Development of a Gas-Promoted Oil Agglomeration Process

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The preliminary laboratory-scale development of a gas-promoted, oil agglomeration process for cleaning coal was carried out with scale model mixing systems in which aqueous suspensions of ultrafine coal particles were treated with a liquid hydrocarbon and a small amount of air. The resulting agglomerates were recovered by screening. During a batch agglomeration test the progress of agglomeration was monitored by observing changes in agitator torque in the case of concentrated suspensions or by observing changes in turbidity in the case of dilute suspensions. Dilute suspensions were employed for investigating the kinetics of agglomeration, whereas concentrated suspensions were used for determining ... continued below

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Nelson, C.; Zhang, F.; Drzymala, J.; Shen, M.; Abbott, R. & Wheelock, T. D. November 1997.

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  • Federal Energy Technology Center (U.S.)
    Publisher Info: Federal Energy Technology Center, Morgantown, WV, and Pittsburgh, PA; Federal Energy Technology Center-Pittsburgh (FETC-PGH)
    Place of Publication: Pittsburgh, Pennsylvania

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Description

The preliminary laboratory-scale development of a gas-promoted, oil agglomeration process for cleaning coal was carried out with scale model mixing systems in which aqueous suspensions of ultrafine coal particles were treated with a liquid hydrocarbon and a small amount of air. The resulting agglomerates were recovered by screening. During a batch agglomeration test the progress of agglomeration was monitored by observing changes in agitator torque in the case of concentrated suspensions or by observing changes in turbidity in the case of dilute suspensions. Dilute suspensions were employed for investigating the kinetics of agglomeration, whereas concentrated suspensions were used for determining parameters that characterize the process of agglomeration. A key parameter turned out to be the minimum time te required to produce compact spherical agglomerates. Other important parameters included the projected area mean particle diameter of the agglomerates recovered at the end of a test as well as the ash content and yield of agglomerates. Batch agglomeration tests were conducted with geometrically similar mixing tanks which ranged in volume from 0.346 to 11.07 liters. Each tank was enclosed to control the amount of air present. A variable speed agitator fitted with a six blade turbine impeller was used for agitation. Tests were conducted with moderately hydrophobic Pittsburgh No. 8 coal and with more hydrophobic Upper Freeport coal using either n-heptane, i-octane, or hexadecane as an agglomerant.

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  • Other: DE00001401
  • Report No.: DE-FG22-93PC93209--17
  • Grant Number: FG22-93PC93209
  • DOI: 10.2172/1401 | External Link
  • Office of Scientific & Technical Information Report Number: 1401
  • Archival Resource Key: ark:/67531/metadc622228

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 1997

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Nov. 23, 2016, 3:29 p.m.

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Nelson, C.; Zhang, F.; Drzymala, J.; Shen, M.; Abbott, R. & Wheelock, T. D. Development of a Gas-Promoted Oil Agglomeration Process, report, November 1997; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc622228/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.