• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2013, Vol. 34 ›› Issue (8): 87-.doi: 10.3969/j.issn.1000-7229.2013.08. 016

• 发电技术 • 上一篇    下一篇

 600 MW超临界机组高压调节汽门伺服阀泄漏原因分析

 

刘凯,徐松,何铁祥,冯兵
  

  1. 湖南省电力公司科学研究院,长沙市410007
  • 出版日期:2013-08-01
  • 作者简介:刘凯(1981),男,硕士,工程师,从事电力设备腐蚀与防护等方面的技术研究工作,E-mail:lkbb0734@126.com; 徐松(1981),男,博士,工程师,从事电力设备腐蚀与防护等方面的技术研究工作,E-mail:sxu001@126.com; 何铁祥(1971),男,本科,高级工程师,从事火力发电厂热力设备化学清洗及炉内水工况优化等方面的技术研究工作,E-mail:htx7110@126.com; 冯兵(1972),男,硕士,高级工程师,从事电力设备腐蚀与防护等方面的技术研究工作,E-mail:fb8913@sohu.com。

Failure Analysis of Servo Valve Leakage of High Pressure Control Valve in 600 MW Supercritical Unit

LIU Kai,XU Song,HE Tiexiang,FENG Bing   

  1. Hunan Electric Power Corporation Research Institute, Changsha 410007, China
  • Online:2013-08-01

摘要:

某电厂一台600 MW超临界机组发生抗燃油泵电流增大、油压下降事件,排查可能的原因后判断此次事件为高压调节汽门伺服阀泄漏所致。对该机组抗燃油油质、伺服阀材质进行了成份化验,并进行了扫描电镜和能谱分析,结果表明,伺服阀泄漏主要为抗燃油酸值长期超标、氯离子含量偏高导致的点蚀和颗粒磨损共同作用所致。针对存在的问题提出了改进措施和建议。

关键词: 600 MW超临界机组, 抗燃油, 伺服阀, 点蚀, 磨损

Abstract:

The current of fire-resistant oil pump was increased suddenly and the oil pressure was descended in a 600 MW supercritical unit. Based on the failure cause investigation, it was suggested that the accident was caused by the servo valve leakage of high pressure control valve. The fire-resistant oil and the material of servo valve were analyzed by scanning electron microscopy (SEM) and energy spectrum analysis, as well as chemical compositions. The results show that the leakage of servo valve is due to the interaction of pitting corrosion and wear, which are caused by the long-term excess-standard of acid value and high chloride ion content of the fire-resistant oil. Finally, some improvement measures and suggestions were proposed according to the existing problems.

Key words: 600 MW supercritical unit, fire-resistant oil, servo valve, pitting corrosion, wear