September 2005

Special Report: Refining Developments

Consider using reverse jet scrubber technology for FCC offgases

Installing this technology helped a refinery meet its air and particulate emissions

Beardemphl, S., Holly Corp.; Meyer, F. S., Wibbenmeyer, L. K., Monsanto Enviro-Chem Systems, Inc.

Refiners are being required to drastically reduce sulfur dioxide (SO2 ) and particulate emissions from fluid catalytic cracking (FCC) offgases due to imposed government regulations. Wet gas scrubbing is one of the most accepted methods for FCC offgas treatment. All wet gas scrubbers remove or "scrub" pollutants from FCC flue gas by contacting gas with a circulating liquid. Reverse jet wet scrubbers have been widely applied in the cement, metallurgical, chemical and power industries, and have been used in refinery applications since 1990. However, this technology had not been used for FCC emissions control until it was installed at the Navajo Refinery in Artesia, New Mexico, in 2003 (Fig. 1

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