Hard carbon material high-temperature rapid cooling device and cooling method

Abstract

The invention relates to a hard carbon material high-temperature rapid cooling device and method.The device comprises a high-temperature furnace body, a graded cooling cavity, a conveyor and a temperature control system, and the discharging end of the high-temperature furnace body communicates with the feeding end of the graded cooling cavity; the conveyor drives the hard carbon blanks to enter the graded cooling cavity from the high-temperature furnace body and then is discharged from the discharging end of the graded cooling cavity, the graded cooling cavity is sequentially provided with a primary cooling section, a uniform cooling section and a slow cooling section according to the forward moving direction of the hard carbon blanks, and a primary cooling mechanism is arranged in the primary cooling section; the primary cooling mechanism is used for carrying out primary cooling on a hard carbon blank which just enters, and a uniform cooling mechanism is arranged in the uniform cooling section; the uniform cooling mechanism is used for carrying out secondary cooling on the hard carbon blank subjected to primary cooling, and a slow cooling mechanism is arranged in the slow cooling section; the slow cooling mechanism cools the hard carbon blank subjected to secondary cooling for the third time, a multi-stage matched cooling mode is adopted, the hard carbon blank can be stably cooled stage by stage, the material cannot stay in a high-temperature area for a long time, the problems of grain growth, too high graphitization degree and peroxidation are avoided, the temperature control system controls the cooling temperature of the primary cooling section, the uniform cooling section and the slow cooling section, and the cooling efficiency is improved. And the temperature gradients of different cooling stages can be precisely regulated and controlled, the cooling requirements of hard carbon blanks of different specifications are met, practicability is high, and the application range is wide.

Description

Technical Field

[0001] This invention relates to the field of hard carbon material manufacturing, and specifically to a high-temperature rapid cooling device and cooling method for hard carbon materials. Background Technology

[0002] Hard carbon materials, due to their high specific surface area, good electrical conductivity, and chemical stability, are widely used in sodium-ion battery anodes, wear-resistant materials, and adsorbent materials. The preparation of hard carbon materials typically requires a high-temperature carbonization process, and the cooling process after carbonization is crucial to the microstructure and properties of hard carbon.

[0003] In existing technologies, the cooling of hard carbon materials after high-temperature carbonization is achieved through natural cooling, single air cooling, or water cooling. This approach has the following drawbacks: the natural cooling rate is slow, and the hard carbon billet remains in the high-temperature range for too long, which can easily lead to grain growth, excessive graphitization, and over-oxidation, resulting in a decrease in its energy storage performance; the cooling rate of single air cooling or water cooling is uncontrollable, which can easily cause excessive temperature differences between the inside and outside of the billet, generating thermal stress cracks and affecting the mechanical strength of the material; at the same time, traditional cooling devices cannot accurately control the temperature gradient at different cooling stages, making it difficult to adapt to the cooling requirements of hard carbon billets of different specifications. Summary of the Invention

[0004] The purpose of this technology is to provide a high-temperature rapid cooling device and method for hard carbon materials, in order to solve the technical problems of slow cooling rate, numerous structural defects, and low temperature control accuracy in existing high-temperature cooling processes for hard carbon materials. The specific technical solution is as follows: A rapid cooling device for high-temperature carbonization of hard carbon materials includes a high-temperature furnace body, a staged cooling chamber, a conveyor, and a temperature control system. The high-temperature furnace body is equipped with heating components, where the hard carbon billet is heated and carbonized. The discharge end of the high-temperature furnace body is connected to the inlet end of the staged cooling chamber. The conveyor passes through the staged cooling chamber, driving the hard carbon billet from the high-temperature furnace body into the staged cooling chamber and then out of the discharge end. The staged cooling chamber is sequentially divided into an initial cooling section, a uniform cooling section, and a slow cooling section according to the direction of the hard carbon billet's movement. The initial cooling section contains an initial cooling mechanism that cools the newly entered hard carbon billet once. The uniform cooling section contains a uniform cooling mechanism that cools the hard carbon billet a second time after the first cooling. The slow cooling section contains a slow cooling mechanism that cools the hard carbon billet a third time after the second cooling. The temperature control system controls the cooling temperatures of the initial cooling section, the uniform cooling section, and the slow cooling section.

