分壁塔技术在重整脱戊烷油分离过程中的应用

APPLICATION OF DIVIDING-WALL COLUMN IN SEPARATION OF PLATFORMING DEPENTANIZER BOTTOM PRODUCTS

分壁塔比传统的精馏技术投资更低,能耗更省。以某石化连续重整装置的重整脱戊烷油为原料,采用常规脱C 6塔、脱C 7塔两塔模型和分壁塔模型分别进行模拟计算。研究表明:在相同的原料和分离要求下,分壁塔重沸负荷与常规两塔相比减少约30%,年节能经济效益1441万元。同时,分壁塔系统比常规两塔系统减少7台设备,设备购置费减少了18.6%。除了设备购置费,分壁塔流程设备数量少,设备安装、土建结构、仪表等费用都低于两塔流程。通过某石化装置3年多的工业运行经验,充分验证了分壁塔技术能够达到两塔流程的分离精度要求。分壁塔容易操控,运行平稳,产品各项指标符合设计要求。

Dividing-wall column has lower investment and less energy consumption than conventional distillation technology.In this paper,the Platforming depentanizer bottom products of a petrochemical company are used as the feedstock,and the conventional de-C6 column and de-C7 column model and the dividing-wall column model are used for simulation calculations,respectively.The study shows that with the same feedstock and separation requirements,the reboiling load of dividing-wall column is reduced by about 30%compared with that of the conventional two columns,with an annual energy-saving economic benefit of 14.41 million yuan.At the same time,the dividing-wall column system has seven less equipment than the conventional two-column system,reducing the equipment purchase cost by 18.6%.In addition to equipment purchase cost,the dividing-wall column has less equipment,and the costs of equipment installation,civil structure and instrumentation are lower than those of the two-column process.More than 3 years of industrial operation experience in a petrochemical company fully verifies that dividing-wall column technology can meet the separation accuracy requirements of two-column process.Dividing-wall column has the advantages of easy control and smooth operation,and its product quality and other indicators are in line with the design requirements.