Stable-operation electromagnetic heating device and manufacturing method thereof

Abstract

The invention relates to the technical field of pyrolysis and carbonization, and particularly discloses a stable-operation electromagnetic heating device which comprises a pyrolysis reaction cylinder and a heating unit, and the pyrolysis reaction cylinder is used for containing external biomass raw materials; the heating unit comprises a heat conduction fin arranged on the outer wall of the pyrolytic reaction cylinder, a heat insulation layer arranged on the outer side of the heat conduction fin, an electromagnetic induction coil wound on the outer wall of the heat insulation layer and a power supply module for supplying power to the electromagnetic induction coil; the system further comprises a first feeding unit, a raw material feeding port is formed in one end of the pyrolytic reaction cylinder, a residue discharging port is formed in the other end of the pyrolytic reaction cylinder, and the first feeding unit is used for conveying external biomass raw materials to the residue discharging port through the raw material feeding port. And under a high-temperature condition, the conductivity of traditional equipment is easily increased due to internal biomass graphitization, and then a barrel material is damaged. The heat-conducting fins and the outer jacket structure are far away from a high-temperature area, so that effective utilization of heat is ensured, and the barrel structure is not affected.

Description

Technical Field

[0001] The invention relates to the technical field of pyrolysis carbonization, and in particular discloses a stably operating electromagnetic heating device and a manufacturing method thereof. Background Art

[0002] Pyrolysis technology can quickly and efficiently convert biomass into industrial fuel and high value-added products with the advantages of low cost and easy operation. It is considered to be one of the most efficient and promising biomass thermal conversion methods. However, most of the current biomass pyrolysis technologies are restricted from large-scale industrial applications because the proportion of residual volatile matter in biochar affects the economic value of utilization. At the same time, the high tar content in the pyrolysis gas causes equipment and pipeline blockage, affecting the long-term stable operation of the equipment. Therefore, how to effectively reduce the proportion of volatile matter in biochar and reduce the tar content in pyrolysis gas is the key difficulty of biomass pyrolysis technology.

[0003] The structure of the traditional biomass electromagnetic heating reactor is a screw propulsion type. As described in CN221071396U "An electromagnetic instantaneous carbonization heating mechanism", the biomass raw material is transported in a stainless steel cylinder under the action of the first conveying blade. However, as the carbonization temperature (700℃~1100℃) increases, the size of the graphite crystals of the biochar begins to increase, and the conductivity increases from 10 -8 S / cm increases to 92.94S / cm, and the biomass changes from an insulator to a good conductor and begins to heat itself under the magnetic field of the electromagnetic coil. Since the melting point of graphite is 3850℃, which is much higher than the melting point of stainless steel 1450℃, the stainless steel cylinder is easily burned through under the continuous high-temperature heating of graphite, causing the equipment to fail to operate. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a stably operating electromagnetic heating device and a manufacturing method thereof, which can not only achieve the advantages of electromagnetic induction heating, but also effectively avoid the adverse effects of high-temperature pyrolysis and carbonization of biomass on the equipment after graphitization begins, so that the equipment can operate stably for a long time.

[0005] To achieve the above-mentioned purpose, the present invention provides a stably operating electromagnetic heating device, comprising a pyrolysis reaction barrel and a heating unit, wherein the pyrolysis reaction barrel is used to accommodate external biomass raw materials, and the heating unit comprises heat-conducting fins arranged on the outer wall of the pyrolysis reaction barrel, a heat-insulating layer arranged on the outside of the heat-conducting fins, an electromagnetic induction coil wound around the outer wall of the heat-insulating layer, and a power module for supplying power to the electromagnetic induction coil; and also comprises a first feeding unit, wherein one end of the pyrolysis reaction barrel is provided with a raw material feed port, and the other end of the pyrolysis reaction barrel is provided with a residue discharge port, and the first feeding unit is used to transport the external biomass raw materials to the residue discharge port via the raw material feed port.

[0006] Furthermore, the heating unit also includes an outer jacket arranged between the heat-conducting fins and the heat-insulating layer, and the outer jacket is used to conduct the heat generated by the electromagnetic induction coil to the heat-conducting fins.

[0007] Furthermore, the electromagnetic heating device also includes two heat preservation units used in conjunction with the heating unit. The two heat preservation units are arranged around the outer wall of the pyrolysis reaction cylinder and are respectively located at both ends of the heating unit to reduce heat loss at both ends of the cylinder.

