| 摘要 |
PROBLEM TO BE SOLVED: To enhance the reaction rate of gaseous ammonia by appropriately replenishing gaseous ammonia into a duct in accordance with a flow velocity around the ammonia injection pipes constituting the ammonia injector. SOLUTION: A grid composed of plural ammonia injection pipes 25 each having many injection nozzles 26 is arranged in a waste gas duct to constitute an ammonia injector. The groove members 3 and 4 respectively for forming gas reservoirs 5 and 6 are arranged at small intervals on the upstream outside and/or downstream outside of each ammonia injection pipe 25 in the longitudinal direction, the inside of the injection pipe 25 is communicated with the gas reservoirs 5 and 6 through plural gas holes 7 and 8, and gaseous ammonia is sucked out from the small intervals 1 and 2 in accordance with the flow velocity around the injection pipe 25. |
