大型汽轮机供除氧器抽汽逆止阀故障的分析及对策

Analysis and Countermeasures of Extraction Check Valve Fault in Large Steam Turbine Oxygen Supply and Deaerator

针对汽轮机四段抽汽供除氧器分支逆止阀在机组降负荷过程中不严密,除氧器内蒸汽出现倒流的问题,根据2次故障案例进行认真分析,提出了2种抽汽逆止阀型式的运行和检修控制措施,对今后防止类似故障再次发生将具有借鉴作用。

In view of the four period of extraction steam turbine for deaerator branch non-return valve in the process of the unit load down imprecise,deaerator in steam reversal problem,according to careful analy. sis of two fault cases, put forward operation and maintenance control measures of two kinds of extraction check valve,which has reference meaning for preventing similar faults happen again in the future.