Tail gas burner, tail gas treatment system and treatment method

Abstract

The present invention discloses a tail gas burner, a tail gas treatment system and a treatment method, wherein the tail gas processor comprises an upper plate and a lower plate constituting a sealed inner cavity, a cathode tail gas inlet is left at one end of the inner cavity, cooling gas exhaust holes are linearly arranged on both sides of the upper plate along the flow direction of the cathode tail gas, a plurality of cathode tail gas exhaust holes are arranged in the middle of the upper plate, and the opening size of the cathode exhaust holes decreases with the flow direction of the cathode tail gas; the middle of the upper plate also has an anode tail gas exhaust hole running through the upper plate and the lower plate, a combustion chamber is installed above the upper plate to form a combustion chamber for providing combustion space for the cathode tail gas and the anode tail gas, a high-temperature exhaust gas outlet is provided above the combustion chamber, and an ignition device is provided inside the combustion chamber; and a bypass air inlet is provided on the lower plate. The structural design in the present invention can improve the safety and reliability of the tail gas burner, reduce its manufacturing cost, improve combustion uniformity, and be able to adapt to a wider excess air coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, and more particularly to a tail gas burner, a tail gas treatment system and a treatment method. Background Art

[0002] Solid Oxide Fuel Cell (SOFC) is a third-generation fuel cell. It is an all-solid-state chemical power generation device that directly converts the chemical energy stored in fuel and oxidant into electrical energy in an efficient and environmentally friendly manner at medium and high temperatures. It is the most widely used type of fuel cell and has the highest theoretical energy density.

[0003] Currently, SOFC mainly uses hydrogen as fuel. Considering that it is impossible to completely react the input anode gas 100% inside the SOFC stack, an exhaust gas burner for further burning the exhaust gas after the stack reaction is necessary.

[0004] At present, there are three main forms of SOFC tail gas combustion involved in the existing technology: catalytic combustion, premixed combustion, and diffusion combustion. Although the catalytic combustion burner can improve the combustion efficiency, the manufacturing cost is greatly increased due to the need for expensive catalysts, and this combustion method will cause a large pressure loss, which in turn affects the overall efficiency; although the premixed combustion burner can make the tail gas and air more fully and evenly mixed, its allowable excess air coefficient and temperature range are generally small, and the tail gas burner currently using the premixed combustion scheme has a more complex structural design in order to improve the above defects, which has an adverse effect on reliability and life; the composition of the diffusion combustion burner is usually simpler, and there are no high-cost materials such as catalysts or porous media, but because the guarantee of combustion reliability and safety depends almost entirely on design, the structural design is very difficult, and usually due to poor design, there are unstable combustion conditions such as flashback and flameout, and the combustion chamber will have a significant temperature gradient due to uneven combustion distribution, resulting in large thermal stress.

[0005] Therefore, with the continuous development of related industries, how to provide a new tail gas burner, tail gas treatment system and treatment method to meet the increasingly higher requirements of SOFC systems is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of this, in order to overcome the defects of the exhaust gas burner in the prior art, the present invention provides a new exhaust gas burner with a simple structure, and an exhaust gas treatment system and a treatment method including the exhaust gas burner, aiming to improve safety and reliability, reduce manufacturing costs, enhance combustion uniformity and be able to adapt to a wider excess air coefficient.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] In one aspect, the present application discloses a tail gas burner, comprising an upper plate and a lower plate forming a sealed inner cavity, wherein one end of the sealed inner cavity has a cathode tail gas inlet,

[0009] Cooling gas exhaust holes are linearly arranged on both sides of the upper electrode plate along the flow direction of the cathode tail gas.

[0010] The middle part of the upper electrode plate is provided with a plurality of cathode tail gas exhaust holes, and the opening size of the cathode exhaust holes decreases with the flow direction of the cathode tail gas; the middle part of the upper electrode plate also has an anode tail gas exhaust hole that penetrates the upper electrode plate and the lower electrode plate,

[0011] A combustion cavity is installed above the upper electrode plate to form a combustion chamber for providing combustion space for the cathode tail gas and the anode tail gas. A high-temperature exhaust gas outlet is provided above the combustion chamber, and an ignition device is inside the combustion chamber.

[0012] The lower pole plate is provided with a bypass air inlet hole.

