Burner, natural gas reformer and SOFC power generation system

Abstract

The present invention discloses a burner, a natural gas reforming device and a SOFC power generation system. The burner includes a positioning cylinder, a wind chamber partition, a temperature regulating cylinder, a premixing hood, a premixer, a gas inlet pipe and an air inlet duct. The wind chamber partition is located in the positioning cylinder, and the space below the wind chamber partition constitutes a heat preservation chamber; the temperature regulating cylinder is connected above the positioning cylinder, and there is an air distribution plate at the connection between the temperature regulating cylinder and the positioning cylinder, and there are air distribution holes on the air distribution plate. The temperature regulating cylinder is connected with the positioning cylinder, and an ignition device is arranged therein; the premixing hood is connected between the air distribution plate and the wind chamber partition, and the space surrounded by the premixing hood, the air distribution plate and the positioning cylinder constitutes an air distribution chamber; the premixer is located in the premixing hood and is connected with the premixing hood and the temperature regulating cylinder; the gas inlet pipe is connected with the premixer; and the air inlet duct is connected to the air distribution chamber. According to the burner of the present invention, the flame is stable and is not affected by the air volume; the temperature adjustment range is wide, which can meet the requirements of low temperature, long-term slow start-up, and fast start-up.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a burner, a natural gas reforming device and a SOFC power generation system. Background Art

[0002] SOFC (Solid Oxide Fuel Cell) generates electricity through electrochemical reactions and has many advantages: high power generation efficiency, which is about 50% to 60% at the current technical level; it has no moving parts and does not generate vibration and noise; its operating temperature is roughly between 700 and 800°C, and the chemical properties of nitrogen are stable within this temperature range, and it does not produce nitrogen oxides, which is environmentally friendly; it does not require high gas source quality, and hydrogen-rich gas is sufficient, and the fuel is widely adaptable. Therefore, due to the energy-saving and environmentally friendly properties of SOFC, it is regarded as one of the important ways to utilize new energy in the future.

[0003] The hydrogen-rich gas used by SOFC needs to be generated by reforming hydrogen production equipment. The reaction of preparing hydrogen is an endothermic reaction, and a heating device is required to provide the heat required for the reaction. Existing reforming hydrogen production equipment mainly provides heat source by electric heating. A small number of reforming hydrogen production equipment that uses fossil fuels for heating also need to continuously introduce fuel from the outside. Reforming hydrogen production equipment that uses fossil fuels for heating mostly releases heat by direct combustion or catalytic combustion. Reforming hydrogen production equipment that uses catalytic combustion has the defects of complex structure, difficult maintenance, high cost, slow heating and long start-up time; the burner of reforming hydrogen production equipment that uses direct combustion has a large structure and has the defects of difficult ignition, unstable combustion and incomplete combustion.

[0004] Therefore, it is necessary to provide a burner, a natural gas reforming device and a SOFC power generation system to at least partially solve the problems in the prior art. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, a first aspect of the present invention provides a burner, wherein the SOFC power generation system includes a fuel cell stack, and the burner includes:

[0007] Positioning cylinder;

[0008] An air chamber partition, wherein the air chamber partition is located inside the positioning cylinder, and the space below the air chamber partition in the positioning cylinder constitutes a heat preservation cavity;

[0009] A temperature regulating cylinder, the temperature regulating cylinder is connected to the top of the positioning cylinder, an air distribution plate is provided at the connection between the temperature regulating cylinder and the positioning cylinder, air distribution holes are opened on the air distribution plate, the temperature regulating cylinder is connected to the positioning cylinder, and an ignition device is provided in the temperature regulating cylinder;

[0010] A premixing hood, wherein the premixing hood is connected between the air distribution plate and the air chamber partition plate, and the space enclosed by the premixing hood, the air distribution plate and the positioning tube constitutes an air distribution cavity;

[0011] A premixer, the premixer is located in the premixing air hood and is connected to the premixing air hood and the temperature regulating cylinder;

[0012] a gas inlet pipe, the gas inlet pipe being in communication with the premixer and being used for inputting fuel into the premixer;

[0013] The air inlet pipe is connected to the air distribution cavity and simultaneously delivers air to the premixer and the temperature regulating cylinder.