[0008] Furthermore, the heat-conducting fins are extended along the axial direction of the pyrolysis reaction tube, and there are multiple heat-conducting fins, which are arranged around the central axis of the pyrolysis reaction tube.

[0009] Furthermore, the first feeding unit includes a first mounting shaft rotatably arranged inside the pyrolysis reaction tube, a first conveying blade spirally arranged around the first mounting shaft, and a first driving member connected to the first mounting shaft.

[0010] Furthermore, the first conveying blade is provided with a notch for facilitating the discharge of gas generated by pyrolysis of the biomass raw material in the pyrolysis reaction tube.

[0011] Furthermore, the electromagnetic heating device also includes a cooling and discharging unit used in conjunction with the pyrolysis reaction cylinder, the cooling and discharging unit includes a cooling cylinder connected to the residue discharge port, a second feeding unit arranged in the cooling cylinder, and a cooling tower used in conjunction with the cooling cylinder, the second feeding unit is used to transport the residue generated after the pyrolysis of the biomass raw material to the next process via the cooling cylinder, and the cooling tower is used to reduce the temperature of the residue generated after the pyrolysis of the biomass raw material in the cooling cylinder.

[0012] Furthermore, the second feeding unit includes a second mounting shaft rotatably disposed in the cooling cylinder, a second conveying blade spirally disposed around the second mounting shaft, and a second driving member connected to the second mounting shaft.

[0013] Furthermore, the cooling cylinder has a residue feed hopper connected to the residue discharge port, the residue feed hopper is connected to the interior of the cooling cylinder, and a cooling discharge port is provided at one end of the cooling cylinder away from the residue feed hopper, and the cooling discharge port is connected to an external residue recovery device.

[0014] Furthermore, the cooling tower includes a chassis, which is made of high temperature resistant and corrosion resistant alloy material to ensure long-term stable operation in a high temperature environment, and also includes a coolant circulation pipe, an air circulation pipe, a circulation pump, an air inlet, and an air inlet fan. The coolant circulation pipe is continuously circulated by the circulation pump to ensure that the heat exchange process continues; one end of the air circulation pipe is connected to the chassis, and the other end is connected to the top of the cooling cylinder and connected to the cooling cylinder.

[0015] Furthermore, the electromagnetic heating device also includes a temperature measuring unit, which includes a barrel thermocouple and a jacket thermocouple. The barrel thermocouple is arranged on the outer wall of the pyrolysis reaction barrel to detect the surface temperature of the outer wall of the pyrolysis reaction barrel, and the jacket thermocouple is arranged on the outer wall of the outer jacket to detect the surface temperature of the outer wall of the outer jacket.

[0016] Furthermore, the thickness of the heat-conducting fins is 1-3 mm, and the height of the heat-conducting fins is 150-200 mm.

[0017] Furthermore, the outer wall of the pyrolysis reaction cylinder and the outer wall of the outer jacket are both provided with thermocouple mounting joints, and the hot junctions of the cylinder thermocouple and the jacket thermocouple are respectively mounted on the two thermocouple mounting joints.

[0018] Furthermore, the heat-conducting fins are provided in a plurality of groups, and the plurality of groups of heat-conducting fins are arranged at intervals along the length direction of the pyrolysis reaction tube.

[0019] A method for manufacturing a stably operating electromagnetic heating device comprises the following steps:

[0020] S1. Installing heat-conducting fins. Installing multiple groups of heat-conducting fins on the outer wall of the pyrolysis reaction tube. The multiple groups of heat-conducting fins (21) are arranged in a ring array around the pyrolysis reaction tube (1). The heat-conducting fins (21) are extended along the axial direction of the pyrolysis reaction tube (1). The number of the heat-conducting fins is positively correlated with the outer diameter of the pyrolysis reaction tube and the length of the pyrolysis reaction tube. The height of the heat-conducting fins is positively correlated with the electromagnetic induction distance of graphite generated after pyrolysis and carbonization of the biomass raw material. The extension direction of the heat-conducting fins is perpendicular to the axial direction of the pyrolysis reaction tube.

