| 摘要 |
PROBLEM TO BE SOLVED: To provide a soot blower injection tube to be disposed in a furnace of a boiler or the like for removing soot attaching to a heat transfer tube, which eliminates such a disadvantage with a conventional injection tube that a clack developed at a welding part arranged at a predetermined position in an axial direction of the injection tube of a nozzle piece which may shorten a service life of the injection tube, and decrease an availability rate of such as a boiler. SOLUTION: This soot blower injection tube comprises a welding part of the nozzle piece to be welded to a hole provided at a specified position in the axial direction of the injection tube. The welding part has an umbrella- shaped part in such a size that the welding part can be welded at an outer area of a high thermal stress part developed inside near the nozzle. This enables the welding to be performed at outer circumferential part of the umbrella-shaped part outer than the high thermal stress part, minimizing the high stress development of the welding part, decreasing clacks caused by the welding part and extending the service life of the injection tube, resulting in an improved availability rate of the boiler or the like. COPYRIGHT: (C)2003,JPO
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