[0014] According to the burner of the natural gas reforming device for the SOFC power generation system of the present invention, the flame generated by the gas is stable and is not affected by the air volume; the temperature adjustment range is wide, which can meet both the low-temperature long-term slow start-up requirements and the fast start-up requirements; the ignition is simple and the operation is convenient.

[0015] Furthermore, the positioning tube is constructed as a tube with a closed bottom end, the premixer passes through the wind chamber partition, the gas inlet pipe passes through the positioning tube from the bottom of the burner and is connected to the premixer, and a perforation is opened on the outer wall of the premixer.

[0016] Furthermore, the temperature regulating cylinder is constructed as a cylinder with openings at both ends, the outer diameter of the temperature regulating cylinder corresponds to the inner diameter of the positioning cylinder, the temperature regulating cylinder is inserted into the positioning cylinder from above the positioning cylinder, a positioning port is provided at the upper part of the premixing air hood, and the temperature regulating cylinder is connected to the premixing air hood through the positioning block.

[0017] Furthermore, the air inlet pipe is provided with an air flow regulating valve, and the gas inlet pipe is provided with a gas regulating valve.

[0018] Furthermore, the burner further comprises a combustion nozzle, which is connected to the premixer from above the premixer, and the ignition device is located on the side of the combustion nozzle and is separated from the combustion nozzle.

[0019] The premixer is at least partially constructed as a variable diameter structure with wide ends and narrow middle in the length direction of the positioning tube, so as to increase the speed of the mixed gas entering the combustion nozzle.

[0020] Furthermore, the burner further comprises a flame detection device, which is arranged at the side of the combustion nozzle and is spaced apart from the combustion nozzle and the ignition device.

[0021] Furthermore, the burner also includes a flame protection cover, which is cylindrical and is sleeved on the outside of the flame detection device, the ignition device and the combustion nozzle.

[0022] Furthermore, a fire viewing hole is provided at the bottom of the positioning tube for observing the burning condition of the flame and cooperating with the flame detection device to detect the combustion start state.

[0023] A second aspect of the present invention provides a natural gas reforming device for a SOFC power generation system, wherein the SOFC power generation system comprises a fuel cell stack, and the natural gas reforming device comprises:

[0024] Reformer heat exchangers for reforming natural gas into hydrogen-rich gas; and

[0025] The burner described in the first aspect is located below the reforming heat exchanger and is connected to the reforming heat exchanger, and is used to provide the reforming heat exchanger with the heat gas required to start the reforming reaction.

[0026] According to the natural gas reforming device for SOFC power generation system of the present invention, the reforming heat exchanger uses a burner to provide heat for the reforming reaction, the flame is stable and is not affected by the air volume; the temperature adjustment range is wide, which can meet both the low temperature and long-term slow start-up requirements and the fast start-up requirements; the ignition is simple and the operation is convenient.

[0027] A third aspect of the present invention provides a SOFC power generation system, characterized by comprising:

[0028] A fuel cell stack, the fuel cell stack comprising a cathode exhaust port and an anode air inlet port;

[0029] A reforming heat exchanger, comprising a reforming exhaust pipe, the reforming exhaust pipe being in communication with the anode air inlet, the reforming heat exchanger being used for reforming natural gas into hydrogen-rich gas and providing the hydrogen-rich gas to the fuel cell stack through the reforming exhaust pipe;

[0030] The burner described in the first aspect is located below the reforming heat exchanger and is connected to the reforming heat exchanger. The air inlet pipe is connected to the cathode gas outlet to transport the cathode gas from the fuel cell stack to the reforming heat exchanger.

[0031] According to the SOFC power generation system of the present invention, the natural gas reforming device uses a burner to provide heat for the reforming reaction, and the gas flame is stable and is not affected by the air volume; the temperature adjustment range is wide, which can meet both the low-temperature and long-term slow start-up requirements and the fast start-up requirements; the ignition is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0033] In the attached figure:

[0034] Figure 1 is a three-dimensional schematic diagram of a natural gas reforming device according to the present invention;

[0035] Figure 2 for Figure 1 A cross-sectional schematic diagram of a natural gas reforming device;

[0036] Figure 3 is a three-dimensional schematic diagram of a burner of a natural gas reforming device according to the present invention;

[0037] Figure 4 for Figure 3 A schematic cross-sectional view of a burner;

[0038] Figure 5 The figure is a schematic diagram of the working process of the burner of the natural gas reforming device according to the present invention.

