Catalytic burner device for solid oxide fuel cell (SOFC)

Abstract

The invention relates to a catalytic burner device for an SOFC (Solid Oxide Fuel Cell), which comprises an electric pile body, a gas inlet, a gas outlet, a gas inlet, a gas outlet and a gas outlet, one end of the combustor body is provided with a mixed gas inlet, and the mixed gas inlet faces the reaction gas outlet of the electric pile body; the gasket assembly is connected with the reaction gas outlet and the mixed gas inlet in a sealing manner, and a cavity for accommodating a mixing device is formed in the gasket assembly; and the locking mechanism is connected with the electric pile body and the burner body. By arranging the gasket assembly and the locking mechanism between the galvanic pile and the combustor, the thickness of the gasket assembly and the locking position of the locking mechanism can be adjusted to change the distance between the galvanic pile and the combustor, so that mixing devices with different specifications and sizes can be conveniently replaced and arranged in the gasket assembly, and the performance detection and optimization efficiency is improved; and the repeated processing cost of the test tool is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel cells, in particular to a catalytic combustor device for SOFC. BACKGROUND

[0002] During the operation of the combustor, the degree of mixing of fuel gas and air directly determines the combustion performance of the combustor. In an ideal state, uniform mixed gas can ensure that the combustion process proceeds stably and efficiently, thereby achieving the best combustion effect. However, in actual application, due to the limitations of mixing technology, the problem of uneven mixing of fuel gas and air is widespread. Unevenly mixed gas can cause local combustion in the combustor, leading to uneven heating of combustor components. Long-term operation will not only seriously damage the combustor components, but also may even cause the combustor to burn out, greatly affecting its service life and working stability, which is extremely detrimental to the normal and efficient operation of the catalytic combustor, especially the catalytic combustor for SOFC. Currently, in the process of studying the mixing device of the catalytic combustor for SOFC, due to the fixed and unadjustable distance between the stack and the catalytic combustor, it is difficult to adapt and install different specifications and sizes of mixing devices, and it is impossible to flexibly adjust the layout space according to actual needs. Due to the lack of adjustable mounting structure, researchers are difficult to quickly replace and arrange mixing devices of different designs, and it is impossible to efficiently carry out performance detection and optimization work, which further leads to frequent repeated processing of test tools, causing a large amount of time and resource waste, and limiting the research and development of the mixing device of the catalytic combustor for SOFC. SUMMARY

[0003] The embodiment of the present application provides a catalytic combustor device for SOFC to solve the problem in the prior art that due to the lack of adjustable mounting structure between the stack and the catalytic combustor, researchers are difficult to quickly replace and arrange mixing devices of different designs, and it is impossible to efficiently carry out performance detection and optimization work, which further leads to frequent repeated processing of test tools, causing a large amount of time and resource waste.

[0004] In a first aspect, a catalytic combustor device for SOFC is provided, comprising: a stack body, one end of which is provided with a reaction gas inlet, and one end of which is provided with a reaction gas outlet; a combustor body, one end of which is provided with a mixed gas inlet, and the mixed gas inlet faces the reaction gas outlet of the stack body; a gasket assembly, which is sealingly connected to the reaction gas outlet and the mixed gas inlet, and which is provided with a cavity in which a mixing device is accommodated; a locking mechanism, which is connected to the stack body and the combustor body.

[0005] In some embodiments, the opposite side walls of the burner body are fixedly installed with a mounting rack, and an elastic member is arranged between the mounting rack and the gasket assembly.

[0006] In some embodiments, the gasket assembly comprises a plurality of gaskets arranged in layers, including: a first gasket sealingly connected to the burner body and having a projection area greater than the burner body; a plurality of second gaskets sealingly connected between the first gasket and the stack body.

[0007] In some embodiments, the mounting rack is provided with a limiting groove matching the position and size of the elastic member.

[0008] In some embodiments, the first gasket is provided with a first positioning groove on the side close to the second gasket, and the second gasket is embedded in the first positioning groove.

