Temperature control system and method for slow cooling section of silicon steel heat treatment furnace

Abstract

The invention relates to a temperature control system for a slow cooling section of a silicon steel heat treatment furnace, which comprises a control device and a furnace body, a silicon steel strip penetrates through the furnace body along the advancing direction of the silicon steel strip, an upper air duct is further arranged in the furnace body, and an upper air nozzle, a lower air nozzle, an upper air pipe and a lower air pipe are further arranged in the furnace body. The upper air duct and the lower air duct penetrate out of the furnace body in the width direction of the silicon steel strip and are communicated with the two sides, in the width direction of the silicon steel strip, of the upper air duct from the outer side, a circulating fan is further arranged in the furnace body, a temperature control device is further arranged in the upper air duct, a first control valve for controlling the ventilation quantity is further arranged in the upper air duct, and a second control valve for controlling the ventilation quantity is further arranged in the lower air duct. The multiple furnace bodies are evenly arranged in the advancing direction of the silicon steel strip, a plate temperature measuring device is further arranged at an outlet of any furnace body, and the control method is further included and adopts a PID algorithm to control the temperature. The method has the effects of improving the plate shape quality of the silicon steel strip and optimizing the grain structure.

Description

Technical Field

[0001] The present application relates to the technical field of heat treatment furnaces, and in particular to a temperature control system and method for a slow cooling section of a silicon steel heat treatment furnace. Background Art

[0002] Silicon steel, a key soft magnetic alloy material, is widely used in motors, transformers, new energy vehicles, and household appliances, and is a core material supporting the development of China's power and equipment manufacturing industries. With the advancement of the "dual carbon" strategy and the increasing demand for high-performance electrical equipment, the market demand for medium- and high-grade non-oriented silicon steel and high-magnetic-induction oriented silicon steel continues to grow, placing higher demands on their production processes.

[0003] In the manufacturing process of silicon steel, continuous annealing heat treatment is a key link in achieving the regulation of its magnetic and mechanical properties, especially the slow cooling section in the annealing furnace, which has a significant impact on the grain transformation, stress release and plate shape control of the steel strip. In the current design of annealing furnaces, the industry generally pays attention to the temperature control accuracy of the heating section, but the control means for the cooling section, especially the slow cooling process between 850°C and 650°C, are insufficient. Existing technologies usually use simple heat exchanger cooling or rough air volume adjustment to control temperature drop. There is a lack of high-precision, adjustable longitudinal and transverse temperature uniformity control systems, resulting in large temperature differences in the transmission direction and width direction of the strip, which in turn affects the plate shape consistency and grain structure stability. For example, the temperature difference in the width direction can generally reach ±20°C. In severe cases, it will cause defects such as edge waves, affecting the final performance of the product.

[0004] Therefore, there is an urgent need for a system and method that can achieve precise temperature control of the silicon steel strip in the transmission direction and width direction during the slow cooling section, so as to improve the plate quality and optimize the grain structure, thereby meeting the technical requirements of high-end silicon steel products. Summary of the Invention

[0005] In order to improve the plate quality of silicon steel strip and optimize the grain structure, thereby meeting the technical requirements of high-end silicon steel products, the present application provides a temperature control system and method for the slow cooling section of a silicon steel heat treatment furnace.

[0006] The present application provides a temperature control system and method for the slow cooling section of a silicon steel heat treatment furnace, which adopts the following technical solutions: A temperature control system for a slow cooling section of a silicon steel heat treatment furnace, comprising a control device and a furnace body arranged in the slow cooling section, wherein the silicon steel strip passes through the furnace body in its forward direction, an upper air duct is further arranged in the furnace body, the upper air duct is located at the top of the furnace body, the upper air duct is connected to the interior of the furnace body on both sides along the forward direction of the silicon steel strip, an upper air nozzle and a lower air nozzle are further respectively arranged on both sides in the thickness direction of the silicon steel strip, the upper side of the upper air nozzle is connected to an upper air duct, the lower side of the lower air nozzle is connected to a lower air duct, the upper air duct and the lower air duct respectively pass through the furnace body in the width direction of the silicon steel strip, and are respectively connected from the outside to the upper air duct along the silicon steel strip. On both sides of the width direction, the furnace body is further provided with a circulation fan, the circulation fan is arranged at the connection of the upper air duct, the upper air duct and the lower air duct, the circulation fan is electrically connected to the control device, the upper air duct is further provided with a temperature control device, the upper air duct is further provided with a control valve 1 for controlling the ventilation volume, the control valve 1 is electrically connected to the control device, the furnace body is evenly arranged with multiple ones along the forward direction of the silicon steel strip, and any outlet of the furnace body along the forward direction of the silicon steel strip is further provided with a plate temperature measuring device for detecting the temperature of the silicon steel strip in the width direction at the furnace body outlet, and the plate temperature measuring device is electrically connected to the control device.

