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Received March 10, 2010
Accepted June 16, 2010
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Simulation of mass exchange networks using modified genetic algorithms
1Department of Chemical Engineering, Kasetsart University, Bangkok 10900, Thailand 2National Center of Excellence for Petroleum, Petrochemicals, and Advanced Materials, Pathumwan, Bangkok 10330, Thailand 3Department of Chemical Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
fengtcs@hotmail.com
Korean Journal of Chemical Engineering, February 2011, 28(2), 332-341(10), 10.1007/s11814-010-0360-y
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Abstract
The optimum water usage network leads to both a minimum of freshwater consumption and a minimum of generated wastewater. This work is to develop a mass-exchange networks (MENs) module for a minimum freshwater usage target. This module works as an interface to retrieve supplemental data of chemical processes from a process simulator and to communicate this to the genetic algorithm optimizer. A reuse system and a regeneration/recyclingsystem with a single contaminant are considered as approaches for freshwater minimization. In the formulated model, as mixed integer nonlinear programming (MINLP), all of the variables are divided into independent and dependent variables. The values of independent variables come from randomization,whereas the values of dependent variables come from simultaneous solutions of a set of equality constraints after assigning the values of independent variables. This method is applied to the steps of initialization, crossover and mutation. The MENs module is validated with a tricresylphosphate process consisting of five unit operations. Water is used to remove a fixed content of cresol. From the result, the module gives a reliable solution for freshwater minimization, which can satisfy mass balance and constraints. The results show that reuse and regeneration/recycling strategies can reduce freshwater consumption, including wastewater generated. Reuse cannot decrease the mass load of the contaminant, while regeneration /recycling can. In addition, regeneration requires less freshwater than the reuse process.
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