Manufacturing method of U-shaped furnace core closed silicon carbide smelting equipment based on COMSOL mathematical module

Abstract

The invention discloses a manufacturing method of U-shaped furnace core closed silicon carbide smelting equipment based on a COMSOL mathematical module, which comprises the following steps of: simulating the influence of a geometric structure of a U-shaped furnace core on temperature distribution in a furnace by adopting COMSOL Multiphysics software, determining the distance of the U-shaped furnace core, and determining the bending radius of the U-shaped furnace core; determining the number of furnace cores; the uniformity of a thermal field in the furnace and the coverage range of a reaction zone are determined; the temperature of the reaction zone is ensured to reach 2000-2500 DEG C; and designing and determining the structure of the U-shaped furnace core closed silicon carbide smelting equipment according to a theoretical basis provided by simulating the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace. The invention provides a theoretical basis for designing the closed silicon carbide smelting equipment with the U-shaped furnace core, so that the design and practical application of the equipment are more scientific and reasonable, the success rate of practical use of the equipment is favorably improved, and the large-scale industrial application of the equipment is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of applying the COMSOL mathematical module to smelting devices, and specifically to a manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module. Background Technique

[0002] Currently, the main disadvantages of silicon carbide smelting in China are as follows: First, it is mainly open-type, and the exhaust gas discharged contains more than 70% CO, which causes serious pollution, high energy consumption, and is not conducive to the recycling of materials; Second, the length of the furnace body of high-power smelting furnaces is generally dozens of meters or even more than one hundred meters, and the furnace core is a straight-line furnace core. The two ends of the straight-line furnace core are respectively connected to the positive and negative poles of the rectifier transformer. A large production site area and a long large-circuit power supply line are required to transmit the current to the two furnace heads connected to the furnace body. When using the large-circuit power supply line to transmit electric energy, the power loss will be increased, thus increasing the unit energy consumption of silicon carbide smelting. Third, the furnace body adopts a two-group side wall design, which not only increases the furnace construction cost, but also makes the heat generated by the silicon carbide smelting furnace easily dissipated, thus reducing the thermal efficiency of the silicon carbide smelting furnace and then affecting the quality of silicon carbide. Therefore, it is necessary to develop a manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module, which has reliable process safety, can effectively reduce the energy consumption required for the reduction reaction, can safely recycle and utilize the silicon carbide tail gas, significantly reduce the investment cost, and promote the energy conservation and emission reduction technology progress of the silicon carbide industry. Summary of the Invention

