Abstract: In order to get clean regenerated flue gas with little SO2 and PM，CNPC Guangxi Petrochemical Company built a new WGS unit for 3.5 Mt/a RFCC Unit. The WGS demonstration test shows that the SO2 and PM emissions achieve the discharge standards for environmental protection，the salty water can meet the design requirement and sewage sludge can be landfilled directly，the material balance is reasonable, the key operation parameters meet the design requirements, the energy consumption is slightly lower than the design value, the use of WGS has no effect on the catalytic cracking unit. The WGS technology has advantages of simple operation and can run for a period of long time.

Key words: RFCC, flue gas, WGS, desulfurization