Raw material preheating device for silicon carbide production

Abstract

The utility model relates to the technical field of chemical production equipment, in particular to a raw material preheating device for silicon carbide production, which comprises an outer pipe, an inner pipe and an outer pipe, the inner pipes are arranged in the outer pipe and extend in the length direction of the outer pipe, and the multiple inner pipes are arranged in the circumferential direction of the inner wall of the outer pipe in a surrounding mode; the plurality of heating units are respectively arranged in the inner pipes; wherein after the inner pipes are enclosed, a preheating channel is formed in the middle, and an inlet and an outlet of the outer pipe and the preheating channel are located on the same straight line. The heating and exhausting performance of gas is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical production equipment technical field, and more specifically, it relates to a raw material preheating device for silicon carbide production. BACKGROUND

[0002] Silicon carbide is a typical representative of the third generation of semiconductor materials, with high electron mobility, wide band gap, high voltage capacity, high thermal conductivity, strong radiation resistance and other advantages. It directly promotes the rapid development of a series of industries such as semiconductor lighting, display, electric vehicles, etc. In addition, silicon carbide material can be applied to high temperature, high frequency, high power and strong corrosive environment, and has a wide application in the fields of machinery, electronics, chemical industry, energy and other fields.

[0003] The Chinese utility model patent application with publication number CN 119113938 A discloses a silicon-carbon negative electrode material fluidized bed reaction system, which realizes the production of silicon carbide by using a fluidized bed. However, the reaction system still has some problems, for example, the gas is directly transported from the bottom of the fluidized bed to the fluidized bed, which causes the heater used to heat the fluidized bed to need a certain time to heat the gas to the reaction temperature, thereby greatly prolonging the synthesis time of silicon carbide. SUMMARY

[0004] The main purpose of the utility model is to provide a raw material preheating device for silicon carbide production to solve the technical problems mentioned in the background art.

[0005] In order to solve the above technical problems, the utility model provides a raw material preheating device for silicon carbide production, which comprises:

[0006] The outer pipe has an inlet and an outlet at both ends;

[0007] The inner pipe is arranged in the outer pipe and extends along the length direction of the outer pipe. There are multiple inner pipes, which are arranged circumferentially along the inner wall of the outer pipe;

[0008] The heating unit has several units and is arranged in each inner pipe;

[0009] Among them, each inner pipe forms a preheating channel in the middle after being enclosed, and the inlet and outlet of the outer pipe and the preheating channel are on the same straight line.

[0010] In the above technical solution, further comprising:

[0011] The mounting bracket is used to connect and fix the inner pipes;

[0012] Among them, a plurality of mounting holes are formed on the mounting bracket, and the end of the inner pipe passes through the mounting hole.

[0013] In any of the above technical solutions, further, the mounting frame has two groups and is arranged at two sides of the inner pipe.

[0014] In any of the above technical solutions, further, the mounting frame has two groups and is arranged at two sides of the inner pipe.

[0015] The connecting rod is used for connecting the two mounting frames and fixing the two mounting frames to the two ends of the inner pipe.

[0016] In any of the above technical solutions, further, the outer wall of the end of the inner pipe is provided with a radially inward annular groove, and the end of the inner pipe is abutted against the mounting frame after passing through the mounting hole of the mounting frame.

[0017] In any of the above technical solutions, further, the outer walls of the inner pipes are sequentially abutted, so that the preheating channel is a sealed channel in the circumferential direction.

[0018] In any of the above technical solutions, further, the heating unit comprises:

[0019] The sleeve pipe;

[0020] and the heater arranged in the sleeve pipe and used for providing heat to heat the gas in the preheating channel.

[0021] In any of the above technical solutions, further, the outer pipe is cylindrical and the inner pipe is cylindrical.

[0022] Beneficial effects: compared with the prior art, the inlet, the outlet and the preheating channel are arranged on the same straight line, which effectively improves the exhaust performance, the heating unit is arranged around the preheating channel, which effectively improves the heating effect of the gas, and the gas is uniformly heated. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0025] Figure 2 is a schematic diagram of the internal structure of the present application;

[0026] Figure 3 is Figure 2 is an enlarged structural schematic diagram of A in the figure;

[0027] Figure 4It is another internal structure schematic view of the utility model from another angle.

