Top combustion type methane reforming hydrogen production device

Abstract

The utility model relates to the technical field of reforming hydrogen production, in particular to a top combustion type methane reforming hydrogen production device which comprises a furnace body, a reaction tube and a combustor, the whole furnace body is of a hollow cylinder structure, a through hole is formed in the center of the top and used for installing a combustor, and reaction pipe holes distributed around the through hole at intervals are used for installing reaction pipes. The reaction tube is of a straight tube structure with a hemispherical end socket at one end, and a gas inlet tube for feeding biogas, a water inlet tube and a gas outlet tube are arranged at the other end; the combustor is of a concentric sleeve structure, an annular gap between the smoke pipe and the gas pipe is a smoke channel, and fuel gas and air can be introduced into the gas pipe. According to the utility model, the burner is arranged at the central position of the top of the methane reforming device, flame generated by the burner is spread downwards and then returns back to directly heat the reaction tube when meeting the furnace bottom, so that the heat transfer speed is high, and the efficiency is high. The top combustion type methane reforming hydrogen production device is compact in structure, convenient to disassemble and assemble, uniform in internal heating and high in heat exchange efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of reforming hydrogen production, in particular to a top-burning biogas reforming hydrogen production device. Background Art

[0002] Energy is an important material basis for the survival and development of human society. In the long history of the development and continuation of human civilization, every major social change is accompanied by the change of energy development and utilization technology. From the perspective of energy use structure, the current energy is mainly fossil energy such as coal, oil, and natural gas, which will emit a large amount of CO2 when used, causing a serious greenhouse effect. Hydrogen energy, as an efficient, pollution-free renewable energy, will become one of the most important parts of the energy structure in the future, playing an important role in helping to reduce carbon emissions and accelerate energy transformation.

[0003] Existing hydrogen production technologies mainly include coal gasification, water electrolysis and steam reforming. Coal gasification is a process of converting organic matter in coal into hydrogen under high temperature and high pressure under the action of a gasifying agent. Coal gasification is a mature technology with low cost, but it has large pollutant emissions and low purity of gas products. Water electrolysis is a process of passing direct current into an electrolyzer filled with electrolyte, and water molecules undergo electrochemical reactions on the electrodes to decompose into hydrogen and oxygen. This method has high product purity and few impurities, but water electrolysis is low in maturity and high in energy consumption. Steam reforming is a hydrogen production technology in which methane, methanol, etc. react with water vapor under the action of a catalyst to produce hydrogen and carbon monoxide. Steam reforming has much lower carbon emissions than coal gasification and lower cost than water electrolysis. It has the advantages of high production efficiency and low water consumption, and is currently the most promising hydrogen production technology.

[0004] Biogas is a common renewable clean energy source, with methane and carbon dioxide as its main components, and can be used as the raw gas for steam reforming hydrogen production. The key to biogas reforming hydrogen production technology is the reforming hydrogen production device. Most of the existing biogas reforming hydrogen production devices have problems such as low heating efficiency, uneven temperature field inside the device, and difficulty in loading and unloading catalysts, which affect the development of biogas reforming hydrogen production technology. Therefore, it is urgent to develop an efficient reforming hydrogen production device with uniform internal temperature and simple catalyst loading and unloading to give full play to the advantages of biogas reforming hydrogen production technology. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a top-firing biogas reforming hydrogen production device to solve the problems of low heating efficiency, uneven temperature field inside the device, and difficulty in loading and unloading catalysts in the prior art.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the top-burning biogas reforming hydrogen production device of the utility model comprises:

[0009] A furnace body, wherein the furnace body is a cylindrical structure containing a furnace cavity and having both upper and lower ends closed, and a through hole and a plurality of reaction tube holes spaced around the through hole are provided on the top of the furnace body;

[0010] A plurality of reaction tubes, each of which comprises a tube body arranged in a one-to-one correspondence in the reaction tube hole, a catalyst support frame arranged in the tube body, a flange cover arranged on the top of the tube body, and an air inlet pipe, a water inlet pipe and an air outlet pipe arranged on the flange cover; the tube body is a straight tube inserted into the furnace chamber and has a hemispherical end cap at the bottom, the air outlet pipe extends through the center of the flange cover to the bottom end close to the reaction tube; the air inlet pipe and the water inlet pipe are symmetrically distributed on the flange cover based on the air outlet pipe;

