Method for producing direct reduction iron by sectional oxygen supply shaft furnace

The invention provides a method for producing direct reduction iron through a sectional type oxygen supply shaft furnace. A sectional type oxygen supply shaft furnace system comprises a shaft furnace body, a dust removal device, a heat recovery device, a dehydration device, a pressurization device, a CO2 removal device and a reducing gas heating device. According to the method for reducing iron, excessive chemical energy is converted into physical energy, the limitation that a traditional shaft furnace process only depends on coal gas physical heat is broken through, the coal gas demand limited by heat balance is reduced, the temperature in the furnace is increased, the dynamic condition of iron ore reduction reaction is improved, and the reduction speed is increased; the problem that physical energy and chemical energy in the shaft furnace reactor are not matched is essentially solved, chemical energy of reducing gas in the furnace is fully utilized, the reduction potential of furnace top gas is greatly redu