Combustibility of biochar injected into the raceway of a blast furnace
Combustibility of biochar injected into the raceway of a blast furnace
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DOI：
10.1016/j.fuproc.2013.01.012
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发表时间：
2014
影响因子：
7.5
通讯作者：
A. Wijayanta;S. Alam;K. Nakaso;J. Fukai;K. Kunitomo;M. Shimizu
中科院分区：
文献类型：
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作者：
A. Wijayanta;S. Alam;K. Nakaso;J. Fukai;K. Kunitomo;M. Shimizu
对太黑窑煤和橡木焦在炼铁高炉风口和滚道内的可燃性进行了模拟。研究了喷射速率、o2浓度和颗粒直径对燃烧性能的影响。数值结果表明，当o2浓度从23%增加到27wt .%时，两种固体燃料的可燃性均有所提高。但在高喷油速率下，由于挥发物含量低于太黑窑煤，这种效果不足以提高焦炭的可燃性。温度场和反应场对燃烧热和挥发分都很敏感。为了获得与参考煤相同的可燃性，需要更长的滚道或更小的颗粒尺寸。如果使用粒径为70 μm的太黑窑煤，在高喷注速率为200 [（kg固体燃料）/（1000 nm3原料气）]、含氧量为27 wt.%的热风条件下，要求焦炭粒径为60 μm才能获得相同的可燃性。这些预测揭示了在高炉炼铁中使用生物炭粉喷射代替传统煤粉喷射的潜力。
The combustibility of Taiheiyo coal and oak char in the tuyere and raceway of an ironmaking blast furnace was simulated. The effects of injection rate, O2concentration and particle diameter on combustibility were studied. Numerical results showed that increasing the O2concentration from 23 to 27 wt.% resulted in higher combustibility of both solid fuels. However, this effect was insufficient to increase the combustibility of oak char at high injection rates because its volatile content was lower than that of Taiheiyo coal. Temperature and reaction fields were sensitive to both combustion heat and volatile content. A longer raceway or smaller particle size was required to obtain the same combustibility of biochar as of the reference coal. If Taiheiyo coal with a particle diameter of 70 μm was used at a high injection rate of 200 [(kg solid fuel)/(1000 Nm3feed gas)] with hot blasts containing 27 wt.% O2, the particle diameter of oak char was required to be 60 μm to obtain the same combustibility. These predictions reveal the potential of pulverized biochar injection instead of conventional pulverized coal injection in blast furnace ironmaking.