PULVERIZED COAL-FIRED BOILER Russian patent published in 2017 - IPC F23C1/00 F23C3/00 F23C5/08 

FIELD: power industry.

SUBSTANCE: pulverized coal-fired boiler comprises a vertical water-cooled furnace of rectangular cross-section and mounted in its upper part tangentially directed burners and air nozzles, a lower gas end, a lower horizontal gas flue with a platen superheater, dry-bottom hoppers in the bottom part of the furnace, vertical uptaking and downtaking gas flues with superheater banks of sharp and secondary steam, a water economizer and an air heater and is provided with additional vertical uptaking and downtaking gas flues connected to the boiler furnace via additional bottom horizontal gas flue with a platen superheater, the furnace is provided with single-row burners, as well as with upstream nozzles of secondary air and downstream nozzles of tertiary air, which are mounted scatteredlyacross the width of furnace big walls acctoding to the counter-displacedscheme, the gas ends and bottom horizontal gas flues with platen superheaters are located opposite each other, aerodynamic noses of furnace small walls are located above the gas ends, dry-bottom hoppers with four sloping surfaces are located in the furnace bottom part, wherein in the bottom horizontal and uptaking vertical gas flues platens and banks of the sharp stream are mounted on the one side, while platens and banks of the secondary stream are mounted on the opposide side.

EFFECT: elimination of increased platen superheater slagging and reduction of nitrogen oxide content at the furnace peripheral areas.

1 dwg