[0021] S2, installing an outer jacket, welding an outer jacket on the outer sides of the multiple groups of heat-conducting fins in step S1, wherein the outer jacket is formed by sequentially welding a plurality of metal rings or by adopting a metal integral molding process;

[0022] S3, installing a heat insulation layer, and sleeve a cylindrical heat insulation layer on the outer side of the outer jacket in step S2;

[0023] S4, installing a heat preservation unit, installing two heat preservation units at both ends of the outer jacket in the axial direction, the heat preservation units are arranged in a ring shape and are arranged perpendicularly to the extension direction of the heat conducting fins, and the thickness of the heat preservation unit in the radial direction is greater than or equal to the height of the heat conducting fins;

[0024] S5. Install thermocouples. Install thermocouple mounting joints on the outer walls of the pyrolysis reaction tube and the outer jacket respectively. Install the tube thermocouple and the jacket thermocouple on the two thermocouple mounting joints respectively, so that the hot junction of the tube thermocouple contacts the outer wall of the pyrolysis reaction tube, and the hot junction of the jacket thermocouple contacts the outer wall of the outer jacket.

[0025] Furthermore, the thickness of the heat-conducting fins in step S1 is 0.5-5 mm.

[0026] Furthermore, the heat insulating layer comprises an inner layer made of aluminum silicate fiber and an outer layer made of aerogel, the inner layer abuts against the outer jacket, and the outer wall of the outer layer is used for winding the electromagnetic induction coil.

[0027] Furthermore, the thickness of the thermal insulation layer is 15-55 mm.

[0028] The biomass electromagnetic heating high-temperature pyrolysis carbonization device provided by the present invention realizes an efficient and stable pyrolysis process through a series of innovative structures. The core components include an inner cylinder, an outer jacket, fins, an electromagnetic induction coil and thermal insulation materials. The electromagnetic induction coil is installed around the outer jacket and isolated by a thermal insulation layer, which effectively transfers heat energy to the fins and the inner cylinder, and further transfers heat to the internal biomass raw materials. The design of the fins optimizes the heat conduction efficiency and ensures that the biomass in the inner cylinder is evenly heated. The thermal insulation material between the outer jacket and the inner cylinder reduces heat energy loss and improves the overall thermal efficiency. In addition, the device monitors the temperature in real time through a thermocouple to ensure safe operation.

[0029] Beneficial effects of the present invention: Compared with the traditional biomass electromagnetic heating reactor, the main advantage of the present invention is that it improves the pyrolysis efficiency and equipment stability. Under high temperature conditions, traditional equipment is prone to increase in conductivity due to internal biomass graphitization, which subsequently causes damage to the barrel material. The present invention uses heat-conducting fins and an outer jacket structure away from the high-temperature area to ensure effective use of heat without affecting the barrel structure. This design avoids the problem of self-heating of biomass during the pyrolysis process, reduces the risk of equipment damage caused by excessive temperature, and thus achieves long-term stable operation of the equipment. This is particularly important for the industrial application of biomass energy conversion equipment, which helps to reduce maintenance costs and improve production efficiency.

[0030] Through the above design and operation mechanism, the present invention not only improves the energy efficiency of the pyrolysis process, but also protects the equipment from damage by high-temperature graphitized biomass, ensuring long-term stable operation. These characteristics make the equipment have high practical value and promotion potential in the field of biomass energy conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the electromagnetic heating device of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of the electromagnetic heating device of the present invention after partial section;

[0033] Figure 3 It is a structural schematic diagram of the second feeding unit of the present invention;

[0034] Figure 4 It is a schematic structural diagram of a cross section of the electromagnetic heating device of the present invention.

[0035] Reference numerals include:

[0036] 1. Pyrolysis reaction cylinder; 2. Heating unit; 3. First feeding unit; 4. Insulation unit; 5. Cooling and discharging unit; 6. Temperature measuring unit; 7. Cooling tower; 11. Raw material feeding port; 12. Residue discharging port; 21. Heat-conducting fins; 22. Outer jacket; 23. Heat-insulating layer; 24. Electromagnetic induction coil; 31. First mounting shaft; 32. First conveying blade; 33. First driving member; 51. Cooling cylinder; 511. Residue feeding hopper; 52. Second feeding unit; 521. Second mounting shaft; 522. Second conveying blade; 523. Second driving member; 60. Thermocouple mounting joint; 61. Cylinder thermocouple; 62. Jacket thermocouple; 71. Chassis; 72. Air inlet fan; 73. Air inlet; 74. Circulating pump; 75. Coolant circulation pipe; 76. Air circulation duct. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0038] See also Figures 1 to 4 As shown, a stably operating electromagnetic heating device of the present invention comprises a pyrolysis reaction barrel 1, a heating unit 2, a first feeding unit 3, a cooling and discharging unit 5 and a temperature measuring unit 6. The pyrolysis reaction barrel 1 is designed to be a long cylinder, with a raw material feed port 11 at one end and a residue discharge port 12 at the other end. The heating unit 2 comprises a plurality of groups of heat-conducting fins 21, which are arranged at intervals along the axial direction of the pyrolysis reaction barrel 1 and surround the central axis of the pyrolysis reaction barrel 1. The longitudinal section of the heat-conducting fin 21 is rectangular and the cross section is annular. An outer jacket 22 made of metal is installed between the heat-conducting fin 21 and the outer wall of the pyrolysis reaction barrel 1, and a heat-insulating layer 23 is provided on the outer jacket of the outer jacket 22, which comprises an inner layer made of aluminum silicate fiber and an outer layer made of aerogel. The outside of the heat-insulating layer 23 is surrounded by an electromagnetic induction coil 24.

