摘要
某新建电厂超超临界#2机组在带负荷试运期间,多个空冷管束发生泄漏问题,严重影响机组的安全性和可靠性。为解决这一问题,对泄漏管束进行仔细检查和分析,认为管束入口出现局部损伤的主要原因是由冲刷腐蚀造成的。同时循环水较高的pH值破坏了铝管表面的氧化膜,加剧了管束腐蚀情况。在此基础上,采用对受损管束腐蚀部位加装衬管的处理方法,缩短了检修周期。并且提出了增加阳床循环水处理装置、循环水加入二氧化碳降低pH值以及相关运行操作等优化建议,有效地控制了机组腐蚀泄漏情况。
Multiple air cooling tube bundles were leaked in#2 ultra super-critical unit of a new power plant during the period of on-load operation.The safety and reliability of the unit was seriously affected.In order to solve this problem,the leakage tube bundles were carefully checked and analyzed.It was considered that the main cause of local damage at the inlet of the bundle was erosion corrosion.At the same time,the oxide film on the surface of aluminium tube was destroyed by the higher pH value of circulating water.So the corrosion of tube bundle was aggravated.On this basis,the method of installing liner to corroded parts of damaged bundles was adopted and maintenance period was shortened.Some optimum suggestions,such as increasing the cation bed which was the treatment device of the circulating water,adding carbon dioxide to the circulating water to reduce the pH value and relevant operation,were proposed.And the phenomenon of corrosion leakage was effectively controlled.
作者
王斌
殷戈
白冬波
谭锐
蒋国安
陈禄
杨乐
WANG Bin;YIN Ge;BAI Dong-bo(GuoDian Nanjing Electric Power Test Research Co.,Ltd.)
出处
《电站系统工程》
2020年第4期39-42,共4页
Power System Engineering
关键词
间接空冷系统
冲刷腐蚀
化学腐蚀
pH值
衬管
阳床
indirect air cooling system
erosion corrosion
chemical corrosion
pH value
liner tube
cation bed
