The Strategy Optimazation On Circulating Fluidized Bed Boiler Bed Tempreture Control

With the development of power plants, more and more requirements are raised to protect environment nowadays. Due to the reduction and exhaustion of high quality coal resources, the development of pulverized coal-fired boilers would be limited by both environment protection and resources shortage. Meanwhile, lots of researches about burning low quality coal are processing, therefore a lot of methods and technologies, which include CFB, circulating fluidized bed, burning technology, appear. CFB burning technology adapts to this need. The advantage of CFB is that both superior and inferior coal can be burned. So it is much better than the traditional technology. Furthermore, limestone in CFB boilers can be desulphurized and denitrified, which offered a great improvement in pollutant emission. Using the features of CFB, the goal of efficient use of resources and clean combustion can be achieved, which can offset the shortcoming of pulverized coal-fired furnaces to some extent. We can expect that in the future CFB boilers will be in an indispensable position in the development of power plantWith the use of CFB boilers from small capacity industrial furnaces to large capacity power plant boilers, there are quite a lot of research papers about CFB. However the knowledge we have known about CFB is still insufficient. Some burning feature is still not well mastered. Moreover some working CFB boilers still have problems, such as CFB boilers'bed over temperature and coking, combustion instability, main steam pressure fluctuation and CFB boilers water wall wear. The ability of automatically controlling CFB boilers affects the scope of using CFB boilers. So resolving the problem of bed's temperature control is the key. Based on the previous research results I will continue to explore the application of the fuzzy control system on CFB, using the fuzzy control strategy to improve the control of the CFB boilers'bed temperature, and optimizing the fine tuning scheme by using regulation scheme based on the rules of multiplication instead of the adjustment scheme based on the rules of addition, which is proved to be feasible by simulating the performance on MATLAB platform.With the development of CFB boilers, more and more requirements are raised to DCS, distributed control system, which has become an indispensable part in power plant. Finally, the article introduces the DCS system fuzzy configuration strategy, and the fuzzy configuration control principle diagram is given.