常顶换热器腐蚀分析及对策

Corrosion of Atmospheric Distillation Tower Overhead Heat Exchanger and Countermeasures

中国石油化工股份有限公司西安石化分公司1．0 Mt/a常压装置加工原油性质与设计原油性质相比变化较大,致使常顶换热器腐蚀严重,多次发生穿孔泄漏。文章对该现象的发生原因进行了分析,并采取了优化电脱盐操作、强化塔顶pH值控制、筛选适宜的破乳剂和缓蚀剂以及对换热器管束进行涂层处理等防腐蚀措施,取得了一定的效果。

As the crude properties vary greatly from those in design in 20,000 BPD atmospheric distillation unit in SINOPEC Xi＇an Petrochemical Company, the overhead exchangers suffer from severe corrosion and corrosion failures. The corrosion causes are analyzed and corrosion control measures are taken such as optimization of electro-static desalter operation, strengthened overhead pH value control, selection of appropriate emulsion breakers and corrosion inhibitors and application of proper coating for heat exchanger tubes. Good results have been achieved.