Hydrogenation reactor bevel joint heat treatment device

Abstract

The application discloses a kind of for hydrogenation reactor bevel pipe heat treatment device, the hydrogenation reactor includes cylinder, the bevel pipe is connected to the cylinder, the device includes: cable placer, is arranged around the bevel pipe, for arranging cable;Cable, is movably arranged on the cable placer;Heat insulation layer, is laid between the hydrogenation reactor and the cable placer;Electric cable take-up machine, is connected to the cable, for tightening or releasing the cable.The design and calculation method of inductive heating power supply and inductor includes the design and calculation of inductive heating power supply parameters, inductive cable turns and the arrangement cable method according to the heating process and size condition of bevel pipe and cylinder.The design and calculation of inductive heating power supply and inductor, accurate arrangement power supply and inductive device, avoid the problem that traditional direct laying inductive cable needs repeated operation, improve work efficiency, and simultaneously can realize the sensitive regulation and control of inductive heating temperature.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically to a heat treatment apparatus for a inclined pipe of a hydrogenation reactor. Background Technology

[0002] Currently, flame or resistance heating is commonly used for preheating and post-heating in the production of thick-walled pressure vessels. Flame heating is costly, operates in a harsh environment, has low energy efficiency, and is difficult to control in terms of temperature uniformity; resistance heating is slow, temperature is difficult to control, has high maintenance costs, and is unsuitable for thick-walled equipment. Using 45℃ for the catalyst discharge pipe is beneficial for loading and unloading catalysts in hydrogenation reactors. However, due to the high-temperature, high-pressure, hydrogen-contaminated environment of hydrogenation reactors, materials such as hydrogen-resistant chromium-molybdenum steel (e.g., 2.25Cr-1Mo, 2.25Cr-1Mo-1 / 4V) are selected, requiring extremely high welding standards. Preheating at high temperatures is mandatory before welding, and post-heating is necessary before the final post-weld heat treatment. Due to the irregular shape, maintaining consistent temperature uniformity during preheating and post-heating using existing technologies is difficult.

[0003] Therefore, a high-efficiency, low-cost, and temperature-controllable heating process is urgently needed for the preheating and post-weld heat treatment of large, thick-walled cylindrical vessels. The performance and lifespan of mechanical products are inseparable from their heat treatment processes. Induction heating, as a novel welding heat treatment process, has the advantages of flexible process, fast heating speed, easy temperature control, and the ability to replace overall heating with local heating. Moreover, it is easy to automate, environmentally friendly, energy efficient, and has low production costs. As a result, it is gradually being promoted and applied in the preheating and post-weld heat treatment of large, thick-walled cylindrical pressure vessels.

[0004] Electromagnetic induction heating works by passing an alternating current of a certain frequency through an induction coil, generating an alternating magnetic field around the coil and the workpiece. This alternating magnetic field induces eddy currents within the workpiece through electromagnetic induction. These eddy currents then generate heat in the metal. Because the workpiece itself generates heat directly, heat loss is greatly reduced, improving energy utilization efficiency.

[0005] Based on the above characteristics, electromagnetic induction heating is used for preheating and post-weld heating of inclined pipes in hydrogenation reactors, such as discharge pipes. For large, thick-walled cylinders, due to the simple structure, electromagnetic induction heating involves directly laying induction cables and winding induction coils on-site. The heating cables are laid directly to the outside of the weld seam, and the heating is removed after reaching the set temperature for welding. The disadvantage is that heating only the outside causes uneven temperature along the wall thickness. After removing the induction heating, the workpiece temperature drops rapidly, requiring welding to be stopped and reheated when it falls below the required process temperature. This repeated operation is labor-intensive, time-consuming, and affects work efficiency. Furthermore, for special structures such as discharge pipes in hydrogenation reactors, the wall thickness differs significantly from the cylinder itself. Different wall thicknesses result in different heat transfer conditions, leading to anisotropy in deformation and stress at the pipe joint. During induction heating, the winding cables are typically connected in parallel with one or two cables, failing to consider the differences in heat treatment requirements for pipes with different wall thicknesses. This leads to gradually increasing temperature differences, resulting in inflexible heating control, residual stress, structural distortion, and negatively impacting the heat treatment effect.

