November 2005

Heat Transfer

Solving hydraulic problems in crude preheat train networks

Heat transfer and hydraulic problems need to be considered simultaneously

Yahyaabadi, R., Esfahan Oil Refining Co.

Crude preheat trains in crude distillation units usually face some common problems. Many are caused by increasing feed while others are created by new specifications or crude quality. Some alternatives for solving the main problems are discussed. The preheat train in crude distillation units (CDUs) is a network of heat exchangers that transfer heat from products, refluxes etc., to the unit feed (crude). The amount of transferred heat (or preheating) is determined by economic considerations. This is a trade-off between the utility and investment costs. In the utility costs, both hot and cold utility are considered. For investment costs, both heat transfer surface area (heat excha

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