Coal combustion: Effect of process conditions on char reactivity. Final technical report, September 1, 1991--May 31, 1995

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Description

Coal utilization involves two major stages: coal pyrolysis and char combustion. Figure 1.1 summarizes the steps of these processes. During the pyrolysis stage, heated particles from plastic coals soften, swell and release their volatiles before resolidifying again. During the combustion or gasification stage, char particles may ignite and fragment as the carbon is consumed leaving behind a solid ash residue. Process conditions such as pyrolysis heating rate, heat treatment temperature, pyrolysis atmosphere, and particle size are shown to chemically and physically affect the coal during pyrolysis and the resulting char. Consequently, these pyrolysis conditions as well as the combustion conditions ... continued below

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128 p.

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Zygourakis, K. February 1996.

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Description

Coal utilization involves two major stages: coal pyrolysis and char combustion. Figure 1.1 summarizes the steps of these processes. During the pyrolysis stage, heated particles from plastic coals soften, swell and release their volatiles before resolidifying again. During the combustion or gasification stage, char particles may ignite and fragment as the carbon is consumed leaving behind a solid ash residue. Process conditions such as pyrolysis heating rate, heat treatment temperature, pyrolysis atmosphere, and particle size are shown to chemically and physically affect the coal during pyrolysis and the resulting char. Consequently, these pyrolysis conditions as well as the combustion conditions such as the oxygen concentration and combustion temperature affect the char reactivity and ignition phenomena during the combustion stage. Better understanding of the fundamental mechanisms of coal pyrolysis and char combustion is needed to achieve greater and more efficient utilization of coal. Furthermore, this knowledge also contributes to the development of more accurate models that describe the transient processes involved in coal combustion. The project objectives were to investigate the effect of pyrolysis conditions on the macropore structure and subsequent reactivity of chars.

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128 p.

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OSTI as DE96005558

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  • Other Information: PBD: [1996]

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  • Other: DE96005558
  • Report No.: DOE/PC/91307--T16
  • Grant Number: FG22-91PC91307
  • DOI: 10.2172/196524 | External Link
  • Office of Scientific & Technical Information Report Number: 196524
  • Archival Resource Key: ark:/67531/metadc670922

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  • February 1996

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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. Final technical report, September 1, 1991--May 31, 1995, report, February 1996; United States. (digital.library.unt.edu/ark:/67531/metadc670922/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.