A mechanistic study of coal pyrolysis with modified coals
The reactions occurring during coal pyrolysis are complex. Experimental results have been shown to be sensitive not only to the experimental conditions but also to the nature of the equipment and the character of the coal. The influences of changes in pressure, heating rate, and particle size have been particularly difficult to unravel. To illustrate, as the pressure is increased, the yields of char and light hydrocarbons, especially methane, increase. The most reasonable interpretation postulates that the rate at which primary tar products diffuse out of the reacting coal particle decreases as the pressure is increased. At higher pressures, the primary tar products are less volatile and their increased residence time in the medium allows for further secondary reactions which converts these substances to light hydrocarbons and char. The investigations of product distributions and their temperature dependence have provided basic information for the development of reaction models. 11 refs., 3 figs., 3 tabs.
- Research Organization:
- Institute of Gas Technology, Chicago, IL (USA)
- OSTI ID:
- 7176532
- Report Number(s):
- CONF-870323-7; ON: DE88017154
- Country of Publication:
- United States
- Language:
- English
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& Peat-- Pyrolysis & Carbonization-- (1987-)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ALKYLATION
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMICAL REACTORS
COAL
COMBUSTION KINETICS
COMBUSTION PRODUCTS
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
KINETICS
MATERIALS
ORGANIC COMPOUNDS
PYROLYSIS
REACTION KINETICS
SAMPLE PREPARATION
THERMOCHEMICAL PROCESSES