Water-gas dual circulation cooling control system and method for continuous graphitization furnace

Abstract

The application discloses a water-gas double-circulation cooling control system and method of a continuous graphitization furnace, and the system comprises a cooling channel, a heat exchanger, a cooling tower, a circulating fan, upper and lower finned pipes and a PLC controller; the cooling channel, the heat exchanger and the circulating fan are connected through a main pipeline to form a gas circulation loop; the water outlet end of the cooling tower is divided into two paths, one path is connected to the upper and lower finned pipes through the heat exchanger, and the other path is directly connected to the lower finned pipe, thereby forming a water circulation loop; the PLC controller collects data of a multi-point infrared temperature measuring instrument, a temperature sensor and a flowmeter, calculates the temperature deviation degree of a boat, the temperature deviation degree of cooling water and the temperature deviation degree of circulating gas, and uniformly regulates the opening degree of a throttling valve and the rotating speed of the circulating fan through a feedback regulator, thereby forming a closed-loop cooperative control. The application adopts water-gas double-circulation cooperative cooling, combines multi-dimensional deviation solving and coupled PID unified regulation, improves the efficiency and stability of boat cooling, and guarantees the consistency and quality of graphitized products.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology for high-temperature purification equipment, and in particular to a water-air dual-circulation cooling control system and method for a continuous graphitization furnace. Background Technology

[0002] Graphitization is a crucial step in the heat treatment of carbon materials, widely used in the production of graphite electrodes and lithium-ion battery anode materials. The push-boat continuous graphitization furnace has been widely applied in this process. In this process, the boat containing the carbon raw material is first heated and held at high temperatures, where the material undergoes a crystal structure transformation. Subsequently, the boat (containing the internal graphite material) needs to be controlled to ensure the stability and consistency of the graphite's properties. Improper control of the cooling process can lead to thermal stress cracks, structural damage, or performance fluctuations within the material, affecting the quality of the final product.

[0003] In existing graphitization furnaces, the cooling methods for the material carrier boats are mostly natural cooling or fixed water cooling devices. For example, Chinese invention patent with publication number CN101788227A discloses an induction heating ultra-high temperature continuous carbonization furnace. In this carbonization furnace, the water cooling tunnel in the lower furnace body is the main cooling channel for the material carrier boat. It is a square cylinder with a jacket and water flow, which is the solid part of the horizontal channel.

[0004] Furthermore, the system only uses a water-cooled jacket structure to indirectly cool the material carrier boat. The cooling rate is difficult to dynamically adjust according to the actual temperature of the material. Especially in continuous production, due to the fluctuation of the output temperature of the material carrier boat and the uneven temperature distribution at different locations in the cooling channel, the use of fixed water cooling devices and a single cooling strategy often cannot meet the process requirements, which can easily lead to problems such as low cooling efficiency and poor product consistency.

[0005] Therefore, there is an urgent need for an intelligent cooling control scheme that integrates multi-point data acquisition, water-air dual-medium coordination, and multi-input coupled PID unified regulation to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a water-air dual-circulation cooling control system and method for a continuous graphitization furnace, which overcomes the deficiency of existing technologies in the lack of direct detection means of material state. By detecting air pressure, the stability of materials in the furnace can be judged in real time, and a coordinated control mechanism of temperature regulation, induction heating response and air pressure detection can be established. While maintaining the stability of the furnace temperature, the stability of the graphitization reaction of the material can be ensured, thereby improving the quality of graphitized products.

[0007] To achieve the above objectives, the present invention provides a water-air dual-circulation cooling control system for a continuous graphitization furnace, including a cooling channel, a heat exchanger, a cooling tower, a circulating fan, a lower finned tube, and an upper finned tube; the cooling channel includes an inlet, a middle section, and an outlet, and each of the inlet, the middle section, and the outlet is provided with a material-carrying vessel. The cooling channel, heat exchanger, and circulating fan are connected by a main pipeline. The outlet of the cooling tower is divided into a first path and a second path. The first path is connected to the heat exchanger via a first branch pipeline. The end of the first branch pipeline near the heat exchanger is connected to one end of the upper finned tube via the first pipeline. The other end of the upper finned tube returns the return water to the cooling tower via the second pipeline. The second path is connected to one end of the lower finned tube via the second branch pipeline. The other end of the lower finned tube returns the return water to the cooling tower via the third pipeline. The second pipeline is connected to the heat exchanger via a fourth pipeline.

