet port, the water inlet cavity is provided with a water inlet port, heat exchange fins are arranged in the fuel air inlet cavity, porous metal is arranged in the water inlet cavity, a mixing vane is arranged at the lower part of the outer wall of the outer cylinder, and a mixed gas outlet is arranged at the lower part of the outer cover.

[0008] Specifically, the angle between the central axis of the flow-around inclined hole and the top wall of the combustion tube is 25°-45°, and the projection of the central axis of the flow-around inclined hole on the top wall of the combustion tube is along the circumferential tangent direction.

[0009] Specifically, the first-layer uniformly distributed plate is provided with a row of first-layer uniformly distributed holes distributed in an annular shape, and the second-layer uniformly distributed plate is provided with a row of second-layer uniformly distributed holes distributed in an annular shape. The number of the first-layer uniformly distributed holes is less than that of the second-layer uniformly distributed holes, and the spacing between the first-layer uniformly distributed holes is larger than that of the second-layer uniformly distributed holes.

[0010] Specifically, the aperture of the cathode exhaust gas main intake hole is larger than that of the cathode exhaust gas supplementary intake hole and the cooling mixing intake hole.

[0011] Specifically, two symmetrical notches are provided on the upper part of the outer cover, and partition strips are welded at the notches. The two partition strips divide the upper part of the inner cavity of the outer cover into a fuel air inlet cavity and a water inlet cavity, and the igniter is arranged through one of the partition strips.

[0012] Specifically, an arc-shaped air equalizing plate is provided at the upper part of the fuel intake cavity, and the arc-shaped air equalizing plate is provided with air equalizing holes. The arc-shaped air equalizing plate divides the upper part of the fuel intake cavity into an intake equalizing cavity, and the fuel intake port is provided in the intake equalizing cavity.

[0013] Specifically, the cross section of the heat exchange fin is in the shape of a square wave signal, multiple inner walls of the heat exchange fin are all in contact with the outer wall of the outer tube, and multiple outer walls of the heat exchange fin are all in contact with the inner wall of the outer cover.

[0014] Specifically, the material of the heat exchange fin is aluminum alloy, the thickness of the heat exchange fin is 0.3mm-0.5mm, the circumferential pitch of the heat exchange fin is 2.3mm-2.7mm, and the radial height of the heat exchange fin is 7mm-9mm.

[0015] Specifically, an arc-shaped liquid equalizing sheet is provided at the upper part of the water inlet cavity, and a liquid equalizing hole is provided on the arc-shaped liquid equalizing sheet. The arc-shaped liquid equalizing sheet divides the upper part of the water inlet cavity into a water inlet equalizing cavity, and the water inlet is provided in the water inlet equalizing cavity.

[0016] Specifically, the porous metal is provided with a plurality of circumferential holes, a plurality of radial holes and a plurality of vertical holes, and the corresponding circumferential holes, radial holes and vertical holes are connected inside the porous metal.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The anode exhaust gas (mainly hydrogen, carbon monoxide, and methane) and the cathode exhaust gas (mainly nitrogen and oxygen) are fully mixed in the above-mentioned combustion area and then ignited, so that the two are fully burned, thereby releasing the chemical energy of the anode exhaust gas and the cathode exhaust gas, so that the heat energy of the two can be more thoroughly recovered; 2. The anode exhaust gas (mainly hydrogen, carbon monoxide, and methane) and the cathode exhaust gas (mainly nitrogen and oxygen) are fully mixed in the above-mentioned combustion area and ignited before being discharged, which can reduce the emission concentration of the anode exhaust gas and the cathode exhaust gas, which is beneficial to environmental protection; 3. Heat exchange fins and porous metal are arranged on both sides of the outer wall of the outer tube. The heat exchange fins exchange heat with the fuel gas (mainly methane) flowing through. The porous metal exchanges heat with the deionized water flowing through, causing the ionized water to evaporate into water vapor. The heated fuel gas and water vapor reach the reaction conditions and react to form hydrogen and carbon monoxide. This process absorbs and utilizes the heat of the anode exhaust gas and the cathode exhaust gas themselves, as well as the heat generated by the combustion of the two, to reduce the temperature of the mixed gas discharged from the lower end of the combustion tube. Furthermore, the cathode exhaust gas entering through the cooling mixing air inlet hole is mixed with the high-temperature gas after combustion, which also plays a role in reducing the temperature of the mixed gas discharged from the lower end of the combustion tube. By reducing the temperature of the exhaust gas, the damage to the system components caused by thermal stress can be reduced; 4. Integrating the anode exhaust gas treatment system, cathode exhaust gas treatment system and fuel treatment system can greatly reduce the original connection loss and heat loss, thereby greatly improving the overall efficiency of the solid oxide fuel cell (SOFC). In addition, it greatly simplifies the system structure and greatly reduces the space it occupies. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is an external view of the present invention; Figure 2 It is a cutaway view of the present invention; Figure 3 It is a partial perspective view of the present invention; Figure 4 It is a cross-sectional view of the uniformly distributed cylinder; Figure 5 A view of the top wall of the combustion tube.

