- Author
-
Sibulkin, M.
- Title
- Heat of Gasification for Pyrolysis of Charring Materials.
- Coporate
- Brown Univ., Providence, RI
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
- Contract
- NBS-GRANT-NB83NADA4017
- Book or Conf
- International Association for Fire Safety Science. Fire Safety Science. Proceedings. 1st International Symposium. October 7-11, 1985,
Hemisphere Publishing Corp., NY,
Gaithersburg, MD,
Grant, C. E.; Pagni, P. J., Editors,
391-400 p.,
1986
- Keywords
-
cellulose
|
gasification
|
char
|
pyrolysis
|
thermal conductivity
- Abstract
- The relationships between the heats of reaction, pyrolysis and gasification are examined for vaporizing and charring materials. Solutions for pyrolysis of cellulose are obtained using a one dimensional, numerical model with material properties estimated from the literature. For this material it is found that after an initial transient hg is about twice hp. For a semi-infinite slab the value of hg then remains nearly constant; for a finite slab the value of hg may decrease with time to values less than hp. Changes in the assumed chemical reaction rate are found to have a minor effect on hg. The heat of gasification is also relatively insensitive to changes in the char density and thermal conductivity. The variation of hg with time is nearly independent of the assumed heat of reaction, but the magnitude of hg varies almost directly with the value of the heat of reaction. Changes in the incident heat flux give corresponding changes in the gasification rate, but much smaller changes in the heat of gasification.