Gravity assisted heat pipe heat exchange device for cooling in graphitization process and use method of gravity assisted heat pipe heat exchange device

Abstract

The invention discloses a gravity assisted heat pipe heat exchange device for graphitization process cooling and a using method. The gravity assisted heat pipe heat exchange device comprises a heat exchange box body, an air inlet channel and an air outlet channel, and a plurality of gravity assisted heat pipes are further installed on the heat exchange box body; the gravity assisted heat pipe comprises an evaporation section and a condensation section. The heat insulation layer is arranged at the bottom of the heat exchange box body and used for isolating the condensation section and the evaporation section of the gravity assisted heat pipe, and the heat exchange box body collects and transmits heat guided out by the gravity assisted heat pipe. The gravity heat pipe is composed of an evaporation section and a condensation section, a heat transfer working medium area and a working medium backflow area are arranged in the gravity heat pipe, heat dissipation fins are arranged on one side of the condensation section to accelerate the heat dissipation rate, and an insertion tip is arranged on one side of the evaporation section and used for being inserted into a graphite sintered finished product to take heat. The condensation section is placed in the heat exchange box body, and the evaporation section is placed in a graphite sintered finished product during use, so that the cooling efficiency of the graphitization process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to a gravity heat pipe heat exchange device for graphitization process cooling and a use method thereof. Background Art

[0002] Graphitization refers to the conversion of non-graphitic carbon into graphitic carbon with a regular, ordered three-dimensional graphite structure through high-temperature heat treatment. Its purpose is to improve the thermal and electrical conductivity of carbon materials, enhance their thermal shock resistance and chemical stability, impart lubricity and wear resistance, and increase their purity. High-temperature heat treatment is used to provide energy for atomic rearrangement and structural transformation, a process that consumes a large amount of energy. Sintering, which converts powdered materials into a dense body, is a traditional process. Generally speaking, the dense body obtained by sintering a powder after forming is a polycrystalline material whose microstructure is composed of crystals, glass, and pores.

[0003] In the graphitization sintering process, cooling of the finished product is a very important step. During the sintering process, the temperature can reach as high as over 2000 degrees Celsius, which means that a large amount of heat needs to be released when the finished product is cooled to make the sintered product reach room temperature. The traditional cooling method of the sintering process is natural cooling, that is, the sintered product is placed in a room temperature environment and heat is exchanged using the principle of air flow. The disadvantage of this cooling method is that the cooling time is long and the cooling efficiency is low. A large amount of heat exchanged by air convection will also dissipate into the air; or by sprinkling water on the surface of the sintering tank and using strong cold air to speed up the heat dissipation efficiency, but this leads to oxidation inside the graphitized product, resulting in damage to the finished product. These methods will also lead to the inability to fully utilize waste heat, the inability to achieve secondary use of energy, and cause environmental pollution. In summary, the traditional graphitization process cooling technology is relatively backward, and there are also problems of environmental pollution and energy loss. There is an urgent need for a new heat exchange device to speed up the heat dissipation rate and improve the cooling efficiency of the graphitization process. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a gravity heat pipe heat exchange device and a method of use for graphitization process cooling, so as to solve the problem of the lack of a graphitization process cooling device in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution to achieve them: a gravity heat pipe heat exchange device for graphitization process cooling, including a heat exchange box and an air inlet and an air outlet installed at both ends of the heat exchange box, and a plurality of gravity heat pipes are also installed on the heat exchange box.

[0006] The gravity heat pipe includes an evaporation section and a condensation section which are connected to each other. The condensation section is located inside the heat exchange box, and the evaporation section is located outside the heat exchange box, and the evaporation sections are located on the same side of the heat exchange box.

[0007] The present invention also has the following technical features: The plurality of gravity heat pipes are installed on the heat exchange box in an array shape.

[0008] The condensing section is also provided with heat dissipation fins, and the evaporating section is provided with an insertion tip on the side facing away from the heat exchange box body.