[0020] In the figure: 6. Ignitor; 8. Outer tube; 81. Mixing rotor; 10. Outer cover; 101. Mixed gas outlet; 102. Notch; 11. Heat exchange fins; 12. Fuel inlet cavity; 121. Fuel inlet port; 122. Arc-shaped gas equalizing plate; 123. Inlet gas equalizing cavity; 13. Water inlet cavity; 131. Water inlet port; 132. Arc-shaped liquid equalizing plate; 133. Inlet water equalizing cavity; 14. Distributor tube; 141. One-layer distributed plate; 142. Two-layer distributed plate; 16. Combustion tube; 161. Flow-around inclined hole; 162. Annular baffle; 17. Cathode exhaust main inlet port; 18. Porous metal; 19. Cathode exhaust supplementary inlet port; 20. Cooling mixing inlet port; 27. Separator strip. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See Figures 1 to 5 The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system includes an outer tube 8 and a combustion tube 16. The combustion tube 16 is arranged in the outer tube 8. A uniform distribution tube 14 is penetrated in the middle of the top wall of the combustion tube 16. The inner wall of the uniform distribution tube 14 is provided with a first uniform distribution plate 141 and a second uniform distribution plate 142. The first uniform distribution plate 141 and the second uniform distribution plate 142 are both provided with uniform distribution holes.

[0023] The top wall of the combustion tube 16 is provided with a plurality of flow-around oblique holes 161, and the plurality of flow-around oblique holes 161 are distributed around the uniformly distributed tube 14. The outer wall of the combustion tube 16 is provided with an annular baffle 162, and the outer edge of the annular baffle 162 is connected to the inner wall of the outer tube 8. The outer wall of the combustion tube 16 is provided with a cathode exhaust gas main inlet hole 17, a cathode exhaust gas supplementary inlet hole 19 and a cooling and mixing inlet hole 20, and the distances between the cathode exhaust gas main inlet hole 17, the cathode exhaust gas supplementary inlet hole 19 and the cooling and mixing inlet hole 20 and the uniformly distributed tube 14 increase in sequence. The height position of the annular baffle 162 is lower than the cooling and mixing inlet hole 20.

[0024] An igniter 6 is provided between the cathode exhaust main air inlet 17 and the second-layer uniform distribution plate 142. An outer cover 10 is provided on the outer wall of the outer tube 8. The upper part of the inner cavity of the outer cover 10 is divided into a fuel air inlet cavity 12 and a water inlet cavity 13. The fuel air inlet cavity 12 is provided with a fuel air inlet port 121. The water inlet cavity 13 is provided with a water inlet port 131. Heat exchange fins 11 are provided in the fuel air inlet cavity 12. Porous metal 18 is provided in the water inlet cavity 13. A mixing rotor 81 is provided at the lower part of the outer wall of the outer tube 8. A mixed gas outlet 101 is provided at the lower part of the outer cover 10.

[0025] Specifically, see Figure 5 The angle between the central axis of the flow-around inclined hole 161 and the top wall of the combustion tube 16 is 25°-45°, and the projection of the central axis of the flow-around inclined hole 161 on the top wall of the combustion tube 16 is along the circumferential tangent direction.

[0026] Specifically, see Figure 4 The first-layer uniformly distributed plate 141 is provided with a row of first-layer uniformly distributed holes in an annular shape, and the second-layer uniformly distributed plate 142 is provided with a row of second-layer uniformly distributed holes in an annular shape. The number of the first-layer uniformly distributed holes is less than that of the second-layer uniformly distributed holes, and the spacing between the first-layer uniformly distributed holes is larger than that of the second-layer uniformly distributed holes.

[0027] Specifically, see Figure 2 The aperture of the cathode exhaust gas main inlet hole 17 is larger than that of the cathode exhaust gas supplementary inlet hole 19 and the cooling mixing inlet hole 20.

