direct heat recovery of a on unit saves utilities and reduces emissions[1]

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Direct heat recovery of a cogeneration unit saves utilities and reduces emissions Other benefits include improved refinery onstream time and reduced heater fouling/ coking J. SENTJENS and E. GOUDAPPEL, Jacobs Consultancy Nederland B.V., Leiden, The Netherlands 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. Table 1. Various crude heating options A comparison: Conventional fired heater Repowering fired heater HRU/HRSG cogeneration Energy savings Reference Approx. 5–10% Approx. 10–20% Upstream time Reference No improvement Improved Capacity increase Reference No improvement* Possible** * Capacity can even decrease due to limited gas flow through the fired heater. ** A capacity increase is possible if the fired heater represents the bottleneck of the refinery unit. HRU/HRSG cogeneration. In traditional cogeneration, heat is recovered into a heat recovery steam generator (HRSG). However, opportunities also exist to recover the heat directly into a process in an HRU, provided there is an appropriate temperature match. Such is the case with most fired heaters in a refinery.

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