Analysis of coal devolatilization in a laboratory-scale entrained-flow reactor. Final report
The objective of this program is to develop the techniques to predict the pyrolysis behavior of a coal under conditions typical of entrained flow gasifiers. To achieve this objective, measurements of coal pyrolysis were made in a dilute-phase, lab-scale entrained-flow reactor which has the capacity for in-situ analysis by FT-IR. These data were used to modify and validate a general coal-pyrolysis theory under development at Advanced Fuel Research, Inc. The theory predicts pyrolysis product yields and compositions in detail, and provides a foundation for modeling phenomena such as ignition, swelling, char reactivity, methane yield and the formation and gasification of tar and soot. Six coals (Pittsburgh No. 8, two Illinois No. 6 and a Utah bituminous, a Wyoming subbituminous and a Montana lignite) were pyrolyzed at temperatures from 700/sup 0/C to 1200/sup 0/C for times from 6 to 660 milliseconds. Data were obtained for char and tar composition and gas yields as functions of reaction time and temperature. Material balances near 90% were obtained for the most recent tests. Results from the entrained flow reactor experiments indicate that FT-IR is an excellent way to measure gas evolution (including in-situ measurements of species and temperature) and functional group changes in the reactants. The measurements have yielded additional evidence that coal-pyrolysis kinetics are insensitive to coal rank. Good agreement between theory and experiment have been obtained using a set of distributed kinetic rate coefficients which fit experiments differing substantially in configuration, temperature, and reaction time. 69 figures, 8 tables.
- Research Organization:
- Advanced Fuel Research, Inc., East Hartford, CT (USA)
- OSTI ID:
- 5951864
- Report Number(s):
- EPRI-AP-2603; ON: DE83902950
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404 -- Coal
Lignite
& Peat-- Gasification
010406* -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
ALKANES
BENCH-SCALE EXPERIMENTS
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMICAL REACTORS
COAL
COAL RANK
COAL TAR
DATA
DECOMPOSITION
DEVOLATILIZATION
ENERGY SOURCES
ENTRAINMENT
EXPERIMENTAL DATA
FLUIDS
FOSSIL FUELS
FOURIER TRANSFORMATION
FUELS
GASES
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
KINETICS
LIGNITE
MATERIALS
METHANE
NUMERICAL DATA
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PYROLYSIS
PYROLYSIS PRODUCTS
PYROLYTIC GASES
REACTION KINETICS
SOOT
SPECTRA
SPECTROSCOPY
SUBBITUMINOUS COAL
SWELLING
TAR
THERMOCHEMICAL PROCESSES
TRANSFORMATIONS
VERY HIGH TEMPERATURE
YIELDS