[0039] In actual operation, when the power module is powered on, the electromagnetic induction coil 24 generates a high-frequency alternating electromagnetic field. The electromagnetic field acts on the outer jacket 22, increasing the eddy current on its surface and rapidly heating it up. The outer jacket 22 is made of metal material, has excellent thermal conductivity, and is the main heat transfer medium. After the electromagnetic induction coil 24 heats the outer jacket 22, the outer jacket 22 transfers the heat to the heat-conducting fins 21 close to its inner side through thermal radiation and heat conduction. The heat-conducting fins 21 have a rectangular longitudinal section and a ring cross section, and are evenly spaced and distributed on the outer wall of the pyrolysis reaction tube 1. This design can evenly distribute heat to the entire pyrolysis reaction tube 1 to avoid local overheating or uneven heating. The heat insulation layer 23 includes an inner layer made of aluminum silicate fiber and an outer layer made of aerogel, which is coated on the outer side of the outer jacket 22. On the one hand, this structure reduces the loss of heat to the external environment; on the other hand, the ultra-low thermal conductivity of the aerogel ensures that the electromagnetic induction coil 24 is not affected by the high temperature of the outer jacket 22, thereby extending the life of the equipment. The biomass raw material is fed into the inner cylinder through the feeding unit. When the inner cylinder is heated by the heat-conducting fins 21, its internal temperature gradually rises to the high temperature required for pyrolysis (usually 700°C-1100°C). The high temperature environment causes the biomass to undergo a rapid pyrolysis reaction, generating products such as biochar, pyrolysis gas and tar. In this embodiment, the first conveying blade 32 is notched, which helps to evenly stir the biomass raw material and allows the gas generated by pyrolysis to be discharged smoothly, thereby improving the reaction efficiency.

[0040] Specifically, the first feeding unit 3 realizes the continuous conveying of biomass raw materials through the first mounting shaft 31 and the first conveying blade 32, ensuring the continuous feeding of the pyrolysis reaction barrel 1. The cooling and discharging unit 5 includes a cooling barrel 51, a second feeding unit 52 and a cooling tower 7, which are used to treat the residue produced after pyrolysis and reduce its temperature. The temperature measuring unit 6 is composed of an inner barrel thermocouple 61 and an outer jacket 22 thermocouple. These thermocouples are installed on the wall of the pyrolysis reaction barrel 1 and the outer jacket 22 to monitor the temperature of the device in real time. When the temperature exceeds the preset range, the system will automatically alarm or stop heating to ensure the safe operation of the equipment.

[0041] Specifically, a notch (not shown in the figure) is formed on the first conveying blade 32, which can reduce the contact area between the blade and the material, so that the blade can have a certain space gap during the rotation process, allowing the biomass raw materials to flow and collide more freely, thereby enhancing the stirring effect of the material. The existence of the notch allows the blade to push the material forward more easily, while preventing the material from being bound between the first conveying blade 32 and the wall of the pyrolysis reaction tube 1 due to friction. In this way, the biomass can be more evenly distributed in the pyrolysis reaction tube 1 and fully contact with the heat, thereby accelerating the pyrolysis process.

[0042] During the pyrolysis reaction, biomass decomposes at high temperature to generate by-products such as pyrolysis gas (such as carbon monoxide, methane and other combustible gases) and liquid tar. If these gases are not discharged in time, it may affect the smooth progress of the pyrolysis reaction and even cause local overheating or tar accumulation. The notch opened on the first conveying blade 32 provides an exhaust channel for the gas generated by pyrolysis. These gases flow through the notch during the rotation of the first conveying blade 32, so as not to be trapped too much between the blade and the material. The design of the notch improves the gas emission efficiency, reduces the possibility of pyrolysis gas accumulation, and ensures that the gas can be smoothly discharged from the pyrolysis reaction cylinder 1.

