Evolution and yield of products from coals under rapid pyrolysis conditions

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6231754

Leff, A A

This study was designed to determine the effects of temperature and particle size on coal pyrolysis. Seven coals were studied. Coal samples with a geometric mean particle size of 40 ..mu..m were pyrolyzed at 673 K, 873 K and 1073 K. Three coals had additional samples prepared with geometric mean particle sizes of 193 ..mu..m and 545 ..mu..m. These coals were pyrolyzed at 873 K. The rank of the coals covered the range of subbituminous B to semi-anthracite. An apparatus was designed to provide rapid heating of small aliquots of the prepared samples. Heating rates of particle's surface were calculated to be greater than 1000 K/sec. Sample weight changes were determined using an ash tracer technique. The evolution of methane, ethane and carbon dioxide was monitored with a mass spectrometer. The mass spectrometer was computerized to provide rapid data acquisition. The evolution in time and yield of the products were recorded. Coal pyrolysis may be chemically or physically controlled. The controlling pyrolysis mechanism is a function of final temperature, particle size and the chemical and structural nature of the particular coal.

• OSTI ID: 6231754
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010406* -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
ALKANES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COAL
COAL RANK
DATA
DECOMPOSITION
ENERGY SOURCES
ETHANE
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
HEATING RATE
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
KINETICS
MASS SPECTRA
MATERIALS
METHANE
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PYROLYSIS
REACTION KINETICS
SIZE
SPECTRA
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
VERY HIGH TEMPERATURE
YIELDS