[0007] By adopting the above technical solution, the system forms a closed-loop ventilation path through the upper air duct, upper and lower air nozzles and connected air ducts in conjunction with the circulating fan, and cooperates with the feedback of the plate temperature measuring device to make the temperature distribution inside the strip in the slow cooling section more uniform, realize precise control of the temperature in the transmission direction, and ensure the annealing cooling quality.

[0008] Preferably, partitions are provided in the upper air nozzle and the upper air duct, and in the lower air nozzle and the lower air duct respectively, and a plurality of partitions are provided at intervals in the width direction of the silicon steel strip. The plurality of partitions separate the upper air nozzle and the upper air duct or the lower air nozzle and the lower air duct into a plurality of corresponding air supply channels, and a control valve 2 is provided in any of the air supply channels, and any of the control valves 2 is electrically connected to the control device.

[0009] By adopting the above technical solution, the partition separates the air nozzle and the air duct into multiple air supply channels, and independent adjustment is achieved through control valve 2, so that the system can accurately adjust the air volume in each area according to the temperature feedback in the width direction of the strip, thereby improving the flexibility and uniformity of horizontal temperature control.

[0010] Preferably, the relative position of any of the partitions in the corresponding upper air nozzle and upper air duct or lower air nozzle and lower air duct is set corresponding to the width or process of the silicon steel strip.

[0011] By adopting the above technical solution, the position of the partition is arranged according to the width of the strip or the process characteristics, making the partitioning of the air supply channel more targeted, helping to achieve the adaptability and response speed of the horizontal temperature control of products of multiple specifications and improve the cooling consistency.

[0012] Preferably, the temperature control device includes an electric heater and a heat exchanger respectively arranged on both sides of the upper air duct along the forward direction of the silicon steel strip, and the control valve includes a heating control valve arranged on one side of the electric heater along the forward direction of the silicon steel strip and a cooling control valve arranged on one side of the water-cooled heat exchanger along the forward direction of the silicon steel strip.

[0013] By adopting the above technical solution, by arranging the electric heater and heat exchanger on both sides of the upper air duct respectively, and setting up a heating control valve and a cooling control valve, two-way fine regulation of the gas temperature can be achieved, thereby effectively controlling the gas heat exchange intensity and stabilizing the cooling rate of the strip.

[0014] Preferably, any one of the control valves 1 and 2 is provided with an on-site mechanical position indicator.

[0015] By adopting the above technical solution, the on-site mechanical position indicator can intuitively reflect the current opening status of the control valve. Even when the electronic control is abnormal, the operator can manually judge the adjustment position, thereby improving the on-site maintainability and operational safety of the system.

[0016] Preferably, pressure sensors are respectively provided in the upper air nozzle and the lower air nozzle, and at least two pressure sensors are provided in any air supply channel, and any of the pressure sensors is electrically connected to the control device.

[0017] By adopting the above technical solution, multiple pressure sensors are used to monitor the airflow distribution status in real time, and the data is fed back to the control device for air pressure adjustment, which helps to accurately grasp the uniformity of nozzle air output and avoid temperature fluctuations caused by uneven local air volume.

[0018] Preferably, the plate temperature measuring device is configured as a scanning plate thermometer, and the scanning plate thermometer is electrically connected to the control device.

[0019] By adopting the above technical solution, the scanning plate thermometer performs real-time temperature measurement at multiple points along the width of the silicon steel strip, ensuring that the temperature of each air supply channel area can be independently monitored and fed back to the control device, providing basic data support for horizontal PID control.

[0020] Preferably, the circulation fan is configured as a variable frequency fan.