[0003] The purpose of the present invention is to provide a manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module, which has reliable process safety, can effectively reduce the energy consumption required for the reduction reaction, can safely recycle and utilize the silicon carbide tail gas, significantly reduce the investment cost, and promote the energy conservation and emission reduction technology progress of the silicon carbide industry.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module. First, use the COMSOL Multiphysics software to simulate the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace, determine the distance of the U-shaped furnace core, determine the bending radius of the U-shaped furnace core; determine the number of furnace cores; determine the uniformity of the thermal field in the furnace and the coverage range of the reaction zone; ensure that the temperature in the reaction zone reaches 2000 - 2500 °C; then design and determine the structure of the U-shaped furnace core airtight smelting silicon carbide device based on the theoretical basis provided by simulating the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace; the specific steps are as follows: Step 1: Establish a multi-physics coupling model, covering the following key factors: ① Electromagnetic field: Calculate the current density distribution and Joule heat distribution; ②Temperature field: To simulate the temperature gradient in the furnace, it is necessary to ensure that the temperature in the reaction zone reaches 2000 - 2500 °C and is uniform; ③Chemical reaction kinetics: Correlate temperature with reaction rate; ④Material transfer: The escape of gas CO and the packing density of solid raw materials affect heat conduction; Step 2: Optimization of key parameters of the U-shaped furnace core: ①Optimization of the U-shaped furnace core spacing (D): Through simulation verification, calculate the current density distribution, and determine the heat-affected area; Adjust the spacing (D), observe the temperature field coverage rate and the maximum / minimum temperature difference, and determine the furnace core spacing D = 2R×(1 - η), where η is the overlap coefficient (0.1 - 0.4), and R is the heat-affected radius of a single furnace core; The furnace core spacing should ensure that the heat field evenly covers the reaction zone to avoid local overheating or cold zones; ②Optimization of the center bending radius (r) of the U-shaped furnace core: Through simulation verification, r ≥ 3 times the furnace core diameter or furnace core width to avoid local overheating caused by sudden changes in the current path; ③Optimization of the number (N) of U-shaped furnace cores: Under the limitation of the furnace chamber volume, maximize the reaction zone volume (V_react), and at the same time avoid current interference between furnace cores. The upper limit of the number of furnace cores is determined by the furnace chamber size and the minimum spacing D_min: Where L_furnace is the effective length of the furnace chamber, and D_min is the minimum safety spacing; Step 3: Based on the theoretical basis provided by simulating the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace in Steps 1 and 2, design and determine the structure of the U-shaped furnace core closed smelting silicon carbide equipment. The structure of this equipment includes a closed furnace body, a moving furnace car, and one or more series-connected U-shaped furnace cores; One side of the closed furnace body is provided with a furnace end wall. The furnace end wall is provided with a first positive graphite electrode and a first negative graphite electrode. At the corresponding positions on the side wall of the furnace car, there are a second positive graphite electrode and a second negative graphite electrode. When the device works, the input ends of the first positive graphite electrode and the first negative graphite electrode are connected to the positive and negative poles of the rectifier transformer power supply. The output ends of the first positive graphite electrode and the first negative graphite electrode are respectively electrically connected to the two ends of the U-shaped furnace core through the second positive graphite electrode and the second negative graphite electrode; An electrode cooling device is provided outside the furnace end wall where the first positive graphite electrode and the first negative graphite electrode extend; A flue gas collection pipe is provided at the top of the furnace body; On the other side of the furnace body opposite to the furnace end wall, there is an openable furnace door. Inside the furnace body, there are tracks provided through a support frame. The furnace car is movably installed on the tracks and is pulled in and out of the furnace body by a traction device along the tracks; The single or multiple series-connected U-shaped furnace cores are formed by piling up graphite powder. When loading materials, the U-shaped furnace cores are arranged in the furnace charge through a loading die according to the loading process. After the U-shaped furnace cores and the furnace charge are loaded into the furnace car, they are pulled into the furnace body through a traction device.

[0005] Further, the distance (D) between the U-shaped furnace cores satisfies 1.5R ≤ D ≤ 1.8R, where R is the thermal influence radius of a single furnace core.

[0006] Further, the number (N) of the U-shaped furnace cores satisfies 1 ≤ N ≤ 5.

[0007] Further, insulating walls are arranged between the first positive graphite electrode and the first negative graphite electrode, and between the second positive graphite electrode and the second negative graphite electrode.

[0008] Further, the cross-sectional shape of the closed furnace body is one of a rectangular shape, a circular shape, an upper arch shape, or a left-right double arch shape.

[0009] Further, the cross-section of the U-shaped furnace core is circular or square to ensure the uniformity of the current density distribution.

[0010] The technical effects and advantages of the present invention: 1. The present invention uses the COMSOL Multiphysics simulation system to construct an electromagnetic-thermal-chemical coupling model, simulates the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace, determines the uniformity of the thermal field in the furnace and the coverage range of the reaction zone, provides a theoretical basis for designing the U-shaped furnace core closed smelting silicon carbide equipment, makes the design and practical application of the equipment more scientific and reasonable, helps to improve the success rate of the actual use of the equipment, and promotes the large-scale industrial application of the equipment.

[0011] 2. The present invention makes a closed furnace body structure, which is different from the traditional open sintering furnace. It can not only produce high-quality carbon-silicon-based new materials, but also recycle the tail gas to synthesize other renewable valuable energy, promoting the extension of the carbon-silicon-based industrial chain; fundamentally solving the problems of high pollution, high energy consumption, and low quality in the current domestic open kiln smelting industry.