[0028] Specifically, two symmetrical notches 102 are provided on the upper portion of the outer cover 10 ( Figure 1 and Figure 3 Only one of the gaps 102 is shown. A partition bar 27 is welded at the gap 102 . The two partition bars 27 divide the upper inner portion of the outer cover 10 into a fuel air inlet chamber 12 and a water inlet chamber 13 . The igniter 6 is disposed through one of the partition bars 27 .

[0029] Specifically, see Figure 3 The upper part of the fuel inlet cavity 12 is provided with an arc-shaped air equalizing sheet 122, and the arc-shaped air equalizing sheet 122 is provided with air equalizing holes. The arc-shaped air equalizing sheet 122 divides the upper part of the fuel inlet cavity 12 into an air inlet equalizing cavity 123, and the fuel inlet port 121 is provided in the air inlet equalizing cavity 123.

[0030] Specifically, see Figure 3 The cross section of the heat exchange fin 11 is in the shape of a square wave signal, and the multiple inner walls of the heat exchange fin 11 are all in contact with the outer wall of the outer tube 8 , and the multiple outer walls of the heat exchange fin 11 are all in contact with the inner wall of the outer cover 10 .

[0031] Specifically, see Figure 3 The material of the heat exchange fin 11 is aluminum alloy, the thickness of the heat exchange fin 11 is 0.3mm-0.5mm, the circumferential pitch of the heat exchange fin 11 is 2.3mm-2.7mm, and the radial height of the heat exchange fin 11 is 7mm-9mm.

[0032] Specifically, see Figure 3 The upper part of the water inlet cavity 13 is provided with an arc-shaped liquid balancing sheet 132, and the arc-shaped liquid balancing sheet 132 is provided with a liquid balancing hole. The arc-shaped liquid balancing sheet 132 divides the upper part of the water inlet cavity 13 into a water inlet balancing cavity 133, and the water inlet 131 is provided in the water inlet balancing cavity 133.

[0033] Specifically, see Figure 3 The porous metal 18 is provided with a plurality of circumferential holes, a plurality of radial holes and a plurality of vertical holes, and the corresponding circumferential holes, radial holes and vertical holes are connected inside the porous metal 18 (see Figure 2 ).

[0034] The working principle of the present invention is as follows: See Figure 2 , the anode exhaust gas (mainly hydrogen, carbon monoxide, and methane) enters from the upper opening of the uniform distribution tube 14, passes through the uniform holes provided by the first uniform distribution plate 141 and the second uniform distribution plate 142, and then evenly enters the combustion tube 16. The cathode exhaust gas (mainly nitrogen and oxygen) enters from the upper opening of the outer tube 8, and the cathode exhaust gas enters the combustion tube 16 through the bypass inclined hole 161, the cathode exhaust gas main air inlet hole 17, the cathode exhaust gas supplementary air inlet hole 19, and the cooling and mixing air inlet hole 20. Because the igniter 6 is arranged between the cathode exhaust gas main air inlet hole 17 and the second uniform distribution plate 142, when the igniter 6 is ignited, the main combustion area (referred to as the combustion area) is the area between the cathode exhaust gas main air inlet hole 17 and the second uniform distribution plate 142.

[0035] The cathode exhaust gas entering through the cathode exhaust main air inlet 17 is used as a combustion aid for stable combustion of the combustion tube 16. The cathode exhaust gas enters through the bypass inclined hole 161 to generate a swirl, so that the cathode exhaust gas and the anode exhaust gas are quickly and fully mixed in the above-mentioned combustion area, so that the combustion is more complete. The cathode exhaust gas entering through the cathode exhaust supplementary air inlet 19 is used to further react with the anode exhaust gas that has not been burned, so that the reaction between the two is more complete and thorough, thereby reducing the exhaust gas emission at the outlet. The cathode exhaust gas entering through the cooling mixing air inlet 20 is mixed with the high-temperature gas after combustion to reduce the outlet temperature.

[0036] The chemical energy of the anode exhaust gas and the cathode exhaust gas can be more fully released by the mixed combustion. In order to recover the heat of the high-temperature anode exhaust gas and the high-temperature cathode exhaust gas and the combustion heat of the two, an outer cover 10 is arranged on the outer wall of the outer cylinder 8, and the upper part of the inner cavity of the outer cover 10 is divided into a fuel air inlet cavity 12 and a water inlet cavity 13 by two dividing strips 27.