[0009] The heat exchange box is in a rectangular parallelepiped structure, with two ends connected to a cylindrical air inlet and an air outlet respectively through truncated cone-shaped air vents.

[0010] The air inlet and the air outlet are connected to the vent via connecting flanges respectively.

[0011] A heat insulation layer is provided on the side of the heat exchange box body connected to the gravity heat pipe.

[0012] The gravity heat pipe is a double-layer structure, the interior of the inner pipe constitutes a heat transfer medium pipeline, and the space between the inner and outer pipes constitutes a condensation medium return pipeline.

[0013] The present invention also provides a method for using a gravity heat pipe heat exchange device for cooling a graphitization process, which is implemented using the gravity heat pipe heat exchange device for cooling a graphitization process as described above, and includes the following steps: When in use, the prepared heat exchange box is combined with the gravity heat pipe, and a heat insulation layer is added to the inner surface of the heat exchange box at the connection.

[0014] The assembled heat exchange device is lifted by a heavy crane, and the insertion tip and the evaporation section are vertically inserted and fixed into the finished product after graphitization and sintering.

[0015] Then, an air inlet channel is installed on the air inlet side of the heat exchange box body to connect to the gas generating device, and a heat transfer pipe is installed on the air outlet side of the heat exchange box body to lead to the heat storage or use device.

[0016] The high-temperature heat of the sintered product passes through the evaporation section of the gravity heat pipe. The heat transfer medium in the evaporation section undergoes a gasification phase change due to the heat. The gaseous medium after the phase change is transferred upward to the condensation section through the heat transfer medium pipeline inside the gravity heat pipe.

[0017] The heat is then discharged into the heat exchange box by the heat dissipation fins. At the same time, the gaseous working medium is condensed into liquid in the condensation section due to the efficient heat exchange of the heat dissipation fins. The condensed liquid relies on gravity to flow back to the evaporation section along the condensation fluid return pipe set in the tube wall to complete the autonomous circulation.

[0018] The heat transferred from the heat dissipation fins to the inside of the box is carried away to the outlet by the gas generated by the gas generating device connected to the air inlet channel installed on one side of the air inlet channel, and then the heat carried by the gas is transferred to the heat storage or use device on the side of the air outlet channel.

[0019] Compared with the prior art, the present invention has the following technical effects: (I) The present invention proposes a gravity heat pipe heat exchange device for graphitization process cooling, comprising a heat exchange box. The heat exchange box serves as the main body, with air inlets and outlets installed on both sides for condensation heat exchange. An insulating layer is provided at the bottom of the heat exchange box to isolate the condensing and evaporating sections of the gravity heat pipe. The heat exchange box primarily collects and transfers heat from the gravity heat pipe. The gravity heat pipe comprises an evaporating section and a condensing section, with a heat transfer medium region and a heat medium return region disposed within. One side of the condensing section is provided with heat dissipation fins to accelerate heat dissipation, while the other side of the evaporating section is provided with an insertion tip for insertion into the finished graphite product after sintering to extract heat. The condensing section of the gravity heat pipe is placed within the heat exchange box, and during use, the evaporating section is placed into the finished graphite product after sintering, accelerating the cooling efficiency of the graphitization process.

[0020] (II) This invention proposes a gravity heat pipe heat exchange device for graphitization cooling and graphite sintering. Its rational design and simple operation effectively address the difficulty in rapidly reducing heat after graphite sintering. Furthermore, it utilizes a heat exchanger to collect and reuse this energy, achieving energy conservation and emission reduction, and enabling energy reuse.

[0021] (III) The gravity heat pipe heat exchange device for graphitization process cooling provided by the present invention has a simple structure, convenient operation, safety and reliability, and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the overall structure of the gravity heat pipe heat exchange device for graphitization process cooling of the present invention.

[0023] Figure 2 Schematic diagram of the internal structure of the heat exchange box.

[0024] Figure 3 Schematic diagram of the external structure of the gravity heat pipe.