[0011] A burner, the burner comprising a flue gas pipe arranged in the through hole, a gas pipe arranged in the flue gas pipe and an ignition electrode arranged in the gas pipe; the flue gas pipe extends into the furnace cavity, the bottom end of the flue gas pipe is an open end and extends to a point close to the bottom end of the reaction tube, a plurality of smoke exhaust ports are provided on the flue gas pipe near the top surface of the furnace cavity, the top end of the flue gas pipe extends from the top of the furnace body to a predetermined height, and the ignition electrode extends from the bottom end opening of the gas pipe.

[0012] Optionally, the top of the furnace body is also covered with a furnace cover, and the furnace cover is provided with a flue gas sleeve arranged concentrically in a one-to-one correspondence with the reaction tube holes; the multiple reaction tubes are concentrically arranged in the flue gas sleeve in a one-to-one correspondence.

[0013] Optionally, a port flange is provided at the top of the tube body, and the flange cover is installed on the top of the tube body through the port flange;

[0014] The pipe body is provided with a positioning flange at a predetermined position below the port flange, and the positioning flange connects the pipe body and the flue gas sleeve.

[0015] Optionally, after the positioning flange is installed on the flue gas sleeve, the distance from the bottom end of the reaction tube to the inner bottom surface of the furnace chamber is 50 to 100 mm.

[0016] Optionally, the furnace body is provided with a temperature detection port, a pressure detection port and a fire observation hole, the pressure detection port is located between the through hole and the reaction tube hole, and the temperature detection port and the fire observation hole are arranged on the side wall of the furnace body close to the furnace bottom.

[0017] Optionally, the furnace wall of the furnace body includes a metal protective shell, a thermal insulation layer and a refractory layer from the outside to the inside.

[0018] Optionally, the catalyst support frame includes a metal mesh tube concentrically arranged in the tube body and a plurality of brackets axially spaced apart on the metal mesh tube, the bracket including a support ring connected to the metal mesh tube and a limiting rod connected to the support ring at one end and extending to the inner surface of the reaction tube at the other end.

[0019] Optionally, the distance from the bottom end of the smoke pipe to the inner bottom surface of the furnace cavity is 150 to 200 mm;

[0020] The distance from the smoke exhaust port to the top surface of the furnace cavity is 0 to 50 mm.

[0021] Optionally, the upper end of the smoke pipe is further provided with a plurality of converging smoke pipes connected to the smoke sleeve;

[0022] The smoke pipe is also provided with a smoke outlet near the top, and the smoke outlet is vertically connected to the smoke pipe.

[0023] Optionally, the bottom end of the gas pipe extends 10 to 30 mm below the smoke exhaust port; the top end of the gas pipe is provided with a first fuel gas inlet, a second fuel gas inlet and an air inlet, and the first fuel gas inlet, the second fuel gas inlet and the air inlet are respectively vertically connected to the gas pipe.

[0024] (III) Beneficial effects

[0025] The technical solution of the utility model provides a top-burning biogas reforming hydrogen production device, which overcomes the defects of low heating efficiency, uneven internal temperature field, and difficult catalyst loading and unloading of existing reforming hydrogen production devices. The device has a compact structure, easy assembly and disassembly, uniform internal temperature field, high heat exchange efficiency between flue gas and reaction tube, and can effectively realize steam reforming hydrogen production. Specifically, the device has the following beneficial effects:

[0026] (1) A top-burning burner is used to provide heat for multiple groups of reaction tubes, which has a compact structure, small footprint, and high reaction efficiency. The flame generated by the combustion of gas first propagates downward under the restraint of the flue gas pipe. On the one hand, the flue gas pipe receives the heat of the flue gas and transfers it to the reaction tube in the form of radiation. On the other hand, the flue gas pipe can restrain the flame so that it can propagate evenly downward to prevent it from spreading outward. When the flame propagates to the bottom of the furnace chamber and is blocked, it will spread evenly around, then move upward, directly contact and heat the reaction tube, and finally enter the flue gas pipe again from the exhaust port, and finally be discharged from the flue gas outlet. This structural design is sophisticated, so that the flame generated by a burner can evenly heat multiple reaction tubes, with a fast heat transfer rate, uniform temperature of the reaction tubes, and high biogas conversion efficiency.