[0013] Preferably, the plane where the cathode tail gas exhaust holes are located is higher than the plane where the anode tail gas exhaust holes are located.

[0014] Preferably, there are a convex structure 1 and a convex structure 2 below the lower electrode plate, the convex structure 1 covers the bypass air inlet hole to form a closed space 1, and the closed space 1 has a bypass air inlet;

[0015] The second protruding structure covers the anode tail gas exhaust hole to form a second enclosed space, and the second enclosed space has an anode tail gas inlet.

[0016] Preferably, the protruding structure 1 and the protruding structure 2 form an integrated bottom buckle plate structure;

[0017] Preferably, the upper electrode plate is formed with a groove downward, and the groove forms two channels on both sides of the upper electrode plate, the direction of the channel is parallel to the direction of the cathode tail gas flow, and the cooling gas exhaust hole is arranged on the channel, and a cathode tail gas diffusion channel connected to the channel is arranged in parallel in a direction perpendicular to the channel, and the cathode tail gas exhaust hole is arranged on the cathode tail gas diffusion channel; the groove also has an anode tail gas exhaust hole that runs through the upper electrode plate and the lower electrode plate;

[0018] Preferably, the cross-sectional dimensions of the parallel arranged cathode tail gas diffusion channels decrease along the flow direction of the cathode tail gas in the channels;

[0019] The opening size of the cathode tail gas exhaust hole decreases symmetrically along the flow direction of the cathode tail gas in the cathode tail gas diffusion channel;

[0020] Preferably, a partition is provided on the outside of the combustion chamber, and the partition and the combustion chamber form a narrow passage including the cooling gas exhaust hole.

[0021] On the other hand, the present application also discloses a tail gas treatment system, including a SOFC stack, a heat exchanger and a tail gas burner as described above,

[0022] The SOFC stack is used to input the generated cathode tail gas and anode tail gas into the tail gas burner through the cathode tail gas inlet and the anode tail gas exhaust hole respectively.

[0023] The tail gas burner is used to burn the cathode tail gas and the anode tail gas to generate high-temperature exhaust gas, and transport the high-temperature exhaust gas to the heat exchanger.

[0024] The heat exchanger heats the external air through the high-temperature exhaust gas, and transmits the heated external air to the SOFC stack to provide a reaction temperature for the SOFC stack.

[0025] Preferably, the system further comprises an air separation device, which is used to provide bypass air to the tail gas burner through the bypass air inlet hole, and to provide the external air to the heat exchanger.

[0026] In another aspect, the present invention further discloses a tail gas treatment method, mainly based on the tail gas treatment system as described above, the method comprising:

[0027] The cathode tail gas and the anode tail gas generated by the SOFC stack are respectively input into the tail gas burner for combustion to generate high-temperature exhaust gas.

[0028] The heat exchanger heats the external air according to the high-temperature exhaust gas to obtain heated external air; and transmits the heated external air to the SOFC stack to provide a suitable reaction temperature for the SOFC stack;

[0029] The SOFC stack reacts at the suitable reaction temperature.

[0030] It can be known from the above technical scheme that the present invention discloses a tail gas burner. Compared with the prior art, the beneficial effect of the present application is that by mixing and burning the cathode tail gas and the anode tail gas through the tail gas burner provided by the present application, the mixing effect of the cathode tail gas and the anode tail gas can be significantly improved, and the combustion efficiency is improved. At the same time, the tail gas burner in the present application has a simple structure, and the basic functions of the tail gas burner can be realized by only three parts, and through the intake of bypass air, the burner can adapt to a wider excess air coefficient, thereby meeting the requirements of wide-range combustion. In addition, the cathode tail gas exhaust holes and the anode tail gas exhaust holes set by the present invention can improve the uniformity of combustion and reduce the uneven thermal stress of the combustion chamber.

[0031] Another beneficial effect of the present application is that it fully exploits limited resources and innovatively proposes to use a mixture of cathode exhaust gas with a lower temperature before combustion and external air to cool the high-temperature combustion chamber, which has a beneficial effect on increasing the service life and reliability of the burner.