[0025] Figure 4 Schematic diagram of the internal structure of the gravity heat pipe.

[0026] The meaning of each reference numeral in the accompanying drawings: 1-heat exchange box, 2-air inlet, 3-air outlet, 4-gravity heat pipe, 5-vent, 6-connecting flange, 7-thermal insulation layer.

[0027] 4-1-evaporation section, 4-2-condensation section, 4-3-heat sink fins.

[0028] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0029] All components in the present invention, such as the gravity heat pipe, are components known in the prior art unless otherwise specified.

[0030] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0031] Example 1: This embodiment provides a gravity heat pipe heat exchange device for graphitization process cooling, such as Figures 1-4 As shown, it includes a heat exchange box body 1 and an air inlet duct 2 and an air outlet duct 3 installed at both ends of the heat exchange box body 1. A plurality of gravity heat pipes 4 are also installed on the heat exchange box body 1.

[0032] The gravity heat pipe 4 includes an evaporation section 4-1 and a condensation section 4-2 which are connected to each other. The condensation section 4-2 is located inside the heat exchange box 1, and the evaporation section 4-1 is located outside the heat exchange box 1, and the evaporation section 4-1 is located on the same side of the heat exchange box 1.

[0033] First, the traditional sintering process's heat dissipation is inefficient. Cooling a graphite sintered product from approximately 2000 degrees Celsius to room temperature takes approximately two months, a period that wastes both labor and material resources. Second, the traditional sintering process's heat dissipation method cannot reuse the waste heat, rendering it ineffective for energy reuse. Furthermore, the waste heat released into the atmosphere also causes thermal pollution.

[0034] The patent of this invention is a gravity heat pipe heat exchange device for graphitization process cooling, which consists of a heat exchange box 1 and a gravity heat pipe 4.

[0035] The heat exchange box 1 is composed of four parts: an air inlet 2, an insulation layer 7, a heat exchange box 1, and an air outlet 3. The heat exchange box 1 is the main body, and an air inlet 2 and an air outlet 3 are installed on both sides of the heat exchange box for condensation heat exchange. An insulation layer 7 is provided at the bottom of the heat exchange box 1 to isolate the condensation section 4-2 and the evaporation section 4-1 of the gravity heat pipe 4. The main function of the heat exchange box 1 is to collect and transmit the heat exported by the gravity heat pipe 4. This part can mainly achieve secondary utilization of energy, collect the heat exchanged by the gravity heat pipe 4 and discharge it centrally through the air outlet 3, thereby achieving energy saving and emission reduction.

[0036] The gravity heat pipe 4 is made of stainless steel and consists of an evaporation section 4-1 and a condensation section 4-2. It has internal zones for heat transfer and recirculation. Heat dissipation fins 4-3 are located on one side of the condensation section 4-2 to accelerate heat dissipation. Insertion tips 4-4 are located on one side of the evaporation section 4-1 to improve heat conduction efficiency. During use, the evaporation section 4-1 is inserted into the finished graphite product after sintering, accelerating the cooling efficiency of the graphitization process.

[0037] As a preferred embodiment of this invention: The plurality of gravity heat pipes 4 are installed on the heat exchange box 1 in an array.

[0038] As a preferred embodiment of this invention: The condensing section 4 - 2 is further provided with heat dissipation fins 4 - 3 , and the evaporating section 4 - 1 is provided with an insertion tip 4 - 4 on the side facing away from the heat exchange box 1 .

[0039] As a preferred embodiment of this invention: The heat exchange box 1 is in a rectangular parallelepiped structure, with two ends connected to a cylindrical air inlet 2 and an air outlet 3 respectively through a truncated cone-shaped air vent 5 .

[0040] The air inlet duct 2 and the air outlet duct 3 are connected to the vent 5 via connecting flanges 6 respectively.

[0041] A heat insulating layer 7 is provided on the side of the heat exchange box 1 connected to the gravity heat pipe 4, which is used to isolate the evaporation section 4-1 from the external heat exchange of the condensation section 4-2.

