A Two-step Design Method for Shaft Work Targeting on Low-temperature Process

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• 作者：Yiqing LUO ()^a ; ^{luoyq@tju.edu.cn" class="auth_mail} ; Shengke FENG ()^a ; Changjiang SUN ()^b ; Xigang YUAN ()^a
• 关键词：exergy ; shaft work ; heat exchanger network ; cold pocket ; low-temperature process ; optimization
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：June 2014
• 年：2014
• 卷：22
• 期：6
• 页码：664-668
• 全文大小：474 K

文摘

In low-temperature processes, there are interactions between heat exchanger network (HEN) and refrigeration system. The modification on HEN of the chilling train for increasing energy recovery does not always coordinate with the minimum shaft work consumption of the corresponding refrigeration system. In this paper, a systematic approach for optimizing low-temperature system is presented through mathematical method and exergy analysis. The possibility of “pockets”, which appears as right nose section in the grand composite curve (EGCC) of the process, is first optimized. The EGCC with the pockets cutting down is designed as a separate part. A case study is used to illustrate the application of the approach for a HEN of a chilling train with propylene and ethylene refrigerant system in an ethylene production process.