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Improvement in Reduction Behavior of Sintered Ores in a Blast Furnace through Injection of Reformed Coke Oven Gas
ISIJ International ( IF 1.8 ) Pub Date : 2020-10-20 , DOI: 10.2355/isijinternational.isijint-2020-063
Kenichi Higuchi 1 , Shinroku Matsuzaki 1 , Koji Saito 2 , Seiji Nomura 1
Affiliation  

As an innovative route to mitigating CO2 emissions in ironmaking, increasing the hydrogen reduction in a blast furnace is promising. One possible method is the shaft injection or blast tuyere injection of coke oven gas (COG) with its hydrogen concentration enhanced by steam-reforming methane and tar. Therefore, the reduction behavior of sintered ores in a blast furnace by injecting reformed COG was investigated using a softening-melting tester and counter-current reaction simulator (BIS). The shaft injection of reformed COG promoted the reduction and improved the permeability of the ore layer, particularly in the wall area of the blast furnace. An injection rate larger than 200 Nm3/t-HM was required for reformed COG for a limiting intermediate distribution ratio of injection gas lower than 20% in a large blast furnace. Unchanged shaft temperature and increased hydrogen reduction were observed during the shaft injection of hot reformed COG in the BIS test. The water-gas shift reaction below the temperature of the thermal reserve zone was insignificant even for the shaft injection of reformed COG. As for tuyere injection, direct reduction was decreased by increasing the injection rate of reformed COG from tuyere. The injection of COG with or without reforming from tuyere reduced the carbon consumption of the blast furnace by 10 kg/t-HM. The influence of the composition of COG on carbon consumption was insignificant. Direct observation of hydrogen reduction revealed a decrease in flooding molten slag in the upper coke layer during reduction, thus explaining the improved permeability of the ore layers.

Changes in gas composition during the shaft injection of reformed COG. (a); (H2·CO2)/(H2O·CO), (b); H2 utilization, (c); CO utilization. (Online version in color.) Fullsize Image


中文翻译:

通过注入重整焦炉煤气改善高炉中烧结矿的还原行为

作为减少炼铁过程中CO 2排放的创新途径,提高高炉中的氢气还原量是有希望的。一种可能的方法是通过蒸汽重整甲烷和焦油来提高氢气浓度的焦炉煤气(COG)的竖井注入或高炉风口注入。因此,使用软化熔融测试仪和逆流反应模拟器(BIS)研究了通过注入重整的COG在高炉中还原矿石的行为。重整COG的竖井喷射促进了还原,并提高了矿层的渗透性,特别是在高炉壁区域。注射速率大于200 Nm 3重整的COG需要/ t-HM,以使大型高炉中的注入气体的中间分布限制比例低于20%。在BIS测试中,在热重整COG的竖井注入过程中观察到竖井温度不变,氢还原增加。即使对于竖井注入重整的COG,在热储备区温度以下的水煤气变换反应也微不足道。对于风口注入,通过增加来自风口的重整COG的注入速率可以减少直接还原。不论有无重整风口,注入COG均可将高炉的碳消耗降低10 kg / t-HM。COG的组成对碳消耗的影响微不足道。

重整COG竖井注入过程中气体成分的变化。(一种); (H 2 ·CO 2)/(H 2 O·CO),(b);H 2利用率,(c);一氧化碳利用率。(彩色在线版本。)查看全图
更新日期:2020-10-28
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