The invention discloses a high-wind-temperature
rotational flow injection disturbance melting reduction and prereduction combination device and a method, which belong to the technical field of melting reduction. The device comprises a
raw material system, a furnace top material charging and distributing
system, a melting reduction furnace, a furnace top high-temperature gas
system, a prereduction furnace, a semicoke gas recycling system, a
coal dust preparing and spraying system, a molten iron desulfurizing agent preparing and jetting device, an
oxygen and
nitrogen supplying system, a residual iron treating system, a high-wind-temperature
hot blast furnace, a melting reduction furnace blower, a furnace top gas dedusting and recycling system and a gas
cogeneration device. The method comprises the following steps of: introducing high-temperature gas which is generated in a high-wind-temperature
rotational flow injection disturbance melting reduction furnace into the prereduction furnace; directly reducing an iron-containing
raw material in a
solid phase state into a prereduction furnace material with a certain metallization rate; cooling, and then adding the cooled material and semicoke which serve as the furnace material and a fuel respectively into the melting reduction furnace; and finally producing molten iron by reduction. The device and the method have the advantages of high production efficiency and low
energy consumption, are easy to operate and make industrialization easily realized.