US 12,084,731 B2
Device for manufacturing molten iron
Chang Kuk Ko, Pohang-si (KR); and Myoung Kyun Shin, Pohang-si (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Appl. No. 17/294,197
Filed by POSCO, Pohang-si (KR)
PCT Filed Nov. 1, 2019, PCT No. PCT/KR2019/014703
§ 371(c)(1), (2) Date May 14, 2021,
PCT Pub. No. WO2020/105901, PCT Pub. Date May 28, 2020.
Claims priority of application No. 10-2018-0145287 (KR), filed on Nov. 22, 2018.
Prior Publication US 2022/0002826 A1, Jan. 6, 2022
Int. Cl. C21B 13/14 (2006.01); B01D 47/00 (2006.01); B01D 53/18 (2006.01); C21B 13/00 (2006.01); F27B 15/02 (2006.01)
CPC C21B 13/146 (2013.01) [B01D 47/00 (2013.01); B01D 53/18 (2013.01); C21B 13/0033 (2013.01); C21B 13/0073 (2013.01); C21B 13/14 (2013.01); F27B 15/02 (2013.01); C21B 2100/44 (2017.05); C21B 2100/66 (2017.05); C21B 2300/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A device for manufacturing a molten iron comprising:
a multi-stage fluidized reduction furnace for reducing a powdered iron ore including hematite and limonite;
a melting gas furnace connected to the fluidized reduction furnace through an ore conduit and a gas conduit;
a fluidized bed oxidation furnace for oxidizing magnetite to be converted into hematite through steam provided from the fluidized reduction furnace;
a hydrogen processing unit for processing hydrogen generated by the oxidation reaction of magnetite in the fluidized bed oxidation furnace;
a heat recovery device for recovering heat of the reduced gas discharged from the fluidized reduction furnace and generating steam;
a steam supply line connecting the fluidized bed oxidation furnace and the heat recovery device and supplying the steam generated in the heat recovery device to the fluidized bed oxidation furnace; and
a hydrogen rich gas exhaust line for discharging a hydrogen rich gas generated from the fluidized bed oxidation furnace,
wherein the hydrogen processing unit includes:
a scrubber that is connected to the hydrogen rich gas exhaust line and removes steam and magnetite dust included in the hydrogen rich gas,
a compressor connected to the scrubber and boosting the hydrogen rich gas discharged from the scrubber, and
a first gas circulation line that connects the compressor and the melting gas furnace and supplies the hydrogen rich gas to the melting gas furnace.