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Research for the Control System of the Ball Mill with Double Inlets and Outlets

Author: YuanGang
Tutor: PanWeiJia
School: Changsha University of Science and Technology
Course: Power Machinery and Engineering
Keywords: Coal mill Fuzzy Control Pulverizing system Simulation Study MATLAB
CLC: TM621.2
Type: Master's thesis
Year: 2009
Downloads: 134
Quote: 1
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Abstract


Coal mill is important auxiliary equipment for thermal power plants, coal mill running a direct impact to the thermal power plant boiler whether security, economic, and stable operation, is also directly related to the entire unit of the power plant can safely economic stability operation. Coal mill is one of the big power of the power plant, it consumes about 15% to 25% of the thermal power plant electricity, coal mill is also a potential energy saving big. Double inlet and Ball Mill is widely used in the units of 300MW and above, but it is difficult to find a more accurate mathematical model of double inlet and outlet tube mill about double inlet and outlet of Ball Mill effective, easy to use control scheme pending further research and development. Thermal power plant, double inlet double ball mills most voted on automatically, manually run state. In this paper, the mechanism analysis, respectively mill coal bit, outlet temperature, coal mill load coal feeder to the amount of coal, hot air door opened, the the cold door opened Changes on analysis of the input and output physical quantity the relationship between the derived mathematical equations to obtain a respective transfer function. The basis of the overall dynamic characteristics of the various aspects and charged objects in the SIMULINK environment simulation, they step disturbance input signal, the output curve, the simulation results verify the correctness of the resulting mathematical model. This paper analyzes the double inlet and outlet of the control system of ball mills existing conventional PID control scheme. Cascade PID control scheme using the widely used double inlet and outlet of the control system of ball mills, mill mathematical model previously established on the basis of a comprehensive simulation study. Established in SIMULINK double inlet and overall simulation model of the control system of ball mills, each controller parameter tuning results obtained on the basis of a large number of simulation experiments. In the obtained optimum controller parameter based on a simulation study of the respective control systems in the step change to the amount of coal, hot air doors, cold door, given a step change, pulverizer coal bit outlet temperature, the output of coal pulverizer load curve. Study the robustness of the control system, the output curve basically consistent with the actual running curve. Double inlet and ball mills conventional PID control system, fuzzy PID controller instead of the original double inlet and outlet of Ball Mill control system conventional PID controller, fuzzy control instead and conventional PID controller is used in conjunction with the structure. According to the actual power plant run data to establish each charged the amount of the deviation and the deviation of the rate of change of the quantization interval, according to the power plant operating experience to the design of fuzzy control rules. Important parameters of the major components of change control system simulation studies, one by one analysis of fuzzy control system to control quality. The simulation results show that the corrected double inlet and double outlet of Ball Mill fuzzy control system has good control quality and robustness, and quality control of the existing conventional PID control system are compared, and come with double inlet The ball mills fuzzy control quality control system to control the quality of the conclusions to be slightly higher than the conventional PID control system.

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CLC: > Industrial Technology > Electrotechnical > Power generation, power plants > Power plant > Thermal power plants, thermal power stations > Boilers and combustion systems
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