循环比对塔河常压渣油延迟焦化工艺过程的影响

以塔河常压渣油为原料,在中国石化炼化工程(集团)股份有限公司洛阳技术研发中心开发的在线循环延迟焦化中型试验装置上考察了循环比对其产品分布和产品性质的影响。结果表明:当循环比由0.92降低到0.39时,气体和焦炭的产率分别降低了1.71和2.57百分点,而液体产品的收率则增加了4.17百分点,液体产品收率的增加主要表现在焦化蜡油收率增加了8.97百分点;降低循环比后焦化蜡油的性质变差,密度(20℃)由918.0 kg/cm~3上升到938.3 kg/cm~3,残炭由0.03%增加到0.25%,95%馏出温度由390℃提高到463℃,尽管这会增加其加氢精制的难度,但仍可作为加氢处理工艺的掺兑原料。

INFLUENCE OF RECYCLE RATIO ON DELAYED COKING OF TAHE ATMOSPHERIC RESIDUE

The influence of cycle ratio on product distribution and properties of delayed coking process of Tahe atmospheric residue (Tahe AR) was studied in a pilot plant designed by R&D Center of Engineering and Technology of Sinopec Engineering (Group) Co., LTD. The results show that when the cycle ratio decreases from 0.92 to 0.39, the yields of gas and coke are reduced 1.71 and 2.57 percent points, however the yield of liquid product increases 4.17 percent points that benefit from the yield of coker gas oil (CGO) which increases 8.97 percent points. The reduction of the cycle ratio results in poor quality of CGO. Its density increases from 0.918 0 g/cm3 to 0.938 3 g/cm3, carbon residue enhances from 0.03% to 0.25%, and the temperature of 95% of vacuum distillation increases from 390 ℃ to 463 ℃. The CGO can be used as a component of mixed feed for hydrotreating process, though the difficulty of hydrotreating is enhanced.