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Reduction of NOx emission based on optimized proportions of mill scale and coke breeze in sintering process

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Abstract

Reducing NOx emission of iron ore sintering process in a cost effective manner is a challenge for the iron and steel industry at present. Effects of the proportion of mill scale and coke breeze on the NOx emission, strength of sinter, and sinter indexes were studied by combustion and sinter pot tests. Results showed that the peak value of NO concentration, total of NO emission, and fuel-N conversion rate gradually decreased as the proportions of the mill scale increased because NO was reduced to N2 by Fe3O4, FeO, and Fe in the mill scale. The strength of sinter reached the highest value at 8.0wt% mill scale due to the formation of minerals with low melting point. The fuel-N conversion rate slightly fluctuated and total NOx emission significantly decreased with the decreased proportions of coke breeze because CO formation and content of N element in the sintered mixture decreased. However, the sinter strength also decreased due to the decrease in the amount of the melting minerals. Furthermore, results of the sinter pot tests indicated that NOx emission decreased. The sinter indexes performed well when the proportions of mill scale and coke breeze were 8.0wt% and 3.70wt% respectively in the sintered mixture.

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References

  1. J.M. Qie, C.X. Zhang, H.F. Wang, X.P. Li, and X.Y. Shi, Analysis of emission situation and emission reduction technology of typical sintering flue gas pollutants, Sintering Pelletizing, 41(2016), No. 6, p. 59.

    Google Scholar 

  2. Y.D. Su, X.W. Li, and X.H. Fan, Research progress of NOx reduction technology in sintering process, Sintering Pelletizing, 38(2013), No. 6, p. 41.

    Google Scholar 

  3. S.L. Wu, Z.G. Que, B. Su, and Y.Z. Zhang, Research progress of the “in-bed-de NOx” technology in iron ore sintering, J. Eng. Stud., 9(2017), No. 1, p. 61.

    Google Scholar 

  4. B.J. Yan, Y. Xing, P. Lu, W. Su, B. Jiang, and X.X. Cui, A critical review on the research progress of multi-pollutant collaborative control technologies of sintering flue gas in the iron and steel industry, Chin. J. Eng., 40(2018), No. 7, p. 767.

    Google Scholar 

  5. X.M. Yan, Y.R. Li, T.Y. Zhu, and F. Qi, Review of emission and simultaneous control of multiple pollutants from iron-steel sintering flue gas, J. Environ. Eng. Technol., 5(2015), No. 2, p. 85.

    CAS  Google Scholar 

  6. H.L. Zhang, Q. Shi, H.M. Long, J.X. Li, T.J. Chun, and Z.F. Gao, Analysis of NOx removal process in sintering flue gas, Iron Steel, 52(2017), No. 5, p. 100.

    CAS  Google Scholar 

  7. G. Suzuki, R. Ando, H. Yoshikoshi, Y. Yamaoka, and S. Nagaoka, A study of the reduction of NOx in the waste gas from sinter plant, Tetsu-to-Hagane, 61(1975), No. 13, p. 2775.

    Article  CAS  Google Scholar 

  8. H. Hu, H. Huang, Z.W. Zeng, J.L. Zhang, S. Annanurov, and Q.Z. Zhao, The formation of NOx during sintering, Eneggy Sources A, 39(2017), No. 12, p. 1228.

    Article  CAS  Google Scholar 

  9. C.B. Xu, S.L Wu, and D.Q. Cang, Numerical modeling of NO formation during packed-bed combustion of coke granules, J. Univ. Sci. Technol. Beijing, 7(2000), No. 4, p. 261.

    CAS  Google Scholar 

  10. Y. Hida, M. Sasaki, T. Enokido, Y. Umezu, T. Iida, and S. Uno, Effect of the existing state of coke breeze in quasi-particles of raw mix on coke combustion in the sintering process, Tetsu-to-Hagane, 68(1982), No. 3, p. 400.

    Article  CAS  Google Scholar 

  11. E. Kasai and Y. Omori, Combustion rate of coke at different existing states prepared by fine alumina, Tetsu-to-Hagane, 72(1986), No. 10, p. 1537.

