Coal combustion: Effect of process conditions on char reactivity. Quarterly technical report, July 1, 1994--September 30, 1994

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Description

The project will quantify the effect of the following pyrolysis conditions on the macropore structure and on the subsequent reactivity of chars: (a) pyrolysis heating rate; (b) final heat treatment temperature (HTT); (c) duration of heat treatment at HTT (or soak time); (d) pyrolysis atmosphere (N{sub 2} or O{sub 2}/N{sub 2} mixtures); (e) coal particle size (100-1,000 {mu}m in diameter); (f) sulfur-capturing additives (limestone); and (g) coal rank. Pyrolysis experiments will be carried out for three coals from the Argonne collection: (1) a high-volatile bituminous coal with high ash content (Illinois {number_sign}6), (2) a bituminous coal with low ash content ... continued below

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12 p.

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Zygourakis, K. December 31, 1994.

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Description

The project will quantify the effect of the following pyrolysis conditions on the macropore structure and on the subsequent reactivity of chars: (a) pyrolysis heating rate; (b) final heat treatment temperature (HTT); (c) duration of heat treatment at HTT (or soak time); (d) pyrolysis atmosphere (N{sub 2} or O{sub 2}/N{sub 2} mixtures); (e) coal particle size (100-1,000 {mu}m in diameter); (f) sulfur-capturing additives (limestone); and (g) coal rank. Pyrolysis experiments will be carried out for three coals from the Argonne collection: (1) a high-volatile bituminous coal with high ash content (Illinois {number_sign}6), (2) a bituminous coal with low ash content (Utah Blind Canyon) and (3) a lower rank subbituminous coal (Wyodak-Anderson seam). A mathematical model was developed to study the thermal ignition of char particles. The model assumes a bimodal pores size distribution with small micropores (of the order of a few {angstrom}) and large micropores in the {mu}m size range. All the model parameters can be estimated using data obtained previously in our laboratory. We are currently testing this model to determine its validity and to investigate how char properties (porosity, particle size, macropore surface area, micropore radius) and operating conditions (temperature, oxygen concentration, flow rate) affect ignition phenomena.

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12 p.

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OSTI as DE96010233

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  • Other Information: PBD: [1994]

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  • Other: DE96010233
  • Report No.: DOE/PC/91307--T17
  • Grant Number: FG22-91PC91307
  • DOI: 10.2172/227695 | External Link
  • Office of Scientific & Technical Information Report Number: 227695
  • Archival Resource Key: ark:/67531/metadc666650

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  • December 31, 1994

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 4, 2015, 10:56 p.m.

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Zygourakis, K. Coal combustion: Effect of process conditions on char reactivity. Quarterly technical report, July 1, 1994--September 30, 1994, report, December 31, 1994; United States. (digital.library.unt.edu/ark:/67531/metadc666650/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.