进料组成对中部蒸汽压缩两段式精馏塔节能与经济效益的影响

Influence of feed compositions on energy-saving and economic benefit of the novel middle vapor recompression distillation column

提出一种中部蒸汽压缩两段式新型精馏塔,并以丙烯和丙烷分离过程为例,对中部蒸汽压缩两段式精馏塔与常规精馏塔的性能进行比较。通过使用Aspen Plus模拟软件对流程建模及优化,探讨了丙烯和丙烷在不同配比进料条件情况下对中部蒸汽压缩两段式精馏塔的节能效果、全局有效能损失和经济效益的影响。结果发现,中部蒸汽压缩两段式精馏塔相比于常规精馏塔有着良好的节能效果,在丙烯和丙烷比例为3∶1时节能效果最为显著。中部蒸汽压缩两段式精馏塔比常规精馏塔全局有效能损失明显减少,并且受进料组成配比的影响不大。在经济投资方面,中部蒸汽压缩两段式精馏塔有着良好的经济效益,最后的年总投资节省率受进料组成配比的影响不大。说明该中部蒸汽压缩两段式精馏塔在进料组成配比上具有良好的适应性。

In this study,a novel middle vapor recompression distillation column(MVRC)was proposed and compared with the conventional distillation column(CD).Meanwhile,their performance was investigated by the separation of the propylene and propane.Process modeling and optimization were realized by using the Aspen Plus simulation software,and the energy-saving,overall exergy loss,and economic benefits were discussed according to different ratios of propylene to propane.The results show that the MVRC has good energy-saving effect compared with CD,especially,it is the most significant when the ratio of propylene to propane is 3∶1.The MVRC has a significant overall exergy loss reduction compared with CD,and almost unaffected by the different ratios of propylene to propane in the feed.In terms of economic investment,the large economic benefit is obtained in the MVRC and the total annual investment saving rate is affected little by the feed composition ratio.It shows that the middle vapor recompression distillation column has good adaptability in feed composition ratio.