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The Influence of High Solids Loading and Scale on Coal Slurry Just-Suspended Agitation

Liu, Hong
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406808144

Abstract Details

2014, Master of Science (M.S.), University of Dayton, Chemical Engineering.
The just-suspended condition is often regarded as the optimum criterion for liquid-solid agitation in chemical industries for processes such as crystallizing and dissolution. Compared to uniform suspension in which the solids are dispersed throughout a liquid phase, just-suspended agitation reduces power consumption and equipment investment while exposing the entire solid surface to surrounding liquid. In this research, the characteristics of coal powders just suspended in water prior to transportation in pipelines were studied. Zwietering developed a correlation for just-suspended speed that indicated that it was affected by different parameters, such as solid and liquid properties and impeller features, with each effect being presumed to be independent. However, this correlation was developed based on limited data such as low solid loading. In the current study, the solids loading exponent reflecting the effect of high solids concentration on just suspended speed is contrasted with Zwieterings’ correlation. Also, effort was devoted to exploring the influence of scale-up in coal slurry just-suspended agitation. The solids loading exponents of this study were higher than those found by Zwietering, and the solids loading exponent increased at higher solids loadings. The solids loading exponent was studied specifically in three ranges of Zwietering’s solids loading from low (0.25 to 5), moderate (5 to 33) to high (33 to 100) and the higher the solids loading, the higher the exponent. Additionally, the solids loading exponent was observed to depend on scale (i.e. – vessel size), with the solids loading exponent decreasing with increasing scale. This indicates that, contrary to the Zwietering correlation of the just-suspended speed, the effects of different parameters on the just-suspended speed are not independent. The scale-up exponent that describes the effect of scale on the just-suspended speed was found to depend on solids loading, with the scale-up exponent increasing with increasing solids loading.
Kevin Myers (Advisor)
Robert Wilkens (Committee Member)
Eric Janz (Committee Member)
Chemical Engineering; Engineering
Solids loading; just-suspended speed; solids loading exponent; scale-up; scale-up exponent

Recommended Citations

Citations

  • Liu, H. (2014). The Influence of High Solids Loading and Scale on Coal Slurry Just-Suspended Agitation [Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406808144

    APA Style (7th edition)

  • Liu, Hong. The Influence of High Solids Loading and Scale on Coal Slurry Just-Suspended Agitation. 2014. University of Dayton, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406808144.

    MLA Style (8th edition)

  • Liu, Hong. "The Influence of High Solids Loading and Scale on Coal Slurry Just-Suspended Agitation." Master's thesis, University of Dayton, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406808144

    Chicago Manual of Style (17th edition)

dayton1406808144
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This open access ETD is published by University of Dayton and OhioLINK.