[0039] Description of reference numerals:

[0040] 100: Natural gas reforming device 200: Reforming heat exchanger

[0041] 300: Burner 310: Gas inlet pipe

[0042] 311: Gas nozzle 320: Air enters the pipeline

[0043] 330: Premixer 331: Combustion nozzle

[0044] 332: Ignition device 333: Flame detection device

[0045] 340: Positioning tube 341: Air chamber partition

[0046] 342: Premixing hood 343: Insulation chamber

[0047] 344: air distribution chamber 350: temperature control cylinder

[0048] 351: Air distribution plate 352: Positioning block

[0049] 353: Flame protection cover 360: Fire viewing hole DETAILED DESCRIPTION

[0050] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0051] In order to fully understand the present invention, a detailed description will be provided in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0053] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the concept of these exemplary embodiments to those of ordinary skill in the art.

[0054] Figure 3 and Figure 4 A burner of a natural gas reforming device for a SOFC power generation system according to a preferred embodiment of the present invention is shown, including a positioning cylinder 340, a wind chamber partition 341, a temperature adjustment cylinder 350, a premixing wind hood 342, a premixer 330, a gas inlet pipe 310 and an air inlet pipe 320.

[0055] Among them, the air chamber partition 341 is located inside the positioning cylinder 340, and the space below the air chamber partition 341 in the positioning cylinder 340 constitutes a heat preservation chamber 343; the temperature regulating cylinder 350 is connected to the top of the positioning cylinder 340, and an air distribution plate 351 is provided at the connection between the temperature regulating cylinder 350 and the positioning cylinder 340, and a plurality of air distribution holes are opened on the air distribution plate 351, and the diameter of the air distribution holes is about 2 mm. The temperature regulating cylinder 350 is connected with the positioning cylinder 340, and the temperature regulating cylinder 350 is provided with an ignition device 332; the premixing hood 342 is connected between the air distribution plate 351 and the air chamber partition plate 341, and the space enclosed by the premixing hood 342, the air distribution plate 351 and the positioning cylinder 340 constitutes an air distribution cavity 344; the premixer 330 is located in the premixing hood 342 and is connected with the premixing hood 342 and the temperature regulating cylinder 350; the gas inlet pipe 310 is connected with the premixer 330, and is used to input fuel into the premixer 330; the air inlet pipe 320 is connected to the air distribution cavity 344, and at the same time, air is transported to the premixer 330 and the temperature regulating cylinder 350.

[0056] The burner of the natural gas reforming device for the SOFC power generation system according to the present invention has a stable flame and is not affected by the air volume; the temperature adjustment range is wide, which can meet both the low-temperature and long-term slow start-up requirements and the fast start-up requirements; the ignition is simple and the operation is convenient.

[0057] When the burner of the present invention is used as a component of a natural gas reforming device for a SOFC power generation system, one end of the air inlet pipe 320 is connected to the air distribution chamber 344, and the other end is connected to the cathode exhaust port of the stack, and at the same time, air from the cathode of the stack is transported to the premixer 330 and the temperature regulating cylinder 350. Figures 1 to 5 The natural gas reforming device for the SOFC power generation system of the present invention is described in detail.

[0058] Please refer to Figure 1 and Figure 2 , the natural gas reforming device 100 includes a reforming heat exchanger 200 and a burner 300. The reforming heat exchanger 200 is used to carry out the reforming reaction, and the burner 300 is located below the reforming heat exchanger 200, and is used to provide heat for the reforming reaction during the startup phase of the SOFC power generation system. Thus, the natural gas reforming device 100 converts the raw gas into reformed gas, and provides the reformed gas to the stack of the SOFC power generation system for electrochemical reaction, converting chemical energy into electrical energy. The raw gas is preferably natural gas, and more preferably a mixture of natural gas and water vapor. The reformed gas is preferably hydrogen-rich gas. The fuel used by the burner 300 is preferably natural gas. The burner 300 is preferably made of stainless steel. The natural gas reforming device 100 is about 1m in length, about 20cm in diameter, and weighs less than 20kg, and mainly provides reformed gas for a stack with a power level of about 1kw.

