Korea-Australia Rheology Journal

  • 제13권1호
  • /
  • Pages.47-54
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  • 2001
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  • 1226-119X(pISSN)
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  • 2093-7660(eISSN)
한국유변학회 (The Korean Society of Rheology)
권호 표지

Rheology and pipeline transportation of dense fly ash-water slurry

  • Usui, Hiromoto (Department of Chemical Science and Technology, Kobe University) ;
  • Li, Lei (Department of Chemical Science and Technology, Kobe University) ;
  • Suzuki, Hiroshi (Department of Chemical Science and Technology, Kobe University)
  • 발행 : 2001.03.01
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초록

Prediction of the maximum packing volume fraction with non-spherical particles has been one of the important problems in powder technology. The sphericity of fly ash particles depending on the particle diameter was measured by means of a CCD image processing instrument. An algorithm to predict the maximum packing volume fraction with non-spherical particles is proposed. The maximum packing volume fraction is used to predict the slurry viscosity under well dispersed conditions. For this purpose, Simha's cell model is applied for concentrated slurry with wide particle size distribution. Also, Usui's model developed for aggregative slurries is applied to predict the non-Newtonian viscosity of dense fly ash - water slurry. It is certified that the maximum packing volume fraction for non-spherical particles can be successfully used to predict slurry viscosity. The pressure drop in a pipe flow is predicted by using the non-Newtonian viscosity of dense fly ash-water slurry obtained by the present model. The predicted relationship between pressure drop and flow rate results in a good agreement with the experimented data obtained for a test rig with 50 mm inner diameter tube. Base on the design procedure proposed in this study, a feasibility study of fly ash hydraulic transportation system from a coal-fired power station to a controlled deposit site is carried out to give a future prospect of inexpensive fly ash transportation technology.

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참고문헌

  1. Int. J. Storing, Handling and Processing Powder v.5 Experiences with dense phase hydraulic coveying of vales point fly ash Bunn, T. F.;A. J. Chambers
  2. Coal Preparation-A Multinational J. v.21 Maximum packing concentration of coal water mixtures Chryss, A. G.;S. N. Bhattacharya
  3. J. Paint Technol. v.42 Packing of spheres and its effect on the viscosity of suspension Lee, D. I.
  4. J. Appl. Phys. v.23 A Treatment of the viscosity of concentrated suspensions Simha, R.
  5. Powder Technology. v.35 Estimation of the co-ordinate numbers in a multi-component mixtures of spheres Suzuki, M.;T. Oshima
  6. J. Non-Newtonian Fluid Mech. v.60 A Thixotropy model for coal-water mixtures Usui, H.
  7. Kagaku Kogaku Ronbunshu. v.25 A rheological model for an agglomerative slurry of mono-modal silica particles Usui, H.
  8. Kagaku Kogaku Ronbunshu. v.26 Viscosity prediction of agglomerative slurries with particle size distribution Usui, H.;K. Kishimoto;H. Suzuki
  9. J. Chem. Eng. Japan. v.33 Prediction of flow characteristics of whipped cream under pressurized condition Usui, H.;T. Kobayashi;H. Suzuki
  10. Coal Preparation J. v.21 The Bayswater fly ash transportation system Ward, A.;T. Bunn;A. J. Chambers
  11. Ind. Eng. Chem. Res. v.30 Estimation of the porosity of particle mixtures by a linear-mixture packing model Yu, A. B.;N. Standish