超超临界机组辅机故障减负荷过程重要运行参数控制优化

Control and optimization of important operation parameters in RB process of ultra supercritical units

燃煤机组辅机故障减负荷(RB)过程中重要运行参数的控制品质直接影响机组运行安全性及稳定性,本文针对超超临界机组RB过程中给水流量、炉膛负压、一次风压及水煤比存在的控制问题进行分析,并对原采用的前馈控制、PI控制、速率控制、跳磨煤机逻辑、变参数控制等控制策略提出了相应的优化方法。优化后机组RB过程中重要运行参数变化更加平稳,该优化方法对超超临界机组RB过程控制具有较强的参考意义。

The control quality of important operating parameters in RB process directly affects the safety and stability of coal-fired unit.In this paper,the control problems of feed water flow,furnace pressure,primary air pressure and water coal ratio in RB process of ultra supercritical unit are analyzed and summarized,and the original control strategies such as feedforward control,PI control,rate control,mill trip logic and variable parameter control are optimized.After optimization,the important operating parameters of RB process change more smoothly,indicating the proposed optimization method has a strong reference significance for RB process control of ultra supercritical units.