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Ignition behavior of single coal particle in a fluidized bed under O2/CO2 and O2/N2 atmospheres: A combination of visual image and particle temperature

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  • Bu, Changsheng
  • Liu, Daoyin
  • Chen, Xiaoping
  • Pallarès, David
  • Gómez-Barea, Alberto

Abstract

Single coal particle ignition behavior was studied in a two-dimensional (200mm×20mm×400mm) fluidized bed under O2/N2 and O2/CO2 atmosphere with O2 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 6–13mm, 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 O2/CO2 atmosphere the ignition delay time is much longer than in O2/N2 atmosphere. The devolatilization process is controlled by internal and external heat transfer but it is almost unaffected by atmosphere at the same O2 concentration. The effect of volatile combustion on heating and extinction delay time can be neglected for larger coal particles.

Suggested Citation

  • Bu, Changsheng & Liu, Daoyin & Chen, Xiaoping & Pallarès, David & Gómez-Barea, Alberto, 2014. "Ignition behavior of single coal particle in a fluidized bed under O2/CO2 and O2/N2 atmospheres: A combination of visual image and particle temperature," Applied Energy, Elsevier, vol. 115(C), pages 301-308.
    • Handle: RePEc:eee:appene:v:115:y:2014:i:c:p:301-308
    DOI: 10.1016/j.apenergy.2013.10.040
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    References listed on IDEAS

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    1. Wang, Chang’an & Zhang, Xiaoming & Liu, Yinhe & Che, Defu, 2012. "Pyrolysis and combustion characteristics of coals in oxyfuel combustion," Applied Energy, Elsevier, vol. 97(C), pages 264-273.
    2. Tan, Y. & Jia, L. & Wu, Y. & Anthony, E.J., 2012. "Experiences and results on a 0.8MWth oxy-fuel operation pilot-scale circulating fluidized bed," Applied Energy, Elsevier, vol. 92(C), pages 343-347.
    3. Bolea, Irene & Romeo, Luis M. & Pallarés, David, 2012. "The role of external heat exchangers in oxy-fuel circulating fluidized bed," Applied Energy, Elsevier, vol. 94(C), pages 215-223.
    4. Wu, Yinghai & Wang, Chunbo & Tan, Yewen & Jia, Lufei & Anthony, Edward J., 2011. "Characterization of ashes from a 100kWth pilot-scale circulating fluidized bed with oxy-fuel combustion," Applied Energy, Elsevier, vol. 88(9), pages 2940-2948.
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    2. Song, Yawei & Su, Sheng & Liu, Yushuai & Zhao, Zheng & Xu, Kai & Xu, Jun & Jiang, Long & Wang, Yi & Hu, Song & Xiang, Jun, 2024. "Characteristics of OH formation during single coal particle ignition and volatile combustion in O2/N2 and O2/CO2 atmospheres," Energy, Elsevier, vol. 288(C).
    3. Salmasi, A. & Shams, M. & Chernoray, V., 2018. "An experimental approach to thermochemical conversion of a fuel particle in a fluidized bed," Applied Energy, Elsevier, vol. 228(C), pages 524-534.
    4. Li, Shiyuan & Li, Haoyu & Li, Wei & Xu, Mingxin & Eddings, Eric G. & Ren, Qiangqiang & Lu, Qinggang, 2017. "Coal combustion emission and ash formation characteristics at high oxygen concentration in a 1MWth pilot-scale oxy-fuel circulating fluidized bed," Applied Energy, Elsevier, vol. 197(C), pages 203-211.
    5. Singh, Ravi Inder & Kumar, Rajesh, 2016. "Current status and experimental investigation of oxy-fired fluidized bed," Renewable and Sustainable Energy Reviews, Elsevier, vol. 61(C), pages 398-420.
    6. Chen, Jia & Fang, Dongdong & Duan, Feng, 2018. "Pore characteristics and fractal properties of biochar obtained from the pyrolysis of coarse wood in a fluidized-bed reactor," Applied Energy, Elsevier, vol. 218(C), pages 54-65.
    7. Yi, Baojun & Zhang, Liqi & Huang, Fang & Mao, Zhihui & Zheng, Chuguang, 2014. "Effect of H2O on the combustion characteristics of pulverized coal in O2/CO2 atmosphere," Applied Energy, Elsevier, vol. 132(C), pages 349-357.
    8. Lu, Hantao & Gong, Yan & Guo, Qinghua & Wang, Yue & Song, Xudong & Yu, Guangsuo, 2024. "In-situ study on flow and rotation behaviors of coal particles near the burner plane in an impinging entrained-flow gasifier," Applied Energy, Elsevier, vol. 359(C).
    9. Liu, Xiang & Chen, Meiqian & Wei, Yuanhang, 2016. "Assessment on oxygen enriched air co-combustion performance of biomass/bituminous coal," Renewable Energy, Elsevier, vol. 92(C), pages 428-436.
    10. Salinero, J. & Gómez-Barea, A. & Fuentes-Cano, D. & Leckner, B., 2018. "The influence of CO2 gas concentration on the char temperature and conversion during oxy-fuel combustion in a fluidized bed," Applied Energy, Elsevier, vol. 215(C), pages 116-130.
    11. Song, Yawei & Su, Sheng & Chen, Yifeng & Liu, Yushuai & Zhao, Zheng & Wang, Jingyan & Ren, Qiangqiang & Han, Hengda & Xu, Kai & Xu, Jun & Jiang, Long & Wang, Yi & Hu, Song & Xiang, Jun, 2023. "Effects of moisture on soot generation and ignition of coal particle: Investigation and evaluation with OH-planar laser induced fluorescence," Energy, Elsevier, vol. 278(PA).

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