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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
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- Bu, C. S. (author)
- Southeast University
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- Liu, D. Y. (author)
- Southeast University
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- Chen, X. P. (author)
- Southeast University
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- (creator_code:org_t)
- Elsevier BV, 2014
- 2014
- English.
- In: Applied Energy. - : Elsevier BV. - 1872-9118 .- 0306-2619. ; 115, s. 301-308
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
Keyword
- CAPTURE
- OXY-FUEL COMBUSTION
- PULVERIZED COAL
- DIFFERENT RANKS
- Ignition
- Oxyfuel
- PYROLYSIS
- Devolatilization
- CO2
- Fluidized bed
- GASIFICATION
- O-2/CO2 atmosphere
- ELECTRICITY
- CHAR PARTICLES
- HYDROGEN-PRODUCTION SYSTEMS
- DEVOLATILIZATION
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- ref (subject category)
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- Bu, C. S.
- Liu, D. Y.
- Chen, X. P.
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- Gomez-Barea, A.
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- ENGINEERING AND TECHNOLOGY
- ENGINEERING AND ...
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- Applied Energy
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- Chalmers University of Technology
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