Abstract: In order to get clean regenerated flue gas with little SO2 and PM, CNPC Jinxi Petrochemical Company built a wet flue gas desulfurization facility for 1 Mt/a FCC Unit. The facility used WGS technology, whose process is simple and equipment investment is low. It doesn’t need to modify heat recovery boiler but can fit long term operation of FCC unit. The WGS operation results show that SO2 and PM removal rates are very high; the cleaned gas contains no alkali liquor. The SO2 and PM emissions achieve the national integrated emission standard of air pollutants（GB16297-1996 ）. The facility has no bad effect on FCC unit and flue gas turbine; the flue gas pressure drop <0; the facility produce a little waste water that reaches the integrated wastewater discharge standard (DB21.1627—2008) of Liaoning province.

Key words: FCC flue gas, WGS flue gas wet desulfurization, SO2, particulate matter, waste water