4.0 Mt/a环烷基油加氢裂化装置多产重石脑油的实践

PRACTICE OF 4.0 Mt/a HYDROCRACKER FOR INCREASING HEAVY NAPHTHAPRODUCTION USING NAPHTHENE-BASE FEED

中海油惠州石化有限公司4.0 Mt/a加氢裂化装置采用RN-410C RHC-210 RHC-220催化剂级配,通过分馏系统改造进行了多产优质化工原料的产品结构升级。标定结果表明,以焦化蜡油掺入量(w)为20.16%、氮质量分数为0.1846%、密度(20℃)为0.910 g/cm^(3)的混合蜡油为原料,在入口总压力为15.18 MPa、精制段和裂化段平均温度分别为385.6℃和389.3℃、采用一次通过流程的条件下,氢耗为2.98%,重石脑油收率为35.23%,尾油收率为10.69%。石脑油、喷气燃料、柴油产品指标均在合格范围内,其中喷气燃料烟点可达30 mm,柴油十六烷指数可达72.3、多环芳烃质量分数为1%,尾油BMCI为12;装置能耗为21.91 kgOE t(1 kgOE=41.8 MJ),达到同类装置先进水平。重石脑油选择性从上周期的77.3%提高到了本周期的84.2%,表明催化剂级配及反应分区调控效果明显。

The 4.0 Mt/a hydrocracker of CNOOC Huizhou Petrochemical Company Limited was modified by using RN-410C RHC-210 RHC-220 graded catalysts and fractionation system revamping to upgrade the production of high-quality chemical feedstocks.The calibration results show that using the VGO feedstock,blended with 20.16%of CGO,with the nitrogen mass fraction of 0.1846%and a density(20℃)of 0.910 g cm^(3),under the conditions of an inlet pressure of 15.18 MPa,an average hydrotreating temperature of 385.6℃and average hydrocracking temperature of 389.3℃,the hydrogen consumption is 2.98%,heavy naphtha yield is 35.23%,and tail oil yield is 10.69%.The naphtha,jet fuel,and diesel products can meet the specification requirements.The smoke point of jet fuel can reach 30 mm,the cetane index of diesel with 1%of polycyclic aromatics,can reach 72.3,and the BMCI value of tail oil is 12.The energy consumption of the unit is 21.91 kgEO/t(1 kgOE=41.8 MJ),reaching the advanced level of similar units.The selectivity of heavy naphtha increased from 77.3%in the previous cycle to 84.2% in this cycle,indicating a significant effect of catalyst gradation and reaction zone regulation.