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精馏是石油化工能耗最大的单元操作之一,因此对其过程的节能研究非常重要。本文利用Aspen Plus化工模拟软件中的RADFRAC模块和PENG-ROB热力学计算模型,系统模拟了多效精馏顺流(DQF、IQF)、逆流(DQB、IQB)及常规精馏(DQ、IQ)的烃类混合物异丁烷/正丁烷/正己烷的分离。根据各组分的分离要求,通过灵敏度分析优化各工艺参数;同时比较了各精馏构造的有效能损失和热力学效率,并计算了它们的年度总费用(TAC)。结果表明:与间接精馏方案IQ相比,精馏方案IQF、DQB、DQ分别节能20.6%、16.0%、8.4%;热力学效率方面,多效精馏IQF为19.6%,DQB22.2%,普遍比常规精馏的DQ10.0%、IQ10.3%要高;至于年度总费用(TAC),相比于IQ,DQB多耗资12.1%,而IQF、DQ少耗资9.0%和8.7%。综合节能效果、热力学效率、年度总费用得知,IQF这种多效精馏方案最优。
Distillation is one of the most energy-intensive unit operations in the petrochemical industry, so energy-saving studies of its processes are important. In this paper, RADFRAC module and PENG-ROB thermodynamic calculation model in Aspen Plus chemical simulation software are used to simulate the effects of DQF, IQF, IQB and DQ (IQ) Separation of isobutane / n-butane / n-hexane from hydrocarbon mixtures. According to the separation requirements of each component, the process parameters were optimized by sensitivity analysis. The effective energy loss and thermodynamic efficiency of each distillation structure were compared and their annual total cost (TAC) was calculated. The results show that IQF, DQB and DQ are 20.6%, 16.0% and 8.4% lower than the indirect distillation scheme IQ respectively. In terms of thermodynamic efficiency, multi-effect distillation IQF is 19.6%, DQB 22.2%, and common DQ10.0% and IQ10.3% were higher than those of conventional distillation. For TAC, DQB cost 12.1% more than IQ, while IQF and DQ cost 9.0% and 8.7% less. Comprehensive energy-saving effect, thermodynamic efficiency, the total annual cost that, IQF this multi-effect distillation program optimal.