Study On The Application Of Frequency Conversion Technology In Thermal Power Plant Based On Energy Saving And Emission Reduction

The thermal power plant of the Energy and Environment Department in Shougang jingtang company is located in Caofeidian district of Tangshan city. This plant does not only bear the task of power supply, but also most part of the heating task in winter. Because of the current coal market fluctuation, quality of the coal supplied is uneven, and some have large scale deviation from the standard parameter designed, which will result in load fluctuations of the coal mills and thus low load operation conditions which severely decreases the efficiency of the coal mill, whilst causing the waste of energy.Innovation of frequency conversion on the high-voltage motor of the coal mill can effectively improve the efficiency of coal grinding machine, and the frequency convertor can effectively enhance the short-term capacity of mill through increasing rotate speed of the motor. The load fluctuation in operation often leads to frequent starts and stops the of the coal mill, while the motor of the mill is generally high voltage asynchronous motor with a starting current of 5-7 times the motor rated current of the motor. The impact of the high starting current brings the effect of motor stator coil overheating which severely reduces engine’s service life. Using of the frequency conversion technology can significantly reduce the starting current of the motor, and make a smoothly start which can effectively solve this kind of problem, prolongs the service life of the motor, reduce maintenance workload and cost of labor.The sustainable development of power generation enterprises, is facing a huge pressure to reduce coal consumption and to lower the auxiliary power ratio of the thermal power plant, especially after the reform of separation of the management of power plant from that of power grids. The development of high voltage frequency conversion technology provides favorable conditions for energy saving, emission reduction and energy conservation, as well as a short-term recovery of the investment cost.