[0005] In a preferred embodiment of the device of the present invention, the staged cooling chamber is a circular barrel. The primary cooling mechanism consists of an inert gas container, a gas pipe, and multiple gas nozzles. The inert gas container is filled with inert gas and is connected to one end of the gas pipe. The gas pipe surrounds the interior of the staged cooling chamber, and multiple gas nozzles are installed on the side of the gas pipe. The gas nozzles are located in the primary cooling section. The equalization cooling mechanism consists of a heat exchange coil, a first chilled water tank, a first high-pressure water pump, a first chiller, and multiple first water pipes. The heat exchange coil is installed around the equalization cooling section. The first high-pressure water pump drives the water in the first chilled water tank... Chilled water enters the inlet of the heat exchange coil through the first water pipe, and the outlet of the heat exchange coil is connected to the first chiller through the first water pipe. The first chiller cools the chilled water discharged from the heat exchange coil to the set temperature and then discharges it back to the chilled water tank. The slow cooling mechanism includes a second chiller, a second chilled water tank, a second high-pressure water pump, a high-pressure nozzle, and multiple second water pipes. The second chiller drives chilled pure water through the second water pipes to the second chilled water tank. The second high-pressure water pump drives the pure water in the second chilled water tank through the second water pipes to the high-pressure nozzle. The high-pressure nozzle is directed at the hard carbon material in the slow cooling section.

[0006] As a preferred embodiment of the device of the present invention, the inert gas is nitrogen, the outlet direction of the gas nozzle is at an angle of 30°-60° to the conveying direction of the hard carbon billet, the chilled water flowing in the heat exchange coil is low-temperature chilled water liquid at 1℃-5℃, and the distance between two adjacent tubes of the heat exchange coil is 5cm-15cm.

[0007] As a preferred embodiment of the device of the present invention, the temperature control system includes a PLC controller, an electronic temperature sensor, an electronic flow regulating valve, and an electronic pressure sensor. Electronic temperature sensors are installed in the initial cooling section, the uniform cooling section, and the slow cooling section. The electronic temperature sensors dynamically monitor the ambient temperature of each cooling section. Electronic flow regulating valves are installed in the air pipe, the first water pipe, and the second water pipe. The electronic flow regulating valves dynamically adjust the cooling rate of each cooling section. Electronic pressure sensors are installed in the air pipe, the first water pipe, and the second water pipe. The electronic pressure sensors detect the pressure in each pipe. The electronic temperature sensor, the electronic flow regulating valve, and the electronic pressure sensor are electrically connected to the PLC controller.

[0008] As a preferred embodiment of the device of the present invention, the conveyor is a belt conveyor using a high-temperature resistant conveyor belt.

[0009] A method for rapidly cooling down the hard carbon material after high-temperature carbonization, as described above, includes the following steps: S1. Place the hard carbon billet in a high-temperature furnace, heat the hard carbon billet to 500-800℃ and hold it at that temperature for 1-5 hours. S2. The conveyor drives the heat-insulated hard carbon billet to be transported to the staged cooling chamber at a rate of 1-20 m / min; S3. The hard carbon billet enters the primary cooling section of the staged cooling chamber. The PLC controller sends a command to the primary cooling mechanism based on the temperature data collected by the electronic temperature sensor in the primary cooling section. The primary cooling mechanism injects inert gas into the hard carbon billet at a pressure of 0.1-0.2MPa, cooling the hard carbon billet from 500-800℃ to 200-300℃ at a rate of 50-100℃ / min. S4. The hard carbon billet enters the cooling section of the graded cooling chamber. The PLC controller sends a command to the cooling mechanism based on the temperature data collected by the electronic temperature sensor in the cooling section. The electronic flow regulating valve controls the chilled water flow of the heat exchange coil to cool the hard carbon billet from 200-300℃ to 100-200℃ at a rate of 10-30℃ / min. S5. The hard carbon billet enters the slow cooling section of the graded cooling chamber. The PLC controller sends a command to the slow cooling mechanism, and the high-pressure nozzle sprays pure water onto the hard carbon billet, controlling the temperature gradient of the slow cooling section at 5-10℃ / min, so that the hard carbon billet is cooled to room temperature. S6. After cooling is complete, the conveying mechanism will send the hard carbon finished product out from the discharge end of the grading cooling chamber.

