| abstract |
The invention discloses an ammonia injection grid for an SCR (selective catalytic reduction) denitration system, wherein adjacent branch pipe assemblies on the ammonia injection grid are arranged in a staggered manner, the branch pipe assemblies on the same ammonia injection grid are arranged according to the characteristic that the flow rate of flue gas in the middle is large and the flow rate of flue gas around the branch pipe assemblies on the same cross section is small, the branch pipe assemblies on the ammonia injection grid are arranged in a layered manner with the middle higher than the periphery, the effective area for spraying ammonia gas is favorably enlarged, the reaction between the ammonia gas and NOX in the flue gas is more uniform, a sharp upper cone is arranged on a nozzle of each branch pipe assembly, the upper collapsed large dust can be effectively crushed, the dust is not easily deposited due to the smooth outer surface design of the upper cone, transverse blades and longitudinal blades are arranged on a lower cone, the ammonia gas flow is changed from vertical X Mixing effect, in addition, of telescopic rod and inferior vertebral bodyUnder the effect, can adjust the ammonia flow of branch pipe subassembly export and effectively avoid the nozzle deposition to block up. |