OPTIMIZATION OF HEAT TRANSFER NETWORKS IN PETROLEUM REFINERIES

ABSTRACT Optimal integration of heat transfer and heat recovery networks can result in great energy savings if carried out in a refinery. This paper reviews the methods used for optimal design of these networks. It is possible to predict the minimum utility usage target from a given duty and to predict the least number of heat exchangers and the bottlenecks which could exist in the process and which might pose problems in further heat integration. Heat transfer across the bottleneck requires an extra load for heating and cooling. Thus when designing new flowsheets, we divide the problem at the bottleneck point (pinch) and design each area separately. As an example, the optimal design of a heat exchange network around a crude oil distillation column is given in details. Results indicate a better design with energy savings.