[0043] The height and arrangement of the heat-conducting fins 21 make the distance between the biomass and the electromagnetic induction coil 24 exceed the electromagnetic induction distance of graphite. Even during the high-temperature pyrolysis process, the biomass is converted into a conductor due to graphitization and will not be further heated by the electromagnetic field, thereby effectively avoiding the problem of equipment burning due to high-temperature graphitization. The heat-insulating layer 23 greatly reduces heat loss and reduces heating energy consumption. In addition, the electromagnetic induction heating process does not require the use of fossil fuels, reduces carbon emissions, and is conducive to achieving environmental protection goals.

[0044] Specifically, the heat preservation unit 4 should be made of materials with high thermal insulation performance to ensure efficient heat retention. These materials are often high-density, low-thermal-conductivity materials that can effectively slow down heat transfer and ensure that the high-temperature environment of the electromagnetic induction coil 24 and the outer jacket 22 does not affect the operation of other components. In this embodiment, a combination of aluminum silicate fiber and rock wool is used, which is usually selected as a heat preservation material due to its excellent thermal insulation and high-temperature stability.

[0045] Compared with the heat insulation layer 23, the design focus of the heat preservation unit 4 is to increase the thickness and ensure the sealing along the two ends of the pyrolysis reaction tube 1. This thicker heat preservation unit 4 helps to prevent heat from being lost to the outside, reduce heat waste, and improve the overall heating efficiency. The cooperation between the heat conduction fins 21 of the heating unit 2 ensures that the heat will not leak out along the outer wall of the reaction tube, thereby providing a relatively stable high temperature environment and ensuring the high efficiency of biomass pyrolysis.

[0046] Specifically, the cooling tower 7 includes a chassis 71, which is made of a high temperature resistant and corrosion resistant alloy material to ensure that it can operate stably for a long time in a high temperature environment, and also includes a coolant circulation pipe 75, an air circulation pipe 76, a circulation pump 74, an air inlet 73, an air inlet fan 72 and an air outlet. The coolant circulation pipe 75 is continuously circulated by the circulation pump 74 to ensure that the heat exchange process continues; one end of the air circulation pipe 76 is connected to the chassis 71, and the other end is connected to the top of the cooling cylinder 51 and connected to the cooling cylinder 51.

[0047] The cooling tower 7 allows forced airflow to circulate in the chassis 71 through the cooperation of the air inlet fan 72 and the air outlet. The air inlet fan 72 draws outside air into the chassis 71. The coolant circulation pipe 75 is placed in the chassis 71 and filled with coolant. The circulating pump 74 is used to cool the air drawn by the air inlet fan 72 in the chassis 71. Finally, the cooled air is transported to the cooling cylinder 51 by the air circulation pipe 76 to cool the residue therein. The cooled residue is transported by the second feeding unit 52 and brought into the external residue recovery device, thus completing a working cycle. The air flow system and coolant circulation system of the cooling tower 7 provide cooling support for the entire pyrolysis device, avoid overheating of the equipment, and improve the working efficiency and service life of the device.

[0048] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A stably operated electromagnetic heating device, characterized in that: The invention comprises a pyrolysis reaction barrel (1) and a heating unit (2), wherein the pyrolysis reaction barrel (1) is used to accommodate external biomass raw materials, and the heating unit (2) comprises a heat-conducting fin (21) arranged on the outer wall of the pyrolysis reaction barrel (1), a heat-insulating layer (23) arranged outside the heat-conducting fin (21), an electromagnetic induction coil (24) wound around the outer wall of the heat-insulating layer (23), and a power supply module for supplying power to the electromagnetic induction coil (24); and further comprises a first feeding unit (3), wherein one end of the pyrolysis reaction barrel (1) is provided with a raw material feed port (11), and the other end of the pyrolysis reaction barrel (1) is provided with a residue discharge port (12), and the first feeding unit (3) is used to transport the external biomass raw materials to the residue discharge port (12) via the raw material feed port (11).

2. The electromagnetic heating device with stable operation according to claim 1 is characterized in that: The heating unit (2) further comprises an outer jacket (22) arranged between the heat-conducting fins (21) and the heat-insulating layer (23), wherein the outer jacket (22) is used to conduct heat generated by the electromagnetic induction coil (24) to the heat-conducting fins (21).

3. The electromagnetic heating device with stable operation according to claim 1 is characterized in that: The electromagnetic heating device further comprises two heat-insulating units (4) used in conjunction with the heating unit (2); the two heat-insulating units (4) are arranged around the outer wall of the pyrolysis reaction cylinder (1) and are respectively located at two ends of the heating unit (2), so as to reduce heat loss at the two ends of the cylinder.