[0032] Another beneficial effect of the present application is that it fully considers the low-cost design concept, not only does it not need to use a catalyst, etc., but it can also simplify the structural composition of the tail gas burner, thereby providing a beneficial basis for further mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 The accompanying drawing is a structural diagram of the tail gas burner provided by the present invention;

[0035] Figure 2 The accompanying drawing is a side structural diagram of the tail gas burner provided by the present invention;

[0036] Figure 3 The accompanying drawing is a top view of the structure of the tail gas burner provided by the present invention;

[0037] Figure 4 The accompanying drawing is a structural diagram of the tail gas treatment system provided by the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] On the one hand, the present invention first discloses a tail gas burner, the structure of which includes an upper plate and a lower plate forming a sealed inner cavity, one end of the sealed inner cavity is provided with a cathode tail gas inlet,

[0040] On both sides of the upper electrode plate, along the flow direction of the cathode tail gas, cooling gas exhaust holes 17 of uniform size are linearly arranged, and a plurality of cathode tail gas exhaust holes 18 are provided in the middle, and the opening size of the cathode exhaust holes decreases with the flow direction of the cathode tail gas; at the same time, there is also an anode tail gas exhaust hole 19 in the middle of the upper electrode plate that runs through the upper electrode plate and the lower electrode plate.

[0041] In addition, a combustion cavity 24 is installed above the upper electrode plate to form a combustion chamber 23 for providing combustion space for cathode tail gas and anode tail gas, wherein a high-heat exhaust gas outlet 25 is provided above the combustion chamber, and an ignition device 22 is inside;

[0042] There is a bypass air inlet hole on the lower plate.

[0043] Compared with the existing tail gas burner, the present application reduces the complexity of the structure. It is composed of only three parts, which can achieve the basic functions and beneficial effects of the tail gas burner. Moreover, these three parts can be manufactured by a rapid prototyping method similar to stamping, and the form of mutual fixed connection is simple and reliable, which lays a foundation for the mass production of tail gas burner components.

[0044] In one embodiment, if Figure 1-2 As shown, the upper electrode plate 11 and the lower electrode plate 12 form a sealed inner cavity, and an opening 14 is left at the front end of the sealed inner cavity. The opening 14 serves as a cathode tail gas inlet to receive the cathode tail gas.

[0045] On the upper electrode plate 11, on both sides parallel to the cathode exhaust gas flow direction, a plurality of cooling gas exhaust holes 17 of uniform size are arranged in a straight line to discharge the cathode gas as cooling gas; and in the middle of the upper electrode plate 11, a plurality of cathode exhaust holes 18 are arranged in a matrix, and a plurality of anode exhaust holes 19 are arranged passing through the upper electrode plate 11 and the lower electrode plate 12. In one embodiment, in order to facilitate the full mixing of the cathode exhaust gas and the anode exhaust gas in the middle of the upper electrode plate, the cathode exhaust holes and the anode exhaust holes are arranged crosswise.

[0046] In another embodiment, the middle part of the upper electrode plate is arranged downward to form a groove, and the groove forms two channels on both sides of the upper electrode plate. The direction of the channel is parallel to the direction of the cathode exhaust gas flow, and there are cooling gas exhaust holes 17 on the channels. Furthermore, a cathode exhaust gas diffusion channel 16 connecting the two channels is arranged in parallel in a direction perpendicular to the channel, and a cathode exhaust gas exhaust hole 18 is provided on the side of the cathode exhaust gas diffusion channel facing the combustion chamber; there is also an anode exhaust gas exhaust hole 19 in the groove that runs through the upper electrode plate and the lower electrode plate.

[0047] The cathode tail gas exhaust hole 18 and the anode tail gas exhaust hole 19 together constitute the combustion matrix of the tail gas burner. The design of the relative position and size of the combustion matrix has an important influence on the combustion efficiency and the guarantee of wide-range combustion.

[0048] Specifically, if the cathode tail gas exhaust hole 18 and the anode tail gas exhaust hole 19 enter the combustion chamber through the same plane, deignition may occur at a high flow rate, resulting in incomplete combustion or even no combustion. Therefore, the exhaust hole of one gas needs to be placed below the exhaust hole of the other gas. In one embodiment, a better choice is to place the plane where the anode tail gas exhaust hole 19 is located below the plane where the cathode gas exhaust hole 18 is located, such as Figure 1 shown.