[0009] In some embodiments, the first gasket is provided with a second positioning groove on the side close to the burner body, and the burner body is embedded in the second positioning groove.

[0010] In some embodiments, the first gasket is provided with a third positioning groove on the side close to the burner body, and the third positioning groove matches the position and size of the elastic member.

[0011] In some embodiments, the second positioning groove is provided with a sealing glue.

[0012] In some embodiments, the locking mechanism comprises: a first fixed rack fixedly installed on the opposite side walls of the stack body; a second fixed rack fixedly installed on the opposite side walls of the burner body; an adjusting screw rod, the axis direction of which is perpendicular to the axis of the stack body and passes through the first fixed rack or the second fixed rack; a locking nut threadedly connected to the end of the adjusting screw rod.

[0013] In some embodiments, the burner body is provided with a current collecting cover at the end away from the stack body.

[0014] The embodiments of the present application provide a catalytic burner device for SOFC. The stack body and the burner body are not rigidly connected by welding, but are combined and sealed by a gasket assembly, and the stack body and the burner body are connected by a locking mechanism. In use, the thickness of the gasket assembly and the locking position of the locking mechanism can be adjusted to change the distance between the stack and the burner, facilitate the replacement and arrangement of mixed devices of different specifications in the gasket assembly, improve the efficiency of performance detection and optimization, and reduce the repeated processing cost of test tooling. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0016] Figure 1 The SOFC catalytic combustor device structure schematic diagram provided by the embodiments of the present application; Figure 2 The SOFC catalytic combustor device cross-section structure schematic diagram provided by the embodiments of the present application; Figure 3 The Figure 2 The enlarged structure schematic diagram of A in the figure; Figure 4 The SOFC catalytic combustor device provided by the embodiments of the present application is a partial structure schematic diagram of the gasket assembly and the stack body.

[0017] In the figure: 1, stack body; 101, reaction gas inlet; 102, reaction gas outlet; 2, combustor body; 201, mixed gas inlet; 202, current collecting cover; 3, gasket assembly; 301, cavity; 302, first gasket; 303, second gasket; 304, first positioning groove; 305, second positioning groove; 306, third positioning groove; 307, thermocouple hole; 4, locking mechanism; 401, first fixing frame; 402, second fixing frame; 403, adjusting screw; 404, locking nut; 5, mounting frame; 501, limiting groove; 6, elastic member. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.

[0019] The SOFC catalytic combustor device provided by the embodiments of the present application can solve the problem in the related art that due to the lack of adjustable mounting structure between the stack and the catalytic combustor, researchers have difficulty in quickly replacing and arranging mixed devices of different designs, and cannot efficiently carry out performance detection and optimization work, thereby leading to frequent repeated processing of test tooling and causing a large amount of time and resource waste.

[0020] As Figures 1 to 4As shown, a catalytic burner device for SOFC includes: The stack body 1 is provided with a reaction gas inlet 101 at one end and a reaction gas outlet 102 at the other end. The burner body 2 is provided with a mixed gas inlet 201 at one end, and the mixed gas inlet 201 faces the reaction gas outlet 102 of the stack body 1. The gasket assembly 3 is sealingly connected to the reaction gas outlet 102 and the mixed gas inlet 201, and the gasket assembly 3 is provided with a cavity 301 accommodating a mixing device. The locking mechanism 4 is connected to the stack body 1 and the burner body 2.

[0021] In this application, the stack body 1 adopts an axial gas inlet and radial gas outlet structure: the reaction gas inlet 101 provided at one end of the stack includes a separate fuel inlet and air inlet, which are connected to the anode flow channel and the cathode flow channel respectively, forming a double-path gas inlet system; the reaction gas outlet 102 provided on the side is of an annular open structure and is directly connected to the anode tail gas channel and the cathode tail gas channel of each single cell in the stack. After the fuel gas (such as H2 and CO) and the oxidizing gas (air) enter the corresponding electrode flow channels, an electrochemical reaction occurs on both sides of the electrolyte to generate electric energy, and the unreacted anode tail gas and cathode tail gas are radially collected into the reaction gas outlet 102 under the action of pressure difference, forming mixed exhaust gas rich in combustible components and directly discharged, providing reactants for subsequent catalytic combustion. The open structure of the reaction gas outlet 102 realizes uniform exhaust of the tail gas, creating favorable conditions for efficient operation of the catalytic burner.

