燃气-蒸汽联合循环机组暖机负荷优化后的异常案例分析及处理

Analysis and Treatment of Abnormal Cases in Gas-Steam CombinedCycle Unit After Warm-up Load Optimization

为了提高SGT5-4000F型燃气蒸汽联合循环机组的经济性,采取了暖机负荷的优化方案。结合机组的中压旁路控制模式,对优化后汽轮机冲转异常的案例进行分析。结果表明:暖机负荷的优化方案可以缩短机组的启动时间,但是此方案在夏季会造成汽轮机无法冲转。通过对暖机负荷的再次优化即适当地增加燃气轮机的暖机负荷或者降低中压旁路在自动设定值控制模式(ASA控制模式)时的上限限制,实现了汽轮机正常冲转。

In order to improve the economy of a SGT5-4000F gas-steam combined cycle unit,the warm-up load optimization was adopted.Combined with the intermediate pressure bypass control mode of the unit,abnormal cases of steam turbine startup after optimization were analyzed.Results show that,the warm-up load optimization method can indeed shorten the startup time of the unit,but at the same time,this method will cause abnormal cases in which the steam turbine cannot startup in summer.The steam turbine can startup normally by increasing the warm-up load of gas turbine or reducing the upper limit of the intermediate pressure bypass under automatic setpoint control mode(ASA control mode)appropriately.