[0059] Please refer to the following Figure 3 , Figure 4 and Figure 5 The main body of the burner 300 is composed of a positioning tube 340 and a temperature regulating tube 350. The positioning tube 340 is configured as a tube with a closed bottom end, and the temperature regulating tube 350 is configured as a tube with open ends. The outer diameter of the temperature regulating tube 350 corresponds to the inner diameter of the positioning tube 340, so that the temperature regulating tube 350 can be inserted into the positioning tube 340 from above. The outer diameter of the temperature regulating tube 350 also corresponds to the inner diameter of the bottom of the reforming heat exchanger 200, so that the temperature regulating tube 350 can be easily connected to the reforming heat exchanger 200.

[0060] Specifically, refer to Figure 4 The positioning cylinder 340 is provided with a premixer 330, a wind chamber baffle 341 and a premixing air cover 342. The wind chamber baffle 341 is located at the upper part of the positioning cylinder 340, and the space below the wind chamber baffle 341 constitutes a heat preservation chamber 343. The heat preservation chamber 343 is at least partially filled with heat preservation materials to isolate the high temperature of the temperature regulating cylinder 350 and ensure the safety of the air inlet end of the gas inlet pipe 310 when the burner 300 is running.

[0061] The premixing hood 342 is located above the air chamber partition 341 and connected to the air chamber partition 341. The premixing hood 342 and the positioning cylinder 340 are roughly concentric structures, and the space between the premixing hood 342 and the side wall of the positioning cylinder 340 constitutes an air distribution chamber 344. A positioning port is provided at the upper part of the premixing hood 342, and the temperature regulating cylinder 350 is connected to the premixing hood 342 through a positioning block 352. The premixer 330 is arranged inside the premixing hood 342 and passes through the air chamber partition 341, and a perforation is provided on the outer wall of the premixer 330. A plurality of small holes are provided on the premixing hood 342, each of which has a diameter of about 8 mm, and the plurality of small holes are arranged in a circle, so that the premixer 330 is connected to the air distribution chamber 344 via the perforation and the small holes on the premixing hood 342.

[0062] The gas inlet pipe 310 passes through the positioning cylinder 340 from the bottom of the burner 300 and is connected to the premixer 330, which is used to input fuel into the premixer 330; one end of the air inlet pipe 320 is connected to the air distribution chamber 344, and the other end is connected to the cathode exhaust port of the fuel cell stack. A gas nozzle 311 is provided at the top of the gas inlet pipe 310, and the fuel from the gas inlet pipe 310 is sprayed into the premixer 330 through the gas nozzle 311, and the air and fuel from the cathode of the fuel cell stack are mixed into a mixed gas in the premixer 330.

[0063] The bottom of the temperature regulating cylinder 350 is provided with an air distribution plate 351, on which air distribution holes are opened. The temperature regulating cylinder 350 also has a combustion nozzle 331, an ignition device 332, a flame detection device 333 and a flame protection cover 353. The combustion nozzle 331 is arranged above the premixer 330 and is connected to the premixer 330. The mixed gas mixed in the premixer 330 is ejected from the combustion nozzle 331. The combustion nozzle 331 is preferably made of a conductive material. The top surface of the combustion nozzle 331 is provided with 8 2mm jet holes so that the mixed gas can be evenly ejected.

[0064] The ignition device 332 and the flame detection device 333 are arranged on both sides of the combustion nozzle 331, and the three are spaced apart. The ignition device 332 is used to emit an arc to the combustion nozzle 331 to ignite the mixed gas. The flame detection device 333 is used to detect the combustion condition of the flame. When successful ignition is detected, the ignition device 332 stops discharging. The flame protection cover 353 is constructed in a cylindrical shape and is sleeved on the outside of the flame detection device 333, the ignition device 332 and the combustion nozzle 331, and is used to maintain the stability of the flame when burning with a large air volume and / or low temperature.

[0065] In addition, the upper part of the premixer 330 is constructed as a variable diameter structure that is narrow at first and wide at the end, so as to increase the speed at which the mixed gas enters the combustion nozzle 331. The variable diameter structure may be a venturi structure. A flame viewing hole 360 ​​is provided at the bottom of the positioning cylinder 340 for observing the combustion of the flame. The flame viewing hole 360 ​​extends into the heat preservation chamber 343 and passes through the heat preservation material so as to observe the flame. The flame viewing hole 360 ​​is preferably used in conjunction with the flame detection device 333 to detect the start-up state of the burner.