[0012] 3. The present invention uses the U-shaped furnace core to smelt silicon carbide, and a positive graphite electrode and a negative graphite electrode for connecting with the positive and negative poles of the power supply device are arranged on one furnace head, shortening the large circuit power supply line, reducing the power loss of the power supply line, thereby reducing the single production energy consumption of silicon carbide smelting, and at the same time saving the usage amount of busbars and conductive copper bars in the power supply line.

[0013] 4. The graphite electrode cooling device of the present invention is arranged on the furnace end wall on one side of the furnace body. Even if the cooling water leaks, it is outside the furnace body, which can ensure the safety of smelting in the airtight furnace body. The other side of the furnace body is provided with an openable furnace door, which can ensure the smooth entry and exit of the furnace car into and out of the furnace body, solving the problem that the furnace head wall is arranged on both sides of the furnace body and blocks the entry and exit of the furnace car. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic cross-sectional structure diagram of the furnace body, furnace car, and U-shaped furnace core; Figure 3 is a schematic cross-sectional structure diagram of the furnace body; Figure 4 is a schematic structure diagram of a single U-shaped furnace core and a series connection of multiple U-shaped furnace cores; In the figure: 1 - electrode cooling device, 2 - furnace body, 21 - furnace end wall, 31 - first positive graphite electrode, 32 - second positive graphite electrode, 33 - first negative graphite electrode, 34 - second negative graphite electrode, 4 - furnace car, 5 - U-shaped furnace core, 6 - track, 7 - furnace door, 8 - flue gas collection pipe, 9 - insulating wall, 10 - furnace charge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0016] A manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module provided by the present invention. First, use the COMSOL Multiphysics software to simulate the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace, determine the distance of the U-shaped furnace core, determine the bending radius of the U-shaped furnace core; determine the number of furnace cores; determine the uniformity of the thermal field in the furnace and the coverage range of the reaction zone; ensure that the temperature in the reaction zone reaches 2000 - 2500 °C; then design and determine the structure of the U-shaped furnace core airtight smelting silicon carbide device based on the theoretical basis provided by the simulation of the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace; the specific steps are as follows: Step 1. Establish a multi-physics coupling model, covering the following key factors: ① Electromagnetic field: Calculate the current density distribution and Joule heat distribution; 1) Electromagnetic field equation (simplified Maxwell's equations) Under low-frequency alternating current, ignoring the displacement current, using the quasi-static approximation: ▽×H = J ▽·J = 0 J = σ(T)E E = -▽φ Symbol Explanation: H: Magnetic field strength (A / m) J: Current density (A / m²) σ(T): Electrical conductivity of graphite powder φ: Electric potential (V) 2) Joule heat generation (energy conservation equation) Joule heat generated when current passes through graphite powder and raw materials:

[0017] Combined with the heat conduction equation:

[0018] Symbol Explanation: ρ: Material density (kg / m³) Cp: Specific heat capacity (J / (kg·K)) k: Thermal conductivity (W / (m·K), varying with temperature) Qloss: Boundary heat loss (radiation + convection, calculated using Stefan - Boltzmann law) ② Temperature field: Simulate the temperature gradient in the furnace, ensuring that the temperature in the reaction zone reaches 2000 - 2500 °C and is uniform; ③ Chemical reaction kinetics: Correlate temperature with reaction rate; Chemical reaction kinetics model The SiC formation rate is related to temperature and raw material concentration, using the Arrhenius equation:

