초록 ▼

A pulverized coal burner includes a venturi for contracting a flow of a mixture of pulverized coal and primary air toward a central axis of a fuel nozzle 2. A spindle having a cone is provided coaxially with the central axis and gradually expands from an upstream side to a downstream side to cause t

A pulverized coal burner includes a venturi for contracting a flow of a mixture of pulverized coal and primary air toward a central axis of a fuel nozzle 2. A spindle having a cone is provided coaxially with the central axis and gradually expands from an upstream side to a downstream side to cause the mixture to impinge thereon and diffuse. A column extends from the cone and is parallel to the central axis of the fuel nozzle, and a cone extends from the column and gradually narrows from an upstream side to a downstream side. A flow path divider, having a cone gradually narrowing coaxially with the central axis on the downstream side of the spindle, and a cylinder extending from the cone and being coaxial and parallel with the central axis of the fuel nozzle 2, coaxially divides the flow path.

대표청구항 ▼

[ What is claimed is:] [1.] A pulverized coal burner having a fuel nozzle for feeding a mixture of pulverized coal and air and an air nozzle for supplying combustion air in a state of swirling flow, said air nozzle being arranged outside said fuel nozzle to be coaxial with said fuel nozzle, wherein

[ What is claimed is:] [1.] A pulverized coal burner having a fuel nozzle for feeding a mixture of pulverized coal and air and an air nozzle for supplying combustion air in a state of swirling flow, said air nozzle being arranged outside said fuel nozzle to be coaxial with said fuel nozzle, wherein said fuel nozzle comprises:a constricted throat for contracting a flow of said mixture toward a central axis of said fuel nozzle,an impinged diffuser provided on the central axis of said fuel nozzle on the downstream side of said constricted throat, said impinged diffuser having an expanding portion expanding gradually from an upstream side to a downstream side and causing said mixture to impinge on said expanding portion and diffuse, anda flow path divider provided coaxially with said fuel nozzle on the downstream side of said impinged diffuser for dividing a flow path for said mixture in said fuel nozzle into an inner flow path and an outer flow path, said flow path divider having a narrowing cylinder portion gradually narrowing from an upstream side to a downstream side, said narrowing cylinder portion having an upstream side end directly facing said impinged diffuser.