[0066] An air flow regulating valve is provided on the air inlet pipe 320, and a gas regulating valve is provided on the gas inlet pipe 310 to facilitate the regulation of the flow. The bottom of the burner 300 also has a fastening base for fixing the burner 300, and the fastening base is preferably a flange.

[0067] For the operation of burner 300, please refer to Figure 5 The air from the cathode of the stack is divided into primary air and secondary air in the air distribution chamber 344. The primary air passes through the air distribution chamber 344, the small holes of the premixing air cover 342 and the primary air flow path of the premixer 330 in sequence and enters the premixer 330 to mix with the fuel; the secondary air passes through the air distribution chamber 344 and the secondary air flow path of the air distribution holes in sequence and enters the temperature regulating cylinder 350 to mix with the smoke generated by combustion and perform afterburning.

[0068] Specifically, the burner 300 provides heat for the reforming reaction during the startup phase of the natural gas reforming device 100. A blower is provided at the cathode inlet of the fuel cell stack, so that the air flows through the cathode and is discharged from the cathode exhaust port, and then enters the air distribution chamber 344 through the air inlet pipe 320. The primary air first enters the premixing hood 342 through the small holes on the premixing hood 342, and then enters the premixer 330 through the perforations on the outer wall of the premixer 330 to mix with the fuel into a mixed gas. The mixed gas is ejected from the combustion nozzle 331 and ignited by the ignition device 332 to heat the reforming heat exchanger 200. The secondary air directly passes upward through the air distribution holes into the reforming heat exchanger 200 to supplement oxygen so that the fuel is completely burned.

[0069] As the electrochemical reaction in the stack proceeds, the temperature of the stack gradually increases, and the temperature of the cathode gas also gradually increases, and it contains some unreacted oxygen. The high-temperature cathode gas enters the reforming heat exchanger 200 from the burner 300, and the sensible heat carried by the cathode gas provides heat for the reforming reaction.

[0070] Therefore, after the startup phase, the maintenance phase begins, and the heat generated by the reaction of the fuel cell stack and the sensible heat carried by the cathode gas are used to maintain the reforming reaction, which can reduce or even shut down the fuel input in the burner 300.

[0071] The present invention also provides a SOFC power generation system, comprising a fuel cell stack, a natural gas reforming device 100 and a control device. The fuel cell stack is a solid oxide fuel cell, in which a temperature sensor is arranged.

[0072] The supplementary combustion gas regulating valve, the fuel gas regulating valve and the air flow regulating valve can all be electrically controlled regulating valves. The control device is electrically connected to the temperature sensor, the ignition device 332, the supplementary combustion gas regulating valve, the fuel gas regulating valve and the air flow regulating valve, and is configured to control the opening of the supplementary combustion gas regulating valve, the fuel gas regulating valve and the air flow regulating valve according to the temperature of the fuel cell stack.

[0073] Specifically, the control device is further configured to control the gas regulating valve and the air flow regulating valve to open during the startup phase of the SOFC power generation system, and control the ignition device 332 to ignite so as to heat the reforming heat exchanger 200 .

[0074] When the temperature in the reforming heat exchanger 200 reaches the reforming reaction temperature, the reforming heat exchanger 200 starts to deliver reforming gas to the anode of the fuel cell stack, and an electrochemical reaction starts to occur in the fuel cell stack.

[0075] As the reaction in the stack proceeds, the temperature of the stack gradually increases, and the temperature of the cathode gas and the anode gas also gradually increases, and can be returned to the reforming heat exchanger 200 for additional heating. At this time, the control device controls the gas regulating valve to reduce the opening as the temperature rises, thereby reducing fuel consumption.

[0076] As the electrochemical reaction in the stack proceeds, the temperature of the cathode gas and the anode gas can reach or exceed the reforming reaction temperature, at which time the control device controls the gas regulating valve to close. The startup phase of the SOFC power generation system ends and enters the maintenance phase, using the heat generated by the stack reaction and the reaction heat of the cathode gas and the anode gas to maintain the reforming reaction in the reforming heat exchanger 200, without the need for external fuel input, which can save energy and reduce consumption, and has high economic and social benefits.

