Design And Implementation Of DCS In The Control System Of Circulating Fluidized Bed Boiler Unit

Circulating Fluidized Bed Boiler(CFBB) technology is an efficient, clean and low pollution combustion technology recently developed, it has an extremely important position in environmental protection and energy development,and it meet current environmental requirements. Circulating tluidizcd bed boiler is a control object of non-linear, multivariable, large time delay, strong coupling. Though level of the automation in the circulating fluidized bed boiler developed, the control effect of couldn’t meet the control requirements,so design a well DCS control system of is very important.This thesis mainly study combustion control system of circulating fluidized bed boiler, that the bed temperature-main steam pressure control system. The system suffers from coupling, and it must be decoupled, This thesis used a feed-forward compensation decoupling method, control it with the internal model control body after it be decoupled. optimized controller parameters by the second-order turbulence using particle swarm,the objective function is the ITEA, the last the control system simulation,do the system given value disturbance, interference, robustness,verify the possible solutions by experiments.Verified by testing the feasibility, the final chapter achieved on the bed temperature control of main steam pressure control of Guodian Zhishen EDPF-NT DCS products in Beijing Co., Ltd..Analog control achieved in loop, sequence control achieved in the ladder.Finally, the good screen is downloaded to the DPU, after commissioning the factory.The paper summarizes the work, and prospects future need to work research and exploration.