[0008] Preferably, a first infrared thermometer is installed at the inlet, a second infrared thermometer is installed at the outlet, a third infrared thermometer is installed at the bottom of the middle section, and a fourth infrared thermometer is installed at the top of the middle section.

[0009] Preferably, a first temperature sensor and a first flow meter are installed on the side of the main pipeline near the heat exchanger inlet, and a second temperature sensor is installed on the side of the main pipeline near the heat exchanger outlet. A third temperature sensor is installed at the outlet of the cooling tower, and a fourth temperature sensor and a second flow meter are installed on the side of the third pipe away from the cooling tower. The second pipe is equipped with a fifth temperature sensor and a third flow meter on the side away from the cooling tower; the fourth pipe is equipped with a sixth temperature sensor and a fourth flow meter on the side closer to the heat exchanger.

[0010] Preferably, a first throttling valve is provided on the side of the second branch pipe near the lower finned tube; A second throttle valve is installed on the side of the first pipe near the upper finned tube; The first branch pipeline has a third throttle valve installed on the side closest to the heat exchanger.

[0011] Preferably, it also includes a PLC controller for collecting real-time data from each infrared thermometer, temperature sensor, and flow meter, and controlling the opening degree of each throttle valve and the speed of the circulating fan; the circulating fan uses variable frequency motor speed control to achieve stepless adjustment of the nitrogen flow rate.

[0012] This invention provides a water-gas dual-circulation cooling control method for a continuous graphitization furnace, comprising the following steps: S1. Collect real-time operating parameters from multiple points and transmit the collected data to the PLC controller. S2. Calculate the temperature deviation of the loading boat using the PLC controller; S3. Calculate the cooling water temperature deviation using the PLC controller; S4. Calculate the temperature deviation of the circulating gas using the PLC controller; S5, the PLC controller adjusts the value based on calculated feedback; S6. If the calculated deviations are: cargo boat temperature deviation, cooling water temperature deviation, and circulating gas temperature deviation... If all values ​​are less than the set threshold, the cooling is considered stable, and the current output is maintained; otherwise, return to S1 and continue the loop.

[0013] Preferably, in S2, the PLC controller obtains the temperature deviation of the carrier boat based on the temperatures collected by the first, second, third, and fourth infrared thermometers and the preset temperature and temperature deviation of the carrier boat. Specifically: A weighted average was calculated from multiple temperature measurement points located in the same area of ​​the cooling channel's inlet, middle, and outlet zones: ; in, The average temperature of the vessel; Measure the temperature of each vessel; Weights are assigned to each temperature. Recalculate the deviation: ; in, The preset temperature of the loading boat; Calculate the temperature deviation: ; in, This is the preset value for the temperature deviation of the material carrier boat.

[0014] Preferably, in S3, the PLC controller calculates the cooling water temperature deviation based on the average temperature collected by the third, fourth, and fifth temperature sensors, combined with the preset real-time cooling water temperature and the preset cooling water temperature deviation. ; in, This refers to the temperature difference deviation of the cooling water. For the real-time temperature difference of cooling water, The temperature measured by the third temperature sensor; The average return water temperature of the cooling water. These are the measured temperatures of the fourth and fifth temperature sensors, respectively.

[0015] Preferably, in step S4, the PLC controller calculates the circulating gas temperature deviation based on the temperatures collected by the first and second temperature sensors, combined with the preset real-time temperature value and the preset gas temperature deviation value. ; in, Preset value for gas temperature deviation; For gas temperature deviation, For the target gas temperature difference, This represents the real-time temperature difference of the gas.

[0016] Preferably, in S5, the PLC controller determines the deviation based on the deviation of the vessel temperature, the cooling water temperature deviation, and the circulating gas temperature deviation. The control quantity of each actuator is calculated and output using a feedback regulator; Among them, the cooling water temperature deviation Adjust the opening degrees of the first, second, and third throttle valves; based on the circulating gas temperature deviation... Adjust the speed of the circulating fan; adjust the temperature deviation of the vessel. As an auxiliary adjustment, correct the basic settings of each throttle valve and circulating fan; The feedback controller is a PID or MIMO controller, and its transfer function is: ; in, This is the proportionality coefficient; The integral coefficient; These are the differential coefficients; Calculate the control quantity of each actuator based on the transfer function: ; in, These are weighting coefficients, used to convert the output control quantity of the feedback regulator into the opening commands of the corresponding first throttle valve, second throttle valve, and third throttle valve, and the speed command of the circulating fan, respectively. is the coupling coefficient.

