The Test Research Of Dynamic Characteristics On Proportional Pressure Regulation Of Coal Pulverizer

Coal pulverizer is the important equipment in coal pulverizing system, the quality of coal mill is directly related to boiler equipment’s the combustion rate and efficiency. Regulating system mostly use traditional hydraulic system in the actual production of coal milling process, and the pressure can’t be Continuously controled according to the actual needs, it caused serious waste of energy in practical production.In view of the above questions, the subject combine the needs of the coal pulverizer to the actual situation, electro-hydraulic proportional pressure system is designded to satisfie the needs for continuous pressure of pulverizing system, analyse the consitution、meaning and characteristics of the electro-hydraulic proportional system, compare the proportional valve and servo valves, and propose the feasibility of the system pressure ratio. At the same time, hydraulic major components (proportional relief valve and hydraulic cylinder) are established the mathematical model through the pressure and flow equations, the needs of the coal pulverizer to the actual situation are analysised, the parameters of the main components are calculated and the models are selected.The parameters of calculation and the sample are put into the mathematical model. The simulation diagram is set up under simulink in the simulation of MATLAB software, and the simulation is done. The static and dynamic response of the regulating system proportion are obtained, the proportion of regulating system is an unstable system and dynamic response is not reach the requirements,which can be obtained through analysis and observing.PID calibration is adopted to solve the unstable system, and the PID controller is designed, the static and dynamic response of system dynamic PID after correction are obtained, it still can not meet the requirement of system through observing the simulations. At last, the parameters of PID controler are adjusted useing the critical ratio methodthe, the parameters is adjusted through the test method, finally the ideal PID control parameters are got, the static and dynamic response of system sastisfied the requirement of system. Simulation results show that the design of regulating system through the proportion of PID control parameters after correction have the advantages of fast responsing, small overshoots, smooth step responsing, stability degree and smooth pressure controling, continuous, it can meet the needs of system.