MECHANISMS AND OPTIMIZATION OF COAL COMBUSTION
The completed research project has made some significant contributions that will help us meet the challenges outlined in the previous section. One of the major novelties of our experimental approach involves the application of video microscopy and digital image analysis to study important transient phenomena (like particle swelling and ignitions) occurring during coal pyrolysis and combustion. Image analysis was also used to analyze the macropore structure of chars, a dominant factor in determining char reactivity and ignition behavior at high temperatures where all the commercial processes operate. By combining advanced experimental techniques with mathematical modeling, we were able to achieve the main objectives of our project. More specifically: (1) We accurately quantified the effect of several important process conditions (like pyrolysis heating rate, particle size, heat treatment temperature and soak time) on the combustion behavior of chars. These measurements shed new light into the fundamental mechanisms of important transient processes like particle swelling and ignitions. (2) We developed and tested theoretical models that can predict the ignition behavior of char particles and their burn-off times at high temperatures where intraparticle diffusional limitations are very important.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- FG22-96PC96214
- OSTI ID:
- 789667
- Report Number(s):
- FG22-96PC96214-07; TRN: US200201%%492
- Resource Relation:
- Other Information: PBD: 31 Oct 2000
- Country of Publication:
- United States
- Language:
- English
Similar Records
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