| 摘要 |
PURPOSE: To uniformalize the concentration distribution of injected gaseous ammonia on the front surface of a catalyst. CONSTITUTION: Plural main pipes 1 arranged to intersect a waste gas stream at right angle in a waste gas flow passage, plural projecting pipes projectingly provided from the side face of the main pipes and a nozzle 2 provided so as to open to face the down stream direction of the waste gas stream at the end part of each projecting pipe are provided, the distance between the center line of each nozzle 2 and the side face of the main pipe is larger than the diameter of the main pipe and the position of each nozzle 2 projecting on the section intersecting the waste gas stream at right angle is arranged so as to be in the position of each apex of plural equilateral triangles adjacent to each other. |
