Pilot-scale simulation coiling furnace

Abstract

The invention relates to a pilot-scale simulation coiling furnace. The pilot-scale simulation coiling furnace comprises a furnace body, a stirring fan system, an electric exhaust fan system, a water cooling system, an intelligent control unit and a detection unit, and the intelligent control unit takes an intelligent digital regulator as a core and adopts a PID (Proportion Integration Differentiation) self-tuning algorithm to realize accurate control of the furnace temperature, so that a rolled piece can be stably cooled at a settable average rate of 0.2-1.0 DEG C / min in a range of 100-900 DEG C. And the water cooling system cools a motor and a bearing of the stirring fan system through circulating cooling water, so that the service life of equipment is effectively prolonged. The industrial coiling cooling working condition can be accurately simulated, the reliability and reproducibility of experimental data are improved, the automation degree is high, operation is stable, and a powerful platform support is provided for optimization of a pilot plant test material cooling process.

Description

Technical Field

[0001] This patent application belongs to the field of heat treatment equipment and control technology for metallic materials, and more specifically, it relates to a pilot-scale simulated coiling furnace. Background Technology

[0002] In the field of metal processing, especially in the production of hot-rolled strip steel, the cooling process after coiling is a crucial step in determining the final product's microstructure and properties (such as strength, toughness, and formability). Actual production lines are large-scale, operate under complex conditions, and are costly to conduct experiments, making it difficult to flexibly study the impact of different cooling paths on the evolution of the material's microstructure.

[0003] Therefore, developing a simulated coiling furnace that can precisely control temperature and cooling rate and ensure reliable operation of key components is of great significance for the research and optimization of metal material cooling processes. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pilot-scale simulated coiling furnace that can achieve precise temperature control and stable adjustment of cooling rate, and has long service life of key components and stable and reliable operation.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: A pilot-scale simulated coiling furnace includes a furnace body, a stirring fan system, an electric exhaust fan system, a water cooling system, an intelligent control unit, and a detection unit; The furnace body has a furnace chamber inside, which is used to accommodate the rolled pieces and provide a cooling simulation environment. Heating silicon carbide rods are installed on both sides of the furnace chamber. The stirring fan system is installed at the bottom rear side of the furnace body and is used to stir the air in the furnace to ensure uniform temperature. The electric exhaust fan system is installed at the exhaust port on the top of the furnace body and is used to regulate the air volume in the furnace chamber. The water cooling system is connected to the mixing fan system and is used to cool the motor and bearings of the mixing fan system. The detection unit is connected to the water cooling system and the furnace body, and is used to detect parameters such as the temperature inside the furnace, the current and voltage of the main circuit, and the water outlet temperature of the water cooling system. The intelligent control unit is connected to the mixing fan system, the electric exhaust fan system, the water cooling system, and the detection unit, respectively, and is used to receive signals from the detection unit and control the operation of each system according to a preset strategy.

[0006] Furthermore, the intelligent control unit includes an intelligent digital regulator and a power controller connected to each other. The intelligent digital regulator receives the furnace temperature signal from the detection unit, compares the received furnace temperature signal with the set temperature value, and controls the output of the power controller to control the furnace temperature.

[0007] Furthermore, the intelligent digital controller is a PID self-tuning controller. This PID self-tuning controller uses a PID self-tuning algorithm, which can automatically calculate the optimal PID parameters according to the characteristics of the controlled object, so as to improve the temperature control accuracy.

[0008] Furthermore, the electric exhaust fan system includes a frequency converter, a motor, and an exhaust fan connected in sequence. The frequency converter is connected to the intelligent digital regulator of the intelligent control unit. The frequency converter receives control signals and converts them into motor speed signals. The motor receives the motor speed signals and drives the exhaust fan to operate. The insulation class of the motor is ≥F.

[0009] Furthermore, the intelligent digital regulator has a program control function, which can automatically calculate the cooling rate according to the set target temperature and time, and through closed-loop control, control the speed of the exhaust fan to make the furnace temperature drop at a set rate, with a cooling rate range of 0.2-1.0℃ / min.