[0042] As a preferred embodiment of this invention: The gravity heat pipe 4 is a double-layer structure, wherein the interior of the inner pipe constitutes a heat transfer medium pipeline, and the space between the inner and outer pipes constitutes a condensation medium return pipeline.

[0043] The specific working process of the present invention is: The heat exchange box body 1, the air inlet duct 2, the heat insulation layer 7, and the air outlet duct 3 together constitute the heat exchange box body. The air inlet duct 2 is set on the left side of the heat exchange box body 1, and the air outlet duct 3 is set on the right side. The heat discharged by the gravity heat pipe 4 is reused to achieve energy saving and emission reduction, and energy is reused.

[0044] The evaporation section 4-1, the condensation section 4-2, the heat transfer medium pipeline, the condensation medium return pipeline, the heat dissipation fins 4-3, and the insertion tip 4-4 constitute the main part of the gravity heat pipe 4. The central part of the gravity heat pipe 4 is the heat transfer medium pipeline, which is filled with the working medium, and the inner wall of the pipeline is the condensation fluid return pipeline.

[0045] The evaporation section 4-1 is connected to the condensation section 4-2, and the lower end of the evaporation section 4-1 is connected to the insertion tip 4-4. The condensation section 4-2 is provided with a heat dissipation fin 4-3 on the outside. The condensation section 4-2 and the heat dissipation fin 4-3 are fixed as a whole in the heat exchange box 1, while the evaporation section 4-1 and the insertion tip 4-4 are exposed outside the heat exchange box 1.

[0046] The gravity heat pipe 4 is made of high temperature resistant heat exchange materials such as high temperature stainless steel.

[0047] When in use, the product of the present invention is lifted by a heavy crane, and then its evaporation section 4-1 and insertion tip 4-4 are inserted into the sintered graphite product. Heat is transferred to the condensation section 4-2 through the evaporation section 4-1 of the gravity heat pipe 4, and then discharged to the inside of the heat exchange box 1 by the heat dissipation fins 4-3. The heat inside the heat exchange box 1 is carried away by the wind of the air inlet duct 2 and connected to the secondary utilization pipeline through the air outlet duct 3.

[0048] Example 2: A method for using a gravity heat pipe heat exchange device for graphitization process cooling is implemented using the gravity heat pipe heat exchange device for graphitization process cooling as described in Example 1, comprising the following steps: When in use, the prepared heat exchange box 1 is combined with the gravity heat pipe 4, and a heat insulation layer 7 is added to the inner surface of the heat exchange box 1 at the connection.

[0049] The assembled heat exchange device is lifted by a heavy crane, and the insertion tip 4-4 and the evaporation section 4-1 are vertically inserted and fixed into the finished product after graphitization and sintering.

[0050] Then, an air inlet channel is installed on the air inlet 2 side of the heat exchange box 1 to connect to the gas generating device, and a heat transfer pipe is installed on the air outlet 3 side of the heat exchange box 1 to lead to the heat storage or use device.

[0051] The high-temperature heat of the sintered product passes through the evaporation section 4-1 of the gravity heat pipe 4, and the heat transfer medium in the evaporation section 4-1 undergoes a gasification phase change due to the heat. The gaseous medium after the phase change is transferred upward to the condensation section 4-2 through the heat transfer medium pipeline inside the gravity heat pipe 4.

[0052] The heat is then discharged into the heat exchange box 1 by the heat dissipation fins 4-3. At the same time, the gaseous working medium is condensed into liquid in the condensation section 4-2 due to the efficient heat exchange of the heat dissipation fins 4-3. The condensed liquid relies on gravity to flow back to the evaporation section 4-1 along the condensation fluid return pipe set in the tube wall to complete the autonomous circulation.

[0053] The heat transferred to the inside of the box by the heat dissipation fins 4-3 is carried away to the outlet duct 3 by the gas generated by the gas generating device connected to the air inlet duct installed on one side of the air inlet duct 2, and then the heat carried by the gas is transferred to the heat storage or use device from one side of the air outlet duct 3.

