利用蒸馏装置回炼系统降低炼油厂挥发性有机化合物排放

REDUCING VOCs EMISSION OF REFINERY BY DISTILLATION UNIT WASTE OIL RECYCLE SYSTEM

中国石油独山子石化分公司炼油厂为降低挥发性有机化合物(VOCs)排放对各生产装置采取操作优化措施。其中蒸馏装置降低取样频次,回收取样产生的轻污油,消除设备密封泄漏点;优化脱丁烷塔塔顶及常压塔塔顶操作,将蒸馏装置石脑油初馏点由42℃提高至49℃,降低石脑油罐区VOCs排放;将炼油新区各装置送往中间轻污油罐区的轻污油通过蒸馏装置大循环线进入原油泵入口进行回炼,实现中间罐区不接收不储存轻污油,减少了全厂VOCs排放,有效改善厂区生产环境。

Dushanzi petrochemical refinery took measures to reduce light waste oil emissions for operating units.The sampling frequency for distillation unit was reduced and the waste samples produced by sampling were recycled.The sealing conditions of equipments were carefully examined.The conditions at debutanization tower top and atmospheric tower top were optimized to increase the initial boiling point of naphtha from 42℃to 49℃,resulting in reduction of the VOCs emission in naphtha tank area.The light waste oils from units of the refinery were recycled through the circulation line system of the distillation unit and received at the entrance of the crude pump of the atmospheric distillation tower,instead of sending into the middle tanks,thus reducing the VOCs emissions of the plant,effectively improving the plant production environment.