Patent ID: 9599335
Date: 2017-03-21
CPC Classifications: F23C,F23D,F23K

Claim:
1. A solid-fuel burner comprising: a fuel nozzle that opens into an opening portion of a furnace wall, the fuel nozzle comprising: a cylindrical fuel carrier piping, through which a mixed fluid of a solid fuel and a carrier gas for the solid fuel is configured to flow, is connected to the solid-fuel passage of the fuel nozzle; at least one combustion gas nozzle is provided on an outer peripheral wall side of the fuel nozzle; and a wind box, in which a combustion gas for the solid fuel is configured to flow, is provided on the outer peripheral wall side of the fuel nozzle and is in fluid communication with the at least one combustion gas nozzle, wherein the fuel nozzle has a cross-sectional shape orthogonal to a nozzle center axis of an outer peripheral wall of the fuel nozzle, the cross-sectional shape of the fuel nozzle is flattened at an opening of the fuel nozzle proximate to the opening portion in the furnace wall, the cross-sectional shape of the fuel nozzle is circular up to the constricting portion of the venturi, a degree of flatness of the cross-section shape of the fuel nozzle and a width of the fuel nozzle in a horizontal direction gradually increases from the constricting portion of the venturi to the opening of the fuel nozzle and reach a maximum degree of flatness and a maximum width in the horizontal direction at the opening of the fuel nozzle, and the upper wall and the lower wall of the fuel nozzle are spaced from each other by a constant predetermined distance from the outlet of the constricting portion of the venturi to the opening portion of the furnace wall.