连续催化重整装置C_(4)/C_(5)分离塔模拟优化

SIMULATION AND OPTIMIZATION OF C_(4)/C_(5) FRACTIONATING COLUMN FOR CONTINUIOUS REFORMING UNIT

应用Aspen HYSYS软件对中国石化洛阳分公司1.2 Mt/a连续催化重整装置C_(4)/C_(5)分离塔(T202)进行流程模拟,得到了与T202实际操作接近的理想模型。通过模型对塔底温度和进料温度进行优化,并考察塔底温度对塔底化工轻油蒸气压的影响,以及进料温度对塔板水力学操作点的影响。结果表明:T202塔底温度由135.5℃提高至138.5℃,塔底化工轻油蒸气压(37.8℃)由96.71 kPa降低至88.76 kPa,从而可以停用化工轻油正戊烷/异戊烷分离塔,节约运行成本450万元a;T202进料温度提高至102℃,所有塔板均未漏液或液泛,塔板液相量介于最大溢流强度和最小溢流强度之间,塔底油中异戊烷体积分数降低1.25百分点,塔底油蒸气压降低0.81 kPa,燃料和动力消耗并未增加,运行成本仅增加2万元a。

Aspen HYSYS software was used to simulate the process of C_(4)/C_(5) fractionating column(T202)for 1.2 Mt a continuous reforming unit in SINOPEC Luoyang Company.The ideal model which was close to the actual operation of the device was obtained.The bottom temperature and feed temperature were optimized by the model.The influence of bottom temperature on the vapor pressure of chemical light oil and the effect of feed temperature on the hydraulic operating point of the tray were investigated.The results showed that with the increase of bottom temperature of T202 from 135.5℃ to 138.5℃,the vapor pressure of chemical light oil at the bottom of the column decreased from 96.71 kPa to 88.76 kPa,and the operating cost was saved by 4.5 million yuan per year as the chemical light oil fractionating column could be discontinued.With the increase of feed temperature to 102℃,all plate hydraulics operation points were in the optimum operation area,and the separation accuracy of the column was improved.