[0010] As a preferred embodiment of the method of the present invention, in step S3, the temperature of the inert gas is room temperature, and the gas flow rate in the initial cooling section during the injection process is 0.5-2 m / s.

[0011] As a preferred embodiment of the method of the present invention, in step S4, the cooling water flow rate of the heat exchange coil is 5-10 L / min, and the temperature fluctuation range in the cooling zone does not exceed ±5℃.

[0012] As a preferred embodiment of the method of the present invention, in steps S2, S3, and S4, electronic temperature sensors corresponding to the initial cooling section, the uniform cooling section, and the slow cooling section dynamically monitor temperature data. When the temperature reaches the set value, the conveyor is started to move the hard carbon material forward.

[0013] Beneficial effects: The staged cooling chamber is sequentially divided into an initial cooling section, a homogenizing cooling section, and a slow cooling section according to the forward movement direction of the hard carbon billet. The initial cooling section contains an initial cooling mechanism that cools the newly arrived hard carbon billet once. The homogenizing cooling section contains a homogenizing cooling mechanism that cools the hard carbon billet a second time after the first cooling. The slow cooling section contains a slow cooling mechanism that cools the hard carbon billet a third time after the second cooling. This multi-stage cooling method allows the hard carbon billet to cool down steadily step by step, preventing the material from remaining at high temperatures for too long and avoiding problems such as grain growth, excessive graphitization, and over-oxidation. It also avoids excessive temperature differences between the inside and outside of the billet, which can cause thermal stress cracks and affect the mechanical strength of the material. The temperature control system controls the cooling temperature of the initial cooling section, homogenizing cooling section, and slow cooling section, and can precisely regulate the temperature gradient of different cooling stages to adapt to the cooling requirements of hard carbon billets of different specifications. It is highly practical and has a wide range of applications. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an overall illustration of the present invention; Figure 3 This is a schematic diagram of the electrical connections between the cooling mechanisms and the PLC controller of the present invention. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0016] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0017] like Figure 1 and 2 As shown, Figure 1The center arrow indicates the material's forward direction. A rapid cooling device for high-temperature carbonization of hard carbon materials includes a high-temperature furnace body 1, a staged cooling chamber 2, a conveyor 3, and a temperature control system. The high-temperature furnace body 1 is equipped with a heating element that heats the hard carbon material. The hard carbon billet is carbonized inside the high-temperature furnace body 1. The outlet end of the high-temperature furnace body 1 is connected to the inlet end of the staged cooling chamber 2. The conveyor 3 passes through the staged cooling chamber 2, driving the hard carbon billet from the high-temperature furnace body 1 into the staged cooling chamber 2 and finally out of the staged cooling chamber 2. The material is discharged from the end. The graded cooling chamber 2 is set up in sequence according to the forward movement direction of the hard carbon billet: initial cooling section 2a, uniform cooling section 2b, and slow cooling section 2c. The initial cooling section 2a is equipped with an initial cooling mechanism 5. The initial cooling mechanism 5 cools the hard carbon billet that has just entered. The uniform cooling section 2b is equipped with a uniform cooling mechanism 6. The uniform cooling mechanism 6 cools the hard carbon billet a second time after the first cooling. The slow cooling section 2c is equipped with a slow cooling mechanism 7. The slow cooling mechanism 7 cools the hard carbon billet a third time after the second cooling. The temperature control system 4 controls the cooling temperature of the initial cooling section 2a, uniform cooling section 2b, and slow cooling section 2c.

