| 摘要 |
PROBLEM TO BE SOLVED: To provide an economizer capable of efficiently removing powder adhered to and accumulated in a heat exchange part of the economizer. SOLUTION: The economizer 40 is equipped with a heat transfer tube T arranged in a venting route 18 discharging combustion gas G1 and formed with a plurality of heat exchange parts 42 contacting with the combustion gas G1 to carry out heat exchange, and a fluid jetting member 46 formed with nozzle holes 46A, 46B jetting out fluid. The economizer is characterized in that the fluid jetting member 46 is arranged below at least one part of the heat exchange part 44, and at least the nozzle hole 46A is opened upward. COPYRIGHT: (C)2009,JPO&INPIT
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