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Influence of particle sizes on combustion characteristics of coal particles in oxygen-deficient atmosphere

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  • Cong, Kunlin
  • Zhang, Yanguo
  • Han, Feng
  • Li, Qinghai

Abstract

The combustion characteristics of coal samples with different particle size were investigated using a thermogravimetric analyzer. Three different heating rates were set in the oxygen-deficient atmosphere of 12 vol % oxygen concentration. Experiments were conducted on four particle sizes with a diameter of 0.6, 1.0, 2.0, and 4.0 mm. It was found that ignition and burnout temperatures of coals rose approximately linearly with the increasing particle size. The ignition temperature of the coal with a diameter of 4.0 mm (482 °C–520 °C) varied greatly at different heating rates compared with that of 0.6 mm (473 °C–481 °C). The effect of particle size on the ignition temperature decreased with the increase in heating rate, while the effect on the burnout temperature was promoted. The calculation of the combustion index and the results of the kinetic analysis indicated that the reactivity decreased as the coal particle size increased. The results of this paper can provide guidelines for the development of a staged fuel-feeding horizontal circulating fluidized bed boiler.

Suggested Citation

  • Cong, Kunlin & Zhang, Yanguo & Han, Feng & Li, Qinghai, 2019. "Influence of particle sizes on combustion characteristics of coal particles in oxygen-deficient atmosphere," Energy, Elsevier, vol. 170(C), pages 840-848.
    • Handle: RePEc:eee:energy:v:170:y:2019:i:c:p:840-848
    DOI: 10.1016/j.energy.2018.12.216
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    1. Song, Jiajia & Deng, Jun & Zhao, Jingyu & Zhang, Yanni & Wang, Caiping & Shu, Chi-Min, 2021. "Critical particle size analysis of gas emission under high-temperature oxidation of weathered coal," Energy, Elsevier, vol. 214(C).
    2. Nematollahi, Maryam & Sadeghi, Sadegh & Rasam, Hamed & Bidabadi, Mehdi, 2020. "Analytical modelling of counter-flow non-premixed combustion of coal particles under non-adiabatic conditions taking into account trajectory of particles," Energy, Elsevier, vol. 192(C).
    3. Gao, Mingqiang & Cheng, Cheng & Miao, Zhenyong & Wan, Keji & He, Qiongqiong, 2023. "Physicochemical properties, combustion kinetics and thermodynamics of oxidized lignite," Energy, Elsevier, vol. 268(C).
    4. Zhao, Jingyu & Zhang, Yongli & Song, Jiajia & Guo, Tao & Deng, Jun & Shu, Chi-Min, 2023. "Oxygen distribution and gaseous products change of coal fire based upon the semi-enclosed experimental system," Energy, Elsevier, vol. 263(PB).
    5. Zhong, Shan & Yue, Hairong & Baitalow, Felix & Reinmöller, Markus & Meyer, Bernd, 2021. "In-situ investigation of coal particle fragmentation induced by thermal stress and numerical analysis of the main influencing factors," Energy, Elsevier, vol. 215(PA).

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