Abstract: To treat the blue smoke plume of FCCU of CNOOC Huizhou Petrochemicals Company, the RFS sulfur transfer additive were used according to the properties of FCCU and smoke. The changes of sulfur distribution, SOx concentration, soot concentration, alkali quantity and dissolved solids content before and after the addition of sulfur transfer additive as well as the economic accounting were compared. The results showed that the sulfur transfer additive can effectively reduce SOx content in flue gas at inlet of scrubber in 18 hours and the blue smoke of the outlet gas is gradually eliminated. Most of the sulfur is transferred into dry gas, and the sulfur content in LPG and acidic water is decreased. When the sulfur transfer additive in the catalyst inventory reaches 2.56%, much lower sulfur content in flue gas at outlet of scrubber can be obtained, SO2 concentration is below 50 mg/m3, SO3 concentration is less than 20 mg/m3, alkali consumption for wet desulfurization is reduced by 90%, and reduction of soluble solids in the effluent waste water is 86.3%, and the effluent gas smoke concentration decreases by 64.3%, the operation cost is reduced by 1.3437 million Yuan/a.

Key words: sulfur transfer additive, FCC, blue smoke plume, wet desulfurization process, scrubber