Application Research Of DCS In Circulating Fluidized Bed Boiler Control

Fluidized Bed combustion technology is a high effective and clean technology. Application in the boiler field becoming more and more common. Circulating Fluidized Bed (CFB) combustion technology is one of the best commercial degree of clean coal combustion technology, which can meet with current environmental requirements. Circulating Fluidized Bed Boiler (CFBB) is a control object whose features have distributing parameter, non-linear,time-variable, great coupling, and the time of large lag. With the current automation level's improving, the control of Circulatin Fluidized Bed Boiler have some development, but the actual automation is not high, many control circles are handled by manual operation. So it is necessary to design & develop a Distributed Control System(DCS) to meet with control requirment. Background of this article is according to the actual engineering, based on the analysis of the Circulating Fluidized Bed Boiler (CFBB) work machanism, to make the control problem of bubbles in the water level of CFBB as a key reseach, design & develop a set of distributed control system for CFBB. Main work have been completed as follows:1. The analysis of the Circulating Fluidized Bed Boiler (CFBB) work machanis Review the technology development of CFB,make a detail analysis on the influce factors of CFBB combustion control.2. The research of Control agorithm Decoupling control for the complex system of Fluidized Bed Boiler, divided into single subsystem according to the analysis result, research combustion control agorithm detaily, and take the most representative of bubble water level subsystem as research object, use sting grade tri-impulse PID control, have a simulation research of the actual system.3. Design and selection of DCS control system The article design & develop a set of middle, small power station of CFBB DCS control system which evaporation below 75t/h. Selection ECS-100 hardware and SCKEY control software from Zhongkong company in Zhejiang province.4.System configuration programming and commissioning The article describes DCS system configuration scheme, including data acquisition, data communication, control programming,monitoring picture of PC, alarm and historical data inquiry.This paper aiming at the control system of CFBB, using domestic hardware and software, design a set of DCS control system which meet with middle, small type boiler, it is satisfied with us look from actual operation of the control effect, this control method whose control high-speed,stability, adaptability, all have reach the device requirment. Time and objective condition limited, other circles of boiler have not been discussed in this paper, this subject leave for the future.