Keywords
Oil Shale, Pyrolysis, Pressure, Char Morphology
Abstract
A better understanding of high-pressure coal pyrolysis is needed to design advanced coal gasification combined-cycle systems. High-temperature, high-heating-rate, and high-pressure pyrolysis experiments were conducted on three bituminous coals and a lignite, to more fully understand the effects of pressure on resultant char properties. A flat-flame burner was designed and used inside a high-pressure drop-tube reactor to provide a high-temperature, high-heatingrate environment that is representative of industrial processes. Chars were prepared at four different pressures, ranging from 0.85 atm to 15 atm. The measured total volatiles yields compared well with predictions of the Chemical Percolation Devolatilization (CPD) model. The physical properties of the char samples were analyzed, including swelling ratio, morphology, and internal surface areas. Chars produced at high pressure were determined to be in the early stage of foam structure evolution and have a higher porosity but denser skeleton. The internal surface areas of chars decreases as the pressure increases, which contributes mostly to the lower intrinsic reactivity of chars that are formed at high pressure.
Original Publication Citation
Zeng, D. and T. H. Fletcher, “The Effect of Pressure on Coal Pyrolysis and Char Morphology,” Energy and Fuels, 19, 1828-1838 (2005).
BYU ScholarsArchive Citation
Zeng, Dong and Fletcher, Thomas H., "Effects of Pressure on Coal Pyrolysis and Char Morphology" (2005). Faculty Publications. 7033.
https://scholarsarchive.byu.edu/facpub/7033
Document Type
Peer-Reviewed Article
Publication Date
2005
Publisher
American Chemical Society
Language
English
College
Ira A. Fulton College of Engineering
Department
Chemical Engineering
Copyright Status
© 2005 American Chemical Society
Copyright Use Information
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