Description of Electric Control for Pulverized Coal Vertical
Date:2020-09-15 11:30:05
Author:admin
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First. Start of the pulverized coal vertical mill system
Startup: Lubrication system (Thin oil station) motor → Separator motor (frequency conversion motor) → Roller lifting → Main motor → Feeding and falling roller → Hydraulic system motor (pressurizing).
Operation of the mill and its description:
After the mill is started in the starting sequence, the material is fed at the set value, the hydraulic system is operated to drop the grinding roller, the oil pump motor of the hydraulic station is turned on, the working pressure of the hydraulic system is adjusted to balance the system, and the separator rotor speed should be adjusted to make The fineness of the product meets the requirements.(The specific method is to first adjust the separator to a higher speed, and adjust the rotor speed according to the product sampling analysis results to obtain the required fineness).
During operation, the temperature of the gas entering and exiting the mill should be adjusted according to the moisture content of the material. The greater the moisture content of the material, the higher the temperature of the gas entering and exiting the mill, but the highest temperature of the milling gas should not exceed 300°C.
Note: 1. If the thin oil station runs continuously for 5 minutes without abnormal conditions, the mill can be started in the order of driving;
2.After the roller is lifted to the highest position, the main motor of the vertical mill starts, and after running together for 5 minutes without abnormal conditions, the feed command of the vertical mill system starts, and the material reaches the mill at time t1 (time t1 is determined by the site). Start the roll down action, 40s after the roll down action starts, start the roll pressure control program, that is, press the set pressure to automatically execute the pressure and automatically execute the pressure and pressure operation;
Second. Normal shutdown process of pulverized coal vertical mill system
Shutdown: Stop material command start----Feeding operation stop----Start roll lifting operation----Vertical mill main motor stop----Oil station operation stop----Hydraulic station stop
Third. Emergency shutdown
Mill stop----Stop material command start----Feeding operation stop----Start roll lifting operation----Hydraulic station stop
Fourth. Description of other electrical control components for vertical mill
1. Vertical mill vibration sensor control:
a. Vibration amplitude: 4 mm/s, 6 seconds delay alarm;
b. Vibration amplitude: 6 mm/s, emergency shutdown with 6 seconds delay.
2. The pressure difference of the mill is interlocked with the opening of the inlet air valve of the fan:
a. When the vertical mill pressure difference changes by 100Pa, the opening of the air valve at the fan inlet changes proportionally by a%, and the value of a is actually measured.
b. Pressure difference ≧ 7000Pa (reference value) Stop material
Pressure difference ≦ 6500Pa (reference value) Feed material
