Pyrolysis and gasification of coal at high temperatures
The systematic investigation on the effects of pyrolysis conditions and char macropore structure on char reactivity continued. During the past quarter, we concentrated our efforts on studying the reactivity of chars devolatilized in reactive atmospheres and under pyrolysis conditions encountered in mild gasification processes. Pyrolysis and gasification experiments were performed consecutively in our TGA/VMI reactor. After pyrolyzing the coal particles to a final heat treatment temperature of 500 {degree}C, the char reactivity patterns were measured at three temperatures (420, 450 and 500 {degree}C). The lower heat treatment temperatures employed for these experiments (500 {degree}C or close to mild gasification conditions) resulted in more reactive chars. We compared the reactivities of chars pyrolyzed in inert (N{sub 2}) and reactive (O{sub 2}/N{sub 2}) atmospheres in both the kinetic and the diffusion limited regime. Significant differences in the reactivity of these two groups of chars were found in the diffusion limited regime. Finally, we used the microscopy of our thermogravimetric reactor to monitor the structure transformations occurring during pyrolysis with oxygen. Pyrolysis experiments were videotaped and particle swelling, particle ignitions and fragmentation were determined and analyzed using digitized images from these experiments. 5 figs., 1 tab.
- Research Organization:
- Rice Univ., Houston, TX (USA). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- FG22-87PC79930
- OSTI ID:
- 6035255
- Report Number(s):
- DOE/PC/79930-T5; ON: DE91008957
- Country of Publication:
- United States
- Language:
- English
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Pyrolysis and gasification of coal at high temperatures. Quarterly progress report No. 11, March 15, 1990--June 15, 1990
Pyrolysis and gasification of coal at high temperatures
Related Subjects
BITUMINOUS COAL
PYROLYSIS
CHARS
CHEMICAL REACTION KINETICS
COAL GASIFICATION
COMBUSTION
FRAGMENTATION
IGNITION
MICROSCOPY
NITROGEN
OXYGEN
PARTICLES
POROSITY
PROGRESS REPORT
SWELLING
TEMPERATURE EFFECTS
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
DECOMPOSITION
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
KINETICS
MATERIALS
NONMETALS
OXIDATION
PYROLYSIS PRODUCTS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
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010409 - Coal
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