W火焰直流炉协调控制策略及工程应用优化

控制系统优良的协调控制品质对火电机组以及电网的安全稳定经济运行具有十分重要的作用。以配置双进双出磨煤机、W火焰炉的620 MW超临界参数机组为例，介绍了一种基于入炉煤量软测量计量的协调控制策略及其工程应用效果，详细分析了各控制回路指令的组成元素以及相互之间的耦合关系。根据实际变负荷试验结果，分析其存在的问题，有针对性地进行优化。优化后的实际变负荷试验结果表明，机组负荷、主蒸汽压力、主蒸汽温度等主要运行参数控制平稳，动态、稳态指标均优于规程要求。

The Coordinated Control Strategy for W-Flame Once-Through Boiler and the Optimization for Its Engineering Application

A control system of superior coordinated control quality is vital to the secure, stable and economic operation of a power generation unit and even the electric grid. Taking a 620 MW supercritical unit equipped with double inlet and outlet mills and a W-flame once-through boiler as the study object, a coordinated control strategy based on soft sensing of the feed coal quantity and its engineering application effectiveness are presented. The components of each control loop command in the coordinated control system and the mutual coupling relationship are analyzed in details. According to the test results under actual load fluctuations, the control defects are figured out, and the corresponding optimization scheme is conducted. The results after optimization suggest that the controls over the operating parameters such as the unit load, the main steam pressure and the main steam temperature are in steady state with both the dynamic and static control qualities exceeding the standard requirements.