FURNACE Russian patent published in 1999 - IPC

FIELD: thermal engineering and other industries. SUBSTANCE: furnace has vertical combustion chamber, hot- air duct connected through burners to combustion chamber, and nozzles arranged along one or two slopes of combustion chamber hopper and connected through undergrate-blast pipeline to pipelines carrying hot air, pulverized-coal system drying agent, boiler exit gases; ratio of distance between lower- row burners and undergrate-blast nozzles Δh_b-n to furnace height h_f is = 0.1-0.5. EFFECT: improved efficiency of secondary combustion which raises economic efficiency of combustion chamber. 2 cl, 1 dwg