催化裂化装置主分馏塔模拟及应用

Simulation and application for main fractionator of fluid catalytic cracking unit

利用Aspen Plus流程模拟软件,选择Petro Frac模块和GS热力学计算方法,建立了中国石油独山子石化公司80万t/a催化裂化装置主分馏塔的工艺流程模拟模型,并进行了分离精度的模拟优化研究。结果表明:所建模型精确,模拟值与实际生产标定值基本吻合;经过模拟优化,在塔顶循环、中段循环、油浆循环取热比例依次为25.0%,18.3%,56.7%的取热条件下,粗汽油终馏点为201.4℃,柴油初馏点为185.3℃,汽柴油馏程重叠温度为16.1℃,比标定值减小了12.9个单位。

The process flowsheet simulation model of main fractionator was established with Aspen Plus software, Petro Frac module and GS hermodynamic calculation method, in a 0. 8 Mt/a fluid catalytic cracking （ FCC ） unit in Dushanzi Petrochemical Company, PetroChina, and the simulated optimization of separation accuracy was studied. The results showed that the model was accurate, the simulation value and actual production calibration value were basically matched. After simulated optimization, under the conditions of the overhead, middle part and slurry circulation heat removing ratio of the main fractionator was 25.0% , 18.3% and 56.7% , successively, the final boiling point of naphtha was 201.4 ℃, the initial boiling point of diesel was 185.3 ℃,the overlapping temperature of distillation range between gasoline and diesel oil was 16.1 ℃, and it reduced by 12.9 units than the ealibration value.