[0049] This design allows the anode tail gas to be discharged from the anode tail gas exhaust port, diffuse initially in the combustion chamber, meet the cathode tail gas, and be appropriately wrapped by the cathode tail gas to cause combustion. This design not only makes the combustion more complete, but also allows it to adapt to a larger excess air coefficient and meet wide-range combustion.

[0050] Since the flow direction of the anode tail gas is always parallel to the anode tail gas exhaust hole 19 before entering the combustion chamber, it can ensure that the gas flow rate discharged from the anode tail gas exhaust hole 19 is roughly equal. However, as the cathode tail gas decreases along the flow velocity and the pressure accumulates, the gas flow rate through each cathode tail gas exhaust hole 18 will be different; especially for Figure 1 The structure shown in Figure 1 In the process, the cathode exhaust gas needs to pass through the cathode exhaust gas inlet 14 and then pass through the cathode exhaust gas branch 15 to enter the cathode exhaust gas diffusion channel 16 perpendicular to it, and finally pass through the cathode exhaust gas exhaust hole 18 perpendicular to the cathode exhaust gas diffusion channel 16 to enter the combustion chamber, and its flow path is more complicated.

[0051] Therefore, in order to ensure that the gas flow rate discharged from all cathode tail gas exhaust holes 18 into the combustion chamber is roughly equal, in this application, the opening size of the cathode tail gas exhaust holes 18 is designed to decrease along the flow direction of the cathode tail gas. Figure 1The structure in the cathode tail gas diffusion channel 16 is arranged in parallel so that the cross-sectional dimensions of the channels decrease along the flow direction of the cathode tail gas in the channels; thereby appropriately compensating for the pressure accumulation effect generated along the gas flow direction in the cathode tail gas branch;

[0052] The opening size of the cathode tail gas exhaust hole 18 is symmetrically decreased along the flow direction of the cathode tail gas in the cathode tail gas diffusion channel 16, so as to appropriately compensate for the pressure accumulation effect generated along the gas flow direction in the cathode tail gas diffusion channel.

[0053] In this application, the degree to which the above dimensions need to be reduced, including the size of the diffusion channel and the closing speed, is determined through theoretical calculations, and optimization and refinement are completed by simulation means. The specific calculation process is as follows:

[0054] According to the principle of conservation of momentum in pipe flow, the correction coefficient K is introduced, and the Bernoulli equation is listed for a certain diffusion channel 16 and its front and rear cathode tail gas branches 15:

[0055]

[0056] Among them, p1 and p2, u1 and u2 are the pressure and flow rate in the cathode tail gas branch 15 before and after the diffusion channel 16, respectively. At the same time, the gas flow rate flowing into the diffusion channel 16 can be calculated:

[0057]

[0058] Wherein, C is the flow coefficient. The correction coefficient K and the flow coefficient C can be found in the data. By using the above formulas in sequence, the flow of each diffusion channel 16 can be roughly calculated.

[0059] Experiments have shown that the present invention can make the gas flow rates of all cathode tail gas exhaust holes approximately equal, and can bring beneficial effects on uniform and stable combustion in the combustion chamber.

[0060] In another embodiment, in order to control the temperature and flow rate of the cathode exhaust gas involved in the combustion in real time, more air needs to be introduced, that is, the entire exhaust gas burner needs to have a wider excess air coefficient for better operation, so a bypass air inlet is provided on the lower electrode plate, wherein there are multiple bypass air inlets, so that the exhaust gas burner can adapt to a wider excess air coefficient; further, there are protrusion structures 1 and 2 below the lower electrode plate, such as Figure 2 As shown, the protruding structure 1 covers the bypass air inlet to form a closed space 1, and the closed space 1 has a bypass air inlet 20;

[0061] The second protruding structure covers the anode tail gas exhaust hole to form a second enclosed space, and the second enclosed space has an anode tail gas inlet 21 .

[0062] In one embodiment, the protruding structure 1 and the protruding structure 2 form an integrated bottom buckle plate structure.

[0063] like Figure 3 As shown, the bottom buckle plate 13 is attached and fixed to the lower electrode plate 12, and the two closed spaces formed by the bottom buckle plate 13 and the lower electrode plate 12 are used to receive bypass air and anode tail gas respectively, so that the bypass air and anode tail gas can enter the combustion chamber evenly, and the gas flow rate can be controlled at the same time. For example, before the bypass air enters the combustion chamber, its flow rate is controlled in real time by the gas separation device to adjust the excess air coefficient of the exhaust gas burner combustion reaction, and at the same time, the combustion chamber is cooled down along with the cathode tail gas.

