Abstract: The technology for anti-corrosion of overhead system of atmospheric distillation tower was discussed. When two-stage condensation system is chosen, adding heat exchangers in front of the air coolers can avoid the difficulty of eliminating dew point caused by water misdistribution inside the air coolers. Extra water injection points can also be installed on branch pipes of air cooler inlets at the top of the column so as to minimize corrosion. Meanwhile, appropriate process can be set up for overhead product drum to discharge sour water to decrease damage from corrosion in the overhead system of the column. When one-stage condensation system is used, cancelling the overhead cold reflux flow can protect the column overhead system from corrosion. During operation, controlling either the temperature of overhead reflux drum or the temperature at the top of atmospheric column can meet the quality requirements of naphtha product.

Key words: atmospheric distillation colimn, overhead system, corrosion protection, Operation control solution