Optimal Design and Scheduling of Unsteady State Material Recovery Networks

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Title: Optimal Design and Scheduling of Unsteady State Material Recovery Networks
Author: Rabie, Arwa H.
Abstract: This research developed novel methodologies to achieve cost effective solutions to overcome many of the difficulties associated with unsteady state material recovery network synthesis . The work focuses on the development of three different methodologies : the first is a hierarchical multi -step methodology developed for the design and scheduling of batch water (material of interest ) recycle networks . A new source - double tank -sink arrangement is introduced to overcome the limitation of samecycle assignment by permitting sources to be optimally recycled within the same batch cycle and /or storing and recycling sources to sinks in the following batch cycle . The problem is solved in interconnected stages . First , network targets such as minimum fresh water consumption and minimum waste water discharge are identified ahead of network design . Once design targets have been identified , an iterative procedure is followed to tradeoff fixed and operating cost to achieve a network design which has the minimum total annualized cost (TAC ) . The second developed methodology is a one -step simultaneous approach to design and schedule cost -effective batch water recycle networks . A new source -tank -sink representation is developed to embed potential configurations of interest for design and scheduling . As a result , water may be assigned from sources to sinks within the same cycle (with or without a storage tank ) and in two subsequent cycles using a double tank arrangement . A mathematical formulation is developed to determine the network design and sufficient information on the scheduling of the network with the minimum TAC in one step . The third methodolgy this research developed is a systematic procedure to schedule the operation of an unsteady state material recovery network . The network has a set design and receives a number of feedstocks (sources ) that are to be processed into higher value /quality products . The sources may be stored in tanks , mixed , and /or intercepted in separation devices to produce the desired products while maximizing profits and meeting all process constraints . The developed systematic procedure includes mathematical formulations that allow available sources to be stored , mixed , intercepted and determine the optimal scheduling scheme over time period ? ?with the objective of maximizing total annualized profit of the network .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2008 -12 -126
Date: 2010-01-14


Optimal Design and Scheduling of Unsteady State Material Recovery Networks. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2008 -12 -126 .

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