Graphite high-temperature purification furnace integrated cooling system

Abstract

The utility model discloses a graphite high temperature purification furnace integrated type cooling system belongs to high temperature heat treatment equipment technical field, and it includes double -deck water -cooled furnace shell, gas -liquid separation tank and a plurality of gas -liquid mixed injection pump, one side, through gas -liquid two -phase mixed injection technology, has improved the cooling efficiency significantly, and micro -bubble absorbs a large number of latent heat of vaporization when high -temperature wall surface breakage, and the heat exchange coefficient is improved significantly than traditional single -phase water -cooled, and the cooling time is shortened obviously, on the other hand, operating cost is reduced, mainly utilizes the existing gas source and cooling water of factory, need not additional configuration large -scale refrigeration equipment, and the economic benefit is remarkable.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature heat treatment equipment technology, specifically to an integrated cooling system for a graphite high-temperature purification furnace, which is particularly suitable for the rapid and safe cooling process of a graphite high-temperature purification furnace. Background Technology

[0002] High-temperature graphite purification furnaces are key equipment for preparing high-purity graphite materials, with operating temperatures reaching 2500–3000℃. After the purification process is complete, the furnace body requires a lengthy cooling process before it can be opened to remove the product. Traditional cooling methods mainly rely on natural cooling or simple single-phase water cooling, which have the following prominent problems:

[0003] 1. The cooling efficiency is low. Natural cooling takes too long, and it may take more than 50 hours to drop from 2500℃ to 200℃, which seriously affects the equipment utilization rate and production cycle. Although simple single-phase water cooling speeds up the cooling speed to some extent, the cooling rate is still slow due to the limitations of heat exchange efficiency and safety considerations.

[0004] 2. The cooling process is uncontrollable. Traditional cooling methods make it difficult to precisely control the cooling rate. Excessive cooling can easily generate thermal stress, leading to cracking and damage of expensive graphite heating elements and insulation layers. Uneven cooling in different parts can also cause structural deformation and affect the lifespan of the equipment.

[0005] 3. High energy consumption. In order to speed up cooling, external heat exchangers or refrigeration units are sometimes required, which increases the complexity of the system and operating costs. At the same time, the long cooling time also means continuous energy consumption.

[0006] Therefore, there is an urgent need in this field for a dedicated cooling system for graphite purification furnaces that can achieve rapid, uniform, and controllable cooling in order to resolve the contradiction between long production cycles and equipment safety. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing an integrated cooling system for a graphite high-temperature purification furnace, which can achieve a rapid, uniform, and controllable cooling process, significantly shorten the production cycle, and ensure equipment safety.

[0008] To achieve the above objectives, this utility model provides an integrated cooling system for a graphite high-temperature purification furnace, which includes a double-layer water-cooled furnace shell, a gas-liquid separation tank, and several gas-liquid mixing jet pumps.

[0009] The double-layer water-cooled furnace shell has several vertically arranged partitions that divide it into several rows of cooling chambers; several gas-liquid mixing jet pumps are evenly distributed around the outer wall of the double-layer water-cooled furnace shell, and each row of cooling chambers corresponds to a set of gas-liquid mixing jet pumps, which are located at the bottom of the cooling chambers.

[0010] Each of the aforementioned gas-liquid mixing jet pumps includes a drive fluid pipe, a mixing throat, and a diffuser pipe connected in sequence. The inner diameter of the mixing throat is smaller than that of the drive fluid pipe, and the inner diameter of the mixing throat is smaller than that of the diffuser pipe. The drive fluid pipe is connected to a 0.6–0.8 MPa compressed air source via a flexible hose, and an air path regulating valve is installed on the flexible hose. A bypass pipe is installed on the side wall of the mixing throat, and the bypass pipe is connected to a cooling water supply pipe. The mixing throat causes water and air to mix violently to form a microbubble two-phase flow. A water path regulating valve is installed on the cooling water supply pipe. The diffuser pipe connects to the cooling chamber and is used to convert the kinetic energy of the mixed high-speed fluid into static pressure to ensure that the gas-liquid two-phase cooling medium can enter the cooling chamber with sufficient pressure and stability, thereby achieving uniform and efficient heat exchange.

[0011] The gas-liquid separator is located on top of the double-layer water-cooled furnace shell. The inlet end of the gas-liquid separator is connected to an annular pipe. Multiple connecting pipes are arranged around the circumference of the annular pipe. Each connecting pipe corresponds to a row of cooling chambers and is connected to the cooling chambers. The gas separated by the gas-liquid separator is discharged directly into the atmosphere, and the liquid separated by the gas-liquid separator enters the water-cooled circulation equipment.

[0012] Furthermore, this utility model provides an integrated cooling system for a graphite high-temperature purification furnace, wherein the gas-water ratio is controlled to be within the range of 3:1 to 10:1 (volume ratio) through a gas path regulating valve and a water path regulating valve.

[0013] Furthermore, this utility model provides an integrated cooling system for a graphite high-temperature purification furnace, wherein a turbulence generator is provided inside the double-layer water-cooled furnace shell to enhance heat exchange efficiency.