[0021] By adopting the above technical solution, the variable frequency fan can realize dynamic adjustment of wind speed and air volume. Combined with the PID control strategy, the system can flexibly control the airflow intensity according to the cooling demand, thereby achieving refined control of the strip cooling rate.

[0022] Preferably, the control device is configured as a PLC integrated module, which includes a processor and an HMI human-machine interface. The HMI human-machine interface is configured to connect and interact with the processor, and the processor receives signals output by each actuator, processes and outputs control signals.

[0023] By adopting the above technical solution, the PLC integrated module is used as the control core, and the HMI human-machine interface is used for interactive settings and status feedback, which improves the intelligence level of system control and the efficiency of parameter adjustment, and is conducive to the realization of real-time online optimization of the process.

[0024] A temperature control method for a slow cooling section of a silicon steel heat treatment furnace adopts a temperature control system for the slow cooling section of a silicon steel heat treatment furnace according to any one of claims 2 to 8, comprising: a control device adopting a PID algorithm for temperature control: S1: setting a target temperature of the strip at each measuring point in the slow cooling section according to process requirements, including a target cooling rate along the forward direction of the silicon steel strip and a temperature target value of each air supply channel along the width direction of the silicon steel strip; S2: using a plurality of plate temperature monitoring devices to monitor the real-time temperature data of a plurality of positions in the width direction of the silicon steel strip at the corresponding furnace body outlet in real time to form a feedback signal; S3: the system compares the target temperature with the feedback temperature and calculates the deviation value of each control area; S4: performing a PID operation along the forward direction of the silicon steel strip and a PID operation along the width direction of the silicon steel strip; including a proportional term (P) directly calculating a proportional control amount according to the size of the deviation value of S3; an integral term (I) integrating the deviation value to obtain a proportional control amount; Eliminate long-standing deviations and calculate the integral control quantity; differential term (D): predict the changing trend of the deviation value and calculate the differential control quantity; S5: perform weighted summation on the three control quantities of proportion, integral and differential to obtain the final control quantity; S6: Based on the final control quantity, for temperature control along the forward direction of the silicon steel strip: by adjusting the speed of the circulating fan and the working state of the temperature control device, the overall cooling rate can be finely controlled; for temperature control along the width direction of the silicon steel strip: by adjusting control valve 1 and control valve 2, the ventilation volume is adjusted according to the feedback temperature of the silicon steel strip corresponding to each air supply channel, so as to realize independent control of the temperature drop in the width direction of the silicon steel strip; S7: The control process is carried out continuously, and by continuously correcting the deviation and adjusting the circulating fan, temperature control device, control valve 1 and control valve 2 in different furnace bodies, the system can be operated stably, so that the temperature of the silicon steel strip in the forward direction and width direction is kept within the set range.

[0025] By adopting the above technical solution and a control method based on the PID algorithm, temperature error feedback adjustment is performed in the forward direction and width direction of the silicon steel strip respectively. Through multi-point closed-loop control, the temperature of the strip cooling process can be accurately controlled to ensure the stability of the plate shape and the consistency of the grains.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By introducing an upper and lower air nozzle structure, multiple air supply channel division, a scanning plate temperature meter, and a multi-point PID control strategy in the slow cooling section, precise closed-loop control of the temperature of the silicon steel strip in the forward and width directions is achieved. This significantly improves the temperature consistency of the cooling process and effectively reduces thermal stress fluctuations and structural distortion. 2. The system integrates a PLC controller, an HMI human-machine interface, a variable frequency fan, a bidirectional temperature control unit, and a multi-stage regulating valve. By flexibly adjusting air volume and temperature, it achieves rapid response and stable control of cooling rates under different product specifications and process windows, thereby improving the adaptability and intelligence of the equipment. 3. Thanks to the collaborative design of multi-zone independent air supply control, scanning temperature monitoring and local air duct adjustment, this system can operate stably within a lateral temperature range of ±1°C, effectively controlling the plate consistency and grain evolution process of silicon steel, thereby significantly improving the electromagnetic properties of silicon steel strip and the quality of end products. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view mainly showing the internal structure of any furnace body in the embodiment of the present application; Figure 2 It is a left view mainly showing the internal structure of any furnace body in the embodiments of the present application.

