加工环烷基原料的加氢改质装置优化及长周期运行

OPTIMIZATION AND LONG-TERM OPERATION OF HYDRO-UPGRADINGUNIT FOR PROCESSING NAPHTHENIC FEEDSTOCK

中海油中海沥青股份有限公司为了提高全厂经济效益,根据1.2 Mt a加氢改质装置装填的催化剂类型,以环烷基柴油加工的反应机理为理论指导,对全厂原油构成进行优化,实现了加氢改质装置长周期稳定运行。通过调整装置操作条件、优化原油加工比例以及增设过滤设施等措施,实现了装置不同生产工况的灵活切换。优化调整后的结果表明,在已装填高柴油选择性催化剂的基础上,可以灵活切换生产2号燃料油、国Ⅵ车用柴油以及为下游精密分馏装置提供原料3种工况,同时保持柴油收率的最大化。装置长周期运行结果表明,精制催化剂失活速率为0.28℃月(1月按30 d计),改质催化剂失活速率为0.24℃月,失活速率均较低,具有良好的运行稳定性。

In order to improve the economic benefits of the whole plant,according to the type of catalyst filled in the 1.2 Mt a hydro-upgrading unit and the reaction mechanism of cycloalkyl diesel processing,the composition of the crude oil in the whole plant was optimized to achieve long-term stable operation.By adjusting the operating conditions of the unit,optimizing the crude oil processing ratio,and adding filtration facilities,the flexible switching of the unit under different production conditions was realized.The optimized results indicated that,on the basis of the loaded high diesel selectivity catalyst,it could flexibly switch 3 working conditions,such as producing No.2 fuel oil,China nationalⅥvehicle diesel and providing raw materials for downstream precision fractionation units,while keeping maximum diesel yield.The long-term operation results of the unit showed that the deactivation rate of hydrofining catalyst was 0.28℃month(a month was counted as 30 days),and that of hydroupgrading catalyst was 0.24℃month,both of which were relatively low and had good operational stability.