Measurements and analysis of water adsorption and desorption

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An investigation was carried out on the adsorption and desorption of moisture in chars of low rank coal. Equilibrium moisture sorptions of dry and moist chars were measured at room temperature and relative humidity of 30% and 80%. Based on these measurements, a novel mathematical model was developed to predict both the rate and the level of hydration for coals and chars. The formulation uses a shrinking core model which required only the measurement of the adsorbing material`s equilibrium moisture content at different temperatures and humidities. The model was validated against experimental and literature data. It accurately and reliably predicted ... continued below

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37 p.

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Monazam, E.R.; Shadle, L.J. & Schroeder, K. February 1, 1996.

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  • Monazam, E.R. West Virginia Univ., Morgantown, WV (United States)
  • Shadle, L.J. Morgantown Energy Technology Center, Morgantown, WV (United States)
  • Schroeder, K. Pittsburgh Energy Technology Center, Pittsburgy, PA (United States)

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Description

An investigation was carried out on the adsorption and desorption of moisture in chars of low rank coal. Equilibrium moisture sorptions of dry and moist chars were measured at room temperature and relative humidity of 30% and 80%. Based on these measurements, a novel mathematical model was developed to predict both the rate and the level of hydration for coals and chars. The formulation uses a shrinking core model which required only the measurement of the adsorbing material`s equilibrium moisture content at different temperatures and humidities. The model was validated against experimental and literature data. It accurately and reliably predicted both the rate and extent of hydration and dehydration for coals and char. Using this model, the effects of varying temperatures, relative humidities, and size of the particles and coal pile were simulated. The sensitivity study demonstrated that, as expected, relative humidity and temperature had strong effects on both the rate of hydration and-the equilibrium moisture of coal or char. The particle size dramatically influenced the rate of hydration, but had no affect on the equilibrium moisture content. This model can be used effectively to simulate the impact of moisture on drying, storage, and spontaneous combustion of coals and coal-derived chars.

Physical Description

37 p.

Notes

OSTI as DE96007359

Source

  • 26. international symposium on combustion, Naples (Italy), 28 Jul - 2 Aug 1996

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  • Other: DE96007359
  • Report No.: DOE/METC/C--96/7222
  • Report No.: CONF-960772--3
  • Office of Scientific & Technical Information Report Number: 239313
  • Archival Resource Key: ark:/67531/metadc667505

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  • February 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 2, 2015, 6:26 p.m.

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Monazam, E.R.; Shadle, L.J. & Schroeder, K. Measurements and analysis of water adsorption and desorption, article, February 1, 1996; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc667505/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.