[0010] Furthermore, the water cooling system includes a chiller, a first water temperature sensor, and a circulating water pump. The first water temperature sensor is located at the cooling water pipe of the chiller. The chiller, the first water temperature sensor, and the circulating water pump are all connected to the intelligent control unit. The first water temperature sensor detects the outlet temperature of the cooling water of the chiller and transmits the signal to the intelligent control unit. When the outlet water temperature is higher than 30°C, the intelligent control unit controls the chiller to increase the cooling force and increases the circulating water flow rate through the circulating water pump.

[0011] Furthermore, the detection unit includes a temperature sensor, a current transformer, a voltage transformer, and a second water temperature sensor. The temperature sensor is located inside the furnace and is used to detect the temperature inside the furnace. The current transformer and the voltage transformer are used to detect the main circuit current and voltage of the furnace body. The second water temperature sensor is located at the cooling water pipe of the chiller and is connected to the water cooling system. It is used to detect the outlet water temperature of the water cooling system. When the outlet water temperature is higher than 30°C, the intelligent control unit controls the chiller to increase the cooling force and increases the circulating water flow rate through the circulating water pump.

[0012] Furthermore, the temperature control range of the furnace is 100℃-900℃, and the temperature control accuracy is within ±2℃.

[0013] Due to the adoption of the above technical solution, the beneficial effects achieved by this invention are: 1. This invention achieves precise control of furnace temperature by setting up an intelligent control unit, with an intelligent digital regulator as the core and combined with a PID self-tuning algorithm. The temperature control accuracy is within ±2℃, which can provide a stable temperature environment for the simulation of rolling mill cooling and improve the reliability of experimental data.

[0014] 2. The intelligent digital regulator has a program control function, which can accurately control the cooling rate within the range of 0.2-1.0℃ / min. It can accurately simulate the actual cooling process after industrial winding and meet the research needs of different cooling processes.

[0015] 3. The water cooling system effectively cools the motor and bearings of the mixing blower system, preventing damage from high temperatures inside the furnace through heat conduction and radiation. This significantly extends the service life of the equipment, improves the stability of equipment operation, and reduces maintenance costs.

[0016] 4. The electric exhaust fan system is controlled by a frequency converter, which can achieve precise adjustment of the exhaust volume, assist the cooling process, and further ensure the stability of the cooling rate.

[0017] 5. The detection unit can detect various parameters in real time and transmit them to the intelligent control unit, which facilitates operators to monitor the system's operating status and provides a basis for the intelligent control unit's regulation, making the system operation more intelligent.

[0018] 6. This invention can accurately simulate industrial winding and cooling conditions, improve the reliability and reproducibility of experimental data, and has a high degree of automation and stable operation, providing strong platform support for the optimization of pilot-scale material cooling processes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection structure of the present invention.

[0020] Figure 2 This is a connection block diagram of the present invention.

[0021] The components include: furnace body 1, stirring fan system 2, electric exhaust fan system 3, water cooling system 4, intelligent control unit 5, and detection unit 6. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the embodiments.

[0023] A pilot-scale simulated coiling furnace, such as Figure 1 , Figure 2 It includes furnace body 1, stirring fan system 2, electric exhaust fan system 3, water cooling system 4, intelligent control unit 5, and detection unit 6.

[0024] The furnace body 1 forms a furnace chamber with a temperature control range of 100-900℃, which is used to accommodate rolled parts and provide a cooling simulation environment.

[0025] The stirring fan system 2 is installed at the bottom rear side of the furnace body 1 and is connected to the water-cooled motor bearing outside the furnace through a drive shaft. It is used to stir the air inside the furnace to ensure uniform temperature.

[0026] An electric exhaust fan system 3 is installed at the exhaust vent at the top of the furnace body 1, and includes a frequency converter and a dedicated frequency converter motor. The frequency converter is connected to the intelligent control unit 5, receives control signals and converts them into motor speed signals. After receiving the motor speed signals, the motor drives the exhaust fan to operate. The exhaust fan is located at the exhaust vent at the top of the furnace body 1. The motor insulation class is ≥F, and it is used to adjust the amount of air exhausted from the furnace.

