The blowing-in method comprises the following steps: filling furnace charge after the furnace is dried, blowing and heating
nitrogen at a
tuyere for preheating, then feeding hot
coal gas and
oxygen at the
tuyere, controlling the theoretical
combustion temperature at 2350-2400 DEG C, and tapping when the theoretical iron amount in a
hearth reaches 60% of the normal safe iron capacity; then, the in-furnace load is gradually increased, the in-furnace reduction gas amount and
oxygen amount are increased, normal tapping and in-furnace load adjustment are organized, and the theoretical
combustion temperature in the stage is 2400-2500 DEG C; according to the invention, heated
nitrogen is used for purging materials, quickly and effectively
drying and increasing the temperature of the materials, a
blast furnace gas
system is inerted, heated reducing gas and high-temperature and high-reducibility gas are injected into a
tuyere, enter the furnace, immediately undergo a reduction reaction with upper furnace charge, and are combusted with injected
oxygen to release a large amount of heat, so that the temperature of a
hearth can be quickly increased; blow-in time is shortened, and raw fuel consumption is effectively reduced.