催化裂化装置再吸收塔吸收剂及工艺流程改造

Transformation on Absorber and Process of Reabsorber

中国石化上海石油化工股份有限公司3 500 kt/a重油催化裂化装置自2012年11月首次投产以来,始终存在干气不干现象。经过分析发现:由于催化柴油密度过大,再吸收塔内液相流动性差,造成再吸收塔压降增大、雾沫夹带、干气带液严重等问题,影响下游装置的正常运行。根据相似相容原理,进行了用顶循环油作为再吸收塔吸收剂的技术改造。结果表明:此项改造彻底解决了干气不干的现象,提高了液化气及汽油的收率,每年可产生直接经济效益9 000多万元。

Ever since the first launching into production, the dry gas produced by 3 500 kt/a heavy oil catalytic cracking unit of SINOPEC Shanghai Petrochemical Company Limited has long been not dry. Based on a series of analysis, the causes were found that excessive high density of catalytic diesel led to poor fluidity of liquid phase in reabsorber and increasing of pressure drop, fog carrying and serous liquid carrying of dry gas, which affected the normal operation of downstream plants. Technological transformation was made on the reabsorber to take tower top cycling oil as absorber according to the principle of like dissolves like. Result showed that the transformation completely solved the phenomenon of dry gas not dry, improved the yield of liquefied gas and gasoline, and could generate direct economic benefits of over 90 million RMB.