[0037] The fuel gas (mainly methane) is input into the intake air equalization cavity 123 through the fuel intake port 121, and evenly enters the fuel intake cavity 12 through the equalization holes of the arc-shaped equalization plate 122, and then flows from top to bottom through the surfaces of each section of the heat exchange fin 11 and enters the lower part of the inner cavity of the outer cover 10. The fuel gas flows through the heat exchange fin 11 to absorb heat and increase its temperature.

[0038] Deionized water is input into the water inlet and water balancing chamber 133 through the water inlet 131, and flows to the porous metal 18 through the balancing holes of the arc-shaped balancing plate 132. The porous metal 18 is provided with a plurality of circumferential holes, a plurality of radial holes, and a plurality of vertical holes, and the corresponding circumferential holes, radial holes, and vertical holes are connected inside the porous metal 18, so the surface heat exchange area of ​​the porous metal 18 is extremely large. The deionized water flows through the porous metal 18 and absorbs heat and evaporates into water vapor.

[0039] The fuel gas (mainly methane) that absorbs heat and heats up and mixes with water vapor to form a swirl when flowing through the mixing vane 81 and is fully mixed. They react with each other to form hydrogen and carbon monoxide, which are transported to the reformer (not shown) through the mixed gas outlet 101 for reforming.

[0040] The technical effects of the present invention are as follows: 1. The anode exhaust gas (mainly hydrogen, carbon monoxide, and methane) and the cathode exhaust gas (mainly nitrogen and oxygen) are fully mixed in the above-mentioned combustion area and then ignited, so that the two are fully burned, thereby releasing the chemical energy of the anode exhaust gas and the cathode exhaust gas, so that the heat energy of the two can be more thoroughly recovered; 2. The anode exhaust gas (mainly hydrogen, carbon monoxide, and methane) and the cathode exhaust gas (mainly nitrogen and oxygen) are fully mixed in the above-mentioned combustion area and ignited before being discharged, which can reduce the emission concentration of the anode exhaust gas and the cathode exhaust gas, which is beneficial to environmental protection; 3. Heat exchange fins 11 and porous metal 18 are provided on both sides of the outer wall of the outer tube 8. The heat exchange fins 11 exchange heat with the fuel gas (mainly methane) flowing through. The porous metal 18 exchanges heat with the deionized water flowing through, causing the ionized water to evaporate into water vapor. The heated fuel gas and water vapor reach reaction conditions and react to form hydrogen and carbon monoxide. This process absorbs and utilizes the heat of the anode exhaust gas and the cathode exhaust gas themselves, as well as the heat generated by the combustion of the two, so that the temperature of the mixed gas discharged from the lower end of the combustion tube 16 is reduced. Furthermore, the cathode exhaust gas entering through the cooling mixing air inlet 20 is mixed with the high-temperature gas after combustion, which also plays a role in reducing the temperature of the mixed gas discharged from the lower end of the combustion tube 16. By reducing the temperature of the exhaust gas, the damage to the system components caused by thermal stress can be reduced; 4. In the prior art, the anode exhaust gas treatment system and cathode exhaust gas treatment system of the solid oxide fuel cell (SOFC) are two independent systems, and the fuel treatment system for producing the fuel required for the solid oxide fuel cell (SOFC) is also an independent system. The connection loss and heat loss within each of the three systems restrict the overall efficiency of the solid oxide fuel cell (SOFC). Moreover, the three systems exist independently and take up space.

[0041] The present invention integrates the anode exhaust gas treatment system, the cathode exhaust gas treatment system and the fuel treatment system, and utilizes the heat (gas waste heat and combustion heat) of the anode exhaust gas and the cathode exhaust gas to perform fuel treatment, so that the fuel gas (mainly methane) reacts with water vapor to generate hydrogen and carbon monoxide for subsequent reforming.

[0042] Integrating the anode exhaust gas treatment system, cathode exhaust gas treatment system and fuel treatment system together can greatly reduce the original connection loss and heat loss, thereby greatly improving the overall efficiency of the solid oxide fuel cell (SOFC). In addition, it greatly simplifies the system structure and greatly reduces the space it occupies.

