Research And Application In Energy-saving In The Coal Pulverizers Frequency Control System On300MW Electric Power Plants

Baotou second thermal power plant as heat power plant in coal market, due to changing circumstances, coal fuel deviate from the designed value is more, cause coal grinding mill output is insufficient, affected units with a load, coal application range is small, resulting in units with a load capacity is poor, especially the winter heating, heating period and no spare coal grinding machine, cause difficult maintenance, in order to improve the efficiency of grinding coal mill of inverter, the research can be used to improve the output, speed, to alleviate the shortage of capacity of pulverizer.。Coal grinding machine corresponding to different load, frequent start and stop, the asynchronous motor starting current rated current6-8times, the motor is started, the motor caused by thermal injury, using high voltage inverter speed control technology of asynchronous motor when driving, can the motor soft start, the starting current is very small, extended the service life of the motor. Reduce maintenance costs, reduce the maintenance workload of staff.The power of the continuous development of enterprises, especially after factory network is separate, the power plant must reduce the electricity rate, reduce energy consumption, increase the plant’s competitiveness in the market, more important, high voltage frequency conversion technology for the development of energy saving, energy saving and emission reduction work thorough development offers strong condition, using high voltage frequency conversion technology, can short period of recovery of investment.On3#unitl#,4#coal grinding machine for frequency conversion transformation, transformation efficiency and the energy saving effect is remarkable, can implement soft start, protection of coal grinding machine, to achieve the expected goal...