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 optimiza-tion 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,un-der 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%,suc-cessively,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 calibration value.%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.
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