Pyrolysis and gasification of coal at high temperatures. Quarterly progress report No. 10, December 15, 1989--March 15, 1990
We made considerable progress towards developing a thermogravimetric reactor with in-situ video imaging capability (TGA/IVIM). Such a reactor will allow us to observe macroscopic changes in the morphology of pyrolyzing particles and thermal ignitions while monitoring at the time the weight of pyrolyzing or reacting samples. The systematic investigation on the effects of pyrolysis conditions and char macropore structure on char reactivity continued. Pyrolysis and gasification experiments were performed consecutively in our TGA reactor and the char reactivity patterns were measured for a wide range of temperatures (400 to 600{degrees}C). These conditions cover both the kinetic and the diffusion limited regimes. Our results show conclusively that chars produced at high pyrolysis heating rates (and, therefore, having a more open cellular macropore structure) are more reactive and ignite more easily than chars pyrolyzed at low heating rates. These results have been explained using available predictions from theoretical models. We also investigated for the first time the effect of coal particle size and external mass transfer limitations on the reactivity patterns and ignition behavior of char particles combusted in air. Finally, we used our hot stage reactor to monitor the structural transformations occurring during pyrolysis via a video microscopy system. Pyrolysis experiments were videotaped and particle swelling and the particle ignitions were determined and analyzed using digitized images from these experiments.
- Research Organization:
- Rice Univ., Houston, TX (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-87PC79930
- OSTI ID:
- 10123082
- Report Number(s):
- DOE/PC/79930-T16; ON: DE93007682
- Resource Relation:
- Other Information: PBD: [1990]
- 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
COAL
PYROLYSIS
CHARS
POROSITY
GASIFICATION
PROGRESS REPORT
COAL GASIFICATION
MICROSCOPY
THERMAL GRAVIMETRIC ANALYSIS
CHEMICAL REACTION KINETICS
TEMPERATURE DEPENDENCE
HEATING RATE
IGNITION
MATHEMATICAL MODELS
PARTICLE SIZE
SWELLING
010404
010409
PYROLYSIS AND CARBONIZATION