| 摘要 |
PROBLEM TO BE SOLVED: To provide a sufficient soot removing effect to the deep end of an element while suppressing increase in the consumption amount of a spraying medium to a minimum, by providing supplementary nozzle holes for the support of the spraying medium being sprayed from a main nozzle, which have a smaller diameter than the main nozzle hole, on both sides of the main nozzle hole in a spraying section. SOLUTION: At the central section of the spraying section 42 of a nozzle 31, a main nozzle hole 54a having a specified diameter is provided, and at the same time, at specified locations on both sides of the main nozzle hole 43a on the spraying section 42, supplementary nozzle holes 43b for the support of a spraying medium 27 being sprayed from the main nozzle hole 43a, which have a smaller diameter than the main nozzle hole 43a, are provided. By this constitution, the expansion of the spraying medium 27 which is sprayed from the main nozzle hole 43a is suppressed, and the linear property is increased, and a sufficient soot removing effect to the deep end of an element 3 can be obtained, and at the same time, the consumption amount of the spraying medium 27 can be reduced more than the case of a conventional nozzle 31 wherein three nozzle holes of the same diameter are provided.
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