[0028] The reference signs are explained as follows:

[0029] 1, outer tube; 11, inlet; 12, outlet; 2, inner tube; 21, annular groove; 3, heating unit; 31, sleeve; 32, heater; 321, ceramic coil holder; 322, heating wire; 4, preheating channel; 5, mounting frame; 6, connecting rod. DETAILED DESCRIPTION

[0030] In the following, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0031] It should be noted that, as shown in the present application and claims, unless the context clearly indicates otherwise, "one", "a", "an", and / or "the" do not specifically refer to the singular, but also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0032] If the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0033] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing", etc. should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] The production method of silicon carbide is as follows: A fixed amount of silicon carbide seed crystals are added to a fluidized bed, and the fluidized bed heater is turned on to raise the internal temperature to the reaction temperature. After a period of time, raw material gas is transported into the fluidized bed from the bottom to carry out the reaction. Silicon carbide particles can then grow in the fluidized bed and are finally collected. To avoid the raw material gas at room temperature affecting the reaction rate, the raw material gas needs to be preheated during this process. Some current gas preheating devices have relatively complex structures and low heating efficiency. Therefore, this application proposes a preheating device that can improve heating efficiency.

[0036] The preheating device of this application will be described in detail below through the following embodiments.

[0037] Example 1:

[0038] like Figures 1-4 As shown, this embodiment proposes a raw material preheating device for silicon carbide production, including: an outer tube 1, with an inlet 11 and an outlet 12 formed in the middle of both ends respectively; an inner tube 2, disposed inside the outer tube 1 and extending along the length of the outer tube 1, with multiple inner tubes 2 arranged circumferentially around the inner wall of the outer tube 1; and a heating unit 3, having several units, respectively disposed inside each inner tube 2;

[0039] Among them, after the inner tubes 2 are enclosed, a preheating channel 4 is formed in the middle. The inlet 11 and outlet 12 of the outer tube 1 and the preheating channel 4 are on the same straight line. The outer walls of the inner tubes 2 abut against each other in sequence, so that the preheating channel 4 is a sealed channel in the circumferential direction.

[0040] The outer tube 1 is cylindrical, with its inlet 11 and outlet 12 at both ends having a cylindrical structure to facilitate pipe connection; the inner tube 2 is cylindrical. The inner tube 2 serves as the outer shell structure for installing the heating unit 3. Furthermore, by arranging the inner tubes 2 around the perimeter, a chamber is formed in the middle of each inner tube 2. This chamber is the preheating channel 4. Gas enters through the inlet 11 on the outer tube 1, then passes through the preheating channel 4, is preheated within the preheating channel 4, and finally exits from the outlet 12 on the outer tube 1.

[0041] It should be noted that by setting the inlet 11, outlet 12 and preheating channel 4 on the same straight line, this embodiment not only effectively improves its exhaust performance, but also effectively improves the gas heating effect by arranging the heating unit 3 around the preheating channel 4, and also makes the gas heated evenly.

[0042] It should be noted that, in order to ensure the inner diameter of the preheating channel 4, the number of inner tubes 2 is set to at least five, and each inner tube 2 is evenly distributed, and the outer walls of adjacent inner tubes 2 abut against each other in sequence, so that the preheating channel 4 is a sealed channel in the circumferential direction.

[0043] It should be noted that the inner tube 2 is a heat-conducting tube made of heat-conducting material, so as to transfer the heat generated by the heating unit 3 to the preheating channel 4, thereby heating the gas in the preheating channel 4.

[0044] Example 2:

[0045] This embodiment is a further improvement based on Embodiment 1.

[0046] like Figure 3 and Figure 4 As shown, in this embodiment, it also includes: a mounting bracket 5, used to connect and fix each inner tube 2;

[0047] The mounting bracket 5 has several mounting holes, and the end of the inner tube 2 passes through the mounting holes.

[0048] In order to securely install the inner tube 2 inside the outer tube 1, a mounting bracket 5 is provided. Mounting holes are made on the mounting bracket 5, and the end of the inner tube 2 is then inserted into the mounting hole of the mounting bracket 5. This ensures that the inner tubes 2 do not become loose, thus guaranteeing the stability of the preheating channel 4.

[0049] It should be noted that the mounting bracket 5 has a disc-shaped structure, and the mounting holes are arranged along the circumferential direction of the disc. The number of mounting holes is the same as the number of inner tubes 2.

[0050] It should be noted that there is an annular groove 21 radially inwardly opened on the outer wall of the end of the inner tube 2. After the end of the inner tube 2 passes through the mounting hole of the mounting bracket 5, it abuts against the mounting bracket 5.

[0051] In this embodiment, the optimized mounting bracket 5 consists of two sets, which are respectively disposed on both sides of the inner tube 2. By providing two sets of mounting brackets 5, the stability between the inner tubes 2 is improved, and the mounting brackets 5 abut against the inner wall of the outer tube 1.

