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Influence of particle size on combustion behavior of bamboo char used for blast furnace injection

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Abstract

The combustion behavior of bamboo char and its relationship with particle sizes were evaluated using thermo-gravimetric analysis. The results showed that the combustion properties of bamboo char were much better than those of the anthracite used as a coal injected for blast furnace ironmaking due to its porous structure, disordered microcrystalline and higher catalytic index of ash minerals. When the particle size increased from − 0.074 to 0.500–1.000 mm, the ignition temperature and burnout temperature of bamboo char increased, while the combustible index and comprehensive combustion characteristic index decreased slightly. The apparent activation energies of non-isothermal combustion of bamboo char and anthracite were calculated based on the distributed activation energy model. The results showed that the average activation energy was 162.86 kJ/mol for − 0.074 mm anthracite, while it ranged from 71.01 to 89.44 kJ/mol for bamboo chars of different sizes. It revealed that the combustion reactivity of bamboo char in the largest size (0.500–1.000 mm) was much better than that of − 0.074 mm anthracite; thus, the size of biomass char could be enlarged to the maximum size specified by the injection application of blast furnace.

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Acknowledgements

The authors acknowledge the financial support from the China Postdoctoral Science Foundation (2016M602378) and National Natural Science Foundation of China (Nos. 51704216 and U1760101).

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Author notes

  1. Run-sheng Xu and Wei Wang have contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Run-sheng Xu, Wei Wang & Bo-wen Dai

  2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Run-sheng Xu, Wei Wang & Bo-wen Dai

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  1. Run-sheng Xu
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  2. Wei Wang
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Correspondence to Run-sheng Xu.

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Xu, Rs., Wang, W. & Dai, Bw. Influence of particle size on combustion behavior of bamboo char used for blast furnace injection. J. Iron Steel Res. Int. 25, 1213–1222 (2018). https://doi.org/10.1007/s42243-018-0186-0

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  • DOI: https://doi.org/10.1007/s42243-018-0186-0

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