Kinetic and equilibrium measurements of coal drying

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The retention, attachment, and release of water (sorption, adsorption, and desorption) in Fruitland subbituminous coal are shown to be very complex phenomena. The vapor pressure and thermodynamic activity of water in the coal at about 315 K vary sharply with composition. Removal of 60% of the water initially present reduces the vapor pressure by about 60%. The total moisture content of saturated coal also varies with temperature. A 10 K rise in temperature reduces the sorbed water by about 8%. There is strong hysteresis in the sorption behavior; water which is desorbed by reducing the vapor pressure over a coal ... continued below

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Pages: 7

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Heller, A. & Elliott, G.R.B. January 1, 1980.

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Description

The retention, attachment, and release of water (sorption, adsorption, and desorption) in Fruitland subbituminous coal are shown to be very complex phenomena. The vapor pressure and thermodynamic activity of water in the coal at about 315 K vary sharply with composition. Removal of 60% of the water initially present reduces the vapor pressure by about 60%. The total moisture content of saturated coal also varies with temperature. A 10 K rise in temperature reduces the sorbed water by about 8%. There is strong hysteresis in the sorption behavior; water which is desorbed by reducing the vapor pressure over a coal sample is not fully replaced by adsorption when the vapor pressure is returned to its original level. These measurements of desorption and adsorption reflect stable and metastable equilibria. Kinetic measurements are reported for approach to a new equilibrium if the vapor pressure over the coal is reduced. The kinetic measurements reflect the shape of the pores while equilibrium vapor pressures reflect how tightly the water is bound in the pores. Both types of measurement show changes in behavior at the same compositions. Implications of these results for UCG are discussed.

Physical Description

Pages: 7

Notes

NTIS, PC A02/MF A01.

Source

  • 6. underground coal conversion symposium, Afton, OK, USA, 13 Jul 1980

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  • Report No.: LA-UR-80-1526
  • Report No.: CONF-800716-5
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5329682
  • Archival Resource Key: ark:/67531/metadc1068432

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1980

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • May 30, 2018, 12:53 p.m.

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Heller, A. & Elliott, G.R.B. Kinetic and equilibrium measurements of coal drying, article, January 1, 1980; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1068432/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.