Macroscopic sample effects on the pyrolysis of bituminous and subbituminous coals at underground coal gasification heating rates

Conference · Sat Jan 01 04:00:00 EST 1977

OSTI ID:7219387

Forrester, III, R. C.

Two-dimensional pyrolysis behavior of 14- to 16-cm instrumented blocks of bituminous and subbituminous coals is being examined in support of in situ coal gasification process development. Results were obtained at conditions expected to occur underground. Experiments utilizing maximum reactor temperatures of 500 to 1000/sup 0/C over periods of 4 to 60 h produced data correlating tar and gas production rates and composition with maximum temperature and heating rate. Chars produced by some experiments have exhibited marked pyrophoricity. Furthermore, thermal profiles within the blocks during pyrolysis indicate clearly that volatilization of water is the heat transfer rate-limiting mechanism. Gas production from as-received specimens is observed to be significantly greater than that measured during the pyrolysis of powdered coal at similar heating rates. Diffusion of steam from a shrinking core of wet coal is postulated to account for this phenomenon. 11 figures.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: USDOE Office of Fossil Energy (FE)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 7219387
• Report Number(s): CONF-770652--10
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
COAL TAR
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
IN-SITU GASIFICATION
IN-SITU PROCESSING
KINETICS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PROCESSING
PYROLYSIS
REACTION KINETICS
STEAM
SUBBITUMINOUS COAL
TAR
THERMOCHEMICAL PROCESSES