[0064] For the exhaust gas burner, since its combustion chamber is in a high-temperature working state most of the time, in order to appropriately increase its reliability and service life, the present application sets a cooling gas exhaust hole 17 on the cathode exhaust gas branch of the upper electrode plate along its flow direction, which is used to discharge the mixed gas of the cathode exhaust gas with a lower temperature before combustion and the external air into the interior along the edges of both sides of the combustion chamber, thereby forming a relatively low-temperature air barrier between the core area of ​​the combustion reaction and the wall of the combustion chamber, thereby effectively reducing the shell temperature of the combustion chamber.

[0065] In one embodiment, a partition is provided on the outside of the combustion chamber 24, which is parallel to the wall of the combustion chamber and forms a narrow channel including a cooling gas exhaust hole with the combustion chamber 24, so that the cooling gas can pass through the narrow channel and mix with the high-heat exhaust gas at a position above the combustion chamber near the high-heat exhaust gas outlet, thereby making the cooling effect on the wall of the combustion chamber more obvious.

[0066] The exhaust gas burner disclosed in the present invention is applied to solid oxide fuel cells, which can not only adapt to a wider excess air coefficient and significantly improve the combustion efficiency and the temperature uniformity of the combustion chamber, but also can appropriately cool the combustion chamber that is always in a high temperature state to improve its service life and reliability; in addition, the low-cost design concept is implemented throughout, providing a design that does not use high-cost consumables such as catalysts and porous materials, and has a simple and reliable manufacturing method.

[0067] on the other hand,

[0068] The present invention also discloses a tail gas treatment system, which includes a tail gas burner, a SOFC stack and a heat exchanger as described above.

[0069] The SOFC stack is used to input the generated cathode tail gas and anode tail gas into the tail gas burner through the cathode tail gas inlet and the anode tail gas exhaust hole respectively.

[0070] The tail gas burner is used to burn the cathode tail gas and the anode tail gas to generate high-temperature exhaust gas, and then transport the high-temperature exhaust gas to the heat exchanger.

[0071] The heat exchanger heats the external air through the high-temperature exhaust gas and transmits the heated external air to the SOFC stack to provide the reaction temperature for the SOFC stack.

[0072] In one embodiment, the system further includes an air distributor, which is used to provide bypass air to the tail gas burner through the bypass air inlet hole and to provide external air to the heat exchanger. Figure 4 As shown, A is the SOFC stack, B is the gas distribution device, C is the tail gas burner, and D is the heat exchanger.

[0073] Among them, 6 is the anode gas inlet channel of the fuel cell stack. The cathode gas of the fuel cell stack passes through the channel 1, the gas separator B and the heat exchanger D, and then enters the fuel cell stack through the cathode gas inlet channel 4. The anode gas and the cathode gas react in the fuel cell stack A to produce cathode tail gas and anode tail gas. Further, the cathode tail gas and the anode tail gas pass through the cathode tail gas inlet channel 5 and the anode tail gas inlet channel 7 respectively, enter the cathode tail gas inlet and the anode tail gas inlet of the tail gas burner C, and then enter the combustion chamber, ignite and burn; the high-temperature exhaust gas generated by the combustion enters the heat exchanger D through the high-temperature exhaust gas channel 8, thereby performing heat exchange, that is, heating the external air entering the heat exchanger D through the gas separator B and the external cold air inlet channel 3, and the heated air enters the fuel cell through the cathode gas inlet channel 4, thereby providing a suitable temperature for the fuel cell reaction.

[0074] At the same time, the gas distribution device B also provides bypass air for the exhaust gas burner through the bypass air inlet channel 2, so that according to the temperature monitoring device arranged on the exhaust gas burner, it can control it to always be in the appropriate operating temperature range with low delay; in addition, it can cool the metal shell of the exhaust gas burner and adjust the excess air coefficient of the combustion in real time.

