Recycle/reuse networks are commonly used in industrial facilities to conserve
natural resources, reduce environmental impact, and improve process economics. The
design of these networks is a challenging task because of the numerous possibilities of
assigning stream (process sources) to units that may potentially employ them (process
sinks). Additionally, several fresh streams with different qualities and costs may be used
to supplement the recycle of process streams. The selection of the type and flow of these
fresh resources is an important step in the design of the recycle/reuse networks. This
work introduces systematic approaches to address two new categories in the design of
recycle/reuse networks:
(a) The incorporation of thermal effects in the network. Two new aspects are
introduced: heat of mixing of process sources and temperature constraints imposed on
the feed to the process sinks
iv
(b) Dealing with variation in process sources. Two types of source variability
are addressed: flowrate and composition
For networks with thermal effects, an assignment optimization formulation is
developed. Depending on the functional form of the heat of mixing, the formulation may
be a linear or a nonlinear program. The solution of this program provides optimum
flowrates of the fresh streams as well as the segregation, mixing, and allocation of the
process sources to sinks. For networks with variable sources, a computer code is
developed to solve the problem. It is based on discretizing the search space and using the
concept of "floating pinch" to insure solution feasibility and optimal targets. Case
studies are solved to illustrate the applicability of the new approaches.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2009-08-912 |
| Date | 2009 August 1900 |
| Creators | Zavala Oseguera, Jose Guadalupe |
| Contributors | El-Halwagi, Mahmoud M. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | application/pdf |
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