[0019] · Symbol Explanation: A: Pre - exponential factor (to be experimentally fitted, unit: s -1 ) Ea: Activation energy (about 400 - 600 kJ / mol, related to raw material purity) α,β: Reaction orders (usually take α = 1, β = 3) ④ Mass transfer: The escape of gas CO and the packing density of solid raw materials affect heat conduction; Step 2: Optimization of key parameters of the U - shaped furnace core ① Optimization of the U-shaped core spacing (D): Through simulation verification, calculate the current density distribution to determine the heat-affected area; adjust the spacing (D), observe the temperature field coverage rate and the maximum / minimum temperature difference, and determine the core spacing D = 2R×(1 - η), where η is the overlap coefficient (0.1 - 0.4) and R is the heat-affected radius of a single core; the core spacing should ensure that the heat field evenly covers the reaction area to avoid local overheating or cold areas; Mathematical derivation of the U-shaped core spacing (D) Objective: Minimize the temperature gradient in the overlapping area of the heat fields of adjacent cores.

[0020] Assume that the heat field distribution of a single U-shaped core is an axisymmetric Gaussian model:

[0021] where is the heat-affected radius of a single core.

[0022] When the spacing between two cores is D, the temperature distribution in the overlapping area is:

[0023] It is required that the temperature fluctuation in the overlapping area ≤ 5%:

[0024] Through numerical solution, the optimal spacing Dopt ≈ 1.6R can be obtained; Calibration of the heat-affected radius (R) of a single core Energize a single core in an inert atmosphere, record the diffusion of the temperature field with an infrared thermal imager, and fit:

[0025] Obtain the effective thermal diffusion coefficient through nonlinear regression k / ρCp; ② Optimization of the center bending radius (r) of the U-shaped core: Through simulation verification, r ≥ 3 times the core diameter or core width to avoid local overheating caused by sudden changes in the current path; when the cross-section of the U-shaped core 5 is circular, the value is the diameter, and when the cross-section of the U-shaped core 5 is square, the value is the width; ③ Optimization of the number of U-shaped cores (N): Under the limitation of the furnace volume, maximize the reaction zone volume (V_react), and at the same time avoid current interference between cores. The upper limit of the number of cores is determined by the furnace size and the minimum spacing D_min:

[0026] where L_furnace is the effective length of the furnace and D_min is the minimum safety spacing; Reference for typical simulation results: Comparison between U-shaped cores and traditional single cores

[0027] Step 3: Design and determine the structure of the closed smelting silicon carbide equipment with a U-shaped hearth based on the theoretical basis provided by simulating the influence of the geometric structure of the U-shaped hearth on the temperature distribution in the furnace in Steps 1 and 2. As Figure 1-2 shown, the structure of the equipment includes a closed furnace body 2, a moving furnace truck 4, and one or more U-shaped hearths 5 connected in series; One side of the closed furnace body 2 is provided with a furnace end wall 21. A first positive graphite electrode 31 and a first negative graphite electrode 33 are arranged on the furnace end wall 21. Second positive graphite electrode 32 and second negative graphite electrode 34 are arranged at corresponding positions on the side wall of the furnace truck 4. When the device works, the input ends of the first positive graphite electrode 31 and the first negative graphite electrode 33 are connected to the positive and negative poles of the rectifier transformer power supply. The output ends of the first positive graphite electrode 31 and the first negative graphite electrode 33 are respectively electrically connected to the two end parts of the U-shaped hearth 5 through the second positive graphite electrode 32 and the second negative graphite electrode 34. An electrode cooling device 1 is arranged outside the furnace end wall 21 where the first positive graphite electrode 31 and the first negative graphite electrode 33 extend. A flue gas collection pipe 8 is arranged at the top of the furnace body 2; A furnace door 7 that can be opened is arranged on the other side of the furnace body 2 opposite to the furnace end wall 21. A track 6 is arranged in the furnace body 2 through a support frame. The furnace truck 4 is movably installed on the track 6 and is pulled in and out of the furnace body 2 by a traction device along the track 6; One or more U-shaped hearths 5 connected in series are formed by stacking graphite powder. When loading materials, the U-shaped hearth 5 is arranged in the furnace charge 10 according to the loading process through a loading die. After the U-shaped hearth 5 and the furnace charge 10 are loaded into the furnace truck 4, they are then pulled into the furnace body 2 by the traction device.

