Abstract
Dust flames are associated with two-phase combustion phenomena where flame characteristics depend on interactions between solid and gas phases. Since organic dust particles can be effectively utilized in energy production systems, investigation of this phenomenon is essential. In this study, an analytical model is presented to simulate the combustion process of moist organic dust. The flame structure is divided into three zones: preheat zone, reaction zone, and postflame zone. To determine the effects of moisture content and volatile evaporation, the preheat zone is also divided into four subzones: first heating subzone and drying subzone, second heating subzone, and volatile evaporation subzone. The results obtained from the presented model are in reasonable agreement with experimental data for lycopodium particles. An increase in moisture content causes a reduction in burning velocity owing to moisture evaporation resistance. Consequently, the effects of some important parameters, like volatilization temperature, volatilization Damköhler number and drying Damköhler number are investigated. In special cases, like high moisture content, low volatilization temperature, and high drying resistance, the second heating subzone is omitted.
Highlights
Increasing energy demands and the depletion of fossil fuels have caused humans to explore new resources to satisfy their energy needs
An analytical model was presented to determine the effects of moisture content on flame characteristics and to investigate the effective parameters for organic dust combustion
The flame structure is divided into three zones: preheat zone, reaction zone, and postflame zone
Summary
Increasing energy demands and the depletion of fossil fuels have caused humans to explore new resources to satisfy their energy needs. Effective conversion systems have an essential role to play in the future. M. Bidabadi School of Mechanical Engineering Department of Energy Conversion, Combustion Research Laboratory, Iran University of Science and Technology, Narmak, 16887 Tehran, Iran H. Beidaghy Dizaji School of Mechanical Engineering, Department of Aerospace Engineering, Iran University of Science and Technology, 16887 Tehran, Iran F. Faraji Dizaji School of Engineering, The University of Vermont, 33 Colchecter Avenue, Burlington, VT 05405, USA
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