| 摘要 |
PROBLEM TO BE SOLVED: To realize a flame having the shape that becomes bold from the neighbourhood of a tip end of a burner. SOLUTION: A powder melting burner 10 comprises a gas fuel nozzle 12 for injecting a gas fuel such as town gas from its center toward an outer periphery, a primary combustion assist gas nozzle 14 for injecting primary combustion assist gas employing oxygen as a chief ingredient, and a powder nozzle 16 for injecting powder together with carrying gas and a secondary combustion assist gas nozzle 18 for injecting secondary combustion assist gas employing oxygen as a chief ingredient, all being arranged in this order concentrically. A spacer 26 is concentrically disposed inside the gas fuel nozzle 12, and a nozzle hole 12a opened at a tip end of the gas fuel nozzle 12 is set to be annular. More specifically, a gas fuel is injected from the nozzle hole 12a of the gas fuel nozzle 12 annularly.
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