Design Of The Selective Catalytic Reduction Flue Gas Denitration Control System

NOx is a major contributor to acid rain and photochemical smog, is one of the main pollutants in the atmosphere. Statistics show that China air pollutants in about 60% of NOx from coal combustion, and coal burning thermal power plant is the major consumption side. Thermal power plant boilers burning coal to produce a lot of smoke, in order to reduce the NOx emissions, must be generated by thermal power plant flue gas denitration treatment. Among the denitration process, the selective catalytic reduction (SCR) DeNOx process of its simple structure, reliable operation, convenient, high denitration efficiency, no by-products, and many other advantages, become the most widely used denitration technology.In this paper, SCR flue gas denitration system technological process and control system optimization are discussed. Taking a 2 x 660 mw power plant as the research object, illustrates the SCR denitration system working principle, hardware structure, the factors influencing denitration, control logic, etc. the PID simulation results of Ammonia injection quantity control system is given. Based on PSO algorithm is easy to adjust, the advantages of fast convergence speed, using PSO algorithm, Optimization of ammonia injection quantity control system PID parameters. The results showed that using PSO algorithm to optimize traditional PID controller parameters,can make the system faster to reach a steady state, small overshoot, has a good practicability.