[0028] Figure numerals: 1. furnace body; 11. upper air duct; 2. circulation fan; 3. upper air nozzle; 31. upper air duct; 4. lower air nozzle; 41. lower air duct; 5. partition; 6. air supply channel; 61. control valve 2; 7. electric heater; 71. heating control valve; 8. water-cooled heat exchanger; 81. cooling control valve. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-2 This application is described in further detail.

[0030] The embodiments of the present application disclose a temperature control system and method for a slow cooling section of a silicon steel heat treatment furnace.

[0031] See also Figure 1-Figure 2The temperature control system of the slow cooling section of the silicon steel heat treatment furnace includes a control device and a furnace body 1 arranged in the slow cooling section. The silicon steel strip passes through the furnace body 1 along its forward direction. The furnace body 1 is filled with a protective process gas. An upper air duct 11 is also provided in the furnace body 1. The upper air duct 11 is located at the top of the furnace body 1. The upper air duct 11 is connected to the interior of the furnace body 1 on both sides along the forward direction of the silicon steel strip. An upper air nozzle 3 and a lower air nozzle 4 are also provided on both sides of the thickness direction of the silicon steel strip. The upper side of the upper air nozzle 3 is connected to an upper air duct 31, and the lower side of the lower air nozzle 4 is connected to a lower air duct 41. The upper air duct 31 and the lower air duct 41 pass through the furnace body 1 along the width direction of the silicon steel strip respectively, and are connected to both sides of the upper air duct 11 along the width direction of the silicon steel strip from the outside. Partitions 5 are provided within the upper nozzle 3 and upper duct 31, and within the lower nozzle 4 and lower duct 41, respectively. Multiple partitions 5 are spaced apart across the width of the silicon steel strip. The relative position of any partition 5 within the corresponding upper nozzle 3 and upper duct 31, or lower nozzle 4 and lower duct 41, corresponds to the width or process of the silicon steel strip. Multiple partitions 5 separate the upper nozzle 3 and upper duct 31, or the lower nozzle 4 and lower duct 41, into multiple corresponding air supply channels 6. Each air supply channel 6 is provided with a second control valve 61, which is electrically connected to a control device. In this embodiment, four partitions 5 are provided, forming five air supply channels 6 within the corresponding upper nozzle 3 and upper duct 31, and the lower nozzle 4 and lower duct 41.

[0032] At least two pressure sensors are provided in any air supply channel 6. The two pressure sensors are respectively provided at the outlets of the corresponding upper air nozzle 3 or lower air nozzle 4 in the corresponding air supply channel 6. Any of the pressure sensors is electrically connected to the control device.

[0033] The furnace body 1 is also equipped with a circulating fan 2, a variable-frequency fan. It is located at the junction of the upper air duct 11, the upper air pipe 31, and the lower air pipe 41. It is connected to the control device via telecommunications. The upper air duct 11 is also equipped with a temperature control device, including a control valve 1 for controlling the ventilation volume. The temperature control device includes an electric heater 7 and a heat exchanger, respectively, located on either side of the upper air duct 11 along the direction of the silicon steel strip. Control valve 1 includes a heating control valve 71, located on the side of the electric heater 7 along the direction of the silicon steel strip, and a cooling control valve 81, located on the side of the water-cooled heat exchanger 8 along the direction of the silicon steel strip. Either heating control valve 71 or cooling control valve 81 is connected to the control device via telecommunications. Both control valve 1 and control valve 2 61 are configured as automatic flap regulating valves, each equipped with a local mechanical position indicator.

[0034] Multiple furnace bodies 1 are evenly arranged along the silicon steel strip's forward direction. In this embodiment, seven are provided. The outlet of each adjacent furnace body 1 along the strip's forward direction is correspondingly connected to the inlet of the next furnace body 1. Each outlet along the strip's forward direction is also equipped with a plate temperature measuring device for detecting the temperature of the silicon steel strip across its width at the furnace body 1 outlet. This plate temperature measuring device is a scanning plate thermometer, which is electrically connected to the control device. Control valve 2 61 is automatically adjusted by the control device based on the actual measured temperature of each air supply duct 6.

[0035] The control device is configured as a PLC integrated module, which includes a processor and an HMI (human-machine interface). The HMI is configured to interface with the processor, which receives signals from the actuators, processes them, and outputs control signals. The HMI can be used to set target temperatures, view real-time data, and manually adjust the valve openings of control valves 1 and 2 61.

