| 摘要 |
PURPOSE:To remove NOx and SOx simultaneously with good efficiency in the stage of purifying waste gases contg. NOx and SOx by executing a treatment of adding gaseous ammonia to the waste gases and allowing the same to react with orthogonal fluidized catalyst beds dividedly in two stages. CONSTITUTION:Waste gases 1 contg. NOx and SOx are supplied together with gaseous ammonia 2 to the 1st orthogonal fluidized bed reactor 3, where the gases are brought in to contact with carbonaceous media moving from above to below, whereby the gases are denitrified and desulfurized. The waste gases 7 from the reactor 3 are again mixed with gaseous ammonia 8, and are supplied to the 2nd orthogonal fluidized bed reactor 9, where the gases are subjected to the denitration and desulfurization reaction similar to the previous reaction, and the clean gases are discharged. The concn. for injection of gaseous ammonia [concn. of NOx X denitration rate + concn. of SOx X desulfurization rate X (0.1-1.0)]. Since the waste gases to be treated can be denitrated and desulfurized at low temp., there is no need for prior heating of the same to temp. higher than specific temp., and the loss of the carbonaceous catalysts on account of their oxidation is less. |