4. The electromagnetic heating device with stable operation according to claim 1 is characterized in that: The heat-conducting fins (21) are arranged to extend along the axial direction of the pyrolysis reaction cylinder (1); there are a plurality of heat-conducting fins (21), and the plurality of heat-conducting fins (21) are arranged around the central axis of the pyrolysis reaction cylinder (1).

5. The electromagnetic heating device with stable operation according to claim 1, characterized in that: The first feeding unit (3) comprises a first mounting shaft (31) rotatably arranged inside the pyrolysis reaction barrel (1), a first conveying blade (32) spirally arranged around the first mounting shaft (31), and a first driving member (33) connected to the first mounting shaft (31); the first conveying blade (32) is provided with a notch for facilitating the discharge of gas generated by pyrolysis of biomass raw materials in the pyrolysis reaction barrel (1).

6. The electromagnetic heating device with stable operation according to claim 1, characterized in that: The electromagnetic heating device also includes a cooling and discharging unit (5) used in conjunction with the pyrolysis reaction cylinder (1), the cooling and discharging unit (5) including a cooling cylinder (51) connected to the residue discharge port (12), a second feeding unit (52) rotatably arranged in the cooling cylinder (51), and a cooling tower (7) used in conjunction with the cooling cylinder (51), the second feeding unit (52) being used to transport the residue generated after the pyrolysis of the biomass raw material to the next process via the cooling cylinder (51), and the cooling tower (7) being used to reduce the temperature of the residue generated after the pyrolysis of the biomass raw material in the cooling cylinder (51).

7. The electromagnetic heating device with stable operation according to claim 1 is characterized in that: The electromagnetic heating device further comprises a temperature measuring unit (6), wherein the temperature measuring unit (6) comprises a barrel thermocouple (61) and a jacket thermocouple (62), wherein the barrel thermocouple (61) is arranged on the outer wall of the pyrolysis reaction barrel (1) for detecting the surface temperature of the outer wall of the pyrolysis reaction barrel (1), and the jacket thermocouple (62) is arranged on the outer wall of the outer jacket (22) for detecting the surface temperature of the outer wall of the outer jacket (22).

8. The electromagnetic heating device with stable operation according to claim 1, characterized in that: The thickness of the heat-conducting fin (21) is 1-3 mm, and the height of the heat-conducting fin (2) is 150-200 mm.

9. A method for manufacturing a stable electromagnetic heating device, comprising the following steps: S1. Installing heat-conducting fins (21). Installing a plurality of groups of heat-conducting fins (21) on the outer wall of the pyrolysis reaction tube (1). The plurality of groups of heat-conducting fins (21) are arranged in a ring array around the pyrolysis reaction tube (1). The heat-conducting fins (21) are extended along the axial direction of the pyrolysis reaction tube (1). S2, installing an outer jacket (22), welding the outer jacket (22) on the outer sides of the multiple groups of heat-conducting fins (21) in step S1, wherein the outer jacket (22) is formed by welding a plurality of metal rings in sequence or by adopting a metal sheet integral winding molding process; S3, installing a heat insulation layer (23), wherein a cylindrical heat insulation layer (23) is sleeved on the outer side of the outer jacket (22) in step S2; S4, installing a heat-insulating unit (4), wherein two heat-insulating units (4) are installed at both ends of the outer jacket (22) in the axial direction, the heat-insulating units (4) are arranged in an annular shape and are arranged perpendicularly relative to the extension direction of the heat-conducting fins (21), and the thickness of the heat-insulating unit (4) in the radial direction is greater than or equal to the height of the heat-conducting fins (21); S5. Install thermocouples. Install thermocouple mounting joints (60) on the pyrolysis reaction barrel (1) and the outer jacket (22), respectively. Install the barrel thermocouple (61) and the jacket thermocouple (62) on the two thermocouple mounting joints (60), respectively. Use the barrel thermocouple (61) to detect the temperature value of the pyrolysis reaction barrel (1), and use the jacket thermocouple (62) to detect the temperature value of the outer jacket (22).

10. The method for manufacturing a stably operating electromagnetic heating device according to claim 9, characterized in that: The heat insulating layer (23) comprises an inner layer made of aluminum silicate fibers and an outer layer made of aerogel, the inner layer abuts against the outer jacket (22), and the outer wall of the outer layer is used for winding an electromagnetic induction coil (24).

Images