新型国产1 050 MW超超临界机组高压主汽阀卡涩原因分析及改进

doi:10.11930/j.issn.1004-9649.201703079

摘要/Abstract

摘要： 某新型国产1 050 MW汽轮发电机组在168 h满负荷试运结束，投入运行后高压主汽阀逐渐出现卡涩现象，活动性及全行程试验时不动作或动作不到位。通过解体分析发现高压主汽阀套筒密封环损坏变形，阀杆与套筒、主汽阀碟间隙偏小两个因素导致主汽阀卡涩。通过调整油动机工作油压力及阀门运行、试验开关时间来减少主汽阀杆对套筒密封环的冲击，并对阀杆进行重新加工，增加阀杆与套筒及主汽阀碟的间隙，彻底解决了主汽阀卡涩现象，主汽阀回装后在日常试验及开关过程中正常到位。

关键词: 超超临界机组, 1 050 MW机组, 高压主汽阀, 卡涩, 工作油压, 间隙, 参数优化

Abstract: Upon the completion of 168-hour full load trial operation, the new type of domestic 1050MW unit was then put into operation. Unfortunately, main high pressure valves gradually became sticky and jammed, which caused action failure or in wrong position during operation and full stroke test. Through disassembly analysis, it is found that in addition to the damage and deformation of high pressure main steam valve sleeve seal ring, the narrow gap between valve stem and sleeve or main steam valve disc leads to the main steam valve sticking. In addition to adjusting the oil pressure of the oil pump and the operation of the valve as well as the switching time of the experiment to reduce the impact of the main steam valve stem on the sealing ring of the sleeve, the valve stem is reprocessed to increase the gap between the stem and the sleeve and the main steam valve disc, so as to resolve the problem of the main steam valve jam thoroughly. After the reinstallation, the main steam valve is back to normal place during the daily test and the switch process.

Key words: ultra supercritical, 1 050 MW generator unit, high pressure stop valve, jam, oil pressure, clearance, parameters optimization

中图分类号:

TK263.5

孟海洋. 新型国产1 050 MW超超临界机组高压主汽阀卡涩原因分析及改进[J]. 中国电力, 2018, 51(7): 90-94.

MENG Haiyang. Cause Analysis and Improvement on Jammed High Pressure Main Steam Valve of New Type Domestic 1 050 MW Ultra Supercritical Unit[J]. Electric Power, 2018, 51(7): 90-94.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.201703079

https://www.electricpower.com.cn/CN/Y2018/V51/I7/90

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