Abstract: Method for producing direct reduced metal material, comprising the steps: a) charging metal material (142) to be reduced into a furnace space (120); b) providing heat and a reducing gas into the furnace space (120), so that heated reducing gas heats the charged metal material (142) to a temperature high enough so that metal oxides present in the charged metal material (142) are reduced, in turn causing water vapour to be formed; and c) condensing and collecting the water vapour formed in step c in a condenser (280); The method is characterised in that, in step a), the metal material (142) is charged onto a gas-permeable floor (151), in that the reducing gas is circulated in a closed loop upwards through said floor (151), through the charged metal material (142), and further via said condenser (280) and a gas forced circulation device (250), and in that the method further comprises the step d) supplying additional reducing gas to achieve and/or maintain a predetermined pressure in said furnace space (120).

Abstract: A method for producing direct reduced metal material includes charging metal material to be reduced into a furnace space; evacuating an existing atmosphere from the furnace space so as to achieve an underpressure inside the furnace space; providing, in a main heating step, heat and hydrogen gas to the furnace space, so that heated hydrogen gas heats the charged metal material to a temperature high enough so that metal oxides present in the metal material are reduced, in turn causing water vapor to be formed; and condensing and collecting the water vapor in a condenser below the charged metal material. The providing of heat and hydrogen gas, and the condensing and collecting, are performed at least until a hydrogen atmosphere overpressure has been reached inside the furnace space, and so that no hydrogen gas is evacuated from the furnace space until the overpressure has been reached.

Abstract: Method and system for producing direct reduced metal material, comprising the steps: a) charging metal material to be reduced into a furnace space (120); b) evacuating an existing atmosphere from the furnace space to achieve a gas pressure of less than 1 bar therein, c) providing heat and hydrogen gas into the furnace space, so that heated hydrogen gas heats the charged metal material to a temperature high enough so that metal oxides present in the metal material are reduced, in turn causing water vapour to be formed, which hydrogen gas provision is performed so that a pressure of more than 1 bar builds up inside the furnace space; and d) before evacuating the built up overpressure, condensing and collecting the water vapour formed in step c in a condenser (160) below the charged metal material.

Abstract: A method for producing direct reduced metal material includes charging metal material into a first furnace space of a first furnace; evacuating an atmosphere from the first furnace space to achieve an underpressure inside the first furnace space; providing heat and first hydrogen gas without recirculation to the first furnace space, so that heated first hydrogen gas heats the charged metal material so that metal oxides present in the metal material are reduced, causing water vapor to be formed; and condensing and collecting the water vapor in a condenser. A subsequently performed charged material cooling step is carried out in which thermal energy from the charged material is absorbed by the first hydrogen gas, and in which thermal energy, by heat exchange, is transferred from the first hydrogen gas to second hydrogen gas to be used in a second furnace for producing direct reduced metal material.

Abstract: A method for producing direct reduced metal material includes charging metal material to be reduced into a furnace space; evacuating an existing atmosphere from the furnace space so as to achieve an underpressure inside the furnace space; providing, in a main heating step, heat and hydrogen gas to the furnace space, so that heated hydrogen gas heats the charged metal material to a temperature high enough so that metal oxides present in the metal material are reduced, in turn causing water vapor to be formed; condensing and collecting the water vapor in a condenser below the charged metal material. The hydrogen gas is provided without recirculation of the hydrogen gas. The also includes a subsequently performed step of removing the reduced metal material from the furnace space, and storing and/or transporting the reduced metal material under an inert atmosphere.