Patent ID: 7665408

Claim:
A solid fuel burner comprising: a fuel nozzle for ejecting a mixed fluid of a solid fuel and a transporting gas having an oxygen concentration lower than an oxygen concentration of air; an outside air nozzle for ejecting air from an outside of said fuel nozzle; portions contracting and expanding a flow passage inside said fuel nozzle; and an additional air nozzle for ejecting air and a separator dividing a flow passage inside said fuel nozzle, each provided inside said fuel nozzle, an outlet of said additional air nozzle being placed at a position that the outlet overlaps said separator which is positioned to block air ejected from said additional air nozzle when viewed in a direction perpendicular to the fuel jet direction at the separator, and said fuel nozzle having a constant area from a downstream end of said separator to the outlet of said fuel nozzle, wherein an obstacle for obstructing a flow of solid fuel and transporting air ejected from said fuel nozzle and a flow of air ejected from said outside air nozzle is provided at a downstream end of a separation wall separating said fuel nozzle and said outside air nozzle.