Patent ID: 8419421

Claim:
An injection flame burner comprising: an outer tube and an inner tube provided coaxially with the outer tube; a plurality of double structure injection nozzles, each composed of the outer tube and the inner tube arranged such that hydrogen gas is ejected either from the inner tubes or from the outer tubes while oxygen gas is ejected from the other tubes; and an injection port of each of the plurality of injection nozzles located in an injection surface; wherein the plurality of injection nozzles is composed of at least one main injection nozzle that is equipped with the inner tube formed to spread toward the injection surface side in a flared shape and sub-injection nozzles, gas that is ejected from the inner tube of said at least one main injection nozzle is ejected at a pressure higher than that ejected from the sub-injection nozzles, the injection port of said at least one main injection nozzle is located at the center with respect to the injection ports of the sub-injection nozzles, and the injection ports of the sub-injection nozzles are arranged at a distance from one another around the injection port of said at least one main injection nozzle so that a flame obtained by burning the gas ejected from said at least one main injection nozzle will collide with a flame obtained by burning the gas ejected from the sub-injection nozzles.