Synthesis of Complex Thermally Coupled Distillation Systems Including Divided Wall Columns

被引:58
作者
Caballero, Jose A. [1 ]
Grossmann, Ignacio E. [2 ]
机构
[1] Univ Alicante, Dept Chem Engn, E-03080 Alicante, Spain
[2] Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA
关键词
distillation; thermally coupled distillation; mixed integer nonlinear programming problem; divided wall column; superstructure optimization; disjunctive programming problem; MINIMUM ENERGY-CONSUMPTION; MULTICOMPONENT DISTILLATION; MIXED-INTEGER; CONFIGURATIONS; OPTIMIZATION; DESIGN; SEQUENCES; ALGORITHM;
D O I
10.1002/aic.13912
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The design of thermally coupled distillation sequences explicitly including the possibility of divided wall columns (DWC) is described. A DWC with a single wall can be considered thermodynamically equivalent to a fully thermally coupled (FTC) subsystem formed by three separation tasks (a Petlyuk configuration in the case of three-component mixtures). It is shown how to systematically identify all the sequences of separation tasks that can produce configurations that include at least a DWC. Feasible sequences that explicitly include DWCs are enforced through a set of logical relationships in terms of Boolean variables. These logical relationships include as feasible alternatives from conventional columns (each column must have a condenser and a reboiler) to FTC systems (only one reboiler and one condenser in the entire system). A comprehensive disjunctive programming formulation for finding the optimal solution is presented. The model is based on the Fenske, Underwood Gilliland equations. However, the disjunctive formulation allows easily the use of any other shortcut, aggregated or even rigorous model without modifying much the structure of the model. Two illustrative examples illustrate the procedure. (C) 2012 American Institute of Chemical Engineers AIChE J, 59: 1139-1159, 2013
引用
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页码:1139 / 1159
页数:21
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