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分析了600MW超临界机组中,主蒸汽疏水系统用气动疏水截止阀出现内漏的原因,介绍了既能保证充分疏水,又能避免运行过程中内漏的小阀瓣气动疏水截止阀的结构、设计和选型。
This paper analyzes the reason of internal leakage of pneumatic trap valve used in main steam drainage system in 600MW supercritical unit and introduces the structure of the small valve pneumatic drain valve which can not only ensure sufficient drainage but also avoid leakage during operation, Design and selection.