Closed silicon carbide smelting device with U-shaped furnace core based on COMSOL mathematical module

Abstract

The utility model discloses a closed silicon carbide smelting device with U-shaped furnace cores based on a COMSOL mathematical module. The closed silicon carbide smelting device comprises a closed furnace body, a movable furnace car and one or more U-shaped furnace cores connected in series, a furnace end wall is arranged on one side of the closed furnace body, positive and negative graphite electrodes are arranged on the furnace end wall, input ends of the positive and negative graphite electrodes are connected with positive and negative electrodes of a power supply, and output ends are conductively communicated with two end parts of the U-shaped furnace core; the graphite electrode cooling device is arranged outside the furnace end wall; a flue gas collecting pipeline is arranged at the top of the furnace body; a furnace door is arranged on the other side of the furnace body, a track is arranged in the furnace body, and a furnace car is movably mounted on the track; and one or more U-shaped furnace cores which are connected in series are arranged in furnace charge through a charging mold during charging. According to the utility model, the influence of the geometric structure of the U-shaped furnace core on the temperature distribution in the furnace is simulated by adopting COMSOL software, a theoretical basis is provided for U-shaped furnace core closed silicon carbide smelting equipment, and large-scale industrial application is promoted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the COMSOL mathematical module is applied to smelting device technical field, concretely is a kind of based on COMSOL mathematical module's U type furnace core airtight smelting silicon carbide device. BACKGROUND

[0002] At present, the following shortcomings exist in domestic silicon carbide smelting: (1) mainly open, the exhaust gas contains more than 70% CO, pollutes, high energy consumption, is not conducive to data recycling; (2) the length of the furnace body of high-power smelting furnace is generally dozens of meters or even more than 100 meters, the furnace core is a linear furnace core, the linear furnace core is connected to the positive and negative poles of the rectifier transformer at both ends, and a large production site area and a long power supply circuit are required to deliver current to the two furnace heads connected to the furnace body. When using a large power supply circuit to deliver power, the power loss increases, which increases the energy consumption of silicon carbide smelting. (3) The furnace body adopts two groups of side walls design, not only increases the cost of building furnace, but also makes the heat generated by silicon carbide smelting furnace easy to lose, which reduces the thermal efficiency of silicon carbide smelting furnace, and then affects the quality of silicon carbide. Therefore, it is necessary to develop a COMSOL mathematical module based U type furnace core airtight smelting silicon carbide device, which is safe and reliable in process, can effectively reduce the energy consumption required for reduction reaction, can safely recover and utilize silicon carbide tail gas, significantly reduces investment cost, and promotes the progress of energy-saving and emission-reducing technology in silicon carbide industry. SUMMARY

[0003] The utility model aims at providing a COMSOL mathematical module based U type furnace core airtight smelting silicon carbide device, which is safe and reliable in process, can effectively reduce the energy consumption required for reduction reaction, can safely recover and utilize silicon carbide tail gas, significantly reduces investment cost, and promotes the progress of energy-saving and emission-reducing technology in silicon carbide industry.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme, a COMSOL mathematical module based U type furnace core airtight smelting silicon carbide device, the device includes airtight furnace body, movable furnace car and single or multiple U type furnace cores in series.

[0005] The side of the closed furnace body is provided with a furnace end wall, the furnace end wall is provided with a first positive electrode graphite electrode and a first negative electrode graphite electrode, and the second positive electrode graphite electrode and the second negative electrode graphite electrode are arranged at the corresponding positions of the side wall of the furnace car; when the device works, the input ends of the first positive electrode graphite electrode and the first negative electrode graphite electrode are connected with the positive and negative poles of the rectifier transformer power supply, the output ends of the first positive electrode graphite electrode and the first negative electrode graphite electrode are respectively connected with the two end portions of the U-shaped furnace core through the second positive electrode graphite electrode and the second negative electrode graphite electrode, and the electrode cooling device is arranged outside the furnace end wall; and the top of the furnace body is provided with a flue gas collecting pipeline.

[0006] The other side of the furnace body opposite to the furnace end wall is provided with an openable furnace door, the furnace body is provided with a track through a support frame, the furnace car is movably arranged on the track and is pulled in and out of the furnace body by the traction device along the track.

[0007] The single or multiple U-shaped furnace cores are made of graphite powder accumulation, the U-shaped furnace core is arranged in the furnace charge through a charging mold according to the charging process when the furnace charge is loaded, and the U-shaped furnace core and the furnace charge are loaded into the furnace car and then pulled into the furnace body through the traction device.

[0008] Further, the U-shaped furnace core spacing (D) satisfies D=2R×(1-η), η is an overlapping coefficient (0.1-0.4), and R is a heat-affected radius of a single furnace core.

[0009] Further, the U-shaped furnace core center bending radius (r) satisfies r ≥ 3 times the furnace core diameter or the furnace core width.

[0010] Further, the number (N) of U-shaped furnace cores satisfies 1≤N≤5.

