一种改进型快减负荷控制方法的设计与应用

Design and Application of Improved RB Control Method

针对火电机组RB的传统动作及系统恢复过程中存在的不足,提出一种RB控制方案。对RB控制回路进行优化,通过闭锁风机大连锁逻辑,采用超驰方法和连锁功能,维持炉膛风量平衡,确保炉膛负压稳定;依照机组给水泵配置特点设计了给水泵RB逻辑,设计了RB触发时机,确保100%容量汽动给水泵跳闸连启1台50%容量电动给水泵时RB能够正确触发。RB试验结果表明,改进的RB逻辑设计合理,RB动作准确,机组可快速、安全降低负荷至目标位置,减少了系统恢复过程中风机启动数量,降低了机组故障状态下的运行风险。

In view of the shortcomings in the traditional operation and system restoration of thermal power unit RB, an RB control scheme is proposed. The RB control loop is optimized by locking the large interlock logic of the fans. The override methods and interlock functions are adopted to maintain the balance of furnace air volume and ensure the stability of furnace negative pressure. According to the configuration logic of the feed water pump, the RB logic is designed, and the RB triggering timing is presented to ensure that the RB can be triggered correctly when the 100% capacity steam-driven feed water pump trips and starts a 50% capacity electric feed water pump. RB test results show that the logic design of improved RB is reasonable, RB action is accurate, the unit can decrease the load to the target position quickly and safely, reduce the number of fans starting in the system recovery process, and reduce the operation risk in the unit failure state.