[0006] Therefore, there is a need for a heating device that offers flexible heating control and is less likely to cause structural distortion. Summary of the Invention

[0007] The technical problem this invention aims to solve is to address the shortcomings of existing technologies by proposing an induction heating device for welding inclined pipes in hydrogenation reactors. The technical solution of this invention solves the problems of repeated, time-consuming, and labor-intensive operations that are required when directly laying induction cables for heating, thus reducing work efficiency, and achieves flexible installation of induction cables for complex pipe connections.

[0008] To achieve the above objectives, the present invention provides a heat treatment apparatus for an inclined pipe of a hydrogenation reactor, wherein the hydrogenation reactor includes a cylindrical body, and the inclined pipe is connected to the cylindrical body; the apparatus includes:

[0009] A cable arranger, positioned around the inclined pipe, is used for arranging cables;

[0010] The cable is movably mounted on the cable arranger;

[0011] An insulation layer is laid between the hydrogenation reactor and the cable arrangement device;

[0012] An electric cable reel, connected to the cable, is used to tighten or release the cable.

[0013] The effects of this invention are:

[0014] (1) The cable arranger proposed in this invention can be flexibly set on the inner and outer walls of the inclined pipe of the hydrogenation reactor. The cable can be movably set on the cable arranger to facilitate the adjustment of the cable spacing, avoiding the problem of repeated operation required by traditional direct laying of induction cables, thus improving work efficiency. At the same time, the cable arranger can be moved more conveniently inside and outside the inclined pipe of the hydrogenation reactor by cooperating with the electric cable take-up machine to tighten or release the cable.

[0015] (2) The first cable bearing plate and the second cable bearing plate, which are hinged by a rotating shaft, are more convenient to cooperate with the cylinder and pipe of the inclined pipe. The groove on the cable bearing plate cooperates with the cable support slider to make the cable movement more convenient and flexible.

[0016] (3) The thermocouples uniformly arranged in the cylinder and inclined tube of the present invention can accurately measure the temperature difference between the inner and outer walls of the cylinder and inclined tube, and flexibly adjust the power of the heating power supply according to the temperature difference.

[0017] (4) Based on the different heat treatment conditions of each part of the inclined pipe, this invention proposes to design and calculate the rated power of the induction heating power supply and the length of the induction cable for the cylinder and the inclined pipe, and to accurately arrange the induction power supply and induction device.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0020] Figure 1 This is a schematic diagram of the cable arrangement at the inclined pipe of the hydrogenation reactor of the present invention.

[0021] Figure 2 This is a schematic diagram of the electromagnetic induction operation of the inclined pipe heating device for the hydrogenation reactor of the present invention.

[0022] Figure 3 This is a partial schematic diagram of the cable support plate of the inclined pipe heating device for the hydrogenation reactor of the present invention.

[0023] Figure 4 This is a partial schematic diagram of the variable-pitch cable bearing plate of the inclined pipe heating device for the hydrogenation reactor of the present invention.

[0024] Figure 5 This is a schematic diagram of the cross-section of the cable support plate of the inclined pipe heating device for the hydrogenation reactor of the present invention.

[0025] Figure 6 This is the non-working cable retracted state of the inclined pipe heating device of the hydrogenation reactor of the present invention.

[0026] Figure 7 This is a temperature rise diagram of the induction heating process of the inclined pipe heating device for the hydrogenation reactor of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-First power source, 2-Second power source, 3-Cylinder body, 4-First cable, 5-Cable carrier plate, 6-Angled pipe, 7-Rotating shaft, 8-Electric cable winding machine, 9-Outer connector, 10-Inner connector, 11-Lower connector, 12-Upper connector, 13-Second cable;

[0029] 101-Cable carrier plate, 102-Slide rail, 103-Arc groove, 104-Cable, 106-Cable support slider, 107-Slide groove. Detailed Implementation

[0030] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0031] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its normal operating state, for example, as shown in the reference. Figure 1 In the drawing orientation, "inner" and "outer" refer to their relative to the outline of the device. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] This invention provides a heat treatment apparatus for the inclined pipe of a hydrogenation reactor, such as... Figure 1 As shown, the hydrogenation reactor includes a cylindrical body 3, with an inclined pipe 6 connected to the cylindrical body 3. The heat treatment device includes:

[0033] A cable arranger, located around the diagonal connector 6, is used for cable arrangement;

[0034] The cable is movably mounted on the cable tray;

[0035] An insulation layer is laid between the hydrogenation reactor and the cable tray;

[0036] Electric cable retractor 8, connected to the cable, is used to tighten or release the cable.

