Improving the Performance of Heat Pump-Assisted Azeotropic Dividing Wall Distillation

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• 作者：Rui Li ; Qing Ye ; Xiaomeng Suo ; Xin Dai ; Hao Yu ; Shenyao Feng ; Hui Xia
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：55
• 期：22
• 页码：6454-6464
• 全文大小：655K
• 年卷期：0
• ISSN：1520-5045

文摘

In this work, three vapor recompression heat pump (VRHP) models are designed for the azeotropic dividing-wall column (A-DWC) system to study the energy-saving effect. During the determination of these three models, how the top stream pipeline designs affect the energy consumption is discussed. As adding a preheater can cut down compressor pressure ratio and splitting top stream can decrease the feed flow of the compressor, all these methods can obviously help reduce compressor work for the process. Evaluation results show that the VRHP A-DWC systems have a better performance in energy consumption and environmental sustainability. Especially for Model 3, the savings of total operating cost (TOC) is 47.77% and that of the total annual cost (TAC) is 32.22%, compared with the conventional two-column azeotropic system. CO₂ emissions in the process of model 3 can be reduced by 63.79%, and the thermodynamic efficiency increased to 22.64%.