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第 32 卷第 1 期机械工程材料 Vol. 32 No. 1
2008 年 1 月 Materials for Mechanical Engineering Jan. 2008
炼油厂电脱盐换热器腐蚀失效分析
王赢利, 王建生
(兰州石油化工公司,甘肃兰州 730060)
摘要: 通过对某炼厂焦化装置电脱盐换热器的腐蚀形貌检测、腐蚀产物化学成分分析、电脱盐
水质分析,结合生产工艺对换热器的腐蚀原因进行了探讨。结果表明:壳程腐蚀是由于新鲜水中含
有的钙2、钡2 及泥沙聚集在2换2热器壳程表面而导致垢下腐蚀和小阳极大阴极电化学腐蚀;管程腐蚀
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是由于电脱盐水的 p H 值过低造成的析氢电化学腐蚀。
关键词: 焦化; 电脱盐; 换热器; 腐蚀
中图分类号: TQ050. 9 文献标识码: B 文章编号: 1000 3738 (2008) 01 0081 03
Corrosion Analysis of Heat Exchanger in Electric Desalter of Delay Cooking Unit
WANG Ying li , WANG Jian sheng
(Lanzhou Petroleum and pany Corporation , Lanzhou 730060 , China)
Abstract : By observing the corrosive appearance of the disabled exchange heater , analyzing the chemical
component of corrosion product and water quality for the electric desalter , and investigating the technical conditions
of the exchange heater , the corrosion reason of the exchange heater used for electric desalter in a delay cooking unit.
The results show that the failure of the outer tube surface of exchange heater is induced by the under deposit
corrosion resulting from gathering of calcium , barium and bedload in fresh water on the tube surface. The failure of
the exchange heater tube inner surface is caused by electrochemical corrosion in the desalting water having lower p H
value.
Key words : delay cooking unit ; electric desalter ; heat