Power Requirements for Ultrafine Grinding and Drying of Low-Rank Coals in a Fluid-Energy Mill

  • C. W. Bouchillon
  • W. G. Steele
  • J. D. Burnett


An experimental evaluation of the power requirements for simultaneous ultrafine grinding and drying of low-rank coals in a fluid-energy mill was undertaken. Two different lignites and a subbituminous coal were used in the study. Ultrafine grinding tests were conducted with air nominally at ambient conditions and with steam at temperatures ranging from 225°F to 488°F. It was found that the power required for grinding and drying increased linearly with the grinding medium temperature.


Power Requirement Superheated Steam Feed Flow Rate Grand Fork Mill Temperature 


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  1. 1.
    A.E. Margulies, G.F. Moore, and R.J. West, “Ultrafine Pulverized Coal as an Alternate Fuel for Oil and Gas Fired Boilers,” 9th Energy Technology Conference, Washington, DC, February, 1982.Google Scholar
  2. 2.
    R.J. West, G. Haider, T.A. Morris, A.E. Margulies, and G.F. Moore, “Potential of Micronized Coal as an Alternate Fuel in Oil-and Gas-Fired Boilers,” International Symposium on Conversion to Solid Fuels, Newport Beach, CA, October 26–28, 1982.Google Scholar
  3. 3.
    L. Nail, “Coal/Steam Burning Status Report,” Southeastern Electric Exchange 1984 Conference, Bal Harbour, FL, April 12, 1984.Google Scholar
  4. 4.
    J.L. Hartness, and M.M. Koeroghlian, “Dry Micronized Coal Applications Progress Report on a Utility Station Gas-Fired Boiler,” 7th International Coal and Lignite Conference and Exhibition, Houston, TX, November 13–15, 1984.Google Scholar
  5. 5.
    J.J. Kowalczewski, P.D. Bandopandhayay, R.J. Downie, and W.R. Read, “Ultra Fine Grinding of Australian Brown Coal for Use in Diesel Engines,” Fifth International Symposium on Coal Slurry Combustion and Technology, Tampa, FL, April 25–27, 1983.Google Scholar
  6. 6.
    W.G. Steele, C.W. Bouchillon, J.A. Clippard, and J.L. Hartness, “Evaluation of the Micropulverization of Mississippi Lignite,” Twelfth Biennial International Meeting on Technology and Utilization of Low-Rank Coals, Grand Forks, ND, May 18–19, 1983.Google Scholar
  7. 7.
    C.W. Bouchillon, W.G. Steele, J.A. Clippard, and J.D. Burnett, “Evaluation of the Micropulverization, Drying and Beneficiation of Lignite,” 6th International Coal and Lignite Utilization Exhibition and Conference, Houston, TX, November 15–17, 1983.Google Scholar
  8. 8.
    W.G. Steele, C.W. Bouchillon, and R.B. Ross, “Beneficiation Processes for Ultrafinely Ground Low Rank Coals,” Thirteenth Biennial Lignite Symposium on Technology and Use of Low-Rank Coals, Bismarck, ND, May 21–23, 1985.Google Scholar
  9. 9.
    D.W. Taylor, “Comminution of Pulverulent Material by Fluid Energy,” U. S. Patent Number 4,219, 164, August 1984.Google Scholar
  10. 10.
    J.H. Keenan, and F.G. Keyes, Thermodynamic Properties of Steam, John Wiley and Sons, Inc., New York, 1936.Google Scholar
  11. 11.
    R.E. Sonntag, and G.J. Van Wylen, Introduction to Thermodynamics: Classical and Statistical, John Wiley and Sons, Inc., New York, 1971.Google Scholar
  12. 12.
    B. Stanmore, D.N. Baraia, and L.E. Paulson, “Steam Drying of LigniteA Review of Processes and Performance,” Report No. DOE/GFETC/RI-82/1, Grand Forks Energy Technology Center, Grand Forks, ND, 1982.Google Scholar
  13. 13.
    R.C. Ellman, J.W. Belter, and L. Dockter, “Effects of In-the-Mill Drying on Pulverization Characteristics of Lignite,” Bureau of Mines Report of Investigations, 6074, U. S. Department of the Interior, Bureau of Mines, 1962.Google Scholar

Copyright information

© Elsevier Science Publishing Co., Inc. 1990

Authors and Affiliations

  • C. W. Bouchillon
    • 1
  • W. G. Steele
    • 1
  • J. D. Burnett
    • 2
  1. 1.Mississippi State UniversityMississippi StateUSA
  2. 2.Micro-Energy/Ergon, Inc.VicksburgUSA

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