[0036] The control method of the temperature control system of the slow cooling section of the silicon steel heat treatment furnace is as follows: the control device adopts PID algorithm to control the temperature: S1: setting the target temperature of each measuring point in the slow cooling section of the strip according to the process requirements, including the target cooling rate along the forward direction of the silicon steel strip and the temperature target value of each air supply channel 6 along the width direction of the silicon steel strip; S2: multiple plate temperature monitoring devices monitor the real-time temperature data of multiple positions in the width direction of the silicon steel strip at the outlet of the furnace body 1 in real time to generate feedback signals; S3: The system compares the target temperature with the feedback temperature and calculates the deviation value of each control area; S4: Perform PID calculations along the forward direction of the silicon steel strip and along the width direction of the silicon steel strip; including a proportional term (P) that directly calculates the proportional control amount according to the size of the deviation value in S3; an integral term (I) that integrates the deviation value to eliminate the deviation that exists for a long time and calculates the integral control amount; a differential term (D) that predicts the change trend of the deviation value and calculates the differential control amount; S5: Perform weighted summation of the three control variables of proportion, integration and differentiation to obtain the final control variable; S6: Based on the final control quantity, for temperature control along the forward direction of the silicon steel strip: by adjusting the speed of the circulating fan 2 and the working state of the temperature control device, fine control of the overall cooling rate is achieved; for temperature control along the width direction of the silicon steel strip: by adjusting the control valve 1 and the control valve 2 61, the ventilation volume is adjusted according to the feedback temperature of the silicon steel strip and the wind pressure feedback from the corresponding pressure sensor in each air supply channel 6, thereby achieving independent control of the temperature drop across the width direction of the silicon steel strip; S7: The control process is continuously carried out, and the system is stably operated by continuously correcting the deviation and adjusting the circulating fan 2, temperature control device, heating control valve 71, cooling control valve 81 and multiple control valves 61 in different furnace bodies 1, so that the temperature of the silicon steel strip is kept within the set range in the forward direction and width direction. The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A temperature control system for a slow cooling section of a silicon steel heat treatment furnace, characterized by: The invention comprises a control device and a furnace body (1) arranged in a slow cooling section, wherein the silicon steel strip passes through the furnace body (1) along its forward direction, and an upper air duct (11) is further arranged in the furnace body (1), wherein the upper air duct (11) is located at the top of the furnace body (1), and the upper air duct (11) is connected to the interior of the furnace body (1) on both sides along the forward direction of the silicon steel strip, and an upper air nozzle (3) and a lower air nozzle (4) are respectively arranged on both sides in the thickness direction of the silicon steel strip, wherein the upper side of the upper air nozzle (3) is connected to an upper air duct (31), and the lower side of the lower air nozzle (4) is connected to a lower air duct (41), wherein the upper air duct (31) and the lower air duct (41) respectively pass through the furnace body (1) along the width direction of the silicon steel strip, and are respectively connected from the outside to the upper air duct (11) along the width direction of the silicon steel strip. On both sides of the width direction, the furnace body (1) is further provided with a circulation fan (2), the circulation fan (2) is provided at the connection of the upper air duct (11), the upper air pipe (31) and the lower air pipe (41), the circulation fan (2) is connected to the control device by telecommunication, the upper air duct (11) is further provided with a temperature control device, the upper air duct (11) is further provided with a control valve 1 for controlling the ventilation volume, the control valve 1 is connected to the control device by telecommunication, the furnace body (1) is uniformly arranged with a plurality of the silicon steel strips in the forward direction, and a plate temperature measuring device for detecting the temperature of the silicon steel strips in the width direction at the furnace body (1) outlet is further provided at any outlet of the furnace body (1) in the forward direction of the silicon steel strip, and the plate temperature measuring device is connected to the control device by telecommunication.

2. The temperature control system of the slow cooling section of a silicon steel heat treatment furnace according to claim 1, characterized in that: The upper air nozzle (3) and the upper air duct (31), the lower air nozzle (4) and the lower air duct (41) are respectively provided with partitions (5), and a plurality of the partitions (5) are provided at intervals in the width direction of the silicon steel strip. The plurality of partitions (5) separate the upper air nozzle (3) and the upper air duct (31) or the lower air nozzle (4) and the lower air duct (41) into a plurality of corresponding air supply channels (6). A control valve 2 (61) is provided in any of the air supply channels (6), and any of the control valves 2 (61) is electrically connected to the control device.