[0037] According to the present invention, the cable arranger includes a plurality of cable bearing plates 5, one side surface of the cable bearing plate 5 is provided with a slide rail 102, and a plurality of cable support sliders 106 are provided on the slide rail 102; one end of the cable support slider 106 is provided with a groove 107 that cooperates with the slide rail 102 so as to slide on the slide rail 102, and the other end is provided with an arc-shaped groove for supporting the cable.

[0038] The plurality of cable carrier plates 5 include a plurality of first cable carrier plates arranged radially along the inner wall or outer wall of the cylinder 3 and a plurality of second cable carrier plates arranged axially along the inner wall or outer wall of the inclined pipe 6, wherein each first cable carrier plate is rotatably connected to a second cable carrier plate.

[0039] Preferably, the slide rail 102 is I-shaped. The direction in which the cable support slider 106 slides on the slide rail 102 is perpendicular to the axis of the arc-shaped groove.

[0040] Each first cable carrier plate is hinged to a second cable carrier plate via a rotating shaft 7.

[0041] According to the present invention, the cable includes a first cable 4 and a second cable 13.

[0042] The first cable 4 is installed in the arc-shaped groove of the first cable bearing plate, forming a spiral shape from the inside to the outside. The two ends of the first cable 4 are respectively provided with an inner connector 10 and an outer connector 9.

[0043] The second cable 13 is installed in the arc-shaped groove of the second cable bearing plate, forming a spiral shape from top to bottom. The two ends of the second cable 13 are respectively provided with an upper connector 12 and a lower connector 11.

[0044] Preferably, the inner connector 10 and the outer connector 9 are connected to the first power supply 1. The upper connector 12 and the lower connector 11 are connected to the second power supply 2.

[0045] According to the present invention, the inner connector 10 is connected to the lower connector 11.

[0046] External connector 9 and upper connector 12 are connected to the power supply respectively.

[0047] According to the present invention, the device also includes a controller and a plurality of thermocouples.

[0048] The multiple thermocouples include multiple first thermocouples uniformly arranged radially along the inclined tube 6 and multiple second thermocouples uniformly arranged axially along the inclined tube 6.

[0049] Multiple first thermocouples are used to measure the temperature difference between the inner and outer walls of the cylinder 3, and multiple second thermocouples are used to measure the temperature difference between the inner and outer walls of the inclined tube 6. The controller adjusts the power of the first power supply 1 and / or the second power supply 2 according to the temperature difference.

[0050] According to the present invention, the inner connector 10 is connected to the lower connector 11;

[0051] The electric cable reel 8 is connected to the upper connector 12. Starting the electric cable reel 8 tightens or releases the cable.

[0052] In this invention, the inner seam refers to the interface between the cylinder 3 and the inclined pipe 6 on the outside of the inclined pipe of the heating hydrogenation reactor, and the outer seam refers to the interface between the cylinder 3 and the inclined pipe 6 on the inside of the inclined pipe.

[0053] To weld the outer seam, in order to facilitate the smooth entry of the cable arranger into the heating and hydrogenation reactor, first disconnect the cable connector from the power supply, connect the inner connector 10 to the lower connector 11, connect the electric cable retractor 8 to the upper connector 12, then start the electric cable retractor 8 to tighten the cable, and finally put the cable arranger, which has been shrunk into a bundle, into the heating and hydrogenation reactor.

[0054] In this invention, the cable can be tightened by an electric cable retractor 8 during non-working periods, making it ideal for flexibly transferring the cable arrangement device inside and outside the heating and hydrogenation reactor. The technical solution of this invention solves the problem of repeated, time-consuming, and labor-intensive operations that are required when directly laying induction cables for heating, thus affecting work efficiency.

[0055] In this invention, the movement of the slide 107 makes it easier to adjust the cable turn spacing.

[0056] In actual operation, the technical solution of the present invention monitors the temperature difference between the inner and outer walls of the hydrogenation reactor in real time through uniformly distributed thermocouples, and adjusts the output power of the first power supply 1 and / or the second power supply 2 according to the temperature difference between the inner and outer walls through the controller.

[0057] In this invention, when the temperature difference between the inner and outer walls of the hydrogenation reactor monitored by the thermocouple is within the threshold, the power output is increased or the two cables are connected in series to the same power source to heat the cylinder 3 and the inclined pipe 6 of the hydrogenation reactor. When the temperature difference between the radial side of the cylinder 3 and the axial side of the inclined pipe 6 of the hydrogenation reactor is not uniform as measured by the thermocouple, the position of the cable support slider 106 on the slide rail 102 is adjusted to change the spacing between the first and second cable turns, thereby controlling the radial and axial heating speeds to achieve uniform temperature change.

