常减压蒸馏装置减压深拔技术改造及工艺优化

Deep-cut vacuum revamping and process optimization of atmospheric-vacuum distillation unit

针对中国石油化工股份有限公司广州分公司加工能力为8Mt/a的Ⅲ套常减压蒸馏装置存在的常压塔操作压力高、减压塔塔底渣油泵容易抽空等影响常、减压深拔的现状,采取了降低常压塔塔顶系统压力降、增加减压急冷油系统等措施。结果表明:减压渣油500℃馏出率从改造前的3.20%降低至2.67%,常压塔塔底油350℃馏出率从改造前的9.0%降低至4.3%,高价值蜡油收率提高了2.95个百分点。

Effective measures were taken such as reducing the pressure drop of the atmospheric tower overhead system, adding a vacuum quench oil system to solve the problem of high operating pressure of atmospheric tower and easy pumpdown of the vacuum tower bottom residue pump etc in the existing 160. 000 b/d atmospheric-vacuum distillation unit Ⅲ, which affects the deep cut efficiency of atmospheric-vacuum distillation. The results showed that the distillation rate of vacuum residue before 500℃ was reduced to 2.67% from 3.20% , the distillation rate of atmospheric tower bottom oil before 350 ℃ was lowered to 4.3% from 9.0%. The yield of high value VGO was raised by 2.95%.