[0017] Therefore, the present invention employs the above-mentioned water-air dual-circulation cooling control system and method for a continuous graphitization furnace, and the beneficial effects are as follows: (1) This invention makes up for the lack of direct detection of material state in the prior art. It realizes real-time judgment of the stability of materials in the furnace through air pressure detection, and establishes a coordinated control mechanism of temperature regulation, induction heating response and air pressure detection. While maintaining the stability of the furnace temperature, it ensures the stability of the graphitization reaction of materials and improves the quality of graphitized products.

[0018] (2) This invention overcomes the shortcomings of low cooling efficiency and unstable product quality in the prior art. Based on the dual-circulation cooling system of nitrogen circulation cooling and water circulation cooling, the dynamic temperature of the material carrier in the cooling channel is judged in real time by multiple infrared temperature measurements.

[0019] (3) The present invention uses the gas pressure inside the furnace as the direct basis for judging the stability of the material, and reflects key parameters such as the material bulk density, volatile matter escape rate and void distribution in real time. It establishes a three-parameter coordinated control logic of "temperature-gas pressure-feeding and discharging speed" to achieve the mutual coordination of temperature regulation, feeding and discharging speed control and material status monitoring, so as to ensure temperature stability and the consistency of the material reaction environment, and improve product uniformity.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is an overall structural block diagram of an embodiment of a water-gas dual-circulation cooling control system for a continuous graphitization furnace according to the present invention; Figure 2 This is a flowchart of an embodiment of a water-air dual-circulation cooling control method for a continuous graphitization furnace according to the present invention.

[0022] Figure Labels 1. Material carrier boat; 2. First infrared thermometer; 3. Second infrared thermometer; 4. Third infrared thermometer; 5. Fourth infrared thermometer; 6. First temperature sensor; 7. First flow meter; 8. Second temperature sensor; 9. Fifth temperature sensor; 10. Third flow meter; 11. Fourth temperature sensor; 12. Second flow meter; 13. Sixth temperature sensor; 14. Fourth flow meter; 15. Third temperature sensor; 16. First throttle valve; 17. Second throttle valve; 18. Third throttle valve; 19. Circulating fan; 20. PLC controller; 21. Heat exchanger; 22. Cooling tower. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] like Figure 1 As shown, a water-air dual-circulation cooling control system for a continuous graphitization furnace includes a cooling channel, a heat exchanger 21, a cooling tower 22, a circulating fan 19, a lower finned tube, and an upper finned tube; the cooling channel includes an inlet, a middle section, and an outlet, and each of the inlet, middle section, and outlet is equipped with a material carrier 1.

[0026] The cooling channel, heat exchanger 21, and circulating fan 19 are connected by a main pipeline; the outlet of cooling tower 22 is divided into a first path and a second path. The first path is connected to heat exchanger 21 via a first branch pipeline. The end of the first branch pipeline near heat exchanger 21 is connected to one end of the upper finned tube via the first pipeline. The other end of the upper finned tube returns the return water to cooling tower 22 via the second pipeline. The second path is connected to one end of the lower finned tube via the second branch pipeline. The other end of the lower finned tube returns the return water to cooling tower 22 via the third pipeline. The second pipeline is connected to heat exchanger 21 via a fourth pipeline.

[0027] An infrared thermometer 2 is installed at the inlet to measure the temperature of the inlet-loaded vessel 1 within the cooling channel. A second infrared thermometer 3 is installed at the outlet to measure the temperature of the outlet-loaded vessel 1 within the cooling channel. A third infrared thermometer 4 is installed at the bottom of the middle section to measure the temperature of the bottom of the middle section-loaded vessel 1 within the cooling channel. A fourth infrared thermometer 5 is installed at the top of the middle section to measure the temperature of the top of the middle section-loaded vessel 1 within the cooling channel.

[0028] In this embodiment, a first temperature sensor 6 and a first flow meter 7 are installed on the side of the main pipeline near the air inlet of the heat exchanger 21. The first temperature sensor 6 is used to measure the air inlet temperature of the heat exchanger 21, and the first flow meter 7 is used to measure the air inlet flow rate of the heat exchanger 21. A second temperature sensor 8 is installed on the side of the main pipeline near the air outlet of the heat exchanger 21. The second temperature sensor 8 is used to measure the air outlet temperature of the heat exchanger 21.

