Impact of heat and mass transfer on combustion of a fuel particle in CFB boilers
- Academy of Sciences of Belarus, Minsk (Belarus). A.V. Luikov Heat and Mass Transfer Inst.
- Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Energy Conversion
High excess temperatures of burning coal particles, up to 600 K, have been measured with a two-color pyrometer in the transport zone of a CFB boiler at a rather low average oxygen concentration of about 6%. To understand this phenomenon, a model of heat and mass transfer between a burning char particle and its surrounding has been developed, based on measured heat transfer coefficients and the estimated slip velocity of a char particle. The gas-convective and radiative mechanisms of heat transfer were found to dominate in the core of the transport zone of a CFB furnace. The gas-convective transfer rate was 1.5 times as high as in a single-phase flow. Model calculations show that particles between 0.3 and 3 mm could have as high a temperature as the measured ones, provided that there is a highly non-uniform oxygen distribution over the furnace cross-section.
- OSTI ID:
- 357867
- Report Number(s):
- CONF-9705116-; ISBN 0-7918-1557-9; TRN: IM9932%%212
- Resource Relation:
- Conference: 14. international conference on fluidized bed combustion, Vancouver (Canada), 11-16 May 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the 14. international conference on fluidized bed combustion: Volume 2; Preto, F.D.S. [ed.] [Canada Centre for Mineral and Energy Technology, Ottawa, Ontario (Canada). Energy Technology Centre]; PB: 647 p.
- Country of Publication:
- United States
- Language:
- English
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