    Article  CAS  Google Scholar 

  12. P.L. Hou, S.M. Choi, W. Yang, E.S. Choi, and H.J. Kang, Application of intra-particle combustion model for iron ore sintering bed, Mater. Sci. Appl., 2(2011), No. 5, p. 370.

    CAS  Google Scholar 

  13. K.I. Ohno, K. Noda, K. Nishioka, T. Maeda, and M. Shimizu, Combustion rate of coke in quasi-particle at iron ore sintering process, Tetsu-to-Hagane, 101(2015), No. 3, p. 184.

    Article  Google Scholar 

  14. P.N. Ma, M. Cheng, M.X. Zhou, Y.W. Li, and H. Zhou, Combustion characteristics of different types of quasi-particles in iron ore sintering process, Chin. J. Eng., 41(2019), No. 3, p. 316.

    Google Scholar 

  15. J. Pan, Theoretical and Process Studies of the Abatement of Flue Gasemissions during Iron Ore Sintering [Dissertation], Central South University of Technology, Changsha, 2007.

    Google Scholar 

  16. Z.G. Que, J.S. Wang, X.B. Ai, and S.L. Wu, Reduction of NOx emission in sintering process based on optimization of solid fuels particle size, China Metall., 29(2019), No. 6, p. 8.

    Google Scholar 

  17. S.L. Wu, Y.Z. Zhang, B. Su, X.M. Wang, and L. Zhang, Analysis of main factors affecting NOx emissions in sintering process, Chin. J. Eng., 39(2017), No. 5, p. 693.

    CAS  Google Scholar 

  18. Z.G. Que, S.L. Wu, G.L. Zhang, B. Su, and Y.Z. Zhang, Effect of mill scale adding methods on NOx emission of coke combustion during iron ore sintering, [in] AISTech and ICSTI 2015, Cleveland, 2015, p. 1406.

  19. E. Kasai, S.L. Wu, T. Sugiyama, S. Inaba, and Y. Omori, Combustion rate and NO emission during combustion of coke granules in packed beds, Tetsu-to-Hagane, 78(1992), No. 7, p. 1005.

    Article  CAS  Google Scholar 

  20. Z.G. Que, S.L. Wu, and X.B. Ai, To reduce NOx ermssion based on optimizing the existing states of coarse coke breeze during iron ore sintering process, Chin. J. Eng., 42(2020), No. 2, p. 163.

    Google Scholar 

  21. M.S. Lee and S.C. Shim, Influence of lime/limestone addition on the SO2 and NO formation during the combustion of coke pellet, ISIJ Int., 44(2004), No. 3, p. 470.

    Article  CAS  Google Scholar 

  22. K. Katayama and S. Kasama, Influence of lime coating coke on NOx concentration in sintering process, ISIJ Int., 56(2016), No. 9, p. 1563.

    Article  CAS  Google Scholar 

  23. M.Y. Gan, Z.N. Wei, C.G. Shi, H. Liu, M.F. Zhu, and T.J. Chun, Influences of fuel modified using burnt lime on NOx emission in burning and sintering process, J. Iron Steel Res., 31(2019), No. 9, p. 816.

    Google Scholar 

  24. Y.G. Chen, Z.C. Guo, Z. Wang, and G.S. Feng, NOx reduction in the sintering process, Int. J. Miner. Metall. Mater., 16(2009), No. 2, p. 143.

    Article  Google Scholar 

  25. Y.G. Chen, Z.C. Guo, and G.S. Feng, NOx reduction by coupling combustion with recycling flue gas in iron ore sintering process, Int. J. Miner. Metall. Mater., 18(2011), No. 4, p. 390.

    Article  CAS  Google Scholar 

  26. M. Gan, X.H. Fan, W. Lv, X.L. Chen, Z.Y. Ji, T. Jiang, Z.Y. Yu, and Y. Zhou, Fuel pre-granulation for reducing NOx emissions from the iron ore sintering process, Powder Technol., 301(2016), p. 478.

    Article  CAS  Google Scholar 

  27. W. Lv, X.H. Fan, X.B. Min, M. Gan, X.L. Chen, and Z.Y. Ji, Formation of nitrogen mono oxide (NO) during iron ore sintering process, ISIJ Int., 58(2018), No. 2, p. 236.