[0058] According to the present invention, the rated power of the first power supply 1 and the second power supply 2 is calculated according to the following formula:

[0059]

[0060] The induced current flowing through the first cable 4 and the second cable 13 is calculated using the following formula:

[0061]

[0062] The number of turns of the first cable 4 and the second cable 13 is calculated using the following formula:

[0063]

[0064] Wherein, P is the rated power of the first power source 1 or the second power source 2, C is the average specific heat capacity of the steel, T1 is the initial temperature of the steel, T2 is the heating temperature of the steel, η is the total efficiency of the heating system, ρ is the density of the steel, δ is the penetration depth, R is the outer diameter of the cylinder 3 or the inclined pipe 6, L1 is the length of the heating base material, t is the through-heating time, I is the induced current flowing through the first cable 4 or the second cable 13, r is the resistance of the base material, and Z is the total impedance of the load system.

[0065] In this invention, the coefficient k takes the value of 0.90-0.95.

[0066] According to the present invention, when the second cable bearing plate is placed on the inner wall of the inclined pipe 6, the length of the second cable 13 is calculated according to the following formula:

[0067] L1′=(πd+a-2δπ)n1

[0068] When the second cable bearing plate is placed on the outer wall of the inclined pipe 6, the length of the second cable 13 is calculated according to the following formula:

[0069] L1=(πd+a)n1

[0070] When the first cable bearing plate is placed on the inner or outer wall of the cylinder 3, the length of the first cable 4 is calculated according to the following formula:

[0071]

[0072] Where L1' and L1 are the lengths of the second cable 13, d is the diameter of the oblique connector 6, a is the turn spacing of the second cable 13, n1 is the number of turns of the second cable 13, δ is the wall thickness of the oblique connector 6, L2 is the length of the first cable 4, m is the turn spacing of the first cable 4, and n2 is the number of turns of the first cable 4.

[0073] In this invention, the derivation process of the formula for calculating the number of turns of the induction cable is as follows:

[0074] (i) Calculate the power capacity at pipe 6 and cylinder 3 based on the heat treatment temperature:

[0075]

[0076] Where P is the power of the induction heating power supply, G is the mass of the heat-treated steel, C is the average specific heat capacity of the steel, T1 is the initial temperature of the steel, T2 is the heating temperature of the steel, and η is the overall efficiency of the induction heating system.

[0077] (ii) Calculation of mass G:

[0078]

[0079]

[0080] Where δ is the penetration depth, R is the outer diameter of cylinder 3 or nozzle 6, L1 is the length of the heating base material, and t is the heating time (estimated empirical value using material properties and process parameters).

[0081] Substituting G from formula C into formula A in (i), we get P as:

[0082]

[0083] (iii) Calculation of the number of turns of the induction coil:

[0084]

[0085] U1 = ZI (F)

[0086]

[0087]

[0088] Substituting U0 and U1 into formula E, we get N as:

[0089]

[0090] Finally, substituting P, I, and Z into formula I yields the number of turns N.

[0091] Wherein, U0 is the terminal voltage of the induction coil, U1 is the inter-turn voltage of the induction coil, Z is the total impedance of the load system (estimated empirical value using material properties and process parameters), I is the induced current flowing through the coil, r is the resistance of the base material, and the coefficient k is 0.90-0.95.

[0092] In this invention, the cable is determined according to P. Generally, a cross-sectional area of ​​120mm² is used for 40-80KW applications. 2 The induction cable. The 160KW version uses two 120mm² cross-sectional area cables. 2 The induction cables are connected in parallel, and so on.

[0093] The present invention will now be described in more detail through a specific embodiment.

[0094] Example 1

[0095] This embodiment is an example of heat treatment at the connection between the inclined pipe 6 and the cylinder 3 of a hydrogenation reactor.

[0096] The cylinder 3 of a hydrogenation reactor has a diameter of 2900 mm and a thickness of 220 mm, and is made of Q345R steel. The insulation temperature is 705±14℃. The temperature measuring thermocouples used are ordinary K-type thermocouples and stainless steel armored K-type thermocouples. The insulation area of ​​the inner and outer walls of cylinder 3 has a diameter of 2900 mm, with an outer wall insulation thickness of 30-50 mm and an inner wall insulation thickness of 80-100 mm.

