AIR HEATER Russian patent published in 2002 - IPC

FIELD: metallurgy, particularly, high-temperature heating of blast-furnace blast. SUBSTANCE: air heater has nozzle, under-nozzle space, air header, central combustion chamber connected with burner nozzle in zone of under-nozzle space. Combustion chamber in zone of under-nozzle space is expanded. Made over perimeter of nozzle lower part are holes communicating the nozzle with air header located inside expanded part of combustion chamber. EFFECT: higher operating reliability and economic efficiency. 2 cl, 2 dwg