对原油常压蒸馏塔顶部防腐流程技术进行探讨.常压塔顶部采用两段冷凝冷却流程时,可以在空气冷却器之前设置油气换热器,以避免多台并联空气冷却器注水分布不均匀引起的露点消除困难,也可以在常压塔塔顶空气冷却器入口分支管嘴增加注水点,以及选择恰当流程排出常压塔塔顶回流罐中酸性水等措施减轻常压塔顶部系统腐蚀;塔顶采用一段冷凝系统时取消塔顶冷回流的流程,有利于缓解塔顶系统腐蚀.生产中控制常压塔塔顶回流罐操作温度或常压塔塔顶操作温度,皆能满足石脑油产品质量要求.%The technology for anti-corrosion of overhead system of atmospheric distillation column was discussed.When two-stage condensation system is selected,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.
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