SYSTEM AND METHOD OF REDUCING IRON OXIDE TO METALLIC IRON USING COKE OVEN GAS AND OXYGEN STEELMAKING FURNACE GAS Russian patent published in 2015 - IPC C21B13/02 F27B19/04 

FIELD: chemistry.

SUBSTANCE: system comprises a direct reduction shaft furnace in which iron oxide is reduced to metallic iron using a stream of reducing gas and an off gas is provided, a coke oven gas (COG) source for feeding COG into the stream of reducing gas containing at least a portion of off gas, which is used in said direct reduction shaft furnace, and a pipe for transferring a portion of the COG from the COG source into a transition zone of the direct reduction shaft furnace. During feeding the COG has temperature of about 1200°C or higher. The COG has CH₄ content of about 2% to about 13%. The COG is preferably reformed COG. Optionally, the COG is fresh hot COG. The COG source includes a partial oxidation system. Optionally, the COG source includes a hot oxygen burner.

EFFECT: invention minimises the amount of DRI, HDRI or HBI, which can be obtained from the used amount of COG or BOFG, excluding an external catalytic reforming furnace, restricting accumulation of N₂ to an acceptable level.

23 cl, 3 dwg, 1 tbl