[0027] (2) The structure of the reaction tube is ingeniously designed in this device. An outlet pipe is set in the reaction tube to separate the raw gas and the conversion gas. The raw gas enters the annular gap of the reaction tube from top to bottom to participate in the conversion, and the generated conversion gas is discharged from the outlet pipe in the center from bottom to top. The raw gas and the conversion gas do not interfere with each other, and during the flow of the two, the conversion gas can transfer heat to the raw gas to preheat the raw gas, thereby reducing the discharge temperature of the conversion gas and improving the thermal efficiency.

[0028] (3) The catalyst support frame is cleverly designed to facilitate loading the catalyst into the annular gap between the reaction tube and the catalyst support frame, preventing the catalyst from filling the reaction tube and making the outlet pipe unable to be installed. The reaction tube is designed to be a detachable structure to facilitate the loading and replacement of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the top-burning biogas reforming hydrogen production device provided by the utility model;

[0030] Figure 2 for Figure 1 A top view schematic diagram of

[0031] Figure 3 It is a schematic top view of the support of the catalyst support frame of the utility model.

[0032] [Description of Reference Numerals]

[0033] 1: furnace body; 11: shell; 12: furnace chamber; 13: reaction tube hole; 14: through hole; 15: temperature detection port; 16: pressure detection port; 17: furnace cover; 18: flue gas casing; 19: fire viewing hole;

[0034] 2: reaction tube; 21: tube body; 22: positioning flange; 23: port flange; 24: flange cover; 241: air inlet pipe; 242: water inlet pipe; 243: air outlet pipe; 25: catalyst support frame; 251: bracket; 2511: support ring; 2512: limit rod;

[0035] 3: burner; 31: flue gas pipe; 311: exhaust port; 312: converging flue gas pipe; 313: flue gas outlet; 32: fuel gas pipe; 321: first fuel gas inlet; 322: second fuel gas inlet; 323: air inlet; 33: ignition electrode. DETAILED DESCRIPTION

[0036] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] See also Figure 1 and Figure 2 The utility model provides a top-burning biogas reforming hydrogen production device, which includes a furnace body 1, a plurality of reaction tubes 2 and a burner 3. The furnace body 1 is a cylindrical structure containing a furnace cavity 12 and closed at both ends. A through hole 14 and a plurality of reaction tube holes 13 distributed at intervals around the through hole 14 are provided on the top of the furnace body 1. Specifically, the furnace body 1 has a hollow cylindrical furnace cavity 12 inside, and a truncated cone-shaped furnace top is provided on the top of the furnace body 1. A through hole 14 is provided in the center of the furnace top, and a plurality of reaction tube holes 13 distributed at intervals are provided at a suitable position around the through hole 14 (see Figure 2 In a preferred embodiment, the top of the furnace body 1 is also covered with a furnace cover 17 , and the furnace cover 17 is provided with a flue gas sleeve 18 which is arranged concentrically with the reaction tube holes 13 in a one-to-one correspondence.

[0041] The reaction tubes 2 each include a tube body 21 correspondingly arranged in the reaction tube hole 13, a catalyst support frame 25 concentrically arranged in the tube body 21, a flange cover 24 arranged on the top of the tube body 21, and an air inlet pipe 241 (for intake of biogas), a water inlet pipe 242, and an air outlet pipe 243 arranged on the flange cover 24. The tube body 21 is a straight tube inserted into the furnace chamber 12 and has a hemispherical end cap at the bottom. The air outlet pipe 243 extends through the center of the flange cover 24 to the bottom end near the reaction tube 2 (specifically, extends into the hemispherical end cap but does not contact the inner surface of the hemispherical end cap); the air inlet pipe 241 and the water inlet pipe 242 are symmetrically distributed on the flange cover 24 based on the air outlet pipe 243. The structure of the reaction tube 2 is ingeniously designed in the device. The raw gas and the conversion gas are separated by arranging an outlet pipe 243 in the reaction tube 2. The raw gas enters the annular gap in the reaction tube 2 from top to bottom to participate in the conversion, and the generated conversion gas is discharged from the center outlet pipe 243 from bottom to top. The raw gas and the conversion gas do not interfere with each other, and the conversion gas can transfer heat to the raw gas during the flow of the two gases to preheat the raw gas, thereby reducing the discharge temperature of the conversion gas and improving the thermal efficiency.

