- Author
- Niksa, S. | Heyd, L. E. | Russel, W. B. | Saville, D. A.
- Title
- On the Role of Heating Rate in Rapid Coal Devolatilization.
- Coporate
- Sandia Labs., Livermore, CA Princeton Univ., NJ
- Report
- WSS/CI 84-22, 1984, 19 p.
- Book or Conf
- Combustion Institute/Western States Section. Spring Meeting, 1984. April 2-3, 1984, Boulder, CO., 1984
- Keywords
- weight loss | kinetics | reaction models
- Abstract
- We have measured time-resolved weight loss from two bituminous coals during heatup at heating rates approaching pulverized fuel firing conditions; the heating rate varied from 10(2) to 10(4) K/s independently of reaction temperatures (to 1300 K). The results indicate that both ultimate yields and evolution rates increase with faster heating, particularly for condensed liquid products. Increasing the pressure from vacuum to 0.19 MPa diminished the sensitivity to heating rate and suppressed the reactive volatiles. A non-isothermal kinetic analysis of a single reaction model describes yield suppression during heatup and predicts the faster generation rates with faster heating. When coupled into a competitive rate scheme, this model could account for the enhanced yields.