[0027] Water cooling system 4 is connected to agitator fan system 2. Water cooling system 4 includes a circulating water cooling system, which comprises a chiller, a circulating water pump, and a first water temperature sensor. The first water temperature sensor is located at the chiller's cooling water pipe. The chiller, the first water temperature sensor, and the circulating water pump are all connected to the intelligent control unit 5. The first water temperature sensor detects the outlet temperature of the chiller's cooling water and transmits the signal to the intelligent control unit. When the outlet water temperature exceeds 30°C, the intelligent control unit controls the chiller to increase cooling capacity and increases the circulating water flow rate via the circulating water pump to cool the motor and bearings of agitator fan system 2.

[0028] The detection unit 6 includes a temperature sensor, a current transformer, a voltage transformer, and a second water temperature sensor. The temperature sensor is located inside the furnace and is used to detect the temperature inside the furnace. The current transformer and the voltage transformer are used to detect the current and voltage of the main circuit. The second water temperature sensor is located at the cooling water pipe of the chiller and is used to detect the outlet water temperature of the water cooling system 4.

[0029] The intelligent control unit 5 is connected to the stirring fan system 2, the electric exhaust fan system 3, the water cooling system 4, and the detection unit 6. The intelligent control unit 5 includes a connected intelligent digital regulator and a power controller. The intelligent digital regulator receives the furnace temperature signal from the detection unit 6, compares the received furnace temperature signal with the set temperature value, and controls the output of the power controller to control the furnace temperature. The intelligent digital regulator is a PID self-tuning regulator. This PID self-tuning regulator uses a PID self-tuning algorithm to automatically calculate the optimal PID parameters based on the characteristics of the controlled object. The furnace temperature control range is 100-900℃, with a temperature control accuracy within ±2℃. The intelligent digital regulator has a program control function, which can automatically calculate the cooling rate based on the set target temperature and time, and control the exhaust fan speed through closed-loop control to make the furnace temperature decrease at the set rate, with a cooling rate range of 0.2-1.0℃ / min.

[0030] The working process of this pilot-scale simulated coiling furnace is as follows: After the rolled pieces, cut into short sections, are fed into the furnace, the intelligent control unit 6, according to the preset cooling process requirements, controls the output of the power controller through the intelligent digital regulator to heat or maintain the temperature of the coiling furnace, ensuring that the temperature inside the furnace reaches the set value. Simultaneously, the agitator in the agitator system 2 starts to agitate the air inside the furnace, ensuring uniform temperature distribution within the furnace.

[0031] During the cooling process, the temperature sensor inside furnace 1 monitors the furnace temperature in real time. When the furnace temperature deviates from the set value, the intelligent digital controller automatically adjusts the output of the power controller according to the PID self-tuning algorithm, so that the furnace temperature quickly returns to the set value. The intelligent digital controller automatically calculates the cooling rate based on the set target temperature and time, and through closed-loop control, automatically reduces the set value over time at the set rate. At the same time, it controls the frequency converter to adjust the speed of the exhaust fan, so that the actual temperature follows the downward trajectory of the set value, ensuring that the cooling rate is stable at 0.2-1.0℃ / min.

[0032] The second water temperature sensor of the detection unit 6 detects the outlet water temperature. When the outlet water temperature is higher than 30°C, the intelligent control unit 5 controls the chiller to increase the cooling force and increases the circulating water flow through the circulating water pump to lower the water temperature, ensuring that the motor and bearings of the stirring fan system 2 are at a suitable operating temperature.

[0033] The current transformer and voltage transformer in detection unit 6 detect the current and voltage of the main circuit in real time, which makes it easy for operators to monitor the operating status of the system.

