Abstract: The temperature of flue gas from the rotary kiln is about 180 ℃ to 220 ℃,and the flue gas contains pollutants such as sulfur dioxide and dust.In view of the environmental pollution caused by the flue gas from the kiln tail,an efficient sodium bicarbonate dry powder spray SDS dry desulfurization and dust removal system is equipped.This paper describes the principle,process and influencing factors of SDS desulfurization technology,and explores the removal effect of SO2 and dust from flue gas of calcium magnesiun sand rotary kiln in a project.The results show that the flue gas can meet the requirements of ultra-low emission,that is,the emission concentration of sulfur dioxide belows 35 mg/m3,the emission concentration of dust belows 10 mg/m3.After the project is put into operation,the main component of desulfurization by-product can be recycled as cement additive.The technology has been successfully applied to other flue gas desulfurization projects of rotary kiln,coke oven and cement kiln,and achieved 

Key words: Rotary kiln, SDS dry desulfurization, Bag filter, Ultra-low emission