[0043] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in the form of preferred embodiments, it is not intended to limit the present invention. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An integrated exhaust and fuel treatment assembly for a solid oxide fuel cell system, characterized in that: The invention comprises an outer tube and a combustion tube, wherein the combustion tube is arranged in the outer tube, a uniform distribution tube is penetrated in the middle of the top wall of the combustion tube, a first uniform distribution plate and a second uniform distribution plate are arranged on the inner wall of the uniform distribution tube, the first uniform distribution plate and the second uniform distribution plate are both provided with uniform distribution holes, a plurality of flow-around inclined holes are arranged on the top wall of the combustion tube, and the plurality of flow-around inclined holes are distributed around the uniform distribution tube, an annular baffle is arranged on the outer wall of the combustion tube, the outer edge of the annular baffle is connected to the inner wall of the outer tube, a cathode exhaust gas main air inlet hole, a cathode exhaust gas supplementary air inlet hole and a cooling mixing air inlet hole are arranged on the outer wall of the combustion tube, the cathode exhaust gas main air inlet hole, the cathode exhaust gas supplementary air inlet hole and the cooling mixing air inlet hole are arranged on the outer wall of the combustion tube, and the cathode exhaust gas supplementary air inlet hole and the cathode exhaust gas supplementary air inlet hole are arranged on the outer wall of the combustion tube. The distances between the gas replenishment air inlet hole and the cooling mixing air inlet hole and the uniform distribution cylinder increase successively. The height position of the annular baffle is lower than the cooling mixing air inlet hole. An igniter is arranged between the main air inlet hole of the cathode exhaust gas and the second-layer uniform distribution plate. An outer cover is arranged on the outer wall of the outer cylinder. The upper part of the inner cavity of the outer cover is divided into a fuel air inlet cavity and a water inlet cavity. The fuel air inlet cavity is provided with a fuel air inlet port, and the water inlet cavity is provided with a water inlet port. Heat exchange fins are arranged in the fuel air inlet cavity, and porous metal is arranged in the water inlet cavity. A mixing vane is arranged at the lower part of the outer wall of the outer cylinder, and a mixed gas outlet is arranged at the lower part of the outer cover.

2. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 1, characterized in that: The angle between the central axis of the flow-around inclined hole and the top wall of the combustion tube is 25°-45°, and the projection of the central axis of the flow-around inclined hole on the top wall of the combustion tube is along the circumferential tangent direction.

3. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 1, characterized in that: The first-layer uniformly distributed plate is provided with a row of first-layer uniformly distributed holes distributed in an annular shape, and the second-layer uniformly distributed plate is provided with a row of second-layer uniformly distributed holes distributed in an annular shape. The number of the first-layer uniformly distributed holes is less than that of the second-layer uniformly distributed holes, and the spacing between the first-layer uniformly distributed holes is larger than that of the second-layer uniformly distributed holes.

4. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 1, characterized in that: The aperture of the cathode exhaust gas main air inlet hole is larger than the cathode exhaust gas supplementary air inlet hole and the cooling mixing air inlet hole.

5. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 1, characterized in that: Two symmetrical notches are arranged on the upper part of the outer cover, and partition strips are welded at the notches. The two partition strips divide the upper part of the inner cavity of the outer cover into a fuel air inlet cavity and a water inlet cavity, and the igniter is arranged through one of the partition strips.

6. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 1, characterized in that: An arc-shaped air equalizing plate is arranged on the upper part of the fuel air inlet cavity, and an air equalizing hole is arranged on the arc-shaped air equalizing plate. The arc-shaped air equalizing plate divides the upper part of the fuel air inlet cavity into an air inlet equalizing cavity, and the fuel air inlet port is arranged in the air inlet equalizing cavity.

7. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 1, characterized in that: The cross section of the heat exchange fin is in the shape of a square wave signal, and multiple inner walls of the heat exchange fin are all in contact with the outer wall of the outer tube, and multiple outer walls of the heat exchange fin are all in contact with the inner wall of the outer cover.

8. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 7, characterized in that: The material of the heat exchange fin is aluminum alloy, the thickness of the heat exchange fin is 0.3mm-0.5mm, the circumferential pitch of the heat exchange fin is 2.3mm-2.7mm, and the radial height of the heat exchange fin is 7mm-9mm.

9. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 1, characterized in that: The upper part of the water inlet cavity is provided with an arc-shaped liquid balancing sheet, which is provided with a liquid balancing hole. The arc-shaped liquid balancing sheet divides the upper part of the water inlet cavity into a water inlet balancing cavity, and the water inlet is arranged in the water inlet balancing cavity.

10. The exhaust gas and fuel integrated processing assembly of the solid oxide fuel cell system according to claim 1, characterized in that: The porous metal is provided with a plurality of circumferential holes, a plurality of radial holes and a plurality of vertical holes, and the corresponding circumferential holes, radial holes and vertical holes are connected inside the porous metal.

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