FIELD: air heaters.
SUBSTANCE: group of inventions relates to a method for supplying air to a blast furnace using the heat of cold air from an axial blower of a blast furnace and a system of air heaters for heating the blast furnace blast. According to the method, when two or more air heaters are configured and alternately supply air to the blast furnace, a heat exchange device is installed and the temperature of the air at the inlet of the air heater that is in the blowing mode is lowered to extend the heating time of the air heater that is in the heating mode. The system of air heaters for heating the blast furnace blast contains an air heater and axial blowers connected by a hot air pipeline, while a heat exchange device is installed on the hot air pipeline, which ensures a decrease in air temperature at the air heater inlet.
EFFECT: use of heat of cold air of axial blower, extension of heating time of the air heater, which is in the heating mode, and increase in air temperature at the outlet of the air heater, which allows to reduce coke consumption and increase the output of iron and steel.
9 cl, 4 dwg