[0022] The SOFC catalytic burner device provided in the embodiment of the application uses a gasket assembly 3 for combined sealing and connects the stack body 1 and the burner body 2 through the locking mechanism 4, and in the use process, the thickness of the gasket assembly 3 and the locking position of the locking mechanism 4 can be adjusted to change the distance between the stack and the burner, facilitating replacement and arrangement of mixed devices of different specifications in the gasket assembly 3, improving the efficiency of performance detection and optimization, and reducing the repeated processing cost of test tools.

[0023] Further, the opposite side walls of the burner body 2 are fixedly provided with mounting racks 5, and elastic members 6 are arranged between the mounting racks 5 and the gasket assembly 3.

[0024] In this embodiment, the elastic member 6 is a compression spring.

[0025] In some optional embodiments, the elastic member 6 is a butterfly spring.

[0026] When the gasket assembly 3 is cooled, thermal expansion and contraction will occur, which will reduce the pressure stress between the gaskets and affect the sealing effect. When the locking mechanism 4 is used to lock the stack body 1 and the burner body 2, the burner body 2 will first press the elastic member 6, and then the burner body 2 will contact the gasket assembly 3 after the elastic member 6 is compressed to a certain extent. When the combustion is over and the cooling stage begins, the volume of the gasket assembly 3 will shrink, the compression force on the elastic member 6 will decrease, and the elastic member 6 will spring back due to its elasticity, thereby exerting a continuous and stable force on the gasket assembly 3, ensuring that the pressure stress between the gasket assemblies 3 will not change significantly, effectively avoiding problems such as poor sealing and gas leakage that may occur during the cooling process, and ensuring the sealing reliability and operating stability of the catalytic combustor under different working conditions.

[0027] The gasket assembly 3 includes a plurality of gaskets 302 and 303 stacked together. The first gasket 302 is in the form of a frame and has a cavity 301 for accommodating a mixing device. The first gasket 302 is made of ceramic material with excellent high-temperature stability and is sealingly connected to the burner body 2. It should be noted that the surface of the first gasket 302 has a certain roughness. Compared to a smooth ceramic surface, the lack of micro-gripping points can cause gaps during sealing. However, a moderate roughness can enhance the close fit between the first gasket 302 and the connecting components, thereby improving the sealing performance. In addition, the projection of the first gasket 302 on the burner body 2 is larger than the burner body 2, forming an annular sealing redundancy area. This area increases the contact area between the first gasket 302 and the catalytic combustor body 2 and the elastic member 6, so that the compression force is evenly distributed on the second gasket 303. The second gaskets 303 are also in the form of a frame and have a cavity 301 for accommodating a mixing device. The second gaskets 303 are made of mica material and have a certain elasticity. When compressed, they have a sealing effect and sealingly connect the first gasket 302 and the stack body 1. By changing the thickness and number of the second gaskets 303, the accommodating space of the mixing device can be effectively increased. For example, different thicknesses of silicon carbide foam ceramics can be arranged in the cavity 301 to achieve the mixing function of air and gas, and to meet the requirements of rapid arrangement and performance testing of different mixing devices.

[0028] The present application utilizes the high-temperature erosion resistance of ceramic material and the compressible and elastic properties of mica material to construct a gradient sealing structure between the stack body 1 and the burner body 2. Combined with the elastic member 6, a thermal-mechanical coupling sealing mechanism is formed to ensure the sealing reliability of the system during start-stop cycles.

