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Proceedings of an International Conference on Mitigation of Heat Exchanger Fouling and Its Economic and Environmental Implications

ISSN:
1-56700-172-6 (Print)

SCHEDULING OF HEAT EXCHANGER CLEANING IN REFINERY HEAT EXCHANGER NETWORKS

F. Smaili
Department of Chemical Engineering University of Cambridge Pembroke Street Cambridge CB2 3RA, UK.

V.S. Vassiliadis
Department of Chemical Engineering University of Cambridge Pembroke Street Cambridge CB2 3RA, UK.

D. I. Wilson
Department of Chemical Engineering University of Cambridge Pembroke Street Cambridge CB2 3RA, UK.

Abstract

Fouling causes significant operating cost penalties in large heat exchanger networks, which can be reduced by cleaning fouled units. A method for generating optimal cleaning schedules in large networks, using mixed integer non-linear programming, is presented here and illustrated by case studies based on a crude oil preheat train. The problem has been formulated to include both thermal and pressure drop constraints. Schedules for three year operations are calculated, featuring linear and non-linear (asymptotic) fouling behaviour.