August 2006

Refining Developments

Rethink placement of preflash drum in crude preheat train network

Strategic location of the preflash drum not only resolves network problems, but, in some cases, reduces operating costs

Yahyaabadi, R., Esfahan Oil Refining Co.

Many refineries use preflash drums within the preheat train networks. Often, these systems experience problems in the heat exchanger network. In some cases, these problems can reduce unit throughput and, in the worst case scenario, require unit shutdown for cleaning (mechanical or chemical) or other mandatory maintenance. Descriptions of these problems are well published.1 In a preheat train heat exchanger network, hydraulic and heat transfer are related; so, both should be considered simultaneously.1 Otherwise, a reduction in heat transfer and an increase in network pressure drop could cause a short runlength. Reducing operating expenses (such as lowering fuel consumption) for an existi

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