公开(公告)号：US20230167517A1

公开(公告)日：2023-06-01

申请号：US17921745

申请日：2021-05-14

申请人： NIPPON STEEL CORPORATION

发明人： Takanobu INADA ,  Moritoshi MIZUTANI ,  Yutaka UJISAWA ,  Naoto YASUDA ,  Hitoshi FUNAGANE

IPC分类号： C21B13/00 ,  C21B13/02

CPC分类号： C21B13/0073 ,  C21B13/02 ,  C21B2100/40 ,  C21B2100/64

摘要： A method for producing reduced iron that produces reduced iron by reducing iron oxide charged in a shaft furnace, in which a heated gas mixture which contains a reducing gas and a nitrogen gas, the reducing gas containing 90 volume % or more of a hydrogen gas, is blown into the shaft furnace from a tuyere equipped at a lower portion of a reduction zone of the shaft furnace, at least part of the reducing gas is blown into a cooling zone of the reduced iron provided at a lower portion of the shaft furnace at normal temperature, and the reducing gas that has flowed up in the cooling zone is used for reduction of the iron oxide.

公开(公告)号：US20230167516A1

公开(公告)日：2023-06-01

申请号：US17921654

申请日：2021-05-13

申请人： NIPPON STEEL CORPORATION

发明人： Takanobu INADA ,  Moritoshi MIZUTANI ,  Yutaka UJISAWA

IPC分类号： C21B13/00 ,  C21B13/02

CPC分类号： C21B13/0073 ,  C21B13/02 ,  C21B2100/28 ,  C21B2100/40 ,  C21B2100/64

摘要： A method for producing reduced iron that produces reduced iron by reducing iron oxide charged in a shaft furnace, in which a gas mixture which contains a reducing gas and a nitrogen gas, and has a predetermined temperature, is blown into the shaft furnace. The reducing gas contains 90 volume% or more of a hydrogen gas.