## Abstract The physical and chemical characteristics that influence the conversion of fuel nitrogen to nitrogen oxides during coal char combustion were theoretically examined by using a simplified model in which nitric oxide is an intermediate product between fuel nitrogen and N~2~. It was found
On the identification of reaction regimes for the combustion of coal chars
โ Scribed by M.C. Gutierrez; A.L. Cukierman; N.O. Lemcoff
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 236 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0016-2361
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๐ SIMILAR VOLUMES
time is the same as that corresponding to pore diffusion control (Equation ( )). If the evolution of surface area can be described by: S/S,=(l-f)"3 (6) the resulting equation for the conversion coincides with that for film-diffusion control (Equation ( )). Therefore, it is concluded that much care
Combustion rate measurements of Loy Yang brown coal char particles (88 #m median size) over the temperature range 940-1420 K yielded a chemical rate coefficient Re, expressed as Re= 12.6 expl-68.3/(RTp)] kg/m2s (kPa 02) ยฐ.4. Particle size and density decreased with burn off, but in an unusual manne
To simulate combustion behaviour in a pilot-scale combustor, a laboratory-scale agitated combustor has been developed which allows burnout and combustion rates for large coal particles to be measured. Particle sizes up to 25 mm can be studied, typical of those used in fixed-bed retorts. Char burnout
The rate of oxidation and surface temperature of a char particle during combustion is determined by the combined action of reactions of carbon with oxygen and CO2 at the surface and carbon monoxide with O2 in the gas phase. Limiting values for the rates and temperature were determined by Amundson el