Claims

1. A pilot-scale simulated coiling furnace, characterized in that: It includes a furnace body (1), a stirring fan system (2), an electric exhaust fan system (3), a water cooling system (4), an intelligent control unit (5), and a detection unit (6). The furnace body (1) forms a furnace chamber inside, which is used to accommodate the rolled pieces and provide a cooling simulation environment. Heating silicon carbide rods are installed on both sides of the furnace chamber. The stirring fan system (2) is installed at the bottom rear side of the furnace body to stir the air in the furnace to ensure uniform temperature. The electric exhaust fan system (3) is installed at the exhaust port on the top of the furnace body (1) to regulate the air volume in the furnace chamber; The water cooling system (4) is connected to the stirring fan system (2) and is used to cool the motor and bearings of the stirring fan system (2); The detection unit (6) is connected to the water cooling system (4) and the furnace body (1) and is used to detect parameters such as the temperature inside the furnace, the current and voltage of the main circuit and the water outlet temperature of the water cooling system (4); The intelligent control unit (5) is connected to the stirring fan system (2), the electric exhaust fan system (3), the water cooling system (4) and the detection unit (6) respectively, and is used to receive the signal from the detection unit (6) and control the operation of each system according to the preset strategy.

2. The pilot-scale simulated coiling furnace according to claim 1, characterized in that: The intelligent control unit (5) includes an intelligent digital regulator and a power controller connected to each other. The intelligent digital regulator receives the furnace temperature signal from the detection unit (6), compares the furnace temperature signal with the set temperature value, and controls the output of the power controller to control the furnace temperature.

3. The pilot-scale simulated coiling furnace according to claim 2, characterized in that: The intelligent digital controller is a PID self-tuning controller. This PID self-tuning controller uses a PID self-tuning algorithm, which can automatically calculate the optimal PID parameters according to the characteristics of the controlled object, so as to improve the temperature control accuracy.

4. A pilot-scale simulated coiling furnace according to claim 3, characterized in that: The electric exhaust fan system (3) includes a frequency converter, a motor and an exhaust fan connected in sequence. The frequency converter is connected to the intelligent digital regulator of the intelligent control unit (5). The frequency converter receives control signals and converts them into motor speed signals. The motor receives the motor speed signals and drives the exhaust fan to run. The insulation class of the motor is ≥ F.

5. A pilot-scale simulated coiling furnace according to claim 4, characterized in that: The intelligent digital regulator has a program control function, which can automatically calculate the cooling rate according to the set target temperature and time, and through closed-loop control, control the speed of the exhaust fan to make the furnace temperature drop at a set rate, with a cooling rate range of 0.2-1.0℃ / min.

6. A pilot-scale simulated coiling furnace according to claim 1, characterized in that: The water cooling system (4) includes a chiller, a first water temperature sensor and a circulating water pump. The first water temperature sensor is located at the cooling water pipe of the chiller. The chiller, the first water temperature sensor and the circulating water pump are all connected to the intelligent control unit (5). The first water temperature sensor detects the outlet water temperature of the chiller and transmits the signal to the intelligent control unit (5). When the outlet water temperature is higher than 30°C, the intelligent control unit (5) controls the chiller to increase the cooling intensity and increases the circulating water flow rate through the circulating water pump.

7. A pilot-scale simulated coiling furnace according to claim 6, characterized in that: The detection unit (6) includes a temperature sensor, a current transformer, a voltage transformer, and a second water temperature sensor. The temperature sensor is located inside the furnace and is used to detect the temperature inside the furnace. The current transformer and the voltage transformer are used to detect the main circuit current and voltage of the furnace body (1). The second water temperature sensor is located at the cooling water pipe of the chiller and is connected to the water cooling system (4). It is used to detect the outlet water temperature of the water cooling system (4). When the outlet water temperature is higher than 30°C, the intelligent control unit (5) controls the chiller to increase the cooling force and increases the circulating water flow rate through the circulating water pump.

8. A pilot-scale simulated coiling furnace according to any one of claims 1-7, characterized in that: The temperature control range of the furnace is 100℃-900℃, and the temperature control accuracy is within ±2℃.

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