Automatic Control Of Boiler Combustion Process

Natural circulation and fluidized bed boiler of 35t/h is a aid equipment to the secondmetallurgy department in thermal-power department of power factory Lin Gang Company,Tai Gang.It is one of the most important engineering project in l993, Lin Gang. Sinceworking in l995, boiler is often stopped by kinds of reason. Coal-tar is the main reasonof interruption. In the project of repaired this year, it is one of this.This paper takes the combustion processing control of 35t/h boiler repairing in LinGang as its thesis, and it emphasizes the combustion control of feed-coal system. It isdesigned about computer in hardware and software. It brings forward a scheme of closed-loop AC speed adjusting system of inverter based on 8098 single-chip micro-computerto realize the automation of measurement and control in feed-coal, and to get the bestvalue of the proportion of wind-coal. So the accident is reduced and the economicefficiency is raised. Through the single-chip micro-computer's outer interface circuit it isconnected to other controlling system, and it manages the water-level automaticcontrol system, stem temperature automatic control system, furnace pressure automaticcontrol system, boiler combustion automatic control system and so on. Thus it isensured its good working for safety and economy.Boiler is a complicated controlled object, for its parameters are always varying withfurnace condition. So it is difficult to get satisfied controlling effect when traditionalcontrolling algorithm is used. According to this case, a self-adaptive fuzzy algorithm isput forward In this paper. The controlling algorithm is studied and simulated. Thesimulation experiments manifest that the controlling system has small exceeding valueand good stability when using this algOrithm. Meanwhile, it can adqPt the vaIyingparameters of controlled object.