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Combustion of a coal char particle in a stream of dry gas
- Source :
- Combustion and Flame, ISSN 0010-2180, 2008-01, Vol. 152, No. 1-2, Archivo Digital UPM, instname
- Publication Year :
- 2008
- Publisher :
- E.T.S.I. Aeronáuticos (UPM), 2008.
-
Abstract
- The burning rate, surface temperature, drag, and extinction conditions of a single char particle moving in a gas are computed numerically. The effects of the size and velocity of the particle and of the temperature and composition of the gas are examined in the framework of a simple model that includes O2 and CO2 heterogeneous reactions and, in some cases, a diffusion-controlled CO oxidation flame in the gas around the particle. In agreement with known results, the burning rate is found to increase with the velocity of the particle when the Reynolds number of the gas flow ceases to be small. The temperature of the particle increases with the temperature and oxygen mass fraction of the gas and is little affected by the size and velocity of the particle, except in the vicinity of extinction. The drag coefficient is a decreasing function of the particle size and velocity in the range of Reynolds numbers that has been analyzed. The presence of CO2 in the gas may have an important effect on the gasification of small particles.
- Subjects :
- Range (particle radiation)
Drag coefficient
Chemistry
020209 energy
General Chemical Engineering
Diffusion flame
General Physics and Astronomy
Energy Engineering and Power Technology
Mineralogy
02 engineering and technology
General Chemistry
Mechanics
Combustion
Aeronáutica
Fuel Technology
020401 chemical engineering
13. Climate action
Drag
0202 electrical engineering, electronic engineering, information engineering
Particle
Char
Particle size
0204 chemical engineering
Subjects
Details
- Language :
- Spanish; Castilian
- Database :
- OpenAIRE
- Journal :
- Combustion and Flame, ISSN 0010-2180, 2008-01, Vol. 152, No. 1-2, Archivo Digital UPM, instname
- Accession number :
- edsair.doi.dedup.....4860f7b7c17b6cd5743dee968fb43839