[0029] A third temperature sensor 15 is installed at the outlet of the cooling tower 22 to measure the outlet water temperature of the cooling tower 22 (i.e., the inlet water temperature of the cooling system).

[0030] A fourth temperature sensor 11 and a second flow meter 12 are installed on the side of the third pipe away from the cooling tower 22; the fourth temperature sensor 11 is used to measure the return water temperature of the lower finned tube, and the second flow meter 12 is used to measure the return water flow of the lower finned tube.

[0031] A fifth temperature sensor 9 and a third flow meter 10 are installed on the side of the second pipe away from the cooling tower 22; the fifth temperature sensor 9 is used to measure the return water temperature of the upper finned tube, and the third flow meter 10 is used to measure the return water flow of the upper finned tube.

[0032] A sixth temperature sensor 13 and a fourth flow meter 14 are installed on the side of the fourth pipe near the heat exchanger 21. The sixth temperature sensor 13 is used to measure the outlet air temperature of the heat exchanger 21, and the fourth flow meter 14 is used to measure the return water flow rate of the heat exchanger 21.

[0033] In addition, in this embodiment, a first throttle valve 16 for adjusting the water inlet flow rate of the lower finned tube is provided on the side of the second branch pipe near the lower finned tube.

[0034] A second throttle valve 17 is provided on the side of the first pipe near the upper finned tube for adjusting the water inlet flow of the upper finned tube.

[0035] A third throttle valve 18 for adjusting the inlet flow rate of heat exchanger 21 is provided on the side of the first branch pipeline near heat exchanger 21.

[0036] This embodiment also includes a PLC controller 20 for collecting real-time data from various infrared thermometers, temperature sensors, and flow meters, and for controlling the opening degree of each throttle valve and the speed of the circulating fan 19. Simultaneously, the PLC controller 20 calculates and controls the opening degree of the first throttle valve 16, the second throttle valve 17, and the third throttle valve 18, as well as the speed of the circulating fan 19, based on the collected data. The circulating fan 19 uses a variable frequency motor speed control to achieve stepless adjustment of the nitrogen flow rate.

[0037] like Figure 2 As shown, a water-gas dual-circulation cooling control method for a continuous graphitization furnace includes the following steps: S1. Perform real-time acquisition of operating parameters at multiple points and transmit the acquired data to the PLC controller. Specifically: The data monitored in real time by the first infrared thermometer 2, the second infrared thermometer 3, the third infrared thermometer 4, the fourth infrared thermometer 5, the first temperature sensor 6, the second temperature sensor 8, the third temperature sensor 15, the fourth temperature sensor 11, the fifth temperature sensor 9, the sixth temperature sensor 13, the first flow meter 7, the second flow meter 12, the third flow meter 10, and the fourth flow meter 14 are transmitted to the PLC controller 20.

[0038] S2. Calculate the temperature deviation of the loading boat using the PLC controller. Specifically: The PLC controller 20 calculates the temperature deviation of the loading boat based on the temperatures collected by the first infrared thermometer 2, the second infrared thermometer 3, the third infrared thermometer 4, and the fourth infrared thermometer 5, along with the preset temperature value and the preset temperature deviation value of the loading boat. Specifically: A weighted average was calculated from multiple temperature measurement points located in the same area of ​​the cooling channel's inlet, middle, and outlet zones: ; in, The average temperature of the vessel; Measure the temperature of each vessel; Weights are assigned to each temperature. Recalculate the deviation: ; in, This is the preset temperature value for the material carrier boat.

[0039] Calculate temperature deviation: ; in, This is the preset value for the temperature deviation of the material carrier boat.

[0040] S3. Calculate the cooling water temperature deviation using the PLC controller. Specifically: The PLC controller 20 calculates the cooling water temperature deviation based on the average temperature collected by the third temperature sensor 15, the fourth temperature sensor 11, and the fifth temperature sensor 9, combined with the preset real-time cooling water temperature and the preset cooling water temperature deviation. ; in, This refers to the temperature difference deviation of the cooling water. For the real-time temperature difference of cooling water, The temperature measured by the third temperature sensor; The average return water temperature of the cooling water. These are the measured temperatures of the fourth and fifth temperature sensors, respectively.