[0075] In another aspect, the present invention further discloses a tail gas treatment method, which mainly uses the tail gas treatment system as described above, and the method specifically comprises:

[0076] The cathode tail gas and anode tail gas of the SOFC stack are respectively input into the tail gas burner for combustion to generate high-temperature exhaust gas.

[0077] The heat exchanger heats the outside air according to the high-temperature exhaust gas, and after obtaining the heated outside air, transmits it to the SOFC stack to provide a suitable reaction temperature for the SOFC stack;

[0078] The SOFC stack reacts at the appropriate reaction temperature.

[0079] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0080] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tail gas burner, characterized in that: It includes an upper plate and a lower plate forming a sealed inner cavity, one end of the sealed inner cavity is provided with a cathode tail gas inlet, On both sides of the upper electrode plate, cooling gas exhaust holes are linearly arranged along the flow direction of the cathode tail gas. A plurality of cathode tail gas exhaust holes are provided in the middle of the upper electrode plate, and an anode tail gas exhaust hole is also provided in the middle of the upper electrode plate, which penetrates the upper electrode plate and the lower electrode plate, and the plane where the cathode tail gas exhaust hole is located is higher than the plane where the anode tail gas exhaust hole is located; The upper electrode plate is formed with a groove downward, and the groove forms two channels on both sides of the upper electrode plate, the direction of the channel is parallel to the direction of the cathode tail gas flow, and the cooling gas exhaust hole is arranged on the channel, and a cathode tail gas diffusion channel connected to the channel is arranged in parallel in a direction perpendicular to the channel, and the cathode tail gas exhaust hole is arranged on the cathode tail gas diffusion channel; the groove also has an anode tail gas exhaust hole that runs through the upper electrode plate and the lower electrode plate; The cross-sectional dimensions of the parallel cathode tail gas diffusion channels decrease along the flow direction of the cathode tail gas in the channels; The opening size of the cathode tail gas exhaust hole decreases symmetrically along the flow direction of the cathode tail gas in the cathode tail gas diffusion channel; A combustion cavity is installed above the upper electrode plate to form a combustion chamber for providing combustion space for the cathode tail gas and the anode tail gas. A high-temperature exhaust gas outlet is provided above the combustion chamber, and an ignition device is inside the combustion chamber. The lower pole plate is provided with a bypass air inlet hole.

2. The tail gas burner according to claim 1, characterized in that: There are a convex structure 1 and a convex structure 2 below the lower electrode plate, the convex structure 1 covers the bypass air inlet hole to form a closed space 1, and the closed space 1 has a bypass air inlet; The second protruding structure covers the anode tail gas exhaust hole to form a second enclosed space, and the second enclosed space has an anode tail gas inlet.

3. The tail gas burner according to claim 2, characterized in that: The protruding structure 1 and the protruding structure 2 form an integrated bottom buckle plate structure.

4. The tail gas burner according to claim 1, characterized in that: A partition is provided outside the combustion chamber, and the partition and the combustion chamber form a narrow passage including the cooling gas exhaust hole.

5. A tail gas treatment system, characterized in that: It comprises a SOFC stack, a heat exchanger and a tail gas burner according to any one of claims 1 to 4, The SOFC stack is used to input the generated cathode tail gas through the cathode tail gas inlet and the anode tail gas through the anode tail gas exhaust hole into the tail gas burner, The tail gas burner is used to burn the cathode tail gas and the anode tail gas to generate high-temperature exhaust gas, and transport the high-temperature exhaust gas to the heat exchanger. The heat exchanger heats the external air through the high-temperature exhaust gas, and transmits the heated external air to the SOFC stack to provide a reaction temperature for the SOFC stack.

6. The exhaust gas treatment system according to claim 5, characterized in that: The system further comprises an air distributor, which is used to provide bypass air to the tail gas burner through the bypass air inlet hole and to provide the external air to the heat exchanger.

7. A tail gas treatment method, characterized in that: Based on the exhaust gas treatment system according to claim 5, the method comprises: The cathode tail gas and the anode tail gas generated by the SOFC stack are respectively input into the tail gas burner for combustion to generate high-temperature exhaust gas. The heat exchanger heats the external air by using the high-temperature exhaust gas to obtain heated external air; and transmits the heated external air to the SOFC stack to provide a suitable reaction temperature for the SOFC stack; The SOFC stack reacts at the suitable reaction temperature.

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