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.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
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.
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.
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.
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.
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.
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.
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.
M.S. Bi and H.Y. Wang, Experiment on methane-coal dust explosions, J. China Coal Soc., 33(2008), No. 7, p. 784.
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.
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.
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.
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.
D.X. Han, China Coal Petrology, China University of Mining and Technology Press, Xuzhou, 1996, p. 55.
J. Cheng, A.N. Zhou, and J.W. Li, Development of coal structure, Coal Convers., 24(2001), No. 4, p. 1.
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.
W.M. Fang and L.L. Pan, Development of VTI grindability index tester, Therm. Power Gener., 1989, No. 3, p. 1.
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.
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.
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.
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.
K. Yu, BF Coal Injection, Northeastern University Press, Shenyang, 1995, p. 41.
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.
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.
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.
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.
About this article
Cite this article
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
- meager coal
- meager-lean coal
- safety property
- blast furnace injection