Method and corresponding apparatus for producing iron from direct reduction of iron ore
AssigneesDanieli & C. Officine Meccaniche SpA, Hyl Technologies, S.A. De C.V.
InventorsBarbara Franco, Paolo Roman Di Catterina, Jorge Eugenio Martinez Miramontes
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Abstract
A method for producing direct reduced iron is provided. The method includes circulating a first stream of spent reducing gas exiting a reactor in a reducing gas circuit through at least one carbon dioxide removal unit and a reducing gas heater and the reactor. The method also includes mixing the first stream with reducing gas containing heavier hydrocarbons than methane.
Claims12
A method for producing DRI in a direct reduction process using a reducing gas selected from a natural gas having more than 4% by volume of total hydrocarbons heavier than methane, coke oven gas (COG) having complex carbon compounds (BTX), or other synthetic gases coming from any source with a content of CH4 and heavy hydrocarbons, wherein said method comprises circulating a first stream (F1) of reducing gas exiting a reduction reactor (10) in a reducing gas circuit (20) through at least one carbon dioxide removal unit (38), a reducing gas heater (42) and said reduction reactor (10);
- and feeding, into said reducing gas circuit (20), between said reducing gas heater (42) and said reduction reactor (10), a stream (F2) of fresh reducing gas, feeding at least one further stream (F3, F4) of fresh reducing gas into said reducing gas circuit (20) wherein a flow rate of said stream (F2) of fresh reducing gas is more than 20% by volume of a sum of the flow rate of said stream (F2) plus a flow rate of said at least one further stream (F3, F4) of fresh reducing gas,
- wherein said method does not comprise any step of removal of hydrocarbons heavier than methane from the fresh reducing gas streams (F3, F4) fed into the reducing gas circuit (20).
Dependencies are inferred from the claim text.