Study On Expert System In Circulating Fluidized Bed Boiler Burning Control Base On DCS

Recently as a new burning technology, Circulating Fluidized Bed(CFB) burning technology is widely applied in fire power based electrical generation industry in stead of the traditional methods. CFB Boiler has the features of large-delay, coupling tightly, multivariable and complicated control process. Currently in power plant, the main control process is still handled by manual operation. Focusing on the burning control issue of 75t/h CFB project. The further researches about expert system based on Distributed Control System(DCS) are carried out by simulating the manual control method of skilled engineers, The work provides a good trial on enhancing automation level of the CFB Boiler. The following works are focused:Expert system is developed in C Language Integrated Production System(CLIPS) and applied to deal with the parameter with Fuzzy Statistic. Visual C++ is used to develop the interface with the CLIPS through the Dynamic Link Library(DLL) mixed programming. With the Dynamic Data Exchange(DDE) expert system fulfills the function of communication with the DCS.Three-parameter control arithmetic is used after analyzing the water level dynamic characteristics under water supply and steam disturbance. By many investigation and practice and based on the engineering in Yishui city, the DCS is designed to integrate FAMA series control hardware (from Mirle Inc.) with SoftPLC control software (from Controlsoft Inc.). Combining with the control net and Ethernet, data communication can conform to the design requirements. DCS configuration includes data collecting, communication, PLCprogramming, HMI designing, warning and history data querying. Through testing in running the DCS fulfills the control requirements and the excellent control effect is achieved.