Micromorphology and safety properties of meager and meager-lean coal for blast furnace injection


Four types of meager and meager-lean coal and one type of high-quality anthracite were selected based on the safety requirements for blast furnace coal injection and domestic coal quality to conduct microstructure and component analyses. The analyses of the organic and inorganic macerals and the chemical compositions of the selected coal samples indicate that the four types of meager and meager-lean coal have low volatilization, low ash content, and low sulfur content; these qualities are suitable for blast furnace injection. Grindability test was conducted on the four types of meager and meager-lean coal and the anthracite mixed coal samples. Results indicate that the mixture of meager and meager-lean coal and anthracite is beneficial to improve the grindability of pulverized coal. The explosive tests reveal that the selected coal samples are non-explosive or weakly explosive. When the proportion of meager and meager-lean coal is less than 40wt%, the mixed coal powder would not explode during the blowing process. The minimum ignition temperature test determines that the minimum ignition temperatures of the four types of meager and meager-lean coal and anthracite are 326, 313, 310, 315, and 393°C, respectively. This study provides a guiding research idea for the safety of meager and meager-lean coal used in blast furnace injection.

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  1. [1]

    A.I. Babich, H.W. Gudenau, K.T. Mavrommatis, C. Froehling, A. Formoso, A. Cores, and L. García, Choice of technological regimes of a blast furnace operation with injection of hot reducing gases, Rev. Metal., 38(2002), No. 4, p. 288.

    CAS  Article  Google Scholar 

  2. [2]

    S. Raygan, H. Abdizadeh, and A.E. Rizi, Evaluation of four coals for blast furnace pulverized coal injection, J. Iron Steel Res. Int., 17(2010), No. 3, p. 8.

    CAS  Article  Google Scholar 

  3. [3]

    M.M. Sun, J.L. Zhang, K.J. Li, K. Guo, Z.M. Wang, and C.H. Jiang, Gasification kinetics of bulk coke in the CO2/CO/H2/H2O/N2 system simulating the atmosphere in the industrial blast furnace, Int. J. Miner. Metall. Mater., 26(2019), No. 10, p. 1247.

    CAS  Article  Google Scholar 

  4. [4]

    H.B. Zhu, W.L. Zhan, Z.J. He, Y.C. Yu, Q.H. Pang, and J.H. Zhang, Pore structure evolution during coke graphitization process in a blast furnace, Int. J. Miner. Metall. Mater., 27(2020), No. 9, p. 1226.

    CAS  Article  Google Scholar 

  5. [5]

    S.F. Zhang, C.G. Bai, L.Y. Wen, G.B. Qiu, and X.W. Lü, Gas-particle flow and combustion characteristics of pulverized coal injection in blast furnace raceway, J. Iron Steel Res. Int., 17(2010), No. 10, p. 8.

    Article  Google Scholar 

  6. [6]

    T.F. Song, J.L. Zhang, G.W. Wang, H.Y. Wang, and R.S. Xu, Influencing factors of the explosion characteristics of modified coal used for blast furnace injection, Powder Technol., 353(2019), p. 171.

    CAS  Article  Google Scholar 

  7. [7]

    D. Kim, S. Shin, S. Sohn, J. Choi, and B. Ban, Waste plastics as supplemental fuel in the blast furnace process: Improving combustion efficiencies, J. Hazard. Mater., 94(2002), No. 3, p. 213.

    CAS  Article  Google Scholar 

  8. [8]

    M.S. Bi and H.Y. Wang, Experiment on methane-coal dust explosions, J. China Coal Soc., 33(2008), No. 7, p. 784.

    CAS  Google Scholar 

  9. [9]

    Q.Z. Li, K. Wang, Y.N. Zheng, M.L. Ruan, X.N. Mei, and B.Q. Lin, Experimental research of particle size and size dispersity on the explosibility characteristics of coal dust, Powder Technol., 292(2016), p. 290.

    CAS  Article  Google Scholar 

  10. [10]

    D.W. Xiang, F.M. Shen, J.L. Yang, X. Jiang, H.Y. Zheng, Q.J. Gao, and J.X. Li, Combustion characteristics of unburned pulverized coal and its reaction kinetics with CO2, Int. J. Miner. Metall. Mater., 26(2019), No. 7, p. 811.

