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The effect of blending of bituminous and sub-bituminous coals on ash fusibility and deposition formation

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Abstract

Coal is an important energy source whose consumption increases continuously. One of the many ways to use coal is coal blending, which is a very effective technique in power stations. However, coal blending generates unsuspected problems, one of which is ash deposition that causes slagging and fouling. In fact, most blends accelerate and generate heavier ash depositions than their parent coals.

This work investigates the characteristics of ash behavior including fusibility and deposition when blending both bituminous and subbituminous coals in a pulverized coal combustion. Two coals used in Japan were used for this study: bituminous (Bit-A) and subbituminous coal (Sub-A). In order to investigate, the blending ratio was changed. A Thermomechanical analysis (TMA) and a Drop tube furnace (DTF) were used for ash fusibility and deposit, respectively. Ash components were determined using X-ray fluorescence at the coal research center of Idemitsu Kosan Co., Ltd., in Japan. These tests revealed that as the blending ratio of Sub-A increased, fusibility in the TMA and the melting propensity increased. Capture efficiency and energy-based growth increased with the blending ratio, and were highest at 80%. Finally, a new approach based on the relation between ash fusibility and deposit derived for predicting adhesion tendency on blended coals was created by deriving the relation between the fusibility and deposit results that affected slag formation.

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References

  1. [1]

    World coal association, www.worldcoal.org/coal/marketamp-transportation.

  2. [2]

    J. D. Kim, G. B. Kim, Y. J. Chang, J. H. Song and C. H. Jeon, Examination of flame length for burning pulverized coal in laminar flow reactor, JMST, 24 (2010) 2567–2575.

  3. [3]

    G. W. Bryant, G. J. Browning, H. Emanuel, S. K. Gupta, R. P. Gupta, J. A. Lucas and T. F. Wall, The fusibility of blending coal ash, Energy Fuel, 14 (2000) 316–325.

  4. [4]

    B. H. Lee, E. G. Eddings and C. H. Jeon, Effect of coal blending methods with different excess oxygen on unburned carbon and NOx emissions in an entrained flow reactor, Energy Fuel, 26 (2012) 6803–6814.

  5. [5]

    A. Rushdi, A. Sharma and R. Gupta, An experimental study of the effect of coal blending on ash deposition, Fuel, 83 (2004) 495–506.

  6. [6]

    H. L. Wee, H. Wu, D. Zhang and D. French, The effect of combustion conditions on mineral matter transformation and ash deposition in a utility boiler fired with a sub-bituminous coal, Proc. Combust. Inst., 30 (2005) 2981–2989.

  7. [7]

    S. Su, J. H. Pohl, D. Holcombe and J. A. Hart, Slagging propensities of blended coals, Fuel, 80 (2001) 1351–1360.

  8. [8]

    L. L. Baxter, Influence of ash deposit chemistry and structure on physical and transport properties, Fuel Process. Technol., 56 (1998) 81–88.

  9. [9]

    J. M. Beer, A. F. Sarofim and L. E. Barta, Inorganic transformations and ash deposition during combustion, Engineering Foundation, ASME, New York, USA (1992).

  10. [10]

    J. R. Fan, X. D. Zha, P. Sun and K. F. Cen, Simulation of ash deposit in a pulverized coal-fired boiler, Fuel, 80 (2001) 645–654.

  11. [11]

    M. U. Degereji, D. B. Ingham, L. Ma, M. Pourkashanian and A. Williams, Prediction of ash slagging propensity in a pulverized coal combustion furnace, Fuel, 101 (2012) 171–178.

  12. [12]

    A. Saljnikov, B. Vucicevic, M. Komatina, M. Gojak, D Goricanec and Z. Stevanovic, Spectroscopic research on infrared emittance of coal ash deposits, Exp. Therm. Fluid. Sci., 33 (2009) 1133–1141.

  13. [13]

    T. R. West, Geology applied to engineering, Waveland Press, Illinois, USA (2010).

  14. [14]

    B. H. Lee, J. H. Song, R. G. Kim, S. G. Kim, Y. G. Kim, Y. J. Chang and C. H. Jeon, Simulation of the influence of the coal volatile matter content on fuel NO emissions in a droptube furnace, Energy Fuel, 24 (2010) 4333–4340.

