华电技术 ›› 2018, Vol. 40 ›› Issue (11): 17-20.

• 技术交流 • 上一篇    下一篇

高温再热器改造及其存在问题处理

  

  1. 华能巢湖发电有限责任公司,合肥〓238015
  • 出版日期:2018-11-25 发布日期:2018-12-29

Modification of high temperature reheater and its problem solving

  1. Huaneng Chaohu Power Generation Company Limited,Hefei 238015, China
  • Online:2018-11-25 Published:2018-12-29

摘要:

某电厂600MW超临界燃煤发电机组,投产以来多次发生高温再热器倒U型弯处焊缝脱焊以及高温再热器异种钢焊缝失效引起机组停运,对此,电厂根据锅炉厂家要求进行了倒U型弯改造和异种钢焊口移位改造。改造运行3年来未发生倒U型弯管材拉裂和异种钢焊口引起的爆管事故。针对改造后出现的再热器出口小集箱管座焊缝裂纹,通过挖补焊的方法得以解决。

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Abstract:

A 600MW supercritical coalfired generator set in a power plant had stopped  many times because of the weld desoldering of inverted Ubend and weld failure of dissimilar steel of hightemperature reheater since the commissioning. In this case, the power plant carried out the inverted Ubend transformation and displacement modification on dissimilar steel welding joints, according to the requirements of the factory. There has been no tube burst caused by inverted Ubend pipe cracking or dissimilar steel welding joints in the 3 years after the modification.The weld cracks of the small header pipe socket of the reheater appeared after transformation, can be solved by patching and repairing welding.

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