[0029] Further, as shown in Figures 2 to 4 The first gasket 302 is provided with a first positioning groove 304 on the side close to the second gasket 303, and the second gasket 303 is embedded in the first positioning groove 304.

[0030] The first gasket 302 is provided with a ring-shaped first positioning groove 304 near the end face of the second gasket 303, which limits the installation position of the mica gasket to avoid misinstallation.

[0031] Further, as shown in the figure, Figures 2 to 4 the first gasket 302 is provided with a second positioning groove 305 near the side of the burner body 2, and the burner body 2 is embedded in the second positioning groove 305.

[0032] Further, the second positioning groove 305 is provided with sealing glue.

[0033] The first gasket 302 is provided with a ring-shaped second positioning groove 305 near the end face of the burner body 2, and the groove width is wider than the edge of the burner body 2. The gap between the groove width and the edge of the burner body 2 is filled with high-temperature sealing glue to ensure the sealing connection between the burner body 2 and the ceramic gasket. The second positioning groove 305 limits the installation position of the burner body 2 to avoid misinstallation.

[0034] Further, as shown in the figure, Figures 2 to 4 the first gasket 302 is provided with a third positioning groove 306 near the side of the burner body 2, which is matched with the position and size of the elastic member 6.

[0035] Further, the mounting bracket 5 is provided with a limiting groove 501 matched with the position and size of the elastic member 6.

[0036] The position of the elastic member 6 is positioned by the third positioning groove 306 and the limiting groove 501.

[0037] Further, as shown in the figure, Figure 1 the locking mechanism 4 comprises: a first fixed bracket 401 fixedly installed on the opposite side wall of the stack body 1; a second fixed bracket 402 fixedly installed on the opposite side wall of the burner body 2; an adjusting screw 403, the axis direction of which is perpendicular to the axis of the stack body 1, and the adjusting screw 403 passes through the first fixed bracket 401 or the second fixed bracket 402; a locking nut 404 threadedly connected to the end of the adjusting screw 403.

[0038] In this embodiment, one end of the adjusting screw 403 is fixedly installed on the first fixed bracket 401, and the other end passes through the second fixed bracket 402, and the stack body 1 and the burner body 2 are fixedly connected by the locking nut 404.

[0039] In some optional embodiments, the adjusting screw 403 passes through the first fixed bracket 401 and the second fixed bracket 402 at both ends, and both ends are locked by the locking nut 404.

[0040] In some alternative embodiments, the locking mechanism 4 can also be a hydraulic tensioning linkage, a hydraulic cylinder is fixed on the side wall of the stack body 1 through the first fixed frame 401, and the piston rod end is hinged with the ear plate on the burner body 2. When starting, the hydraulic system will stretch the linkage to a set length, and the pressure will be locked through the pressure retaining valve to make the linkage generate a constant tensioning force.

[0041] In some alternative embodiments, the locking mechanism 4 can also be a magnetic coupling locking system, a permanent magnet array is embedded in the abutting surface of the stack and the burner respectively, a closed magnetic circuit is formed through the yoke to generate a continuous attractive force. When disassembling, a short-time pulse current is passed through the unlocking coil to offset the magnetic field of the permanent magnet to achieve separation.

[0042] By rotating the locking nut 404, the gap and compression force between the stack body 1 and the burner body 2 can be flexibly adjusted, which not only ensures that the gasket assembly 3 is always in a suitable compression state during the working process to maintain stable sealing effect, but also can compensate for the size change caused by thermal expansion and cold shrinkage in cooperation with the elastic member 6 during the cold machine process to prevent sealing and gas leakage. The split structure design makes it easy to disassemble the stack body 1 and the burner body 2 by only loosening the locking nut 404 when maintaining or replacing the gasket assembly 3 and the mixing device, which reduces the maintenance difficulty and time cost of the equipment, improves the efficiency of performance testing and optimization, and reduces the repeated processing cost of test tools.

[0043] Further, the burner body 2 is provided with a flow collector 202 away from the stack body 1.

