The Effects of a Type and Concentration of Coal and Additive on the Rheological Characteristics of CWM

석탄의 종류, 농도 및 첨가제가 석탄-물 혼합연료의 유동특성에 미치는 영향

  • 김수호 (충북대학교 공과대학 화학공학과) ;
  • 황갑성 (충청전문대학 환경공업과) ;
  • 홍성선 (충북대학교 공과대학 화학공학과)
  • Received : 1997.04.09
  • Accepted : 1997.07.07
  • Published : 1997.08.10

Abstract

We investigated that how both the type and the concentration of coal and the surfactant and the electrolyte added to increase the fluidity of CWM influence rheological characteristics. According to the type of coal, the viscosity of CWM was increased with increasing O/C ratio. Also, the CWM was represented the property of non-Newtonian fluid, having yield stress which was linerarly increased with increasing coal concentration. According to the surfactant used as an additive, the rheological characteristics of CWM was represented the pseudoplastic property as n<1 without relating to the concentration of added surfactants. Also, according to the increase of the amount of electrolyte, n was nearly approached 1. Therfore, we found that CWM opproched Newtonian fluid and that when more than 0.05wt.% of electrolyte were added, yield stress was not shown up.

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References

  1. Principles of Combustion Engineering for Boilers C. J. Lawn
  2. Hwahak Konghak v.33 N. S. Roh;K. H. Kim;D. C. Kim
  3. Energy Engg. J. v.4 N. S. Roh;D. H. Shin;J. D. Kim;K. H. Kim;D. C. Kim
  4. Proc. of the 11th Inc. Conf. on Slurry Technology Rhelogical Properties Significant for the Atomization of Coal-Water Fuels W. G. Rakitsky;E. W. Knell;T. J. Murphy;Hilton Hear, S. C.
  5. Proc. of the 7th Int. Symp. on Coal Slurry Combustion and Technology A Yield Stress of CWF M. E. Morgan;H. L. Heaton;R. S. Scheffee
  6. AIChE J. v.33 R. Kaji;Y. Muranaka;H. Miyadera;Y. Hishinuma
  7. Report, Korea Electric Power Coporation, KRC-85G-J04 A Study on Combustion and Technology of Coal-Water mixture Fuels P. S. Ji(et al.)
  8. Hydraulic Design for Flow of Complex Fluids R. W. Hanks
  9. Proc. of the 2nd European Conf. on Coal Lipuid Mixtures Use of Surfactants and Polymers for Preparation and Stabilization of Coal Suspensions T. F. Tadros
  10. The Flow of Complex Mixture in Pipes G. W. Govier;K. Aziz