[0052] In this embodiment, an optimized version further includes a connecting rod 6 for connecting the two mounting brackets 5, thereby fixing the two mounting brackets 5 to both ends of the inner tube 2. Each inner tube 2 is securely mounted on the mounting bracket 5, and the mounting bracket 5 can be directly embedded into the inner tube 2 when installed inside the outer tube 1. However, this method makes the mounting bracket 5 easy to move inside the outer tube 1. Therefore, a connecting rod 6 is provided. The connecting rod 6 is a detachable structure, and the two mounting brackets 5 are connected by the connecting rod 6. In this way, the two mounting brackets 5 can be fixed, which not only increases the firmness of the installation between the mounting bracket 5 and the inner tube 2, but also ensures the stability of the mounting bracket 5 inside the outer tube 1.

[0053] It should be noted that the outlet 12 on the outer tube 1 is a detachable conical structure, which is installed on the outer tube 1 by means of threaded connection. When installing the internal structure of the preheating device, the outlet 12 is removed first, and then the inner tube 2, mounting bracket 5 and other structures are inserted into the outer tube. After the outlet 12 is installed on the outer tube 1, the inner port of the outlet 12 is pressed against the inner tube 2 and the mounting bracket 5 so that it will not move along the length direction of the outer tube 1.

[0054] In this embodiment, there are two connecting rods 6, which are mounted on the outer mounting bracket 5. The connection strength is improved by using two connecting rods 6.

[0055] It should be noted that the connecting rod 6 is a screw structure, with internal threaded holes on the mounting bracket 5. Both ends of the connecting rod 6 are threaded into the internal threaded holes of the two mounting brackets 5 respectively. For ease of installation, the connecting rod 6 is designed as a T-shaped screw, and the end of the T-shaped screw has a ring-shaped structure, making it easy for workers to rotate by hand.

[0056] Example 3:

[0057] This embodiment is a further improvement based on any of the above embodiments.

[0058] like Figure 3 As shown, in this embodiment, the heating unit 3 includes: a sleeve 31; and a heater 32, disposed inside the sleeve 31, for providing heat to heat the gas located in the preheating channel 4.

[0059] The heater 32 mainly consists of a long strip-shaped ceramic coil frame 321, on which a heating wire 322 is wound and a controller is used to control the heating temperature of the heating wire 322. A temperature sensor is installed on the outer wall of the sleeve 31 to detect the temperature of the inner tube 2. The controller controls the current passing through the heating wire 322 based on the temperature signal detected by the temperature sensor, thereby controlling the heating temperature of the heating wire 322.

[0060] The various embodiments of this disclosure 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. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A raw material preheating device for silicon carbide production, characterized in that, include: The outer tube (1) has an inlet (11) and an outlet (12) formed at its two ends respectively; An inner tube (2) is disposed inside the outer tube (1) and extends along the length direction of the outer tube (1). There are multiple inner tubes (2) and they are arranged around the inner wall of the outer tube (1) in a circumferential manner. And heating units (3), having several of them, and respectively disposed in each of the inner tubes (2); Among them, after the inner tubes (2) are enclosed, a preheating channel (4) is formed in the middle, and the inlet (11) and outlet (12) of the outer tube (1) and the preheating channel (4) are on the same straight line.

2. The raw material preheating device for silicon carbide production as described in claim 1, characterized in that, Also includes: Mounting bracket (5) is used to connect and fix each of the inner tubes (2); The mounting bracket (5) has several mounting holes, and the end of the inner tube (2) passes through the mounting holes.

3. The raw material preheating device for silicon carbide production as described in claim 2, characterized in that, There are two sets of mounting brackets (5), which are respectively located on both sides of the inner tube (2).

4. The raw material preheating device for silicon carbide production as described in claim 3, characterized in that, Also includes: A connecting rod (6) is used to connect the two mounting brackets (5) together, so that the two mounting brackets (5) are fixed to both ends of the inner tube (2).

5. The raw material preheating device for silicon carbide production as described in claim 4, characterized in that, The inner tube (2) has an annular groove (21) that is radially inward on the outer wall of its end. After the end of the inner tube (2) passes through the mounting hole of the mounting bracket (5), it abuts against the mounting bracket (5).

6. The raw material preheating device for silicon carbide production as described in claim 5, characterized in that, The outer walls of each inner tube (2) abut against each other in sequence, so that the preheating channel (4) is a sealed channel in the circumferential direction.

7. The raw material preheating device for silicon carbide production as described in claim 1, characterized in that, The heating unit (3) includes: Sleeve (31); And a heater (32), disposed inside the sleeve (31), for providing heat to heat the gas located in the preheating channel (4).

8. The raw material preheating device for silicon carbide production as described in any one of claims 1-7, characterized in that, The outer tube (1) is cylindrical, and the inner tube (2) is cylindrical.

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