[0014] Furthermore, this utility model provides an integrated cooling system for a graphite high-temperature purification furnace, wherein the turbulence generator inside the double-layer water-cooled furnace shell adopts a surface protrusion structure with a height of 2-3 mm and a diameter of 5-8 mm, and the surface protrusion structure is disposed on the partition.

[0015] Furthermore, this utility model provides an integrated cooling system for a graphite high-temperature purification furnace, wherein the cooling water supply pipe is arranged along the circumference of the double-layer water-cooled furnace shell, and several branch pipes are evenly distributed around the circumference of the cooling water supply pipe. Each branch pipe corresponds to a bypass pipe and is connected to the bypass pipe. The cooling water supply pipe is connected to the water-cooled circulation equipment.

[0016] The integrated cooling system for a high-temperature graphite purification furnace disclosed in this application has the following advantages compared to existing technologies:

[0017] 1. By using gas-liquid two-phase mixing and spraying technology, the cooling efficiency is significantly improved. When the microbubbles burst at the high-temperature wall surface, they absorb a large amount of latent heat of vaporization, and the heat transfer coefficient is significantly improved compared with the traditional single-phase water cooling, and the cooling time is significantly shortened.

[0018] 2. Low operating costs, mainly utilizing the factory's existing gas source and cooling water, without the need for additional large-scale refrigeration equipment, resulting in significant economic benefits. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the integrated cooling system structure of a graphite high-temperature purification furnace according to this utility model;

[0020] Figure 2 This is a partial structural schematic diagram of an integrated cooling system for a graphite high-temperature purification furnace according to this utility model.

[0021] The components include: 1. Double-layer water-cooled furnace shell; 2. Gas-liquid separator; 3. Baffle plate; 4. Cooling chamber; 5. Drive fluid pipe; 6. Mixing throat pipe; 7. Diffuser pipe; 8. Gas path regulating valve; 9. Bypass pipe; 10. Cooling water supply pipe; 11. Water path regulating valve; 12. Ring pipe; 13. Connecting pipe; 14. Water distribution pipe; 15. Turbulence generator. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] like Figure 1 and Figure 2 As shown, this embodiment provides an integrated cooling system for a graphite high-temperature purification furnace, which includes a double-layer water-cooled furnace shell 1, a gas-liquid separation tank 2, and several gas-liquid mixing jet pumps.

[0026] The double-layer water-cooled furnace shell 1 is divided into several rows of cooling chambers 4 by multiple vertically arranged partitions 3; several gas-liquid mixing jet pumps are evenly distributed on the outer side wall of the double-layer water-cooled furnace shell 1, and each row of cooling chambers 4 corresponds to a set of gas-liquid mixing jet pumps, which are located at the bottom of the cooling chambers 4.

[0027] Each of the aforementioned gas-liquid mixing jet pumps includes a drive fluid pipe 5, a mixing throat pipe 6, and a diffuser pipe 7 connected in sequence. The inner diameter of the mixing throat pipe 6 is smaller than that of the drive fluid pipe 5, and the inner diameter of the mixing throat pipe 6 is smaller than that of the diffuser pipe 7. The drive fluid pipe 5 is connected to a compressed air source of 0.6–0.8 MPa via a flexible hose, and an air path regulating valve 8 is installed on the flexible hose. A bypass pipe 9 is installed on the side wall of the mixing throat pipe 6, and the bypass pipe 9 is connected to a cooling water supply pipe 10. The mixing throat pipe 6 causes water and air to mix violently to form a microbubble two-phase flow. A water path regulating valve 11 is installed on the cooling water supply pipe 10. The diffuser pipe 7 is connected to the cooling chamber 4 and is used to convert the kinetic energy of the mixed high-speed fluid into static pressure to ensure that the gas-liquid two-phase cooling medium can enter the cooling chamber 4 with sufficient pressure and stability to achieve uniform and efficient heat exchange.

[0028] The gas-liquid separator 2 is located on top of the double-layer water-cooled furnace shell 1. The inlet end of the gas-liquid separator 2 is connected to an annular pipe 12. Multiple connecting pipes 13 are arranged around the annular pipe 12. Each connecting pipe 13 corresponds to a row of cooling chambers 4 and is connected to the cooling chambers 4. The gas separated by the gas-liquid separator 2 is directly discharged into the atmosphere, and the liquid separated by the gas-liquid separator 2 enters the water-cooled circulation equipment. The cooling water supply pipe 10 is arranged around the circumference of the double-layer water-cooled furnace shell 1. Several branch pipes 14 are evenly distributed around the circumference of the cooling water supply pipe 10. Each branch pipe 14 corresponds to a bypass pipe 9 and is connected to the bypass pipe 9. The cooling water supply pipe 10 is connected to the water-cooled circulation equipment.

[0029] The gas-water ratio is controlled to be 3:1 to 10:1 (volume ratio) by gas regulating valve 8 and water regulating valve 11.

