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Ignition behavior of single coal particle in a fluidized bed under O-2/CO2 and O-2/N-2 atmospheres: A combination of visual image and particle temperature

C. S. Bu ; D. Y. Liu ; X. P. Chen ; David Pallares (Institutionen för energi och miljö, Energiteknik) ; A. Gomez-Barea
Applied Energy (0306-2619). Vol. 115 (2014), p. 301-308.
[Artikel, refereegranskad vetenskaplig]

Single coal particle ignition behavior was studied in a two-dimensional (200 mm x 20 mm x 400 mm) fluidized bed under O-2/N-2 and O-2/CO2 atmosphere with O-2 volume concentration in the range of 0-40%, by a combination of visual observation of the volatile flame and measurement of the particle center temperature. A piece of transparent quartz glass was used as the front wall of the fluidized bed to allow visual observation. The investigated fuel particles were spherical sub-bituminous coal particles with diameter in a range of 6-13 mm, which were artificially carved from selected original coal particles. The volatile combustion flame was recorded by a color video camera to analyze its ignition time delay and extinction behavior. The temperature in the particle center was measured by a very thin thermocouple to follow the particle heating process. Results indicate that under O-2/CO2 atmosphere the ignition delay time is much longer than in O-2/N-2 atmosphere. The devolatilization process is controlled by internal and external heat transfer but it is almost unaffected by atmosphere at the same O-2 concentration. The effect of volatile combustion on heating and extinction delay time can be neglected for larger coal particles.

Nyckelord: Oxyfuel, O-2/CO2 atmosphere, Fluidized bed, Devolatilization, Ignition, OXY-FUEL COMBUSTION, HYDROGEN-PRODUCTION SYSTEMS, PULVERIZED COAL, CO2, CAPTURE, DIFFERENT RANKS, CHAR PARTICLES, DEVOLATILIZATION, GASIFICATION, PYROLYSIS, ELECTRICITY



Denna post skapades 2014-03-17.
CPL Pubid: 195119

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik (2005-2017)

Ämnesområden

Energiteknik

Chalmers infrastruktur