重油MIP与劣质催化裂化柴油LTAG组合工艺催化裂化装置运行分析

炼油结构调整、提质升级要求炼厂调整催化裂化工艺的加工策略，增产清洁汽油馏分并减少劣质催化裂化柴油产品。中国石化济南分公司采用MIP与LTAG工艺技术进行催化裂化装置改造，通过设计双反应器工艺流程，解决了重油催化原料与加氢后劣质柴油两种差异性原料进行高选择性裂化反应的难题。对比改造前的FDFCC工艺技术，重油MIP 与劣质催化裂化柴油LTAG组合工艺，通过精确控制LTAG原料的加氢深度实现了多产富含芳烃高辛烷值汽油的目标；装置改造后，汽油收率明显增加，汽油辛烷值显著提高，汽油中烯烃含量降低而芳烃含量明显提高；柴油十六烷值降低幅度大，油浆密度略有增加，其中副提升管LTAG油浆产率较低，对应的副分馏塔需要补充油浆才能保障油浆系统运行。

ANALYSIS OF COMBINED PROCESS OF MIP AND LTAG TECHNOLOGIES FOR RFCC OPERATION

The adjustment of refinery configuration and upgrade of oil quality requires the refinery to adjust the processing strategy of FCC process to increase clean gasoline and reduce inferior FCC LCO. Aiming at the problems of different cracking selectivity of heavy oil and hydrogenated LCO, a dual independent reactors system, which combines MIP and LTAG technologies, was designed for revamping FCC unit. More gasoline with high octane number and aromatics were produced by precisely controlling the hydrogenation depth of LTAG process. After revamping, the RON and yield of gasoline increased significantly, while lowering the olefin content and increasing aromatic content. Meanwhile, the cetane number of LCO declined and the density of slurry increased slightly. In addition, due to the reduction of LTAG auxiliary tower slurry, the supplement of oil slurry for auxiliary fractionation tower to ensure the operation of the oil slurry system was needed.