负压进汽凝汽式汽轮机紧急停机设备设计及研究

Design and research of emergency shutdown equipment for negative pressure inlet condensing turbine

常规工业汽轮机通常配置快速关闭进汽阀,以实现汽轮机紧急停机。某负压进汽凝汽式汽轮机进汽参数低,进汽蒸汽容积流量大,且汽轮机进汽端和排汽端的压差小。为减小进汽压力损失,不设置新汽速关阀,而是在汽轮机排汽端采用冗余的大通径快速真空破坏阀。当汽轮机需要紧急停机时,打开快速真空破坏阀,使大气快速进入汽轮机排汽端,汽轮机排汽端的压力迅速上升。针对所研究的进排汽压差为40 kPa的汽轮机组,最短可在4 s内实现汽轮机进汽端和排汽端压差为0,使汽轮机刹停,达到汽轮机紧急停机的目的。

Conventional industrial steam turbines are usually equipped with quick-closing inlet valves to realize emergency shutdown of the turbine.In this paper,a negative pressure inlet condensing steam turbine was studied has low inlet parameters,large inlet steam volume flow and small pressure difference between inlet and exhaust steam ends.In order to reduce the intake pressure loss,the quick-closing inlet valves are not employed,but a redundant large-diameter rapid vacuum breaker valve is used at the exhaust end of the turbine.When the turbine needs emergency shutdown,open the quick vacuum breaker valve,so that the atmosphere quickly enters the exhaust end of the turbine,the pressure of the exhaust end of the turbine rapidly rises,In this paper,the steam turbine whose inlet and exhaust steam pressure difference is 40 kPa is studied,and the pressure difference between the inlet end and the exhaust end of the turbine could reach 0 within 4 seconds,so that the turbine is closed,and the purpose of emergency shutdown of the turbine is achieved.