某600MW汽轮机组再热阀阀蝶断落事故

BREAKDOWN ACCIDENTS OF VALVE DISC FROM REHEATED STEAM VALVE OF ONE 600 MW STEAM TURBINE UNIT

介绍了某亚临界600 MW机组再热阀的工作原理,并结合实例对该机组再热阀阀碟断裂事故过程及原因做了分析,提出了该型机组安全运行中的注意事项,如再热阀开启前应注意暖阀,开启时将再热蒸汽压力调节至0.3 MPa以下,以及改进再热阀前后旁通管节流孔尺寸等。

The working principle of reheated steam valve（RSV） used for one subcritical 600 MW unit has been presented,the process and causes of breakdown accidant of valve disc from RSV of said unit being analysed by combining with practical examples,and the matters needing to pay attention in safe operation of said unit,such as paying attention to warm-up the valve before opening RSV,adjusting the reheated steam pressure to lower than 0.3 MPa during the time of opening RSV,as well as improving the orifice size on by-pass pipe before and after the RSV etc.,being put forward.