October 2002

Environment

Optimize FCC flue-gas emission control—Part 2

Regenerator design plays a crucial role when limiting NOx emissions

In Part 1, the environmental regulations concerning atmospheric emissions from fluid catalytic cracking unit (FCCU) regenerators were reviewed along with technologies designed to minimize the release of particulates to atmosphere.1 Besides particulate matter, refiners must further refine control strategies to mitigate sulfur oxide (SOx) and nitrogen oxide (NOx) emissions. In Part 2, we will explore several technologies—catalytic and non-catalytic technologies—which can be applied in combinations to control these air emissions from the FCCU. FLUE GAS SCRUBBING An appropriately designed flue gas scrubbing process, such as that featured in Fig. 7, can easily meet the Refinery NSPS

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