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Energy recovery enhancement of heat exchanger network by mixing and azeotrope formation

•The heat exchanger network is integrated with mixing and azeotrope formation considered.•Quantitative relations among mixing streams and utility consumptions are deduced.•Principles are clarified for employing mixing and azeotrope formation to enhance energy recovery.•A styrene production process i...

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Bibliographic Details
Published in:Chemical engineering science 2020-12, Vol.228, p.115992, Article 115992
Main Authors: Zhang, Di, Li, Yongfei, Sun, Huifeng, Liu, Guilian
Format: Article
Language:English
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Summary:•The heat exchanger network is integrated with mixing and azeotrope formation considered.•Quantitative relations among mixing streams and utility consumptions are deduced.•Principles are clarified for employing mixing and azeotrope formation to enhance energy recovery.•A styrene production process is studied and its heating utility consumption is reduced by 22.87%. Mixing two streams with different components and/or compositions could enhance heat recovery if they contain azeotrope-forming components. This study investigates the integration of Heat Exchanger Network (HEN) considering mixing and azeotrope formation. Two cold streams are mixed to form a minimum azeotropic mixture and vaporised. Variations in heat capacity flowrate, net heat flow, and Grand Composite Curve are analysed, and their quantitative relations and utility consumption are deduced. Principles behind mixing and azeotrope formation are clarified to enhance energy recovery. A styrene production process is studied using the proposed method. With steam condensate mixed with ethylbenzene and vaporised at the azeotropic composition, the minimum heating and cooling utility consumption can be reduced by 22.87% and 13.88%.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2020.115992