Design And Research Of Automatic Control System For Coal Powder Preparation

Along with the people’s environmental protection consciousness enhancement,environmental protection has become a human consensus and increase the primary energy utilization rate can significantly reduce our on the environment caused by pollution. In the use of coal field, coal dust instead of raw coal as a boiler fuel, can effectively improve the coal utilization, with huge economic and environmental benefits. With pulverized coal boiler to replace coal boiler has become a trend, but to each boiler is equipped with a set of pulverized coal preparation system of the cost is too high, is clearly unrealistic. In this situation, specializing in the production of coal clean energy companies also will more and more, so the research and development based on vertical mill pulverized coal system The control system is of great significance.This paper in Lanzhou Yuan Feng clean energy companies of pulverized coal preparation project process analyzed, clear the influence of pulverized coal preparation system elements and requirements of the control system. Based on the completion of the pulverized coal preparation control system of the overall program design, control system hardware design, control program design and configuration design, carry on operation optimization and debugging of the control system based on Fuzzy PID.The pulverized coal preparation system and thermal power plant usually adopts the direct blowing type pulverized coal preparation system is very different, the pulverized coal preparation system adopts the form of negative pressure and coal in the vertical mill before has been carried out to dry, do not need air into the vertical mill for drying. Because of the coal quantity to determine the mill pressure difference and main blower speed between the fuzzy PID control, to achieve the purpose of optimal control.The pulverized coal preparation system adopted to computer as upper machine,PLC as the lower computer structure. The PC monitor configuration software used is Win CC, the lower position machine uses is Siemens S7-300 series PLC, and with STEP7 programming software the compilation of program control, to complete the grinding control system design.According to the feedback from the field workers, the control system of the pulverized coal preparation is stable and reliable, and the monitoring operation interface is humanized, which meets the requirements of the customer’s control. The coal powder preparation system has great significance and application value.