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AssigneeHyl Technologies, S.A. De C.V.
InventorsEugenio Zendejas-Martinez, Pablo-Enrique Duarte-Escareno
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A process for reducing iron ore particles in a moving bed reduction reactor comprising an upper reduction zone and a lower discharge zone, wherein the coke oven gas, preferably forming all the make-up for the reducing gas circulating through and reacting in said reduction zone, is first fed to said discharge (cooling) zone and thereafter said coke oven gas, conditioned by the DRI in the lower zone, is withdrawn from the reactor and fed preferably into the recycled reducing gas for injection into the reduction zone of the reactor. Heavy hydrocarbons and other components of coke oven gas which may otherwise cause fouling, corrosion, or deposits in the direct reduction plant are removed from coke oven gas by catalytic and/or adsorptive action of the DRI present in said lower zone, before being externally transferred to the reduction zone of the reduction reactor.
A method for producing direct reduced iron (DRI) through the reduction of iron-oxides-containing particles to metallic iron-containing particles (DRI) in a reduction reactor, comprising a reduction zone and a lower discharge zone, by contacting said iron-oxides-containing particles with a high temperature reducing gas stream, comprising hydrogen and carbon monoxide in said reduction zone, and wherein the reduced particles (DRI) flow from said reduction zone down through said lower discharge zone;
(canceled)
A method according to claim 15, wherein the water content of the combined gases is increased to a level between about 5% and about 10% by volume prior to heating.
A method according to claim 9, wherein said gas withdrawn from said reactor out of said lower zone is cooled and cleaned, said first portion thereof is thereafter transferred externally, to said reducing gas effluent, and a second portion thereof, also cooled and cleaned, is recirculated back into the lower zone for cooling the DRI therein.
(canceled)
A method according to claim 11, wherein the flow rate of said methane-containing process gas is greater than the flow rate of said transferred portion of said withdrawn gas by between about 100 normal cubic meters and about 200 normal cubic meters per metric ton of DRI produced in said reduction reactor.
Dependencies are inferred from the claim text.