    Article  CAS  Google Scholar 

  28. Z.Y. Yu, X.H. Fan, M. Gan, and X.L. Chen, Effect of Ca-Fe oxides additives on NOx reduction in iron ore sintering, J. Iron Steel Res. Int., 24(2017), No. 12, p. 1184.

    Article  Google Scholar 

  29. K. Morioka S. Inaba, M. Shimizu, K. Ano, and T. Sugiyama, Primary application of the “in-bed-deNOx” process using Ca-Fe oxides in iron ore sintering machines, ISIJ Int., 40(2000), No. 3, p. 280.

    Article  CAS  Google Scholar 

  30. W. Xiong, J.Y. Liao, X.G. Bi, and G.F. Zhou, Experiment study of the de-NOx in sintering waste gas, Sintering Pelletizing, 32(2007), No. 1, p. 12.

    CAS  Google Scholar 

  31. S.L. Wu, T. Sugiyama, K. Morioka, E. Kasai, and Y. Omori, Elimination reaction of NO gas generated from coke combustion in iron ore sinter bed, Tetsu-to-Hagane, 80(1994), No. 4, p. 276.

    Article  CAS  Google Scholar 

  32. B.V. Reddy and S.N. Khanna, Self-stimulated NO reduction and CO oxidation by iron oxide clusters, Phys. Rev. Lett., 93(2004), No. 6, art. No. 068301.

  33. E. Kasai, T. Sugiyama, and Y. Omori, Reduction of the amount of nitrogen oxides formed during sintering by using coke prepared from the mixture of coal and iron ore, Tetsu-to-Hagane, 80(1994), No. 4, p. 282.

    Article  CAS  Google Scholar 

  34. M. Nakano, T. Yamakawa, N. Hayakawa, and M. Nagabuchi, Effects of metallic iron bearing resources on iron ore sintering, ISIJ Int., 38(1998), No. 1, p. 16.

    Article  CAS  Google Scholar 

  35. S.L. Wu, G.L. Zhang, S.G. Chen, and B. Su, Influencing factors and effects of assimilation characteristic of iron ores in sintering process, ISIJ Int., 54(2014), No. 3, p. 582.

    Article  CAS  Google Scholar 

  36. G.L. Zhang, S.L. Wu, B. Su, Z.G. Que, C.G. Hou, and Y. Jiang, Influencing factor of sinter body strength and its effects on iron ore sintering indexes, Int. J. Miner. Metall. Mater., 22(2015), No. 6, p. 553.

    Article  CAS  Google Scholar 

  37. C.C. Yang, D.Q. Zhu, J. Pan, and Y. Shi, Some basic properties of granules from ore blends consisting of ultrafine magnetite and hematite ores, Int. J. Miner. Metall. Mater., 26(2019), No. 8, p. 953.

    Article  CAS  Google Scholar 

  38. F. Zhang, D.Q. Zhu, J. Pan, Y.P. Mo, and Z.Q. Guo, Improving the sintering performance of blends containing Canadian specularite concentrate by modifying the binding medium, Int. J. Miner. Metall. Mater., 25(2018), No. 6, p. 598.

    Article  Google Scholar 

  39. S.L. Wu, B. Su, Y.H. Qi, Y. Li, and B.B. Du, Major melt formation characteristic factor analysis of iron ore liquid phase fluidity during the sintering process, Chin. J. Eng., 40(2018), No. 3, p. 321.

    Google Scholar 

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51904127), the Natural Science Foundation of Jiangxi Province, China (No. 20192BAB216018), and the research and development Project (No. 2018-YYB-05) and collaborative innovation Project (No. 2018-XTPH1-05) of Jiangxi Academy of Sciences, China.

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Authors and Affiliations

  1. Institute of Energy Research, Jiangxi Academy of Science, Nanchang, 330096, China

    Zhi-gang Que & Xian-bin Ai

  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Zhi-gang Que & Sheng-li Wu

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Correspondence to Zhi-gang Que.

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Que, Zg., Ai, Xb. & Wu, Sl. Reduction of NOx emission based on optimized proportions of mill scale and coke breeze in sintering process. Int J Miner Metall Mater 28, 1453–1461 (2021). https://doi.org/10.1007/s12613-020-2103-3

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  • DOI: https://doi.org/10.1007/s12613-020-2103-3

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