[0018] like Figure 2 and 3 As shown, the staged cooling chamber 2 is a circular barrel. The primary cooling mechanism 5 consists of an inert gas container 51, a gas pipe 52, and multiple gas nozzles 53. The inert gas container 51 can be a gas storage tank, and inert gas is contained inside the inert gas container 51. The inert gas container 51 is connected to one end of the gas pipe 52, which surrounds the interior of the staged cooling chamber 51. Multiple gas nozzles 53 are installed on the side of the gas pipe 52, and the gas nozzles 53 are located in the primary cooling section 2a. The equalization cooling mechanism 6 consists of a heat exchange coil 61, a first chilled water tank 62, a first high-pressure water pump 63, a first chiller 64, and multiple first water pipes 65. The heat exchange coil 61 is installed around the interior of the equalization cooling section 2b. The chilled water is initially stored in the first chilled water tank 62, and the first high-pressure water pump 63 drives the chilled water in the first chilled water tank 62. The water enters the inlet of the heat exchange coil 61 through the first water pipe 65. The outlet of the heat exchange coil 61 is connected to the first chiller 64 through the first water pipe 65. The first chiller 64 cools the chilled water discharged from the heat exchange coil 61 to the set temperature and then discharges it back to the chilled water tank 62, thus forming a recirculated refrigerant. The slow cooling mechanism 7 includes a second chiller 71, a second chilled water tank 72, a second high-pressure water pump 73, a high-pressure nozzle 74, and multiple second water pipes 75. An external pure water source supplies water to the second chiller 71. The second chiller 71 drives the chilled pure water through the second water pipes 75 to the second chilled water tank 72. The second high-pressure water pump 73 drives the pure water in the second chilled water tank 72 through the second water pipes 75 to the high-pressure nozzle 74. The high-pressure nozzle 74 is directed at the hard carbon material of the slow cooling section 2c.

[0019] Specifically, the inert gas is nitrogen, and the outlet direction of the gas nozzle 53 is at an angle of 30°-60° to the conveying direction of the hard carbon billet, which can effectively spray the nitrogen onto the hard carbon material. The chilled water flowing in the heat exchange coil 61 is a low-temperature chilled water liquid at 1℃-5℃. The distance between two adjacent tubes of the heat exchange coil 61 is 5cm-15cm to provide sufficient heat exchange space. The conveyor 3 is a belt conveyor using a high-temperature resistant conveyor belt.

[0020] like Figure 3 As shown, the temperature control system 4 includes a PLC controller 41, an electronic temperature sensor 42, an electronic flow regulating valve 43, and an electronic pressure sensor 44. Electronic temperature sensors 42 are installed in the initial cooling section 2a, the uniform cooling section 2b, and the slow cooling section 2c. The electronic temperature sensors 42 dynamically monitor the ambient temperature of each cooling section to adjust the cooling rate in real time. Electronic flow regulating valves 43 are installed in the gas pipe 52, the first water pipe 65, and the second water pipe 75. The electronic flow regulating valves dynamically adjust the cooling rate of each cooling section, specifically adjusting the delivery speed of nitrogen, chilled water, and pure water. Electronic pressure sensors 42 are installed in the gas pipe 52, the first water pipe 65, and the second water pipe 75 to detect the pressure in each pipe. The electronic temperature sensor 42, the electronic flow regulating valve 43, and the electronic pressure sensor 44 are electrically connected to the PLC controller 41.

[0021] A method for rapidly cooling a hard carbon material after high-temperature carbonization using the above-mentioned device includes the following steps: S1. The hard carbon billet is placed in the high-temperature furnace body 1, and the hard carbon billet is heated to 500-800℃ and held for 1h to 5h, and the hard carbon billet is heated and carbonized. S2. Conveyor 3 drives the heat-insulated hard carbon billet to be transported to the staged cooling chamber at a rate of 1-20 m / min; S3. The hard carbon billet enters the primary cooling section 2a of the staged cooling chamber. The PLC controller 41 sends a command to the primary cooling mechanism based on the temperature data collected by the electronic temperature sensor in the primary cooling section. The primary cooling mechanism injects inert gas from the nozzle 53 at a pressure of 0.1-0.2 MPa into the hard carbon billet, cooling it from 500-800℃ to 200-300℃ at a rate of 50-100℃ / min. The advantage of using nitrogen for primary cooling is that it prevents peroxidation; the hard carbon billet will not undergo peroxidation at high temperatures in the inert gas environment. The surface of the sodium electrode anode material must not be peroxidized, and a pore-preserving structure is required.

[0022] S4. The hard carbon billet enters the homogenization cooling section 2b of the graded cooling chamber. The PLC controller 41 sends a command to the homogenization cooling mechanism based on the temperature data collected by the electronic temperature sensor in the homogenization cooling section. The electronic flow regulating valve controls the chilled water flow rate of the heat exchange coil 61 to cool the hard carbon billet from 200-300℃ to 100-200℃ at a rate of 10-30℃ / min. The advantage of using the heat exchange coil 61 for secondary cooling is that the secondary cooling of the hard carbon billet ensures that the surface of the product will not change and affect the mechanical strength of the material.

