The Research Of Control System Of CFBB

CFBB is the new generation of boiler which the recent years on international developed, is the present domestic and foreign esteems highly effective environmental protection boiler. Has the coal to plant the compatibility broadly, the load control characteristic good, the combustion efficiency high, the environmental pollution is small and so on the merit. The current our country factory actual automation level very is also backward, the CFBB very many control loop also continues to use the hand control, therefore realizes the boiler computer automatic control to have the vital significance.(1) This text from physically set out, with the Heilongjiang Shuihua grease factory 20 ton/ hour CFBB the item is a background, and primarily proceeds below research work. Introduce to follow the development general situation of the CFB technique first, and the local and current CFB of analysis automate the control's development level, and make sure the textual work contents.(2) This article first introduced CFBB the principle, the structure, the combustion system control duty and the CFBB merit, has conducted the analysis research to the CFBB control system, has analyzed between each main parameter coupling relations. Looked from the system that, CFBB mainly includes the fuel system, directs the wind system, the soft drink system. This article by 20 tons/Time CFBB is the research object, produced has controlled the subsystem one by one the control plan, design in the CFBB control system inside, can adopt the PID calculate way to be used as the basic control calculate way, and control the conduct and actions to control the system's basic construction with the string class, make control the system to design the simple.(3) Carried on the analysis to the boiler steam drum water level dynamic characteristic, has produced the chamber negative pressure, the steam drum water level mathematical model, and take most had the representative steam drum water level subsystem to conduct the control algorithm research as the research object, the control algorithm has used the cascade three impulses PID control.(4) Pass the experiment to get the water current to measure the unit step disturbed to move the next water level to respond the curve and vapor pack the water level to shut the wreath to look like to deliver the function, steam discharge unit step disturbed to move the next water level to respond the curve and look like to deliver the function, and the is negative...