分隔壁精馏塔分离裂解汽油的模拟

Simulation of dividing-wall column for the separation of pyrolysis gasoline

提出了分离裂解汽油新工艺,用分隔壁精馏塔(DWC)替代传统工艺中的三个精馏塔。利用AspenPlus模拟软件对DWC工艺和传统精馏工艺进行了模拟,考察了回流比、分配比、侧线采出量等工艺条件对分离效果的影响,并对两种工艺进行了比较。模拟结果表明,DWC的最佳操作条件为:主塔理论板数为56块,副塔为12块板,回流比为7,液体分配比为3,气体分配比为2,同时需严格控制侧线采出流量。在此操作条件下,分隔壁精馏工艺比传统三塔精馏工艺节能26.89%。

A novel process was proposed for the separation of pyrolysis gasoline. This process used diving-wall column （DWC） to replace three distillation columns of the conventional process, and therefore reduced the equipment cost and energy consumption. The processes were simulated by Aspen Plus software. The effects of separation parameters such as reflux ratio, distribution ratio and flux of side-draw product on the separation in dividing-wall column were analyzed. The results showed that the optimum parameters were as follows： the number of main column theoretical plates of 56, the number of side column theoretical plates of 12, the main column reflux ratio of 7, the hquid distribution ratio of 3：1, and the vapor distribution ratio of 2：1, and the flux of side-draw product should be controlled strictly. Under the optimum conditions, compared with the eonventional three distillation columns process, the DWC process could reduce energy consumption by 26.89%.