    CAS  Article  Google Scholar 

  11. [11]

    E. Osório, M.D.L.I. Gomes, A.C.F. Vilela, W. Kalkreuth, M.A.A. de Almeida, A.G. Borrego, and D. Alvarez, Evaluation of petrology and reactivity of coal blends for use in pulverized coal injection (PCI), Int. J. Coal Geol., 68(2006), No. 1–2, p. 14.

    Article  Google Scholar 

  12. [12]

    S.W. Du, W.H. Chen, and J.A. Lucas, Pulverized coal burnout in blast furnace simulated by a drop tube furnace, Energy, 35(2010), No. 2, p. 576.

    CAS  Article  Google Scholar 

  13. [13]

    D.X. Han, China Coal Petrology, China University of Mining and Technology Press, Xuzhou, 1996, p. 55.

    Google Scholar 

  14. [14]

    J. Cheng, A.N. Zhou, and J.W. Li, Development of coal structure, Coal Convers., 24(2001), No. 4, p. 1.

    CAS  Google Scholar 

  15. [15]

    C. Wang, Y.L. Liu, L. Yu, S.B. Leng, and D.L. Wang, Discussion on the accuracy of ash content testing of automatic industrial analyzer used in power plant, Shandong Dianli Jishu, 44(2017), No. 5, p. 58.

    Google Scholar 

  16. [16]

    W.M. Fang and L.L. Pan, Development of VTI grindability index tester, Therm. Power Gener., 1989, No. 3, p. 1.

    Google Scholar 

  17. [17]

    C.L. Qi, J.L. Zhang, X.J. He, K.H. Yan, W.W. Liu, and H. Zhang, Characteristics of Qingxu coal applied in the 4350 m3 blast furnace of Taigang, J. Univ. Sci. Technol. Beijing, 33(2011), No. 1, p. 80.

    CAS  Google Scholar 

  18. [18]

    S.S. Xu and A.G. Zhang, Effect of coal grindability indices in fan mills on fineness of pulverized coal and pressure-head, Power Syst. Eng., 13(1997), No. 1, p. 35.

    Google Scholar 

  19. [19]

    J.P. Smart and T. Nakamura, NOx emissions and burnout from a swirl-stabilized burner firing pulverized coal: The effects of firing coal blends, J. Inst. Energy, 66(1993), p. 99.

    CAS  Google Scholar 

  20. [20]

    T. Wang and G.X. Wang, Study and manufacturing of LTE-II metering instrument for pulverized coal explosibility, J. Wuhan Yejin Univ. Sci. Technol., 20(1997), No. 1, p. 13.

    CAS  Google Scholar 

  21. [21]

    K. Yu, BF Coal Injection, Northeastern University Press, Shenyang, 1995, p. 41.

    Google Scholar 

  22. [22]

    Q.L. Sun, W. Li, D.T. Li, H.K. Chen, B.Q. Li, X.F. Bai, and W.H. Li, Relationship between structure characteristics and thermal conversion property of Shenmu maceral concentrates, J. Fuel Chem. Technol., 31(2003), No. 2, p. 97.

    CAS  Google Scholar 

  23. [23]

    J. Zhang, J.W. Yuan, and Y.Q. Xu, The changes of porosity of macerals during heating, Coal Convers., 22(1999), No. 1, p. 23.

    Google Scholar 

  24. [24]

    P. Chen, M.X. Chen, and Y.L. Tao, Molecular structure of Ruqigou coal—By 13C NMR utilizing MAS/CP and dipole de-phasing techniques, J. Fuel Chem. Technol., 16(1988), No. 3, p. 260.

    CAS  Google Scholar 

  25. [25]

    P. Holbrow, S. Andrews, and G.A. Lunn, Dust explosions in interconnected vented vessels, J. Loss Prev. Process Ind., 9(1996), No. 1, p. 91.

    Article  Google Scholar 

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Jin, Lz., Niu, Xm. Micromorphology and safety properties of meager and meager-lean coal for blast furnace injection. Int J Miner Metall Mater (2021). https://doi.org/10.1007/s12613-020-2104-2

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  • meager coal
  • meager-lean coal
  • microstructure
  • safety property
  • blast furnace injection