连续液相柴油加氢装置长周期运行和效果分析

Long-term operation of continuous liquid-phase diesel hydrotreating unit and analysis

介绍了中国石油化工股份有限公司安庆分公司新建2.2 Mt/a连续液相柴油加氢装置生产国Ⅳ车用柴油的运行情况。装置运行27个月能够稳定生产国Ⅳ车用柴油,降低装置负荷后可生产国Ⅴ车用柴油。运行结果表明:1反应比较缓和,由于循环油的作用,最快提温速率为6℃/h,不存在飞温的问题;2该技术液相物料是连续相,在高效反应器内构件的共同作用下,床层径向温差最大不超过1.5℃,催化剂的平均提温速率为0.5℃/月,按目前原料硫质量分数为0.31%预测,RS-2000催化剂第一周期可以累计运行55个月;3生产国Ⅳ车用柴油时装置能耗为195.86 MJ/t,低于传统的滴流床加氢的能耗。另外对循环比的选择和分馏塔单塔流程提出了一些改进建议,建议适当放宽进料泵的设计温度,增大反应加热炉的热负荷,并在现有分馏塔上游增设汽提塔确保产品柴油腐蚀合格。

The operation of a grass-root continuous liquid-phase diesel hydrotreating unit with a capacity of 2. 2 MM TPY for the production of Guo-Ⅳ specification motor diesel in SINOPEC Anqing Company is introduced. The unit has been operating smoothly and stably for 27 months producing Guo-Ⅳ specification motor diesel and Guo-Ⅴ specification motor diesel at a lower operating capacity. The operation shows that：（ 1） The hydrotreating reaction is mild,the greatest temperature rise velocity is 6 ℃ / h because of the effect of recycle oil and there is no temperature run-away;（ 2） In this process,the liquid effluent is of continuous phase. Under the common effect of high-efficiency reactor internals,the maximum radial temperature difference is no higher than 1. 5 ℃ and the average temperature rise rate of catalyst is 0. 5 ℃ / Month. It is predicted that the first operation cycle of RS-2000 catalyst is 55 months based upon 0. 31% sulfur in the feedstock;（ 3） During the operation of producing Guo-Ⅳ specification diesel,the unit energy consumption is 195. 86 MJ / t,which is lower than that of trickle bed hydrotreating process. In addition,the recommendations for the selection of recycle ratio and single process of fractionators are proposed. It is also proposed to appropriately increase the design temperature of feed pump and the heat duty of reactor heater,and install an additional stripper up-stream of existing fractionators to ensure that the corrosivity of product diesel is within the specifications.