Combustion rates of coal chars: a review

Conference · Fri Jan 01 04:00:00 EST 1982 · Symp. (Int.) Combust., (Proc.); (United States)

OSTI ID:5542932

Smith, I W

A brief description is given of devolatilization of raw coal and combustion of the residual char. Major achievements in the study of devolatilization and important areas for further experimentation are noted; however, attention is focussed on the rate processes involved in char combustion. Means of calculating reaction rates are shown which account for temperatures of particles, mass transfer and diffusion of oxygen into the particle's pore structure, and reaction on the pore walls. Theoretical consideration is then given to the changes in the size, density, and pore structure of chars as they burn. Experimental data are shown for observed reactivities of coal chars corrected for external mass transfer effects, and intrinsic reactivities are reported for various coal chars and other carbons corrected for pore diffusion effects. Measured data on mass-transfer rates and changes in particle structure during combustion are given. Recommendations are made for further research on char reactivity and the manner in which pore structure develops during combustion. The need for combustion-oriented kinetics studies of coal devolatilization is outlined. 120 references, 18 figures.

• Research Organization: Commonwealth Scientific and Industrial Research Organization, North Ryde, Australia
• OSTI ID: 5542932
• Report Number(s): CONF-820801-
• Conference Information: Journal Name: Symp. (Int.) Combust., (Proc.); (United States)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
BIBLIOGRAPHIES
CARBON
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTION KINETICS
COAL
COMBUSTION KINETICS
DEVOLATILIZATION
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
KINETICS
MASS TRANSFER
MATERIALS
NONMETALS
PARTICLE SIZE
PARTICLES
POROSITY
PYROLYSIS PRODUCTS
REACTION KINETICS
REVIEWS
SIZE