[0042] In a preferred embodiment, a plurality of reaction tubes 2 are concentrically arranged in the flue gas sleeve 18 in a one-to-one correspondence. The top end of the tube body 21 is an open end and is provided with a port flange 23, and the flange cover 24 is installed on the top end of the tube body 21 through the port flange 23. In addition, the tube body 21 is provided with a positioning flange 22 at a predetermined position below the port flange 23, and the positioning flange 22 connects the tube body 21 and the flue gas sleeve 18, and an annular gap exists between the tube body 21 and the flue gas sleeve 18. Among them, in order to ensure the reforming hydrogen production efficiency, after the positioning flange 22 is installed in the flue gas sleeve 18, the distance from the bottom end of the reaction tube 2 to the inner bottom surface of the furnace chamber 12 can be preferably 50 to 100 mm.

[0043] See also Figure 1 and Figure 3 The catalyst support frame 25 includes a metal mesh tube concentrically arranged in the tube body 21 and a plurality of brackets 251 evenly spaced along the axial direction on the metal mesh tube, and the bracket 251 includes a support ring 2511 connected to the metal mesh tube and a limit rod 2512 connected to the support ring 2511 at one end and extending to the inner surface of the reaction tube 2 at the other end. By cleverly designing the catalyst support frame 25, it is convenient to load the catalyst in the annular gap between the reaction tube 2 and the metal mesh tube, and prevent the catalyst from filling the reaction tube 2 and making the outlet pipe 243 unable to be installed. Moreover, the reaction tube 2 is designed as a detachable structure to facilitate the loading and replacement of the catalyst. Specifically, before the device is operated, the catalyst can be first loaded into the annular gap between the reaction tube 2 and the metal mesh tube, and then the outlet pipe 243 is installed. When the catalyst needs to be replaced, the outlet pipe 243 can be taken out, and then the reaction tube 2 is taken out from the reaction tube hole 13, and then the reaction tube 2 is inverted to pour out the failed catalyst.

[0044] Furthermore, the burner 3 is a concentric sleeve structure, specifically including a flue gas pipe 31 concentrically arranged in the through hole 14, a gas pipe 32 concentrically arranged in the flue gas pipe 31, and an ignition electrode 33 concentrically arranged in the gas pipe 32, and the annular gap between the flue gas pipe 31 and the gas pipe 32 is a flue gas passage. The flue gas pipe 31 is a straight pipe inserted into the furnace cavity 12, the bottom end of the flue gas pipe 31 is an open end and extends to the bottom end close to the reaction tube 2, and the distance from the bottom end of the flue gas pipe 31 to the inner bottom surface of the furnace cavity 12 is preferably 150 to 200 mm, and a plurality of exhaust ports 311 are also opened on the flue gas pipe 31 near the inner top surface of the furnace cavity 12; the top end of the flue gas pipe 31 extends from the top of the furnace body 1 to a predetermined height, and the ignition electrode 33 extends from the bottom end opening of the gas pipe 32.

