Application Of Fuzzy Control In The Steam-Injection Boiler Burning Pulverized Coal Control System

Steam-injection boiler is the key equipment of thermal drive, and it is also the equipment whose energy consumption is the largest in the thermal drive process. With the enlargement of heavy oil recovery's scale, the problem how to enhance the dryness quality and decrease the energy consumption of steam-injection boiler is getting more and more important.Since steam-injection boiler was introduced from America at 1980s, the manufacture of it has realized industrialization interiorly. But the control system of steam-injection boiler still stays at the quondam technologic level. It's control efficiency is not high, too. Along with the constant development of advanced control theory and computer technology, that applying the advanced control technologies such as fuzzy control to the control of steam-injection boiler and enhancing the control efficiency of control system has became an inevitable trend.Based on the systematic expatiation on technologic process of steam-injection boiler, this paper analyzes the control effects that the control system of steam-injection boiler must achieve and puts forth the difficulties that control system may encounter. Dryness fraction and steam pressure are the important parameters of steam-injection boiler. They are the bottlenecks that hamper the safe and economical operation of steam-injection boiler, too. So according to the characteristics of boiler system, this paper proposed the control scheme based on fuzzy control to adjust the run parameters of boiler. Steam pressure, the scale of wind and coal fuzzy control system has been designed based on the collected real-time data due to many variation and random disturbances. Moreover, the simulation result of Fuzzy control by Matlab language has been applied in the system.Dryness fraction is measured by detecting inlet water and output water conductor analysis during the implementation of dryness fraction control strategy. Feed forward-feedback control technology that is good for engineering has been adapted to the system based on analysis of its primary effect. Good resolution and stability has been obtained. Besides, the whole the hardware of the control system are achieved and some of the monitor and control software has been programmed.