July 2004

Extra Report: Heat Transfer

Direct heat recovery of a cogeneration unit saves utilities and reduces emissions

Other benefits include improved refinery onstream time and reduced heater fouling/ coking

Goudappel, E., Sentjens, J., Jacobs Consultancy Nederland B.V.

Refineries are faced with drivers pushing their performance to less emissions and higher utility efficiency. Direct heat recovery of a cogeneration unit, by means of a heat recovery unit (HRU), maximizes the integration potential, resulting in reduced emissions and utility savings. Compared to repowering fired heaters or traditional cogeneration, HRU/HRSG cogeneration saves additional energy, with appropriate emissions reduction, and an improved energy intensity index. Other benefits include improving the refinery's onstream time, reducing fouling/ coking and possibly debottlenecking the refinery unit. Table 1 provides an overview that also includes a repowering option.

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