Pulverized coal burner

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,
• said impinged diffuser further having a parallel portion, being parallel to the central axis of said fuel nozzle and provided on the central axis of said fuel nozzle so as to extend from said expanding portion, and a narrowing portion narrowing from an upstream side to a downstream side, said narrowing portion being provided on the central axis of said fuel nozzle so as to extend from said parallel portion, and
• a 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.