公开(公告)号：US20230002841A1

公开(公告)日：2023-01-05

申请号：US17642890

申请日：2020-09-22

申请人： GREENIRON H2 AB

发明人： Hans E. H. MURRAY

IPC分类号： C21B13/12 ,  C23C8/22 ,  C21B13/00

摘要： 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. The invention is characterised in that it further comprises the step e) before evacuating the build up overpressure, providing a carbon-containing gas to the furnace space, so that the heated and reduced metal material is carburized by said carbon-containing gas.

公开(公告)号：US20240150859A1

公开(公告)日：2024-05-09

申请号：US18281615

申请日：2022-03-04

申请人： GREENIRON H2 AB

发明人： Hans MURRAY

IPC分类号： C21B13/00

CPC分类号： C21B13/0073 ,  C21B13/004 ,  C21B2100/64 ,  C21B2100/66

摘要： Method for producing direct reduced metal material (106) in a continuous process, wherein hydrogen gas and inert gas is circulated in respective closed-loop first and second gas circuits via different respective gas connection stations (130,140120-122,150-151), comprising for individual mobile furnaces (101): a) charging metal material (106) into the furnace; b) moving and connecting the furnace to an inert gas connection station; c) providing heated inert gas to the furnace; d) disconnecting the furnace; e) moving and connecting the furnace to a hydrogen gas connection station; f) providing heated hydrogen gas to the furnace; g) disconnecting the furnace; h) moving and connecting the furnace to an inert gas connection station; i) providing cooled inert gas to the furnace; j) disconnecting the furnace; and k) discharging the metal material. The invention also relates to a system.

公开(公告)号：US20230235418A1

公开(公告)日：2023-07-27

申请号：US18011820

申请日：2021-06-24

申请人： GREENIRON H2 AB

发明人： Hans E.H. MURRAY

IPC分类号： C21B13/00

CPC分类号： C21B13/0033 ,  C21B13/004 ,  C21B2300/02 ,  C21B2100/66 ,  C21B2100/64 ,  C23C8/22

摘要： 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). The invention also relates to a system.

公开(公告)号：US20220119914A1

公开(公告)日：2022-04-21

申请号：US17599501

申请日：2020-03-31

申请人： GREENIRON H2 AB

发明人： Hans MURRAY

IPC分类号： C22B5/12 ,  C21B13/00

摘要： Method 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 (120) so as to achieve an underpressure inside the furnace space (120); c) providing, in a main heating step, heat and hydrogen gas to the furnace space (120), 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; and d) condensing and collecting the water vapour formed in step c in a condenser (160) below the charged metal material, characterised in that steps c and d are performed at least until a hydrogen atmosphere overpressure has been reached inside the furnace space (120), and in that no hydrogen gas is evacuated from the furnace space (120) until said overpressure has been reached. The invention also relates to a system.

公开(公告)号：US20220010405A1

公开(公告)日：2022-01-13

申请号：US17599506

申请日：2020-03-31

申请人： GREENIRON H2 AB

发明人： Hans MURRAY

IPC分类号： C22B5/12

摘要： Method 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 (120) so as to achieve an underpressure inside the furnace space (120); c) providing, in a main heating step, heat and hydrogen gas to the furnace space (120), 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; and d) condensing and collecting the water vapour formed in step c in a condenser (160) below the charged metal material; The invention is characterised in that said hydrogen gas in step c is provided without recirculation of the hydrogen gas, and in that the method further comprises the subse 15 quently performed step of removing the reduced metal material from the furnace space (120), and storing and/or transporting the reduced metal material under an inert atmosphere.

公开(公告)号：US12104222B2

公开(公告)日：2024-10-01

申请号：US17599506

申请日：2020-03-31

申请人： GREENIRON H2 AB

发明人： Hans Murray

IPC分类号： C22B5/12 ,  C21B13/00 ,  C21B13/12

CPC分类号： C22B5/12 ,  C21B13/004 ,  C21B13/0073 ,  C21B13/12

摘要： 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.

公开(公告)号：US20220064744A1

公开(公告)日：2022-03-03

申请号：US17599504

申请日：2020-03-31

申请人： GREENIRON H2 AB

发明人： Hans MURRAY

IPC分类号： C21B13/12

摘要： Method for producing direct reduced metal material, comprising the steps: a) charging metal material to be reduced into a first furnace space (120) of a first furnace (220); b) evacuating an existing atmosphere from the first furnace space (120) so as to achieve an underpressure; c) providing, in a main heating step, heat and first hydrogen gas to the first furnace space (120), so that metal oxides present in the metal material are reduced, in turn causing water vapour to be formed; and d) condensing and collecting the water vapour formed in step c in a condenser (160) below the charged metal material. The first hydrogen gas in step c is provided without recirculation of the first hydrogen gas, the method further comprises a subsequently performed charged material cooling step, in which thermal energy from the charged material is absorbed by said first hydrogen gas, and in which thermal energy, by heat exchange, is transferred from said first hydrogen gas to second hydrogen gas to be used in a second furnace (210) for producing direct reduced metal material. The invention also relates to a system.