[0041] S4. Calculate the temperature deviation of the circulating gas using the PLC controller.

[0042] The PLC controller 20 calculates the circulating gas temperature deviation based on the temperatures collected by the first temperature sensor 6 and the second temperature sensor 8, combined with the preset real-time temperature value and the preset gas temperature deviation value. ; in, Preset value for gas temperature deviation; For gas temperature deviation, For the target gas temperature difference, This represents the real-time temperature difference of the gas.

[0043] S5 and PLC controllers adjust values ​​based on calculated feedback, specifically: The PLC controller 20 calculates the deviation based on the deviation of the vessel temperature, cooling water temperature, and circulating gas temperature. The control quantity of each actuator is calculated and output using a feedback regulator.

[0044] Among them, the cooling water temperature deviation Adjust the opening degrees of the first throttle valve 16, the second throttle valve 17, and the third throttle valve 18; based on the circulating gas temperature deviation... Adjust the speed of the circulating fan; adjust the temperature deviation of the vessel. As an auxiliary adjustment, the basic settings of each throttle valve and circulating fan are corrected.

[0045] The feedback controller is a PID or MIMO controller, and its transfer function is: ; in, This is the proportionality coefficient; The integral coefficient; is the differential coefficient.

[0046] Calculate the control quantity of each actuator based on the transfer function: ; in, These are weighting coefficients and preset constants, used to convert the output control quantity of the feedback regulator into the opening command of the corresponding first throttle valve 16, second throttle valve 17, and third throttle valve 18 and the speed command of the circulating fan, respectively. The value range of each coefficient is 0.1~1.5. The coupling coefficient is adaptively adjustable.

[0047] S6. Stability Judgment and Loop: If the calculated temperature deviation of the loading vessel, cooling water temperature deviation, and circulating gas temperature deviation are... If all values ​​are less than the set threshold, the cooling is considered stable, and the current output is maintained; otherwise, return to S1 and continue the sampling-calculation-adjustment cycle to form a closed-loop control.

[0048] Therefore, the present invention adopts the above-mentioned water-air dual-circulation cooling control system and method for a continuous graphitization furnace. Through multi-point temperature flow data acquisition, multi-dimensional deviation calculation of water, air and boat, coupled PID unified control, and closed-loop collaborative control logic of throttle valve and variable frequency fan linkage execution, the opening degree of each cooling water valve and the speed of the circulating fan are corrected in a timely manner during the temperature adjustment process to ensure the efficiency and stability of the cooling of the material boat.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A water-gas dual-circulation cooling control system for a continuous graphitization furnace, characterized in that: It includes a cooling channel, heat exchanger, cooling tower, circulating fan, lower finned tube and upper finned tube; the cooling channel includes an inlet, middle section and outlet, and each of the inlet, middle section and outlet is equipped with a material carrier. The cooling channel, heat exchanger, and circulating fan are connected by a main pipeline. The outlet of the cooling tower is divided into a first path and a second path. The first path is connected to the heat exchanger via a first branch pipeline. The end of the first branch pipeline near the heat exchanger is connected to one end of the upper finned tube via the first pipeline. The other end of the upper finned tube returns the return water to the cooling tower via the second pipeline. The second path is connected to one end of the lower finned tube via the second branch pipeline. The other end of the lower finned tube returns the return water to the cooling tower via the third pipeline. The second pipeline is connected to the heat exchanger via a fourth pipeline.

2. The water-gas dual-circulation cooling control system for a continuous graphitization furnace according to claim 1, characterized in that: The inlet is equipped with a first infrared thermometer, the outlet with a second infrared thermometer, the bottom of the middle section with a third infrared thermometer, and the top of the middle section with a fourth infrared thermometer.

3. The water-gas dual-circulation cooling control system for a continuous graphitization furnace according to claim 1, characterized in that: A first temperature sensor and a first flow meter are installed on the side of the main pipeline near the heat exchanger inlet, and a second temperature sensor is installed on the side of the main pipeline near the heat exchanger outlet. A third temperature sensor is installed at the outlet of the cooling tower, and a fourth temperature sensor and a second flow meter are installed on the side of the third pipe away from the cooling tower. The second pipe is equipped with a fifth temperature sensor and a third flow meter on the side away from the cooling tower; the fourth pipe is equipped with a sixth temperature sensor and a fourth flow meter on the side closer to the heat exchanger.

