用模块化DCS实现燃煤热水锅炉的燃烧控制

The combustion control of a coal fired bolier performed by a modularized DCS

石油大学供热微机测控系统选用了模块化ＤＣＳ。本文对硬件系统进行配置：针对燃烧控制系统时滞大、耦合性强、随机干扰多的特点，对出口水温采用“等等看”控制算法；对氧含量采用前馈—反馈控制，控制算法中采用了积分分离的ＰＩＤ算法；针对负压对象信号波动范围大等特点，以负压变化趋势来控制引风量的办法。

A modularized DCS is selected for use with a microprocessor-based measurement and control system for heating supply.A hardware system is configurated.In view of the features of the combustion control system,such as a long time lag,strong coupling capacity as well as many random disturbances,the control algorithm of 'wait and see' is used to control the water temperature at the outlet.The feedforward/feedback control is used to control the oxygen content.The PID algorithm of integral separation is used in the control algorithm.In accordance with the range of signal fluctuation from a controlled combustion chamber with a negative pressure,the trend of variations in the negative pressure is used to control the air draught.