[0045] In a preferred embodiment, the distance from the exhaust port 311 to the top surface of the furnace chamber 12 can be 0 to 50 mm. The upper end of the smoke pipe 31 is also provided with a plurality of converging smoke pipes 312 fixedly connected to the smoke sleeve 18. Since there is an annular gap between the smoke sleeve 18 and the reaction tube 2, the smoke in the furnace chamber 12 can flow into the smoke sleeve 18, and flow into the smoke pipe 31 from the reflux smoke pipe 312 and finally be discharged. In this process, the smoke can preheat the raw gas inside the reaction tube 2. The smoke pipe 31 is also provided with a smoke outlet 313 near the top, and the smoke outlet 313 is vertically connected to the smoke pipe 31. In order to ensure combustion efficiency and prevent flames from spreading from the smoke exhaust port 311, the bottom end of the gas pipe 32 extends 10 to 30 mm below the smoke exhaust port 311; the top of the gas pipe 32 is provided with a first fuel gas inlet 321, a second fuel gas inlet 322 and an air inlet 323, and the first fuel gas inlet 321, the second fuel gas inlet 322 and the air inlet 323 are respectively vertically connected to the gas pipe 32 for introducing fuel gas and air into the gas pipe 32.

[0046] This device adopts a top-burning burner to provide heat for multiple groups of reaction tubes 2, which has a compact structure, small footprint and high reaction efficiency. The flame generated by the combustion of gas first propagates downward under the restraint of the flue gas pipe 31. On the one hand, the flue gas pipe 31 receives the heat of the flue gas and transfers it to the reaction tube 2 in the form of radiation. On the other hand, the flue gas pipe 31 can restrain the flame so that it can propagate downward evenly and prevent it from spreading outward. When the flame propagates to the bottom of the furnace chamber 12, it is blocked and then spreads evenly around, then moves upward, directly contacts and heats the reaction tube 2, and finally enters the flue gas pipe 31 again from the exhaust port 311, and is finally discharged from the flue gas outlet 313. This structural design is sophisticated, so that the flame generated by a burner 3 can evenly heat multiple reaction tubes 2, the heat transfer rate is fast, the temperature of the reaction tube 2 is uniform, and the biogas conversion efficiency is high.

[0047] In addition, in order to be able to more accurately and efficiently control the biogas reforming hydrogen production process, the furnace body 1 is also provided with a temperature detection port 15, a pressure detection port 16 and a fire observation hole 19. The pressure detection port 16 is located between the through hole 14 and the reaction tube hole 13, and the temperature detection port 15 and the fire observation hole 19 are arranged on the side wall of the furnace body 1 near the furnace bottom. As a preferred method, the furnace wall 11 of the furnace body 1 adopts a three-layer structure, which includes a metal protective shell, a thermal insulation layer and a refractory layer from the outside to the inside. Among them, the metal shell can be carbon steel, the thermal insulation layer can be made of aluminum silicate fiber wool or fiberboard, and the refractory layer can be made of refractory castables or refractory bricks.

[0048] The top-burning biogas reforming hydrogen production device provided by the utility model has a simple structural design. The burner 3 arranged in the center can heat multiple groups of reaction tubes 2 at the same time. It has a compact structure, high heat transfer efficiency, uniform temperature field inside the reaction tubes 3, and simple catalyst loading and unloading.

[0049] It should be understood that the above description of the specific embodiments of the utility model is only for illustrating the technical route and features of the utility model, and its purpose is to enable those skilled in the art to understand the content of the utility model and implement it accordingly, but the utility model is not limited to the above specific implementation methods. All changes or modifications made within the scope of the claims of the utility model should be included in the protection scope of the utility model.

Claims

1. A top-fired biogas reforming hydrogen production device, characterized in that: include: A furnace body (1), the furnace body (1) being a cylindrical structure containing a furnace chamber (12) and having both upper and lower ends closed, the top of the furnace body (1) being provided with a through hole (14) and a plurality of reaction tube holes (13) spaced around the through hole (14); A plurality of reaction tubes (2), each of the reaction tubes (2) comprising a tube body (21) arranged in a one-to-one correspondence in the reaction tube hole (13), a catalyst support frame (25) arranged in the tube body (21), a flange cover (24) arranged on the top of the tube body (21), and an air inlet pipe (241), a water inlet pipe (242) and an air outlet pipe (243) arranged on the flange cover (24); the tube body (21) is a straight tube inserted into the furnace chamber (12) and has a hemispherical end cap at the bottom, and the air outlet pipe (243) extends through the center of the flange cover (24) to a position close to the bottom of the reaction tube (2); the air inlet pipe (241) and the water inlet pipe (242) are symmetrically distributed on the flange cover (24) based on the air outlet pipe (243); A burner (3), the burner (3) comprising a flue gas pipe (31) arranged in the through hole (14), a gas pipe (32) arranged in the flue gas pipe (31), and an ignition electrode (33) arranged in the gas pipe (32); the flue gas pipe (31) extends into the furnace cavity (12), the bottom end of the flue gas pipe (31) is an open end and extends to a position close to the bottom end of the reaction tube (2), a plurality of smoke exhaust ports (311) are provided on the flue gas pipe (31) near the top surface of the furnace cavity (12), the top end of the flue gas pipe (31) extends from the top of the furnace body (1) to a predetermined height, and the ignition electrode (33) extends from the bottom end opening of the gas pipe (32).

