| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain variations in an injection quantity of a liquid reducing agent or its precursor injected from respective injection holes, in a reducing agent injection nozzle for injecting the liquid reducing agent or its precursor into an exhaust pipe together with air for reducing nitrogen oxides in exhaust gas. <P>SOLUTION: This reducing agent injection nozzle includes a bending part in the middle, and is extended into the exhaust pipe. The injection holes are formed in two rows in the axial direction of a tip part 304, positions of the injection holes are mutually dislocated in the peripheral direction between the respective rows, and the injection holes are arranged so as to become symmetrical angular positions with a plane including the axis of the reducing agent injection nozzle as a boundary. Here, among the injection holes 301a-301h, the injection holes 301d and 301e nearest to the bending outside are formed in a small diameter, and among the injection holes 301c and 301f nearer in the next place to the bending outside, the injection hole 301c nearer to the bending part is formed in a small diameter, and the other injection holes are formed in a large diameter. <P>COPYRIGHT: (C)2013,JPO&INPIT |
