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Analysis of Causes of Corrosion in Water Cooler of Atmospheric-vacuum Distillation Unit and Countermeasures

Wang Yong,Qi Rendong,Li Pufang(PetroChina Guangxi Petrochemical Company,Qinzhou,Guangxi 535008)  
Water cooler is one of common equipment in petroleum refineries,whose stable operation has a direct impact on process parameters and energy consumption of the unit.With increased varieties of crude oil being processed in China in recent years and crude oil is becoming increasingly heavier and acidic,great attention has been paid on the corrosion protection and materials of many heat exchange equipment have been upgraded.Whereas,the material selection for some non-critical cooler equipment has been ignored,which leads to frequent leaking or plugging of water coolers,imposing safety hazard on unit operation.To solve these problems,The chemical properties of corrosion products are analyzed to work out the corrosion mechanisms.It is found that the macro cell corrosion is the main cause of leaking of water cooler.In addition,the leaking causes are found out through comprehensive analysis of the operation process,and appropriate measures to control the corrosion of water coolers are recommended.
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