[0028] Further, the distance (D) between the U-shaped hearths 5 satisfies 1.5R ≤ D ≤ 1.8R, where R is the thermal influence radius of a single hearth.

[0029] Further, the number (N) of the U-shaped hearths 5 satisfies 1 ≤ N ≤ 5.

[0030] Further, an insulating wall 9 is arranged between the first positive graphite electrode 31 and the first negative graphite electrode 33, and between the second positive graphite electrode 32 and the second negative graphite electrode 34.

[0031] Further, the cross-sectional shape of the closed furnace body 2 is one of a rectangular shape, a circular shape, an upper arch shape, or a left-right double arch shape.

[0032] Further, the cross-section of the U-shaped hearth 5 is circular or square to ensure the uniformity of the current density distribution.

[0033] The present invention uses an electromagnetic-thermal-chemical coupling model constructed in the COMSOL Multiphysics simulation system to simulate the influence of the geometric structure of the U-shaped hearth 5 on the temperature distribution in the furnace, determine the uniformity of the thermal field in the furnace and the coverage range of the reaction zone, providing a theoretical basis for the design of the airtight silicon carbide smelting equipment with the U-shaped hearth 5, making the design and practical application of the equipment more scientific and reasonable, helping to improve the success rate of the actual use of the equipment, and promoting the large-scale industrial application of the equipment.

[0034] The present invention adopts the structure of an airtight furnace body 2, which is different from the traditional open sintering furnace. It can not only produce high-quality carbon-silicon-based new materials, but also recycle the tail gas to synthesize other renewable valuable energy, promoting the extension of the carbon-silicon-based industrial chain; fundamentally solving the problems of high pollution, high energy consumption and low quality in the current domestic open-kiln smelting industry.

[0035] The present invention uses the U-shaped hearth 5 to smelt silicon carbide, and a positive graphite electrode and a negative graphite electrode for connecting to the positive and negative electrodes of the power supply device are arranged on one furnace head, shortening the large-circuit power supply line, reducing the power loss of the power supply line, thereby reducing the unit energy consumption of silicon carbide smelting, and at the same time saving the usage amount of busbars and conductive copper bars in the power supply line.

[0036] The present invention arranges the graphite electrode cooling device 1 on the side furnace end wall of the furnace body 2. Even if the cooling water leaks, it is outside the furnace body 2, which can ensure the safety of smelting in the airtight furnace body 2. The other side of the furnace body 2 is provided with an openable furnace door 7, which can ensure the smooth entry and exit of the furnace truck 4 into and out of the furnace body 2, solving the problem that the furnace head wall blocks the entry and exit of the furnace truck 4 on both sides of the furnace body 2.

[0037] From the reference of typical simulation results: compared with the traditional single hearth, the yield of the U-shaped hearth has increased by 31.7%, the energy consumption has decreased by 15.2%, and the non-uniformity of the temperature distribution has decreased.

