Design of Crude Distillation Plants with Vacuum Units. II. Heat Exchanger Network Design

This is the second part of a two-part paper. In this part, a multiperiod heat exchanger network design model is proposed to handle two different crudes, a light crude and a heavy crude, and the results are presented. This model considers the existence of a preflash drum, which is used only in the light crude period. The model contains a topological constraint so that all periods share the same heat exchange network but not necessarily at the same temperature levels.