Abstract:Integrated technology of dedusting, desulfurization and denitrification is developed for metallurgy flue gas. Morphology of ceramic tube was characterized by SEM and XRD. Effect of pore forming materials on performance of ceramic composite membrane was investigated. The results show that the inner layer of microporous ceramic composite membrane is a support membrane with larger particle size while the surface layer of microporous ceramic is a separation membrane with smaller particle size. Pores with regular shape appear on the surface layer, which is favorable to filter dust and flue gas. With the increase of pore-forming content, apparent porosity rises significantly, while bulk density and compressive strength drop. Microporous ceramic composite membrane possesses well thermal shock and acid and alkali resistance at 600 ℃. Ammonia-free catalytic of desulfurization and denitrification technology is applied to solve emission reduction for high temperature gas in one coking plant, emission concentration of SO2 drops from 200~300 mg/m3 to 0.2~0.5 mg/m3 and desulfurization rate is 99% above. Emission concentration of NOx drops from 800~1 200 mg/m3 to 80~180 mg/m3 and denitrification rate is 50%~88%.