[0097] The inclined tube 6 has a diameter of 250mm, a thickness of 65mm, and is made of Q345R material. Its temperature measuring thermocouples include both ordinary K-type thermocouples and stainless steel armored K-type thermocouples. The diameter of the inner and outer wall insulation area of ​​the inclined tube 6 is 250mm, with an outer wall insulation thickness of 5-10mm and an inner wall insulation thickness of 10-20mm.

[0098] Calculate the power capacity at nozzle 6 and cylinder 3 based on the heat treatment temperature and output, respectively:

[0099]

[0100] The power supply at the six inclined pipes is set at 250 kW, and the power supply at the three cylinders is set at 80 kW.

[0101] Where P is the power supply capacity, G is the mass of the heat-treated steel, C is the average specific heat capacity of the steel, T1 is the initial temperature of the steel, T2 is the heating temperature of the steel, and η is the overall efficiency of the induction heating system.

[0102] Based on thermal calculations and economic accounting, two 160KW medium-frequency induction heating power supplies were adopted, with heating at 250kw and 80kw respectively.

[0103] Substitute the power from the two power sources into the formulas for calculating the induced current and number of turns flowing through the first cable 4 and the second cable 13, respectively:

[0104]

[0105]

[0106] Based on the material parameters, r is calculated to be 1.1 × 10⁻⁶. -3 Ω, Z is 66.5 × 10 -6 Ω, with the coefficient k set to 0.95, results in 15 turns of cable for the three parts of the cylinder and 10 turns of cable for the six parts of the inclined pipe.

[0107] Substituting the above values ​​into the following two equations, we obtain the length of the cable in section 6 of the oblique connector:

[0108] L1=(πd+a)n1=8.5m

[0109] The cable lengths for the three sections of the cylinder are:

[0110]

[0111] The cable length at 6 locations was 8.5m, and the cable length at 3 locations on the cylinder was 140m.

[0112] The method for preheating the inclined pipe 6 and the cylinder 3 of the hydrogenation reactor in this embodiment includes the following steps:

[0113] (1) Laying insulation layer and setting thermocouples: Laying insulation layer on the inclined pipe 6 and cylinder 3 of the hydrogenation reactor to be preheated, spot welding thermocouples to the inner and outer walls of the inclined pipe 6 and cylinder 3 of the hydrogenation reactor, and setting the temperature difference threshold between the inner and outer walls to 20℃.

[0114] (2) Set up the cable arranger: release the cable by electric cable reel 8, stretch the cable bearing plate 5, and rotate the rotating shaft 7 to attach the first cable bearing plate and the second cable bearing plate to the hydrogenation reactor nozzle 6 and the outer wall of the cylinder 3 respectively.

[0115] (3) Heating the hydrogenation reactor: Connect the first power supply 1 to the inner connector 10 and the outer connector 9 respectively, and connect the second power supply 2 to the upper connector 12 and the lower connector 11 respectively to heat the hydrogenation reactor cylinder 3 and the inclined pipe 6.

[0116] (4) Adjusting the heating power: When the temperature difference measured by the thermocouples on the inner and outer walls of the inclined pipe 6 and the cylinder 3 of the hydrogenation reactor exceeds 20°C, the controller will reduce the power output and rely on heat conduction to equalize the temperature of the inclined pipe 6 and the cylinder 3.

[0117] When the temperature difference between the inner and outer walls of the inclined pipe 6 and the cylinder 3 of the hydrogenation reactor is less than 20°C, the controller will increase the power output.

[0118] When the thermocouple measures that the radial temperature difference between the cylinder 3 and the axial temperature difference between the inclined pipe 6 of the hydrogenation reactor are not uniform, the position of the cable support slider 106 on the slide rail 102 is adjusted to change the spacing between the first and second cable turns, thereby controlling the radial and axial heating rates to achieve uniform temperature change.

[0119] Figure 7 This is a temperature rise diagram for the induction heating process. Curves 1 and 2 represent the temperature changes of the inclined pipe 6 and the cylinder 3 when the induction cable is laid directly. It can be seen that the heat transfer is different due to the difference in wall thickness, which leads to the anisotropy of deformation and stress at the inclined pipe 6. Curves 3 and 4 represent heating using the induction device of this invention. The two curves basically overlap, and the temperature rise at the cylinder 3 and the inclined pipe 6 is consistent, which solves the problem of different heat treatment requirements for pipes with different wall thicknesses.

