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Mineral Grinding Mill

Mineral Grinding Mill technology innovation

Reduce the crossover area of ​​the spout ring. The actual calibration shows that the air volume of the circulating crusher of the Mineral Grinding Mill system is 900,000 m3/h, the total pressure of the fan is 11,000 Pa, the wind speed of the spout ring is 33.6 m/s, and the rated index: the air volume is 850,000 m3/h, the pressure is 11500 Pa, and the design speed of the spout ring is 40. Compared with ~60m/s and design air volume of 750,000m3/h, the actual wind pressure and air volume of the fan basically meet the design requirements. The actual wind speed of the spout ring is smaller than the design wind speed, but the air volume far exceeds the design value. According to the analysis, this is the direct cause of the large amount of slag discharged from the Mineral Grinding Mill and the excessive amount of fine materials. Therefore, in June 2012, the method of reducing the wind area was adopted, and 100 mm was sealed around the nozzle ring. At the same time, the air leakage parts of the Mineral Grinding Mill disc, the three-way valve and the buffer cylinder were sealed to increase the wind speed to 58. m/s, the fan inlet damper can also be fully opened, the current is reduced from 255A to 230A, the fan efficiency is increased from 60% to 80%, the raw material output is increased from 410t/h to 450t/h, and the power consumption is reduced to 20.35kWh. /t, and the output no longer has significant fluctuations.

The main motor of the Mineral Grinding Mill and the main motor of the circulating fan are added with a variable load feeder to increase the power factor of the motor. The variable load phaser is connected in series in the rotor circuit of the motor. The operating current and voltage signals of the motor are collected to determine the running state of the motor, and the state information is sent to the MCU synchronously with the other signals provided by the rotor current sensor and the power frequency voltage. Processing, automatic adjustment of dynamic compensation. After the two devices of our company were installed in the feeder, the current dropped by about 30A, and the stator temperature of the motor was reduced. At the same time, the running current of the main motor of the circulating fan motor and the Mineral Grinding Mill is less than the rated current, and it is stable at around 240A. At the end of the month, the average monthly output of the Mineral Grinding Mill was increased to 480 t / h, and the power consumption dropped to 17.63 kWh / t.

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