Determination of filter-cake thicknesses from on-line flow measurements and gas/particle transport modeling

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The use of cylindrical candle filters to remove fine ({approx}0.005 mm) particles from hot ({approx}500- 900{degrees}C) gas streams currently is being developed for applications in advanced pressurized fluidized bed combustion (PFBC) and integrated gasification combined cycle (IGCC) technologies. Successfully deployed with hot-gas filtration, PFBC and IGCC technologies will allow the conversion of coal to electrical energy by direct passage of the filtered gases into non-ruggedized turbines and thus provide substantially greater conversion efficiencies with reduced environmental impacts. In the usual approach, one or more clusters of candle filters are suspended from a tubesheet in a pressurized (P {approx_lt}1 MPa) vessel ... continued below

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27 p.

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Smith, D.H.; Powell, V.; Ibrahim, E.; Ferer, M. & Ahmadi, G. December 31, 1996.

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  • Smith, D.H.
  • Powell, V. USDOE Morgantown Energy Technology Center, WV (United States)
  • Ibrahim, E. Oak Ridge Inst. for Science and Education, TN (United States)
  • Ferer, M. West Virginia Univ., Morgantown, WV (United States). Dept. of Physics
  • Ahmadi, G. National Research Council, Washington, DC (United States)

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Description

The use of cylindrical candle filters to remove fine ({approx}0.005 mm) particles from hot ({approx}500- 900{degrees}C) gas streams currently is being developed for applications in advanced pressurized fluidized bed combustion (PFBC) and integrated gasification combined cycle (IGCC) technologies. Successfully deployed with hot-gas filtration, PFBC and IGCC technologies will allow the conversion of coal to electrical energy by direct passage of the filtered gases into non-ruggedized turbines and thus provide substantially greater conversion efficiencies with reduced environmental impacts. In the usual approach, one or more clusters of candle filters are suspended from a tubesheet in a pressurized (P {approx_lt}1 MPa) vessel into which hot gases and suspended particles enter, the gases pass through the walls of the cylindrical filters, and the filtered particles form a cake on the outside of each filter. The cake is then removed periodically by a backpulse of compressed air from inside the filter, which passes through the filter wall and filter cake. In various development or demonstration systems the thickness of the filter cake has proved to be an important, but unknown, process parameter. This paper describes a physical model for cake and pressure buildups between cleaning backpulses, and for longer term buildups of the ``baseline`` pressure drop, as caused by incomplete filter cleaning and/or re-entrainment. When combined with operating data and laboratory measurements of the cake porosity, the model may be used to calculate the (average) filter permeability, the filter-cake thickness and permeability, and the fraction of filter-cake left on the filter by the cleaning backpulse or re-entrained after the backpulse. When used for a variety of operating conditions (e.g., different coals, sorbents, temperatures, etc.), the model eventually may provide useful information on how the filter-cake properties depend on the various operating parameters.

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27 p.

Notes

OSTI as DE97050691

Source

  • Advanced coal-fired power systems review meeting, Morgantown, WV (United States), 16-18 Jul 1996

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  • Other: DE97050691
  • Report No.: DOE/METC/C--97/7276
  • Report No.: CONF-960757--51
  • Office of Scientific & Technical Information Report Number: 432362
  • Archival Resource Key: ark:/67531/metadc679808

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 10, 2015, 7:24 p.m.

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Smith, D.H.; Powell, V.; Ibrahim, E.; Ferer, M. & Ahmadi, G. Determination of filter-cake thicknesses from on-line flow measurements and gas/particle transport modeling, article, December 31, 1996; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc679808/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.