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公开(公告)号：EP2798293B1
公开(公告)日：2019-06-12
申请号：EP12852464.2
申请日：2012-12-27
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公开(公告)号：EP2798293A2
公开(公告)日：2014-11-05
申请号：EP12852464.2
申请日：2012-12-27
IPC分类号： F27B1/10 , C21B5/00 , C21B5/06 , F27B1/18 , F27B1/24 , F27D17/00 , C10K1/00 , C10K1/02 , C10K3/04
CPC分类号： C21B5/06 , B01D2257/504 , B01D2258/025 , C10K1/005 , C10K1/02 , C10K1/04 , C10K3/04 , C21B5/00 , C21B7/002 , C21B7/16 , C21B7/22 , C21B2100/02 , C21B2100/04 , C21B2100/24 , C21B2100/282 , C21B2300/02 , F27B1/10 , F27B1/18 , F27B1/24 , F27D17/001 , F27D17/008 , Y02P10/122 , Y02P10/126 , Y02P10/128 , Y02P10/216 , Y02P10/283
摘要： A blast furnace where coke is combusted with oxygen, instead of air, and where a top gas comprising CO, CO2, H2, and without excess nitrogen is withdrawn from the upper part of the blast furnace, cleaned of dust, the H2/CO volume ratio adjusted to between 1.5 to 4.0 in a water shift reactor, water and CO2 are removed (increasing its reduction potential), heated to a temperature above 850° C. and fed back to the blast furnace above where iron starts melting (thereby increasing the amount of metallic iron reaching the dead-man zone and decreasing the amount of coke used for reduction). Also carbon deposit problems caused by heating the CO-containing recycled gas are minimized by on-line cleaning of the heater tubes with steam without significantly affecting the reduction potential of the recycled reducing gas.
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