Pyrolysis and gasification of coal at high temperatures. Quarterly progress report No. 2, December 15, 1987--March 15, 1988
The effects of particle size on the macropore structure of chars produced from an Illinois No. 6 coal were investigated. Three size fractions (100--120, 50--60 and 25--28 mesh) of coal particles were pyrolyzed in our captive-sample reactor at 10{degrees}C/s. By analyzing digitized particle cross-sections, we obtained the macropore volume distributions and surface areas, and determined that all three char samples had almost equal macroporosities. we have also analyzed for the first time the shape or boundary tortuosity of the macropores. As the size of the pyrolyzed coal particles increased, the produced chars exhibited macropores with more tortuous boundaries. Tortuous pore boundaries result in higher values for the true macropore surface areas and should enhance the reactivity of the char samples. A systematic procedure was developed for analyzing and averaging the simulation results obtained with our erosion models. Such a procedure is necessary for comparing statistical model predictions to experimental data. Several simulations were carried out to investigate the gasification behavior of the three char samples mentioned above and the predicted reactivity patterns are presented. Finally, a thermogravimetric analyzer (TGS-2) was ordered and will soon be delivered to our laboratory.
- 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:
- 10123752
- Report Number(s):
- DOE/PC/79930--T14; ON: DE93007680
- Country of Publication:
- United States
- Language:
- English
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