PURIFYING METHOD FOR HIGH-TEMPERATURE REDUCING GAS

摘要

PURPOSE:To simultaneously perform dust collection and desulfurization by jetting and injecting a powdery or slurry desulfurizing agent into high-temp. reducing gas contg. sulfur compd. and allowing desulfurizing reaction to be performed, trapping and recovering dust and the desulfurizing agent in a dust collector. CONSTITUTION:A powdery or slurry desulfurizing agent 2 such as iron oxide and zinc oxide is sprayed through an injection pipe 20 into high-temp. reducing gas 1 contg. sulfur compd. such as H2S and COS and desulfurizing reaction is allowed. Porous ceramic filters 12 are packed in a dust collector 11 and both dust and the desulfurizing agent contained in the gas are trapped herein and the gas is discharged as treated gas 3. When both dust and the desulfurizing agent are stuck on the filter 12 and pressure drop is increased, backwash gas 4 is introduced and dust is shaken down to the lower part of the dust collector 11 and the regenerated desulfurizing agent is discharged through the lower part 27 via a separation tank 14 and a precipitation tank 15.