华电技术 ›› 2018, Vol. 40 ›› Issue (11): 31-33.

• 技术交流 • 上一篇    下一篇

680MW超超临界机组真空突降原因诊断

  

  1. 1.华电电力科学研究院有限公司,武汉〓430000; 2.中国电建集团湖北工程有限公司工程建设公司调试分公司,武汉〓430000;3.西安热工研究院有限公司,西安〓710032
  • 出版日期:2018-11-25 发布日期:2018-12-29

Diagnosis of vacuum drop of 680MW ultrasupercritical unit

  1. 1.Huadian Electric Power Research Institute Company Limited, Wuhan 430000, China; 2.Commissioning Branch of POWERCHINA Hubei Engineering Company Limited,  Wuhan 430000, China; 3.Xi’an Thermal Power Research Institute Company Limited, Xi’an 710032, China
  • Online:2018-11-25 Published:2018-12-29

摘要:

针对某电厂 #4机组运行期间发生真空突降的情况,使用氦质谱真空检漏仪对真空系统进行查漏。通过对怀疑区域检漏、调整、分析,发现B汽动给水泵汽轮机轴封管道破损是导致真空下降的原因。更换轴封管道后,有效地解决了 #4机真空下降的问题,凝汽器真空恢复正常,真空严密性试验合格。

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Abstract:

In view of the vacuum drop occurred during the operation of unit No.4 in a power plant, the vacuum system was checked for leaks within a helium mass spectrometer. Through leak detection, adjustment and analysis of the suspected areas, it is found that the breakage of the shaft seal pipe of the B steam feed pump turbine is the cause of the vacuum drop. After replacing the shaft seal pipe, the problem of vacuum reduction of the No.4 was effectively solved.The condenser vacuum returned to normal, and the vacuum tightness test passed.

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