Mathematical modeling of pulverized coal combustion in axisymmetric geometries
- Babcock and Wilcox, Alliance, OH (United States). Research and Development Div.
Pulverized coal combustion is studied in non-swirling and swirling flames. The various interacting processes which occur during combustion are modeled: turbulent flow, heterogeneous and homogeneous chemical reaction, and heat transfer. Gas phase reactions are based on a two step method with an initial fast step producing a pool of carbon monoxide and products and a final step in which the carbon monoxide is kinetically oxidized, based on the relative turbulence and kinetic time scales. Modeled heterogeneous reactions include evaporation, devolatilization, and char oxidation. Particle dispersion is simulated using a stochastic model. Gas- and particle-phase energy equations are used to determine gas and particle temperatures. Radiation heat transfer in the participating media is modeled by the discrete originates method. Numerical predictions are compared to experimental data for three cases of increasing geometric complexity. Cases include non-swirling and particle-laden flow in a 1/6-scale utility burner. Predictions have been useful in understanding combustion processes and guiding future research to meet long term objectives of using the models as design tools.
- OSTI ID:
- 72850
- Report Number(s):
- CONF-941007--
- Country of Publication:
- United States
- Language:
- English
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