[0054] The above technical solutions are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of by any technician familiar with the field within the technical scope disclosed by the present invention without creative work are all covered by the protection scope of the present invention.

Claims

1. A gravity heat pipe heat exchange device for graphitization process cooling, comprising a heat exchange box (1) and an air inlet (2) and an air outlet (3) installed at both ends of the heat exchange box (1), characterized in that: The heat exchange box (1) is further provided with a plurality of gravity heat pipes (4); The gravity heat pipe (4) comprises an evaporation section (4-1) and a condensation section (4-2) which are connected to each other, the condensation section (4-2) is located inside the heat exchange box (1), the evaporation section (4-1) is located outside the heat exchange box (1), and the evaporation section (4-1) is located on the same side of the heat exchange box (1).

2. The gravity heat pipe heat exchange device for graphitization process cooling according to claim 1, characterized in that: The plurality of gravity heat pipes (4) are installed in an array on the heat exchange box (1).

3. The gravity heat pipe heat exchange device for graphitization process cooling according to claim 2, characterized in that: The condensing section (4-2) is also provided with a heat dissipation fin (4-3), and the evaporating section (4-1) is provided with an insertion tip (4-4) on the side facing away from the heat exchange box (1).

4. The gravity heat pipe heat exchange device for graphitization process cooling according to claim 3, characterized in that: The heat exchange box (1) is a rectangular parallelepiped structure, with two ends connected to the cylindrical air inlet (2) and the air outlet (3) respectively through truncated cone-shaped air vents (5); The air inlet (2) and the air outlet (3) are respectively connected to the vent (5) via connecting flanges (6); A heat insulation layer (7) is provided on the side of the heat exchange box (1) that is connected to the gravity heat pipe (4).

5. The gravity heat pipe heat exchange device for graphitization process cooling according to claim 4, characterized in that: The gravity heat pipe (4) is a double-layer structure, wherein the interior of the inner pipe constitutes a heat transfer medium pipeline, and the space between the inner and outer pipes constitutes a condensation medium return pipeline.

6. A method for using a gravity heat pipe heat exchange device for cooling a graphitization process, which is implemented using the gravity heat pipe heat exchange device for cooling a graphitization process according to any one of claims 1 to 5, characterized in that: The steps include: When in use, the prepared heat exchange box (1) is combined with the gravity heat pipe (4), and a heat insulation layer (7) is added to the inner surface of the heat exchange box (1) at the connection; The assembled heat exchange device is lifted by a heavy crane, and the insertion tip (4-4) and the evaporation section (4-1) are vertically inserted and fixed into the finished product after graphitization and sintering; Then, an air inlet channel is installed on one side of the air inlet channel (2) of the heat exchange box (1) to connect to the gas generating device, and a heat transfer pipe is installed on one side of the air outlet channel (3) of the heat exchange box (1) to lead to the heat storage or use device; The high-temperature heat of the sintered product passes through the evaporation section (4-1) of the gravity heat pipe (4), and the heat transfer medium in the evaporation section (4-1) is heated to undergo a gasification phase change. The gaseous medium after the phase change is transferred upward to the condensation section (4-2) through the heat transfer medium pipeline inside the gravity heat pipe; The heat is then discharged into the interior of the heat exchange box (1) by the heat dissipation fins (4-3). At the same time, the gaseous working medium is condensed into liquid in the condensation section (4-2) by the efficient heat exchange of the heat dissipation fins (4-3). The condensed liquid flows back to the evaporation section (4-1) along the condensation fluid return pipe provided in the tube wall under the action of gravity to complete the autonomous circulation. The heat transferred from the heat dissipation fins (4-3) to the interior of the box is carried away to the outlet duct (3) by the gas generated by the gas generating device connected to the air inlet duct installed on one side of the air inlet duct (2), and then the heat carried by the gas is transferred to the heat storage or use device on the other side of the air outlet duct (3).

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