A new method for sizing mass exchange units without the singularity of the Kremser equation

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• 作者：Fraser ; Duncan M. ; Shenoy ; Uday V.
• 关键词：Mass exchanger sizing ; Kremser equation ; Mass exchanger network synthesis
• 刊名：Computers and Chemical Engineering
• 出版年：2004
• 出版时间：October 15, 2004
• 年：2004
• 卷：28
• 期：11
• 页码：2331-2335
• 全文大小：94.3 K

文摘

In this paper, we examine two different formulations of the Kremser equation for sizing mass exchange units. These formulations overcome the inherent singularity in the Kremser equation when the absorption factor A is equal to unity, by expressing the terms in the equation in a form which reduces to a ratio of two logarithmic mean values. These logarithmic mean values are then evaluated using the Underwood approach, yielding elegant expressions which give answers within 1 % of the true values except at extreme values of the system parameters. It is proposed that these expressions should be adopted for sizing mass exchangers, especially in mixed-integer non-linear programming (MINLP) solutions for mass exchange networks.