LTAG技术在重油催化裂化装置的工业应用

催化裂化柴油(LCO)十六烷值低、芳烃含量高,性质较差。随着柴油需求持续低迷,压减LCO成为各炼油厂主要的攻关方向。LTAG技术是中国石化石油化工科学研究院近年开发的将催化裂化劣质柴油转化为高辛烷值汽油或轻质芳烃的新技术。该技术利用加氢单元和催化裂化单元组合,将LCO馏分先加氢再进行催化裂化,通过设计加氢LCO转化区同时优化匹配加氢和催化裂化的工艺参数等,实现最大化生产高辛烷值汽油。为压减柴油产量、多产高辛烷值汽油组分,中国石化北京燕山分公司2.0 Mt/a重油催化裂化装置采用LTAG技术进行改造,加氢单元利旧原润滑油加氢处理装置。LTAG技术投用后,汽油收率由43.2%提高到51.8%,柴油收率由20.5%降低至5.9%,液化气收率由17.5%提高到21.5%,干气收率上升0.9百分点,油浆收率增加1.5百分点,焦炭产率降低0.4百分点;汽油中苯质量分数由1.00%提高到1.65%,芳烃质量分数由34.11%提高至38.36%,研究法辛烷值提高2个单位;大幅度压减了该公司的催化裂化柴油库存,缓解了柴油出厂困难的问题。

INDUSTRIAL APPLICATION OF LTAG TECHNOLOGY AT RFCC UNIT

As demand for diesel continues to slump, the reduction of LCO becomes the major concern for oil refineries. LTAG（LCO To Aromatics and Gasoline）is the technology developed by RIPP to convert LCO into high octane gasoline or light aromatics, where the technical parameters of hydrogenation and catalytic cracking are comprehensive considered and optimized to maximize the production of high octane gasoline. To use LTAG technology, the 2.0Mt/a RFCC unit of Yansan refinery was revamped, and the original lubricating oil hydrogenation device was used as LCO hydrotreating unit. As a result, the gasoline yield is increased from 43.2% to 51.8%, the yield of diesel oil is decreased from 20.5% to 5.9%, the LPG yield is increased from 17.5% to 21.5%, the yields of dry gas and slurry are increased by 0.9 and 1.5 percentage points, respectively, while the coke make is lowered by 0.4 percentage points. The benzene content in gasoline is raised from 1.00% to 1.65%, the aromatics mass content is increased to 38.36% from 34.11%. The RON is increased by 2 units. The adoption of LTAG greatly reduces the amount of LCO output for the refinery.