Folded Distillation Models for Heat Pump Process Design

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FOLDED DISTILLATION MODELS FOR HEAT PUMP PROCESS DESIGN

Andrew W. Sloley
The Distillation Group, Inc.*
P.O. Box 10105
College Station, Texas 77842-0105

Daryl W. Hanson
Glitsch, Inc.
P.O. Box 660053
Dallas, Texas 75266-0053

Presented at the
IASTED Conference on Applied Modelling, Simulation and Optimization
Cancun, Mexico
June 15-17, 1995

Abstract copyright A.W. Sloley
1997

A standard distillation simulation model for a superfractionator is compared to a simulation with a "folded" model that eliminates model unit operation recycle loop convergence to minimize execution time. The folded simulation method incorporates the overhead vapor recompressor system of the heat pump inside the distillation unit operation. This brings the power of advanced convergence techniques for distillation to bear on the overall recycle problem. On an example case for the propene-propane system the execution time dropped by a factor of 18.8 when going from the standard recycle approach to the once-through folded approach. This leads to significant engineering time savings in optimizing the design of complex plants for multiple operating conditions. Additionally, the computationally efficient approach of the folded method simplifies the resource demands of real-time process optimization systems.

5 pages.
Electronic version available in Adobe Acrobat PDF format files 033.PDF 143k.

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This page updated June 1, 1999.
© 1999 The Distillation Group, Inc. All rights reserved.