[0044] The flow collector is tapered from the end away from the burner body 2, and the flow collector 202 integrates an exhaust flow collection channel and an igniter base. The igniter base is made of 310S stainless steel, and the inner wall is provided with internal threads for threaded connection with the igniter. The igniter base and the flow collector 202 are rigidly connected by welding. In actual working process, the combustible mixed gas from the outlet of the stack body 1 first passes through the adjustable gasket assembly 3 reserved between the stack body 1 and the catalytic burner body 2, and different forms of mixing devices such as cyclone plate and porous medium can be flexibly assembled to experimentally verify the mixing effect by changing the gas flow field characteristics. The optimized mixed gas enters the burner body 2 and forms stable laminar or turbulent flow under the constraint of the flow guide channel, and is uniformly delivered into the combustion chamber. When the mixed gas contacts the high temperature area of the silicon carbide igniter, it is quickly ignited, and when the carrier temperature rises to the catalytic combustion demand temperature, efficient flameless combustion is carried out under the action of the catalytic coating, and finally discharged through the tapered outlet of the exhaust flow collector 202. The outlet adopts variable cross-section design, which can realize the control of exhaust back pressure by adjusting the throat diameter to ensure the stability and efficiency of the combustion process.

[0045] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0047] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A catalytic combustor device for SOFC, characterized in that, It includes: The fuel cell stack body (1) has a reaction gas inlet (101) at one end and a reaction gas outlet (102) at the other end. The burner body (2) has a mixed gas inlet (201) at one end, and the mixed gas inlet (201) faces the reaction gas outlet (102) of the fuel cell body (1). Gasket assembly (3) seals the connection between the reaction gas outlet (102) and the mixed gas inlet (201), and the gasket assembly (3) has a cavity (301) for accommodating the mixing device. The locking mechanism (4) connects the fuel cell stack body (1) and the burner body (2).

2. The catalytic combustor device for SOFC as described in claim 1, characterized in that: A mounting bracket (5) is fixedly installed on the opposite side wall of the burner body (2), and an elastic element (6) is provided between the mounting bracket (5) and the gasket assembly (3).

3. The catalytic combustor device for SOFC as described in claim 2, characterized in that: The gasket assembly (3) comprises stacked components: The first gasket (302) is sealed to the burner body (2), and its projection surface on the burner body (2) is larger than that of the burner body (2). A plurality of second gaskets (303) seal the connection between the first gasket (302) and the stack body (1).

4. The catalytic combustor device for SOFC as described in claim 2, characterized in that: The mounting bracket (5) is provided with a limiting groove (501) that matches the position and size of the elastic element (6).

5. The catalytic combustor device for SOFC as described in claim 3, characterized in that: The first gasket (302) has a first positioning groove (304) on the side near the second gasket (303), and the second gasket (303) fits into the first positioning groove (304).

6. The catalytic combustor device for SOFC as described in claim 3, characterized in that: The first gasket (302) has a second positioning groove (305) on the side near the burner body (2), and the burner body (2) fits into the second positioning groove (305).

7. The catalytic combustor device for SOFC as described in claim 3, characterized in that: The first gasket (302) has a third positioning groove (306) on the side near the burner body (2) that matches the position and size of the elastic element (6).

8. The catalytic combustor device for SOFC as described in claim 6, characterized in that: The second positioning groove (305) is provided with sealant.

9. The catalytic combustor device for SOFC as described in claim 1, characterized in that: The locking mechanism (4) includes: The first fixing frame (401) is fixedly installed on the opposite side wall of the fuel cell stack body (1); The second mounting bracket (402) is fixedly installed on the opposite side wall of the burner body (2); The adjusting screw (403) is perpendicular to the axis of the fuel cell body (1) and passes through the first fixing frame (401) or the second fixing frame (402). A lock nut (404) is threaded to the end of the adjusting screw (403).

10. The catalytic combustor device for SOFC as described in claim 1, characterized in that: The burner body (2) is provided with a current collector shroud (202) at the end away from the fuel cell body (1).

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