2. The top-fired biogas reforming hydrogen production device according to claim 1, characterized in that: The top of the furnace body (1) is also covered with a furnace cover (17), and the furnace cover (17) is provided with a flue gas sleeve (18) arranged concentrically in a one-to-one correspondence with the reaction tube holes (13); the plurality of reaction tubes (2) are respectively and concentrically arranged in the flue gas sleeve (18) in a one-to-one correspondence.

3. The top-fired biogas reforming hydrogen production device according to claim 2, characterized in that: The top end of the tube body (21) is provided with a port flange (23), and the flange cover (24) is installed on the top end of the tube body (21) through the port flange (23); The pipe body (21) is provided with a positioning flange (22) at a predetermined position below the port flange (23), and the positioning flange (22) connects the pipe body (21) and the flue gas sleeve (18).

4. The top-fired biogas reforming hydrogen production device according to claim 3, characterized in that: After the positioning flange (22) is installed on the flue gas sleeve (18), the distance from the bottom end of the reaction tube (2) to the inner bottom surface of the furnace chamber (12) is 50 to 100 mm.

5. The top-fired biogas reforming hydrogen production device according to any one of claims 1 to 4, characterized in that: The furnace body (1) is provided with a temperature detection port (15), a pressure detection port (16) and a fire observation hole (19); the pressure detection port (16) is located between the through hole (14) and the reaction tube hole (13); the temperature detection port (15) and the fire observation hole (19) are arranged on the side wall of the furnace body (1) close to the furnace bottom.

6. The top-fired biogas reforming hydrogen production device according to any one of claims 1 to 4, characterized in that: The furnace wall (11) of the furnace body (1) comprises, from the outside to the inside, a metal protective shell, a heat-insulating layer and a refractory layer.

7. The top-fired biogas reforming hydrogen production device according to any one of claims 1 to 4, characterized in that: The catalyst support frame (25) comprises a metal mesh tube concentrically arranged in the tube body (21) and a plurality of brackets (251) distributed on the metal mesh tube at intervals along the axial direction, and the bracket (251) comprises a support ring (2511) connected to the metal mesh tube and a limit rod (2512) one end of which is connected to the support ring (2511) and the other end of which extends to the inner surface of the reaction tube (2).

8. The top-fired biogas reforming hydrogen production device according to any one of claims 1 to 4, characterized in that: The distance between the bottom end of the smoke pipe (31) and the inner bottom surface of the furnace chamber (12) is 150 to 200 mm; The distance from the smoke exhaust port (311) to the top surface of the furnace cavity (12) is 0 to 50 mm.

9. The top-fired biogas reforming hydrogen production device according to any one of claims 2 to 4, characterized in that: The upper end of the smoke pipe (31) is also provided with a plurality of converging smoke pipes (312) connected to the smoke sleeve (18); The smoke pipe (31) is also provided with a smoke outlet (313) near the top, and the smoke outlet (313) is vertically connected to the smoke pipe (31).

10. The top-fired biogas reforming hydrogen production device according to claim 9, characterized in that: The bottom end of the gas pipe (32) extends 10 to 30 mm below the smoke exhaust port (311); the top end of the gas pipe (32) is provided with a first fuel gas inlet (321), a second fuel gas inlet (322) and an air inlet (323); the first fuel gas inlet (321), the second fuel gas inlet (322) and the air inlet (323) are respectively vertically connected to the gas pipe (32).

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