[0030] As a preferred embodiment, the double-layer water-cooled furnace shell 1 is provided with a turbulence generator 15 to enhance heat exchange efficiency. The turbulence generator 15 inside the double-layer water-cooled furnace shell 1 adopts a surface protrusion structure with a height of 2-3 mm and a diameter of 5-8 mm. The surface protrusion structure is disposed on the partition plate 3.

[0031] This embodiment provides the working process and principle of an integrated cooling system for a graphite high-temperature purification furnace as follows: The air pump is started, injecting high-pressure gas into the drive fluid pipes 5 of each gas-liquid mixing jet pump. After entering the mixing throat 6, the gas velocity rapidly increases due to the reduced cross-section, similar to a Venturi tube structure. A negative pressure is formed in the bypass pipe 9. Cooling water sequentially enters the mixing throat 6 through the water distribution pipe 14 and the bypass pipe 9. The cooling water mixes with compressed air in the mixing throat 6 to form a two-phase gas-liquid cooling medium, which then enters the diffuser pipe 7. The high-speed mixture... The kinetic energy of the fluid is converted into static pressure to ensure that the gas-liquid two-phase cooling medium can enter the cooling chamber 4 with sufficient pressure and stability. The gas-liquid two-phase cooling medium comes into contact with the high-temperature wall surface, and the microbubbles burst and absorb a large amount of latent heat of vaporization. During this process, the gas-liquid ratio on the corresponding side can be flexibly adjusted according to the measured local temperature difference to change the heat dissipation efficiency. Finally, the gas and liquid phases enter the annular pipe 12 through the connecting pipe 13 and finally converge into the gas-liquid separator 2. The gas separated by the gas-liquid separator 2 is directly discharged into the atmosphere, and the liquid separated by the gas-liquid separator 2 enters the water-cooled circulation equipment.

[0032] Any aspects not detailed in this application are well-known to those skilled in the art.

[0033] The preferred embodiments of this application have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this application without inventive effort. Therefore, any technical solutions that can be obtained by those skilled in the art based on the concept of this application through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An integrated cooling system for a high-temperature graphite purification furnace, characterized in that, Includes a double-layer water-cooled furnace shell, a gas-liquid separator, and several gas-liquid mixing jet pumps; The double-layer water-cooled furnace shell has several vertically arranged partitions that divide it into several rows of cooling chambers; several gas-liquid mixing jet pumps are evenly distributed around the outer wall of the double-layer water-cooled furnace shell, and each row of cooling chambers corresponds to a set of gas-liquid mixing jet pumps, which are located at the bottom of the cooling chambers. Each of the aforementioned gas-liquid mixing jet pumps includes a drive fluid pipe, a mixing throat pipe, and a diffuser pipe connected in sequence. The inner diameter of the mixing throat pipe is smaller than that of the drive fluid pipe, and the inner diameter of the mixing throat pipe is smaller than that of the diffuser pipe. The drive fluid pipe is connected to a 0.6–0.8 MPa compressed air source via a flexible hose. An air path regulating valve is installed on the flexible hose. A bypass pipe is installed on the side wall of the mixing throat pipe, and the bypass pipe is connected to a cooling water supply pipe. A water path regulating valve is installed on the cooling water supply pipe. The diffuser pipe connects to the cooling chamber and is used to convert the kinetic energy of the mixed high-speed fluid into static pressure to ensure that the gas-liquid two-phase cooling medium can enter the cooling chamber with sufficient pressure and stability. The gas-liquid separator is located on top of the double-layer water-cooled furnace shell. The inlet end of the gas-liquid separator is connected to an annular pipe. Multiple connecting pipes are arranged around the circumference of the annular pipe. Each connecting pipe corresponds to a row of cooling chambers and is connected to the cooling chambers. The gas separated by the gas-liquid separator is discharged directly into the atmosphere, and the liquid separated by the gas-liquid separator enters the water-cooled circulation equipment.

2. The integrated cooling system for the graphite high-temperature purification furnace according to claim 1, characterized in that, The air-to-water ratio can be adjusted from 3:1 to 10:1 by using air and water regulating valves.

3. The integrated cooling system for the graphite high-temperature purification furnace according to claim 1, characterized in that, The double-layer water-cooled furnace shell is equipped with a turbulence generator to enhance heat exchange efficiency.

4. The integrated cooling system for the graphite high-temperature purification furnace according to claim 3, characterized in that, The turbulence generator inside the double-layer water-cooled furnace shell adopts a surface protrusion structure with a height of 2-3 mm and a diameter of 5-8 mm. The surface protrusion structure is set on the partition.

5. The integrated cooling system for the graphite high-temperature purification furnace according to claim 1, characterized in that, The cooling water supply pipe is arranged around the circumference of the double-layer water-cooled furnace shell. Several branch pipes are evenly distributed around the circumference of the cooling water supply pipe. Each branch pipe corresponds to and is connected to a bypass pipe. The cooling water supply pipe is connected to the water-cooled circulation equipment. A water circuit regulating valve is installed on each branch pipe.

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