喷气燃料馏分进催化裂化LTAG喷嘴回炼的工业实践

在中国石化石家庄炼化分公司3号催化裂化装置上考察了喷气燃料馏分进入提升管反应器的LTAG喷嘴回炼对产品分布、产品性质的影响。结果表明：在催化裂化装置重油进料量、进料组成及主要操作条件维持稳定的前提下，喷气燃料馏分回炼后，干气、液化气、汽油产率上升，柴油、油浆、焦炭产率下降；所得液化气产品的（C₃＋C₄）烷烃含量上升，（C₃＋C₄）烯烃含量下降；在保持重油进料量为210 t/h左右的情况下，与没有回炼的空白工况相比，喷气燃料回炼量分别为11.2 t/h和21.1 t/h的两种工况下，所得产品汽油的芳烃体积分数分别下降0.2百分点和0.5百分点，苯体积分数分别上升0.05百分点和0.07百分点，研究法辛烷值（RON）分别下降0.2和0.6。

INDUSTRIAL PRACTICE OF RECYCLE REFINING KEROSENE FRACTION THROUGH LTAG NOZZLES IN FCC UNIT

The effects of rerefining of kerosene fraction injected through LTAG nozzle into FCC unit on product distribution and product properties were investigated in SINOPEC Shijiazhuang Refining and Chemical Company.The results show that the yields of dry gas,LPG and gasoline are increased,the feed quantity,feed composition and main operating conditions of FCC unit are kept stable,and the yields of diesel,slurry and coke are decreased after the rerefining jet fuel fraction.The(C₃+C₄)alkane content of the LPG product was increased,(C₃+C₄)olefin content was decreased,when the feed amount of heavy oil was kept at about 210 t/h,compared with the blank working condition without recycle.The aromatics volume fraction of the product gasoline was decreased by 0.2 percentage point and 0.5 percentage point under the conditions of rerefining kerosene fraction 11.2 t/h and 21.1 t/h,respectively;the volume fraction of benzene was increased by 0.05 percentage point and 0.07 percentage point,respectively;and RON was decreased by 0.2 and 0.6,respectively.