3. The temperature control system of the slow cooling section of a silicon steel heat treatment furnace according to claim 2, characterized in that: The relative position of any of the partitions (5) in the corresponding upper air nozzle (3) and upper air duct (31) or lower air nozzle (4) and lower air duct (41) is set corresponding to the width or process of the silicon steel strip.

4. The temperature control system of the slow cooling section of a silicon steel heat treatment furnace according to claim 1, characterized in that: The temperature control device comprises an electric heater (7) and a heat exchanger respectively arranged on both sides of the upper air duct (11) along the advancing direction of the silicon steel strip, and the control valve 1 comprises a heating control valve (71) arranged on one side of the electric heater (7) along the advancing direction of the silicon steel strip and a cooling control valve (81) arranged on one side of the water-cooled heat exchanger (8) along the advancing direction of the silicon steel strip.

5. The temperature control system of the slow cooling section of a silicon steel heat treatment furnace according to claim 2, characterized in that: Any of the control valves 1 and 2 (61) is provided with an on-site mechanical position indicator.

6. The temperature control system of the slow cooling section of a silicon steel heat treatment furnace according to claim 2, characterized in that: Pressure sensors are respectively provided in the upper air nozzle (3) and the lower air nozzle (4), and at least two pressure sensors are provided in each air supply channel (6). Any of the pressure sensors is electrically connected to the control device.

7. The temperature control system of the slow cooling section of a silicon steel heat treatment furnace according to claim 1, characterized in that: The board temperature measuring device is configured as a scanning board thermometer, and the scanning board thermometer is electrically connected to the control device.

8. The temperature control system of the slow cooling section of a silicon steel heat treatment furnace according to claim 1, characterized in that: The circulating fan (2) is configured as a variable frequency fan.

9. The temperature control system of the slow cooling section of a silicon steel heat treatment furnace according to claim 1, characterized in that: The control device is configured as a PLC integrated module, which includes a processor and an HMI human-machine interface. The HMI human-machine interface is configured to connect and interact with the processor, and the processor receives signals output by each actuator, processes them, and outputs control signals.

10. A temperature control method for a slow cooling section of a silicon steel heat treatment furnace, characterized in that: A temperature control system for a slow cooling section of a silicon steel heat treatment furnace according to any one of claims 2 to 8 comprises: a control device using a PID algorithm to control temperature: S1: setting the target temperature of each measuring point in the slow cooling section of the strip according to the process requirements, including the target cooling rate along the forward direction of the silicon steel strip and the temperature target value of each air supply channel (6) along the width direction of the silicon steel strip; S2: using multiple plate temperature monitoring devices to monitor the real-time temperature data of multiple positions in the width direction of the silicon steel strip at the outlet of the corresponding furnace body (1) in real time to form a feedback signal; S3: The system compares the target temperature with the feedback temperature and calculates the deviation value of each control area; S4: Perform PID calculations along the forward direction of the silicon steel strip and along the width direction of the silicon steel strip; including a proportional term (P) that directly calculates the proportional control amount according to the size of the deviation value in S3; an integral term (I) that integrates the deviation value to eliminate the deviation that exists for a long time and calculates the integral control amount; a differential term (D) that predicts the change trend of the deviation value and calculates the differential control amount; S5: Perform weighted summation of the three control variables of proportion, integration and differentiation to obtain the final control variable; S6: Based on the final control quantity, for temperature control along the forward direction of the silicon steel strip: by adjusting the rotation speed of the circulating fan (2) and the working state of the temperature control device, fine control of the overall cooling rate is achieved; for temperature control along the width direction of the silicon steel strip: by adjusting the control valve 1 and the control valve 2 (61), the ventilation volume is adjusted according to the feedback temperature of each air supply channel (6) corresponding to the silicon steel strip, so as to achieve independent control of the temperature drop in the width direction of the silicon steel strip; S7: The control process is continued, and the system is operated stably by continuously correcting the deviation and adjusting the circulating fans (2), temperature control devices, control valve 1 and control valve 2 (61) in different furnace bodies (1), so that the temperature of the silicon steel strip is kept within the set range in the forward direction and the width direction.

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