[0011] Further, the first positive electrode graphite electrode and the first negative electrode graphite electrode are provided with an insulating wall.

[0012] Further, the cross-sectional shape of the closed furnace body is one of rectangular, circular, upper-arched or left-right double-arched structures.

[0013] Further, the cross section of the U-shaped furnace core is circular or square, so as to ensure the uniformity of the current density distribution.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. The utility model discloses a COMSOL Multiphysics software is simulated the influence of the geometric structure of U type furnace core to the temperature distribution in the furnace, determines the distance of U type furnace core, determines the bending radius of U type furnace core, determines the quantity of U type furnace core, determines the uniformity of the thermal field in the furnace and the coverage of reaction area, makes the heat superposition between two adjacent furnace cores, makes the thermal field coverage maximization, reduces the heat preservation material covered by single furnace core outer layer, reduces the heat loss, improves the heat utilization rate, improves the output.

[0016] 2, the smelting mode of closed furnace body structure is different from the traditional open sintering furnace, it can produce high-quality carbon silicon-based new material, and can recycle tail gas to synthesize renewable other valuable energy, promote the extension of carbon silicon-based industry chain, fundamentally solve the problem of high pollution, high energy consumption and low quality in the current domestic open kiln smelting industry.

[0017] 3, the U type furnace core silicon carbide smelting furnace is provided with the positive electrode graphite electrode and the negative electrode graphite electrode for connecting the positive electrode and the negative electrode of the power supply device on one furnace head, shortens the large circuit power supply line, reduces the power supply line power loss, in turn reduces the energy consumption of silicon carbide smelting single yield, and saves the use amount of bus and conductive copper bar in the power supply line.

[0018] 4, the graphite electrode cooling device is arranged on the furnace end wall of one side of the furnace body, even if the cooling water leaks, it is in the outside of the furnace body, can guarantee the safety of smelting in the closed furnace body, the other side of the furnace body is provided with an openable furnace door, can guarantee the smooth entry and exit of the furnace car in the furnace body, solve 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. ACCURACY

[0019] Figure 1 It is the whole structure schematic diagram of the utility model;

[0020] Figure 2 It is the cross section structure schematic diagram of the furnace body, furnace car and U type furnace core;

[0021] Figure 3 It is the cross section structure schematic diagram of the furnace body;

[0022] Figure 4 It is the structure schematic diagram of single U type furnace core and multiple U type furnace core series connection;

[0023] In the drawing: 1-electrode cooling device, 2-furnace body, 21-furnace end wall, 31-first positive electrode graphite electrode, 32-second positive electrode graphite electrode, 33-first negative electrode graphite electrode, 34-second negative electrode graphite electrode, 4-furnace car, 5-U type furnace core, 6-rail, 7-furnace door, 8-flue gas collection pipeline, 9-insulating wall, 10-furnace charge. SPECIFIC IMPLEMENTATION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0025] Please refer to Figures 1-3 The present application provides a technical scheme, a device for closed smelting silicon carbide based on a COMSOL mathematical module, which comprises a closed furnace body 2, a movable furnace car 4 and a single or multiple series U-shaped furnace core 5;

[0026] A furnace end wall 21 is arranged on one side of the closed furnace body 2, and a first positive graphite electrode 31 and a first negative graphite electrode 33 are arranged on the furnace end wall 21; a second positive graphite electrode 32 and a second negative graphite electrode 34 are arranged at the corresponding positions of the side wall of the furnace car 4; when the device is working, the input ends of the first positive graphite electrode 31 and the first negative graphite electrode 33 are connected with the positive and negative poles of a rectifier transformer power supply, and the output ends of the first positive graphite electrode 31 and the first negative graphite electrode 33 are respectively connected with the two end portions of the U-shaped furnace core 5 through the second positive graphite electrode 32 and the second negative graphite electrode 34; the 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 out; and a flue gas collecting pipeline 8 is arranged on the top of the furnace body 2;

[0027] 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 car 4 is movably installed on the track 6 and is pulled in and out of the furnace body 2 along the track 6 by a traction device;

[0028] The single or multiple series U-shaped furnace core 5 is formed by piling up graphite powder; the U-shaped furnace core 5 is arranged in the furnace charge 10 according to a charging process through a charging mold when the furnace charge 10 is charged; and after the U-shaped furnace core 5 and the furnace charge 10 are loaded into the furnace car 4, the U-shaped furnace core 5 is pulled into the furnace body 2 through the traction device.

[0029] Further, the spacing (D) of the U-shaped furnace core 5 satisfies D=2R×(1-η), η is an overlapping coefficient (0.1-0.4), and R is a heat-affected radius of a single furnace core.

[0030] Further, the center bending radius (r) of the U-shaped furnace core 5 satisfies r ≥ 3 times the diameter of the U-shaped furnace core 5 or the width of the U-shaped furnace core 5. When the cross section of the U-shaped furnace core 5 is circular, the value is the diameter; and when the cross section of the U-shaped furnace core 5 is square, the value is the width.

