Title:
LOW CARBON BLAST FURNACE IRONMAKING METHOD
Document Type and Number:
WIPO Patent Application WO/2023/029816
Kind Code:
A1
Abstract:
The present invention provides a low carbon blast furnace ironmaking method, comprising: injecting heated and pressurized back-injection gas into a blast furnace, injecting pure oxygen into the blast furnace or injecting oxygen-enriched hot air into the blast furnace, spraying pulverized coal into the blast furnace, and alternately loading iron ore, coke and other furnace charges into the blast furnace; after the gas blown into the blast furnace undergoes a chemical reaction with the furnace charges and the like, forming a furnace top gas; after the furnace top gas undergoes a series of treatment processes, pressurizing and heating the furnace top gas and then injecting into the blast furnace as back-injection gas, and sending the remaining furnace top gas to a gas pipe network. According to the present invention, the oxygen-enriched smelting and furnace top gas circulation processes are adopted, the utilization rate of carbon in a blast furnace is greatly improved, the concentration of reducing gas in bosh gas is increased, the direct reduction degree in a blast furnace hearth is reduced, the fuel consumption is saved, the blast furnace fuel ratio is reduced, the blast furnace ironmaking efficiency is improved, and the emission of CO2 in the blast furnace ironmaking process is reduced.
Inventors:
ZOU ZHONGPING (CN)
XIAO XUEWEN (CN)
WANG GANG (CN)
LI MUMING (CN)
ZHAO YUNJIAN (CN)
XU CAN (CN)
ZHENG JUN (CN)
NIU QUN (CN)
ZHAI XIAOBO (CN)
WU KAIJI (CN)
QUAN KUI (CN)
XU JUN (CN)
XIAO XUEWEN (CN)
WANG GANG (CN)
LI MUMING (CN)
ZHAO YUNJIAN (CN)
XU CAN (CN)
ZHENG JUN (CN)
NIU QUN (CN)
ZHAI XIAOBO (CN)
WU KAIJI (CN)
QUAN KUI (CN)
XU JUN (CN)
Application Number:
PCT/CN2022/107904
Publication Date:
March 09, 2023
Filing Date:
July 26, 2022
Export Citation:
Assignee:
CISDI ENG CO LTD (CN)
CISDI RES & DEVELOPMENT CO LTD (CN)
CISDI RES & DEVELOPMENT CO LTD (CN)
International Classes:
C21B5/00; C21B5/06
Foreign References:
| CN215856190U | 2022-02-18 | |||
| CN113718074A | 2021-11-30 | |||
| CN101555532A | 2009-10-14 | |||
| CN1916187A | 2007-02-21 | |||
| JPH06330113A | 1994-11-29 | |||
| CN101503745A | 2009-08-12 | |||
| CN102220443A | 2011-10-19 | |||
| CN107151718A | 2017-09-12 |
Attorney, Agent or Firm:
TIDYTEND INTELLECTUAL PROPERTY LAW FIRM (CN)
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