[0023] S5. The hard carbon billet enters the slow cooling section 2c of the staged cooling chamber. The PLC controller sends a command to the slow cooling mechanism 7, and high-pressure nozzles spray pure water onto the hard carbon billet, controlling the temperature gradient of the slow cooling section at 5-10℃ / min, thus cooling the hard carbon billet to room temperature. The advantage of using high-pressure pure water injection for three-stage cooling is that the internal temperature of the hard carbon billet is fully released, ensuring that the product will not spontaneously combust in the presence of oxygen in the air. Pure water does not contain minerals, ensuring the quality of the sodium electrode hard carbon.

[0024] S6. After cooling is complete, the conveying mechanism will send the hard carbon finished product out from the discharge end of the grading cooling chamber.

[0025] Specifically, in step S3, the inert gas temperature is room temperature, the gas flow rate in the initial cooling section during the injection process is 0.5-2 m / s, and in step S4, the cooling water flow rate of the heat exchange coil 61 is 5-10 L / min, and the temperature fluctuation range in the cooling section does not exceed ±5℃.

[0026] Specifically, in steps S2, S3, and S4, the electronic temperature sensors corresponding to the initial cooling section 2a, the uniform cooling section 2b, and the slow cooling section 2c dynamically monitor the temperature data. When the temperature reaches the set value, the conveyor starts to move the hard carbon material forward, thereby passing the hard carbon material through the initial cooling section 2a, the uniform cooling section 2b, and the slow cooling section 2c in sequence, and completing the corresponding step-by-step cooling at the corresponding positions.

[0027] In summary, the advantages of using a three-stage cooling system—nitrogen, heat exchange coils, and pure water—for hard carbon materials are as follows: The hard carbon billet will not undergo over-oxidation at high temperatures in an inert gas environment. The surface of the sodium electrode anode material must not be over-oxidized, and its pore structure must be preserved. The secondary cooling of the hard carbon billet ensures that the product surface will not change, affecting the material's mechanical strength. The complete release of internal temperature from the hard carbon billet ensures that the product will not spontaneously combust in the presence of oxygen in the air.

[0028] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the protection scope of the present invention.

Claims

1. A device for rapid cooling during high-temperature carbonization of hard carbon materials, characterized in that: The system includes a high-temperature furnace body, a staged cooling chamber, a conveyor, and a temperature control system. The high-temperature furnace body contains heating components, where the hard carbon billet is heated and carbonized. The discharge end of the high-temperature furnace body is connected to the feed end of the staged cooling chamber. The conveyor runs through the staged cooling chamber, driving the hard carbon billet from the high-temperature furnace body into the staged cooling chamber and then out of the discharge end. The staged cooling chamber is sequentially divided into an initial cooling section, a uniform cooling section, and a slow cooling section according to the direction of the hard carbon billet's movement. The initial cooling section contains an initial cooling mechanism that cools the newly entered hard carbon billet once. The uniform cooling section contains a uniform cooling mechanism that cools the hard carbon billet a second time after the first cooling. The slow cooling section contains a slow cooling mechanism that cools the hard carbon billet a third time after the second cooling. The temperature control system controls the cooling temperatures of the initial cooling section, the uniform cooling section, and the slow cooling section.

2. The rapid cooling device for high-temperature carbonization of hard carbon materials according to claim 1, characterized in that: The staged cooling chamber is a circular barrel. The primary cooling mechanism consists of an inert gas container, a gas pipe, and multiple gas nozzles. The inert gas container is filled with inert gas and is connected to one end of the gas pipe. The gas pipe surrounds the interior of the staged cooling chamber, and multiple gas nozzles are installed on the side of the gas pipe, located in the primary cooling section. The equalization cooling mechanism consists of heat exchange coils, a first chilled water tank, a first high-pressure water pump, a first chiller, and multiple first water pipes. The heat exchange coils are installed around the equalization cooling section. The first high-pressure water pump drives chilled water in the first chilled water tank through the first water pipes. The water enters the inlet of the heat exchange coil, and the outlet of the heat exchange coil is connected to the first chiller via the first water pipe. The first chiller cools the chilled water discharged from the heat exchange coil to the set temperature and then discharges it back to the chilled water tank. The slow cooling mechanism includes a second chiller, a second chilled water tank, a second high-pressure water pump, a high-pressure nozzle, and multiple second water pipes. The second chiller drives the chilled pure water through the second water pipes to the second chilled water tank. The second high-pressure water pump drives the pure water in the second chilled water tank through the second water pipes to the high-pressure nozzle. The high-pressure nozzle is directed at the hard carbon material in the slow cooling section.