[0031] Further, the number (N) of the U-shaped furnace core 5 satisfies 1≤N≤5.

[0032] Furthermore, an insulating wall 9 is provided 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.

[0033] Please see Figure 4 The cross-sectional shape of the sealed furnace body 2 is one of the following: rectangular, circular, upper arch, or left and right double arch structure.

[0034] Furthermore, the cross-section of the U-shaped furnace core 5 is circular or square to ensure the uniformity of current density distribution.

[0035] The working principle of this utility model is as follows:

[0036] This invention uses COMSOL Multiphysics software to simulate the influence of the geometric structure of the U-shaped furnace core 5 arranged in the furnace charge on the temperature distribution inside the furnace. It determines the distance between the U-shaped furnace cores 5, their bending radius, the number of U-shaped furnace cores 5, the uniformity of the thermal field inside the furnace, and the coverage of the reaction zone. This maximizes the thermal field coverage by superimposing heat between adjacent furnace cores, reducing the amount of insulation material covering the outer layer of each furnace core, thus reducing heat loss, improving heat utilization, and increasing output. Based on the determined furnace core dimensions, a charging mold is prepared before charging. During the charging process, the mold is placed into the furnace charge according to the charging schedule. The U-shaped furnace cores 5 containing graphite powder are then placed inside the mold, and the furnace charge is placed around the U-shaped furnace cores 5. After all the furnace charge is loaded, the furnace car is pulled into the furnace body 2 using a traction device. The furnace door 4 is closed, the circuit is connected, and the raw materials begin to heat up. The furnace charge undergoes a chemical reaction at a temperature of 1600~2700℃, producing silicon carbide. The furnace gas is collected by a flue gas collection pipe, then cooled, purified, and reused. This invention uses COMSOL Multiphysics software to simulate the influence of the geometric structure of the U-shaped furnace core 5 arranged in the furnace charge on the temperature distribution inside the furnace. This provides a theoretical basis for designing the U-shaped furnace core closed silicon carbide smelting equipment, making the design and practical application of the equipment more scientific and rational, helping to improve the success rate of actual use of the equipment, and promoting the large-scale industrial application of the equipment.

Claims

1. A device for the closed smelting of silicon carbide in a U-shaped core based on the COMSOL mathematical module, characterized by: The device comprises a sealed furnace body (2), a movable furnace car (4), and a single or multiple U-shaped furnace core (5) in series; A furnace end wall (21) is arranged on one side of the sealed furnace body (2), the furnace end wall (21) is provided with a first positive graphite electrode (31) and a first negative graphite electrode (33), a second positive graphite electrode (32) and a second negative graphite electrode (34) are arranged at the corresponding position of the side wall of the furnace car (4), when the device works, the input end of the first positive graphite electrode (31) and the first negative graphite electrode (33) is connected with the positive and negative poles of the rectifier transformer power supply, the output end of the first positive graphite electrode (31) and the first negative graphite electrode (33) is respectively connected with the two end portions of the U-shaped furnace core (5) through the second positive graphite electrode (32) and the second negative graphite electrode (34) in electrically conductive communication; the 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 out; a flue gas collecting pipeline (8) is arranged on 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 car (4) is movably installed on the track (6) and is pulled in and out of the furnace body (2) along the track (6) by a traction device; The single or multiple U-shaped furnace core (5) in series is made of graphite powder accumulation, the U-shaped furnace core (5) is arranged in the furnace charge (10) through a charging mold according to the charging process when charging, after the U-shaped furnace core (5) and the furnace charge (10) are loaded into the furnace car (4), the U-shaped furnace core (5) is pulled into the furnace body (2) by the traction device.

2. A device for the closed smelting of silicon carbide in a U-shaped core based on the COMSOL mathematical module according to claim 1, characterized in that: The spacing (D) of the U-shaped furnace core (5) satisfies D=2R×(1-η), η is the overlap coefficient (0.1-0.4), and R is the heat affected radius of a single furnace core.

3. The device for closed smelting of silicon carbide in U-shaped core based on COMSOL mathematical module according to claim 1, characterized by the fact that: The center bending radius (r) of the U-shaped furnace core (5) satisfies r ≥ 3 times the furnace core diameter or the furnace core width.

4. The device for closed smelting of silicon carbide in U-shaped core based on COMSOL mathematical module according to claim 1, characterized by the fact that: The number (N) of the U-shaped furnace core (5) satisfies 1≤N≤5.

5. The device for closed smelting of silicon carbide in U-shaped core based on COMSOL mathematical module according to claim 1, characterized by the fact that: 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).

6. The device for the U-shaped core sealed smelting of silicon carbide based on COMSOL mathematical module according to claim 1, characterized in that: The cross-sectional shape of the sealed furnace body (2) is one of rectangular, circular, upper-arched, or left-right double-arched structure.

7. The device for airtight smelting silicon carbide with U-shaped core based on COMSOL mathematical module according to claim 1, characterized in that: The cross section of the U-shaped furnace core (5) is circular or square, which ensures the uniformity of current density distribution.

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