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Ignition and combustion behavior of spent shale particles

Conference · · Symp. (Int.) Combust., (Proc.); (United States)
OSTI ID:5727949
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This study examines the ignition and burning of chars left after pyrolysis of 5-cm dia. oil shale samples. The experiments modeled in-situ retorting by minimizing radiation. The effects of shale grade (from 83 to 183 liter/tonne), retorting temperature (600 to 756 K), and combustion gas composition (5 to 21% O/sub 2/) were examined. This study confirms the important role of gasification of the char by CO/sub 2/ released from decomposition of carbonate minerals and explores the transition to that mechanism from the initial direct attach of O/sub 2/ on char. This transition is normally encountered in combustion of chars produced from rich shales. The role of CO combustion within the rock matrix is also considered. The model is presented which successfully predicts the temperature histories and conversions of the spent shales, as well as the change from the direct oxidation mechanism to the gasification mechanism described above.
Research Organization:
Carnegie-Mellon Univ., Pittsburgh, PA
OSTI ID:
5727949
Report Number(s):
CONF-820801-
Conference Information:
Journal Name: Symp. (Int.) Combust., (Proc.); (United States)
Country of Publication:
United States
Language:
English

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Related Subjects

04 OIL SHALES AND TAR SANDS
040401 -- Oil Shales & Tar Sands-- In Situ Methods
True & Modified
040900* -- Oil Shales & Tar Sands-- Waste management
BITUMINOUS MATERIALS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COMBUSTION
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
IN-SITU PROCESSING
IN-SITU RETORTING
MATERIALS
OIL SHALES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PROCESSING
PYROLYSIS
PYROLYSIS PRODUCTS
RETORTING
SPENT SHALES
THERMOCHEMICAL PROCESSES