ONCE-THROUGH PULVERIZED-FUEL BURNER Russian patent published in 1995 - IPC

FIELD: furnaces. SUBSTANCE: once-through pulverized-fuel burner has four similar nozzles for feeding air-coal mixture equally spaced from vertical and horizontal center lines of burner, and also adjacent nozzles for feeding secondary air and recirculation gases. Air-fuel mixture feeding nozzles are mounted in horizontal and vertical planes at clear distance of 0.8-1.0 of height and which of air-fuel mixture nozzle, respectively; secondary-air nozzles are mounted in center coaxially in respect to each air-fuel mixture nozzle at 0.8 to 1.4 of air-fuel mixture nozzle width from exit edge of burner; central secondary-air nozzle whose area makes up 36-54 of entire area of secondary-air feeding nozzles and recirculation-gas feeding nozzles abutting central nozzle on both sides are placed in same plane as burner exit edge in center of intersection of burner center lines. EFFECT: improved fuel combustion and burn-up, reduced content of toxic nitrogen oxides emitted during fuel combustion. 3 dwg