[0120] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A heating device for a inclined pipe in a hydrogenation reactor, the hydrogenation reactor comprising a cylindrical body, the inclined pipe being connected to the cylindrical body, characterized in that, The device includes: A cable arranger, positioned around the inclined pipe, is used for arranging cables; The cable is movably mounted on the cable arranger; An insulation layer is laid between the hydrogenation reactor and the cable arrangement device; An electric cable reel, connected to the cable, is used to tighten or release the cable; The cable arranger includes multiple cable carrier plates, one side surface of each cable carrier plate is provided with a slide rail, and multiple cable support sliders are provided on the slide rail; one end of each cable support slider is provided with a groove that mates with the slide rail so as to slide on the slide rail, and the other end is provided with an arc-shaped groove for supporting the cable. The plurality of cable carrier plates include a plurality of first cable carrier plates arranged radially along the inner or outer wall of the cylinder and a plurality of second cable carrier plates arranged axially along the inner or outer wall of the inclined pipe, wherein each first cable carrier plate is rotatably connected to a second cable carrier plate.

2. The apparatus according to claim 1, characterized in that, The slide rail is I-shaped; the direction in which the cable support slider slides on the slide rail is perpendicular to the axis of the arc-shaped groove; Each first cable carrier plate is hinged to a second cable carrier plate via a rotating shaft.

3. The apparatus according to claim 1, characterized in that, The cable includes a first cable and a second cable; The first cable is installed in the arc-shaped groove of the first cable bearing plate, forming a spiral shape from the inside to the outside. The two ends of the first cable are respectively provided with an inner connector and an outer connector. The second cable is installed in the arc-shaped groove of the second cable carrier plate, forming a spiral shape from top to bottom. The two ends of the second cable are respectively provided with an upper connector and a lower connector.

4. The apparatus according to claim 3, characterized in that, The inner and outer connectors are respectively connected to the first power source; the upper and lower connectors are respectively connected to the second power source.

5. The apparatus according to claim 3, characterized in that, The inner connector is connected to the lower connector; The external connector and the upper connector are respectively connected to the power supply.

6. The apparatus according to claim 4, characterized in that, The device also includes a controller and multiple thermocouples; The plurality of thermocouples includes a plurality of first thermocouples uniformly arranged radially along the inclined tube and uniformly arranged axially along the inclined tube. The plurality of first thermocouples are used to measure the temperature difference between the inner and outer walls of the cylinder, and the plurality of second thermocouples are used to measure the temperature difference between the inner and outer walls of the inclined tube. The controller adjusts the power of the first power supply and / or the second power supply according to the temperature difference.

7. The apparatus according to claim 3, characterized in that, The inner connector is connected to the lower connector; The electric cable reel is connected to the upper connector, and starting the electric cable reel tightens or releases the cable.

8. The apparatus according to claim 4, characterized in that, The rated power of the first and second power supplies is calculated using the following formula: The induced current flowing through the first and second cables can be calculated using the following formula: The number of turns of the first and second cables is calculated using the following formula: Wherein, P is the rated power of the first or second power source, C is the average specific heat capacity of the steel, T1 is the initial temperature of the steel, T2 is the heating temperature of the steel, η is the total efficiency of the heating system, ρ is the density of the steel, δ is the penetration depth, R is the outer diameter of the cylinder or inclined pipe, L1 is the length of the heating base material, t is the through-heating time, I is the induced current flowing through the first or second cable, r is the resistance of the base material, and Z is the total impedance of the load system.

9. The apparatus according to claim 8, characterized in that, When the second cable bearing plate is placed on the inner wall of the inclined pipe, the length of the second cable is calculated according to the following formula: L1′=(πd+a-2δπ)n1 When the second cable bearing plate is placed on the outer wall of the inclined pipe, the length of the second cable is calculated according to the following formula: L1=(πd+a)n1 When the first cable bearing plate is placed on the inner or outer wall of the cylinder, the length of the first cable is calculated according to the following formula: Where L1' and L1 are the lengths of the second cable, d is the diameter of the oblique connector, a is the second cable turn spacing, n1 is the number of turns of the second cable, δ is the wall thickness of the oblique connector, L2 is the length of the first cable, m is the first cable turn spacing, and n2 is the number of turns of the first cable.

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