4. The water-gas dual-circulation cooling control system for a continuous graphitization furnace according to claim 1, characterized in that: The second branch pipe is equipped with a first throttle valve on the side near the lower finned tube; A second throttle valve is installed on the side of the first pipe near the upper finned tube; The first branch pipeline has a third throttle valve installed on the side closest to the heat exchanger.

5. The water-gas dual-circulation cooling control system for a continuous graphitization furnace according to claim 1, characterized in that: It also includes a PLC controller for collecting real-time data from various infrared thermometers, temperature sensors, and flow meters, and for controlling the opening of various throttle valves and the speed of the circulating fan; the circulating fan uses variable frequency motor speed control to achieve stepless adjustment of the nitrogen flow rate.

6. A water-gas dual-circulation cooling control method for a continuous graphitization furnace, employing the system described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Collect real-time operating parameters from multiple points and transmit the collected data to the PLC controller. S2. Calculate the temperature deviation of the loading boat using the PLC controller; S3. Calculate the cooling water temperature deviation using the PLC controller; S4. Calculate the temperature deviation of the circulating gas using the PLC controller; S5, the PLC controller adjusts the value based on calculated feedback; S6. If the calculated deviations are: cargo boat temperature deviation, cooling water temperature deviation, and circulating gas temperature deviation... If all values ​​are less than the set threshold, the cooling is considered stable, and the current output is maintained; otherwise, return to S1 and continue the loop.

7. The water-gas dual-circulation cooling control method for a continuous graphitization furnace according to claim 6, characterized in that, In S2, the PLC controller calculates the temperature deviation of the loading boat based on the temperatures collected by the first, second, third, and fourth infrared thermometers, the preset temperature value of the loading boat, and the preset temperature deviation value of the loading boat. Specifically: A weighted average was calculated from multiple temperature measurement points located in the same area of ​​the cooling channel's inlet, middle, and outlet zones: ； in, The average temperature of the vessel; Measure the temperature of each vessel; Weights are assigned to each temperature. Recalculate the deviation: ； in, The preset temperature of the loading boat; Calculate temperature deviation: ； in, This is the preset value for the temperature deviation of the material carrier boat.

8. The water-gas dual-circulation cooling control method for a continuous graphitization furnace according to claim 7, characterized in that, In S3, the PLC controller calculates the cooling water temperature deviation based on the average temperature collected by the third, fourth, and fifth temperature sensors, combined with the preset real-time cooling water temperature and the preset cooling water temperature deviation. ； in, This refers to the temperature difference deviation of the cooling water. For the real-time temperature difference of cooling water, The temperature measured by the third temperature sensor; The average return water temperature of the cooling water. These are the measured temperatures of the fourth and fifth temperature sensors, respectively.

9. The water-gas dual-circulation cooling control method for a continuous graphitization furnace according to claim 8, characterized in that, In S4, the PLC controller calculates the circulating gas temperature deviation based on the temperatures collected by the first and second temperature sensors, combined with the preset real-time temperature and temperature deviation of the circulating gas. ； in, Preset value for gas temperature deviation; For gas temperature deviation, For the target gas temperature difference, This represents the real-time temperature difference of the gas.

10. The water-gas dual-circulation cooling control method for a continuous graphitization furnace according to claim 9, characterized in that, In S5, the PLC controller calculates the deviation based on the deviation of the water temperature, cooling water temperature, and circulating gas temperature. The control quantity of each actuator is calculated and output using a feedback regulator; Among them, the cooling water temperature deviation Adjust the opening degrees of the first, second, and third throttle valves; based on the circulating gas temperature deviation... Adjust the speed of the circulating fan; adjust the temperature deviation of the vessel. As an auxiliary adjustment, correct the basic settings of each throttle valve and circulating fan; The feedback controller is a PID or MIMO controller, and its transfer function is: ； in, This is the proportionality coefficient; The integral coefficient; These are the differential coefficients; Calculate the control quantity of each actuator based on the transfer function: ； in, These are weighting coefficients, used to convert the output control quantity of the feedback regulator into the opening commands of the corresponding first throttle valve, second throttle valve, and third throttle valve, and the speed command of the circulating fan, respectively. is the coupling coefficient.

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