[0077] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0078] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A burner, characterized in that: The burner comprises: A positioning cylinder, wherein the positioning cylinder is in the shape of a cylinder with a closed bottom end; An air chamber partition, wherein the air chamber partition is located inside the positioning cylinder, and the space below the air chamber partition in the positioning cylinder constitutes a heat preservation cavity; A temperature regulating cylinder, the temperature regulating cylinder is connected to the top of the positioning cylinder, an air distribution plate is provided at the connection between the temperature regulating cylinder and the positioning cylinder, air distribution holes are opened on the air distribution plate, the temperature regulating cylinder is connected to the positioning cylinder, and an ignition device is provided in the temperature regulating cylinder; A premixing hood, wherein the premixing hood is connected between the air distribution plate and the air chamber partition plate, the space enclosed by the premixing hood, the air distribution plate and the positioning tube constitutes an air distribution cavity, and a plurality of small holes are provided on the premixing hood; A premixer, the premixer is located in the premixing hood and is connected to the premixing hood and the temperature regulating cylinder, the premixer passes through the air chamber partition, a through hole is provided on the outer wall of the premixer, and the premixer is connected to the air distribution cavity via the through hole and the small hole on the premixing hood; A gas inlet pipe, the gas inlet pipe passes through the positioning cylinder from the bottom of the burner and is connected to the premixer, and the gas inlet pipe is used to input fuel into the premixer; An air inlet duct is connected to the air distribution cavity and simultaneously delivers air to the premixer and the temperature regulating cylinder; A combustion nozzle is connected to the premixer from above the premixer, and the ignition device is located on the side of the combustion nozzle and is spaced apart from the combustion nozzle.

2. The burner according to claim 1, characterized in that The temperature regulating cylinder is constructed in a cylindrical shape with openings at both ends. The outer diameter of the temperature regulating cylinder corresponds to the inner diameter of the positioning cylinder. The temperature regulating cylinder is inserted into the positioning cylinder from above the positioning cylinder. A positioning port is provided at the upper part of the premixing air hood. The temperature regulating cylinder is connected to the premixing air hood through a positioning block.

3. The burner according to claim 1, characterized in that The air inlet pipe is provided with an air flow regulating valve, and the gas inlet pipe is provided with a gas regulating valve.

4. The burner according to claim 1, characterized in that The premixer is at least partially constructed as a variable diameter structure with wide ends and narrow middle in the length direction of the positioning tube, so as to increase the speed of the mixed gas entering the combustion nozzle.

5. The burner according to claim 4, characterized in that The burner further includes a flame detection device, which is disposed at a side of the combustion nozzle and is spaced apart from the combustion nozzle and the ignition device.

6. The burner according to claim 5, characterized in that The burner further comprises a flame protection cover which is cylindrical and is sleeved on the outside of the flame detection device, the ignition device and the combustion nozzle.

7. The burner according to claim 1, characterized in that A fire viewing hole is provided at the bottom of the positioning tube for observing the burning condition of the flame.

8. A natural gas reforming device for a SOFC power generation system, the SOFC power generation system comprising a fuel cell stack, characterized in that: The natural gas reforming device comprises: Reformer heat exchangers for reforming natural gas into hydrogen-rich gas; and The burner described in any one of claims 1 to 7 is located below the reforming heat exchanger and is connected to the reforming heat exchanger, and is used to provide the reforming heat exchanger with the heat gas required to start the reforming reaction.

9. A SOFC power generation system, characterized in that: include: A fuel cell stack, the fuel cell stack comprising a cathode exhaust port and an anode air inlet port; A reforming heat exchanger, comprising a reforming exhaust pipe, the reforming exhaust pipe being in communication with the anode air inlet, the reforming heat exchanger being used for reforming natural gas into hydrogen-rich gas and providing the hydrogen-rich gas to the fuel cell stack through the reforming exhaust pipe; as well as The burner described in any one of claims 1-7 is located below the reforming heat exchanger and is connected to the reforming heat exchanger, and the air inlet pipe is connected to the cathode exhaust port to transport the cathode gas from the fuel cell stack to the reforming heat exchanger.

Images