催化裂化装置采用两段提升管技术的改造及效果

为降低催化裂化汽油烯烃含量和提高轻质油收率，对0.8 Mt/a重油催化裂化装置进行了采用两段提升管反应器催化裂化技术的改造。改造中除反应沉降器和提升管反应器改动较大外，其余设备改动很小。改造后装置采用了汽油回炼方式。改造后装置的标定结果表明，两段提升管反应器与LBO-16L降烯烃催化剂配合，在保证汽油烯烃体积分数小于35%的前提下，产品分布较好，轻质油收率和柴汽比较高。但是在汽油回炼量较大（20t/h）的情况下，汽油烯烃含量才达到要求。

REVAMPING EFFECT OF FCC UNIT WITH TWO-STAGE RISER TECHNOLOGY

In order to decrease the olefin content of FCC naphtha and increase light oil yield, a 16 000 b/d RFCC unit was revamped with two-stage riser catalytic cracking technology. Large alteration was made in reaction disengager and riser reactor, and without too much change in other equipments. FCC naphtha reprocessing was adopted in the revamped unit. The evaluation result shows that by adopting the two-stage riser reactor together with LBO-16L olefin reducing catalyst, on the premise that FCC naphtha olefin content is less than 35%, the product slate is good, the light oil yield and the ratio of diesel to gasoline are higher. However, the olefin content of FCC naphtha will be reached the requirement only under the condition of a large amount reprocessing (20 t/h).