کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
203644 460669 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A robust negative flash based on a parameterization of the tie-line field
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
A robust negative flash based on a parameterization of the tie-line field
چکیده انگلیسی

We propose a novel approach to flash calculation, with particular application to negative flash. The basis of the method is a parameterization of the tie-line field. Rather than solving the Rachford–Rice equation (or any of its variants) we solve directly for the parameters defining the tie line. For an N  -component system, our approach leads to a system of N−2N−2quadratic equations, which we solve efficiently using a Newton method. The iterative method is very robust: unlike other negative flash procedures, the solution displays continuous dependence on the overall composition, even in the transition to negative concentrations. We illustrate the properties and behavior of the proposed approach on three-component and four-component systems, and we then generalize the method to systems of N components. From the global triangular structure of the system with constant K-values, it follows that the system of N−2 quadratic equations can only have two roots. For the important case of three components, the flash calculation is explicit.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fluid Phase Equilibria - Volume 267, Issue 1, 15 May 2008, Pages 6–17
نویسندگان
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