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Comparison of semi-coke with traditional pulverized coal injection and iron ore sintering fuels based on chemical structure and combustion behavior

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Abstract

Substantial semi-coke has been produced through the industrialized low-temperature pyrolysis process, which has great potential as an alternative fuel for pulverized coal injection (PCI) and iron ore sintering. X-ray diffraction, Raman spectroscope, and thermal analysis were used to compare the carbon chemical structure and combustion reactivity of semi-coke, pulverized coal, and coke breeze. The results show that the average volatile matter content in 46 types of semi-cokes is 8.94 wt.%. The fluctuation range of the characteristic parameters of the semi-coke chemical structure is d002 = (0.352–0.379) nm and AD1/AG = (2.51–7.92), while the fluctuation range of the characteristic parameters of pulverized coal is d002 = (0.348–0.373) nm and AD1/AG = (1.71–9.03) (where d002 means the interlayer spacing between the aromatic planes, and AD1/AG is an index that characterizes the degree of disorder of the char structure through the area ratio of the defect peak band D1 to the perfect graphite peak band G); the overlap between these ranges is relatively high. Contrarily, the fluctuation range of the characteristic parameters of coke breeze is d002 = (0.343–0.350) nm and AD1/AG = (0.75–2.51), which is markedly different from that of semi-coke. Semi-coke combustion reactivity is close to that of pulverized coal, but considerably better than that of coke breeze. In terms of chemical structure and combustion reactivity, semi-coke can be used as an alternative fuel for PCI; however, when used for sintering alternative fuel, matching of the heat supply and demand in the later sintering stage must be scrupulously analyzed.

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Acknowledgements

The authors thank the National Natural Science Foundation of China (Nos. 51374166 and 51704224) for funding this research.

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Authors and Affiliations

  1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710311, Shaanxi, China

    Jiang-yong He, Chong Zou, Jun-xue Zhao, Jia-le Xi & Cheng Ma

  2. Technical Center of Shandong Iron and Steel Co., Ltd. (Laiwu Branch), Jinan, 271104, Shandong, China

    Dong Liang

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  1. Jiang-yong He
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  2. Chong Zou
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Correspondence to Chong Zou.

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He, Jy., Zou, C., Zhao, Jx. et al. Comparison of semi-coke with traditional pulverized coal injection and iron ore sintering fuels based on chemical structure and combustion behavior. J. Iron Steel Res. Int. 29, 725–740 (2022). https://doi.org/10.1007/s42243-021-00726-8

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  • DOI: https://doi.org/10.1007/s42243-021-00726-8

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