  15. [15]

    J. Barroso, J. Ballester, L. M. Ferrer and S. Jiménez, Study of coal ash deposition in an entrained flow reactor: Influence of coal type, blend composition and operating conditions, Fuel Process. Technol., 87 (2006) 737–752.

  16. [16]

    H. L. Wee, H. Wu, D. Zhang and D. French, The effect of combustion conditions on mineral matter transformation and ash deposition in a utility boiler fired with a sub-bituminous coal, Proc. Combust. Inst., 30 (2005) 2981–2989.

  17. [17]

    S. K. Gupta, R. P. Gupta, G. W. Bryant, L. A. Juniper and T. F. Wall, Impact of mineral matter in solid fuel combustion, Kluwer Academic/Plenum Publishers, Hawaii, USA (1997).

  18. [18]

    R. Bandyopadhyay, S. Gupta, B. Lindblom, S. Jonsson, D. French and V. Sahajwalla, Assessment of ash deposition tendency in a rotary kiln using thermomechanical analysis and experimental combustion Furnace, Fuel, 135 (2014) 301–307.

  19. [19]

    G. P. Huffman, F. E. Huggins and G. R. Dunmyre, Investigation of the high-temperature behaviour of coal ash in reducing and oxidizing atmospheres, Fuel, 60 (1981) 585–597.

  20. [20]

    S. Z. Yong, Multiphase models of slag layer built-up in solid fuel gasification and combustion, Ph.D. Thesis, MIT (2010).

  21. [21]

    H. Namkunga, L. H. Xu, W. C. Shina, T. J. Kanga and H. T. Kim, Study on deposition tendency of coal ash under various gasification environments through DTF, Fuel, 117 (2014) 1274–1280.

  22. [22]

    L. Zhang and S. Jahanshahi, Modelling viscosity of alumina-containing silicate melts, Scand. J. Metall., 30 (2001) 364–369.

  23. [23]

    M. Y. Hwang, Prediction of combustion characteristics and deposition propensity in wall-fired boiler using advanced coal analysis, Ph.D. Thesis, Pusan National University (2015).

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Author information

Correspondence to Chung-Hwan Jeon.

Additional information

Ho Lim received his B.S. in Mechanical Engineering from Kumoh Institute of Technology, 2009. He then received his M.S. degree from Pusan National University in 2011. He is currently a Ph.D. student at Pusan National University.

Lkhagvadorj Shagdarsuren received his B.S. in Mechanical Engineering from Mongolian University of Science and Technology, 2008. He is currently an Integrated Ph.D. course student at Pusan National University.

Seung-Mo Kim received his B.S. (1999) and M.S. (2001) in Environmental Engineering from Hoseo University. He then received his Ph.D. degree in Mechanical Engineering from Osaka University in 2004. Dr. Kim is currently a research professor at Pusan Clean Coal Center at Pusan National University.

Akihiro Hoshino received his B.S. from Kanazawa University in 2006. He then received his M.S. degree in Chemical Engineering from Gunma University in 2008. He is currently a research engineer at the Coal & Environment Research Laboratory of Idemitsu Kosan Co., Ltd.

Toru Yamashita received his M.S. in Mineral Resources and Material Engineering from Waseda University in 1989. He then received his Ph.D. degree in Chemical Engineering from Chubu University in 2008. He is currently a general manager at the Coal & Environment Research Laboratory of Idemitsu Kosan Co., Ltd.

Chung-Hwan Jeon received his B.S. (1985), M.S. (1987) and Ph.D. (1994) degrees from Pusan National University. Dr. Jeon is currently a professor in the school of Mechanical Engineering at Pusan National University, and is currently serving as a director of Pusan Clean Coal Center.

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Lim, H., Shagdarsuren, L., Kim, S. et al. The effect of blending of bituminous and sub-bituminous coals on ash fusibility and deposition formation. J Mech Sci Technol 30, 1413–1420 (2016). https://doi.org/10.1007/s12206-016-0249-8

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Keywords

  • Ash component
  • Blending
  • Coal ash
  • Deposit
  • Fusibility