Pyrolysis and Physical Properties of Coal Blocks
- Oak Ridge National Laboratory (ORNL)
Interactions between the various physical properties of coal and its pyrolysis were characterized by studying the heating of 150-mm-diameter cylindrical blocks of Wilcox lignite, Wyodak subbituminous coal, Hanna bituminous coal, and Pittsburgh bituminous coal. (Some samples of coal overburden were also tested.) In the various coals, block pyrolysis caused gasification and cracking reactions and changes in char reactivity and in swelling, none of which is observed in powder pyrolysis. These changes were interpreted as having resulted from internal temperature gradients and flow patterns. To aid in an evaluation of this interpretation, physical and transport properties of coals were reviewed, measured, and correlated; new data on thermal diffusivity and conductivity of lignite of particular interest. This research was conducted in support of underground coal gasification (UCG) technology. Implications of the results for UCG are described, but the mechanisms and property data also have broader applications within the field of coal conversion.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 6433985
- Report Number(s):
- ORNL/TM-7313
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010406* -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
CORRELATIONS
CRACKS
DECOMPOSITION
DRYING
ENERGY SOURCES
ENERGY TRANSFER
ENTHALPY
FOSSIL FUELS
FUELS
GASIFICATION
HEAT TRANSFER
HEATING RATE
IN-SITU GASIFICATION
IN-SITU PROCESSING
MATERIALS
PHYSICAL PROPERTIES
PROCESSING
PYROLYSIS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
TEMPERATURE GRADIENTS
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TIME DEPENDENCE
YIELDS