Countermeasures for Corrosion in Crude Distillation Unit I

Crude distillation unit is the first process unit for processing crude oil.The rising sulfur and TAN in the crude will lead to a series of corrosion problems such as LP corrosion,HP corrosion and naphthenic acid corrosion which will aggravate the difficulties in equipment corrosion protection and process corrosion prevention and affect the long-term safe operation of the refinery process units.The corrosion in crude distillation unit is described,especially the corrosion causes,corrosion mechanisms,corrosion location and impact factors of HT sulfur and naphthenic acid.The countermeasures for corrosion protection are presented such as optimization of salt in desalted oil,optimization of addition of corrosion inhibitors of tower overheads to reduce the tower overheads corrosion,blending of crude oils and upgrading of materials to protect naphthenic acid corrosion and application of effective corrosion protection measures based upon corrosion detection,etc.All these can help to solve the corrosion problems of crude distillation unit.