Patent ID: 8646394
Filing Date: 2014-02-11
Classification: F23C,F23D

Abstract:
1. A burner, comprising a burner throat installed on a furnace wall, a nozzle main unit installed along the central axis of said burner throat, and a secondary air regulator installed at a forward end of said nozzle main unit and for supplying secondary air for combustion toward said burner throat, wherein said secondary air regulator comprises: a cylindrical space which surrounds a forward end of said nozzle main unit and is communicated with the burner throat; and a first adjusting means for supplying a part of the secondary air as a straight axial flow; and a second adjusting means for supplying the remaining secondary air by giving a swirling degree, wherein said cylindrical space comprises outer and inner peripheral portions where an outer peripheral surface is open and the outer and inner peripheral portions are a continuous space, and an end plate is provided on an end surface on opposite side of said cylindrical space; said second adjusting means comprises a partition plate for partitioning said outer peripheral portion in an axial direction into a plurality of small cylindrical spaces, and air vanes are installed at a predetermined distance along a circumferential direction for each of said small cylindrical spaces, a sliding damper surrounding said cylindrical space and being slidable in an axial direction, and a second driving means to make said sliding damper slide, wherein said sliding damper comprises at least three cylindrical members which can be stacked together, each of said cylindrical members can slide independently from each other, and said cylindrical space can be opened at an arbitrary position and with an arbitrary width; and said first adjusting means installed on said end plate comprises holes communicating with said inner peripheral portion, and a rotary damper being capable to totally close said hole and capable to adjust opening of said hole, and a first driving means for rotating said rotary damper, wherein swirling secondary air, said swirling provided by said air vanes and flowing into said inner peripheral portion, and secondary air from axial direction, flowing into said inner peripheral portion through said holes, are mixed in said inner peripheral portion and secondary air comprising the swirling degree resulting from mixing swirling and axial flow is supplied to said burner throat.