Claims

1. A manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module, characterized in that: First, use COMSOL Multiphysics software to simulate the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace, determine the distance of the U-shaped furnace core, determine the bending radius of the U-shaped furnace core, and determine the number of U-shaped furnace cores; determine the uniformity of the thermal field in the furnace and the coverage range of the reaction zone; ensure that the temperature in the reaction zone reaches 2000 - 2500 °C; then design and determine the structure of the U-shaped furnace core closed smelting silicon carbide equipment based on the theoretical basis provided by simulating the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace; the specific steps are as follows: Step 1: Establish a multi-physics coupling model, covering the following key factors: ① Electromagnetic field: Calculate the current density distribution and Joule heat distribution; ② Temperature field: Simulate the temperature gradient in the furnace, and ensure that the temperature in the reaction zone reaches 2000 - 2500 °C and is uniform; ③ Chemical reaction kinetics: Correlate temperature with reaction rate; ④ Material transport: The escape of gas CO and the packing density of solid raw materials affect heat conduction; Step 2: Optimization of key parameters of the U-shaped furnace core: ① Optimization of the U-shaped furnace core spacing (D): Through simulation verification, calculate the current density distribution, and determine the thermal influence area; adjust the spacing (D), observe the temperature field coverage rate and the maximum / minimum temperature difference, and determine the U-shaped furnace core spacing D = 2R×(1−η), where η is the overlap coefficient (0.1 - 0.4), and R is the thermal influence radius of a single furnace core; the furnace core spacing needs to ensure that the thermal field uniformly covers the reaction zone and avoid local overheating or cold zones; ② Optimization of the center bending radius (r) of the U-shaped furnace core: Through simulation verification, r ≥ 3 times the furnace core diameter or furnace core width to avoid local overheating caused by sudden changes in the current path; ③ Optimization of the number (N) of U-shaped furnace cores: Under the limitation of the furnace chamber volume, maximize the reaction zone volume (V_react), and at the same time avoid current interference between furnace cores. The upper limit of the number of furnace cores is determined by the furnace chamber size and the minimum spacing D_min: wherein \(L_{furnace}\) is the effective length of the furnace chamber, and \(D_{min}\) is the minimum safety distance; Step 3: Design and determine the structure of the U-shaped furnace core closed smelting silicon carbide equipment based on the theoretical basis provided by simulating the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace in Step 1 and Step 2. The structure of this equipment includes a closed furnace body (2), a moving furnace truck (4), and one or more series-connected U-shaped furnace cores (5); One side of the closed furnace body (2) is provided with a furnace end wall (21). A first positive graphite electrode (31) and a first negative graphite electrode (33) are arranged on the furnace end wall (21). Second positive graphite electrodes (32) and second negative graphite electrodes (34) are arranged at corresponding positions on the side wall of the furnace truck (4). When the device works, the input ends of the first positive graphite electrode (31) and the first negative graphite electrode (33) are connected to the positive and negative poles of the rectifier transformer power supply. The output ends of the first positive graphite electrode (31) and the first negative graphite electrode (33) are respectively electrically connected to both ends of the U-shaped furnace core (5) through the second positive graphite electrode (32) and the second negative graphite electrode (34); electrode cooling devices (1) are arranged outside the furnace end wall (21) where the first positive graphite electrode (31) and the first negative graphite electrode (33) extend; a flue gas collection pipe (8) is arranged at the top of the furnace body (2); The furnace body (2) is provided with an openable furnace door (7) on the other side opposite to the furnace end wall (21). A track (6) is arranged in the furnace body (2) through a support frame. The furnace car (4) is movably installed on the track (6) and is pulled in and out of the furnace body (2) by a traction device along the track (6). Single or multiple series-connected U-shaped furnace cores (5) are formed by piling up graphite powder. When loading materials, the U-shaped furnace cores (5) are arranged in the furnace charge (10) through a charging die according to the charging process. After the U-shaped furnace cores (5) and the furnace charge (10) are loaded into the furnace car (4), they are then pulled into the furnace body (2) by a traction device.

2. The manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module according to claim 6, characterized in that: The distance (D) between the U-shaped furnace cores (5) satisfies 1.5R ≤ D ≤ 1.8R, where R is the thermal influence radius of a single furnace core.

3. The manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module according to claim 1, characterized in that: The number (N) of the U-shaped furnace cores (5) satisfies 1 ≤ N ≤ 5.

4. The manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module according to claim 1, wherein: Insulating walls (9) are arranged between the first positive graphite electrode (31) and the first negative graphite electrode (33), and between the second positive graphite electrode (32) and the second negative graphite electrode (34).

5. The manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module according to claim 1, characterized in that: The cross-sectional shape of the closed furnace body (2) is one of a rectangular shape, a circular shape, an upper-arch shape, or a left-right arch shape.

6. The manufacturing method of a U-shaped furnace core airtight smelting silicon carbide device based on the COMSOL mathematical module according to claim 1, wherein: The cross-section of the U-shaped furnace core (5) is circular or square to ensure the uniformity of the current density distribution.

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