3. The rapid cooling device for high-temperature carbonization of hard carbon materials according to claim 2, characterized in that: The inert gas is nitrogen, and the outlet direction of the gas nozzle is at an angle of 30°-60° to the conveying direction of the hard carbon billet. The chilled water flowing in the heat exchange coil is low-temperature chilled water liquid at 1℃-5℃, and the distance between two adjacent tubes of the heat exchange coil is 5cm-15cm.

4. The rapid cooling device for high-temperature carbonization of hard carbon materials according to claim 2, characterized in that: The temperature control system includes a PLC controller, electronic temperature sensors, electronic flow regulating valves, and electronic pressure sensors. Electronic temperature sensors are installed in the initial cooling section, the uniform cooling section, and the slow cooling section to dynamically monitor the ambient temperature of each cooling section. Electronic flow regulating valves are installed in the air pipe, the first water pipe, and the second water pipe to dynamically adjust the cooling rate of each cooling section. Electronic pressure sensors are installed in the air pipe, the first water pipe, and the second water pipe to detect the pressure in each pipe. The electronic temperature sensors, electronic flow regulating valves, and electronic pressure sensors are electrically connected to the PLC controller.

5. The rapid cooling device for high-temperature carbonization of hard carbon materials according to claim 1, characterized in that: The conveyor is a belt conveyor using a high-temperature resistant conveyor belt.

6. A method for rapidly cooling down a hard carbon material after high-temperature carbonization using the apparatus described in any one of claims 1-5, characterized in that: Includes the following steps, S1. Place the hard carbon billet in a high-temperature furnace, heat the hard carbon billet to 500-800℃ and hold it at that temperature for 1-5 hours. S2. The conveyor drives the heat-insulated hard carbon billet to be transported to the staged cooling chamber at a rate of 1-20 m / min; S3. The hard carbon billet enters the primary cooling section of the staged cooling chamber. The PLC controller sends a command to the primary cooling mechanism based on the temperature data collected by the electronic temperature sensor in the primary cooling section. The primary cooling mechanism injects inert gas into the hard carbon billet at a pressure of 0.1-0.2MPa, cooling the hard carbon billet from 500-800℃ to 200-300℃ at a rate of 50-100℃ / min. S4. The hard carbon billet enters the cooling section of the graded cooling chamber. The PLC controller sends a command to the cooling mechanism based on the temperature data collected by the electronic temperature sensor in the cooling section. The electronic flow regulating valve controls the chilled water flow of the heat exchange coil to cool the hard carbon billet from 200-300℃ to 100-200℃ at a rate of 10-30℃ / min. S5. The hard carbon billet enters the slow cooling section of the graded cooling chamber. The PLC controller sends a command to the slow cooling mechanism, and the high-pressure nozzle sprays pure water onto the hard carbon billet, controlling the temperature gradient of the slow cooling section at 5-10℃ / min, so that the hard carbon billet is cooled to room temperature. S6. After cooling is complete, the conveying mechanism will send the hard carbon finished product out from the discharge end of the grading cooling chamber.

7. The method for rapid cooling of hard carbon materials after high-temperature carbonization according to claim 6, characterized in that: In step S3, the inert gas temperature is room temperature, and the gas flow velocity in the initial cooling section during the injection process is 0.5-2 m / s.

8. The method for rapid cooling of hard carbon materials after high-temperature carbonization according to claim 6, characterized in that: In step S4, the cooling water flow rate of the heat exchange coil is 5-10 L / min, and the temperature fluctuation range in the cooling zone does not exceed ±5℃.

9. The method for rapid cooling of hard carbon materials after high-temperature carbonization according to claim 6, characterized in that: In steps S2, S3, and S4, the electronic temperature sensors corresponding to the initial cooling section, the uniform cooling section, and the slow cooling section dynamically monitor the temperature data. When the temperature reaches the set value, the conveyor starts to move the hard carbon material forward.

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