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An experimental study of the effect of water content on combustion of coal tar/water emulsion droplets

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  • Deng, Shengxiang
  • Zhou, Jiemin

Abstract

Isolated high asphaltene droplets of coal tar/water emulsion were studied to investigate the non-steady behavior of the burning droplets. Data on size and temperature histories were obtained. Coke residues were analyzed by scanning electron microscope. Lower and upper limits for ignition time delay were established. The error, defined as the time lag between these two limits, was less than 8 ms. Ignition time delays of emulsions were longer than for ordinary coal tar (CT) droplets of the same size but the peak temperature of emulsions occurred much earlier. A steeper temperature rise observed in the emulsions during portions of their combustion history is evidence not only of soot reduction but also the extent of burnout of the cenospheres. The latter is an important aspect in the reduction of pollutant emissions. The emulsion droplets indicated swelling of considerable magnitude compared with that of CT. Coke particles formed from emulsions were more porous, with thinner and fragile shells. The CT residues were harder and more resistant to burning. Excess burnout time or the ratio of burnout time of the emulsions depended on the water concentration, indicating that longer oxidation time was required for coke particles from coal tar than from emulsions.

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  • Deng, Shengxiang & Zhou, Jiemin, 2011. "An experimental study of the effect of water content on combustion of coal tar/water emulsion droplets," Energy, Elsevier, vol. 36(10), pages 6130-6137.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:10:p:6130-6137
    DOI: 10.1016/j.energy.2011.07.052
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    References listed on IDEAS

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    Cited by:

    1. Chen, Xiaohui & Zheng, Danxing & Guo, Jing & Liu, Jingxiao & Ji, Peijun, 2013. "Energy analysis for low-rank coal based process system to co-produce semicoke, syngas and light oil," Energy, Elsevier, vol. 52(C), pages 279-288.
    2. Won, Jonghan & Baek, Seung Wook & Kim, Hyemin, 2018. "Autoignition and combustion behavior of emulsion droplet under elevated temperature and pressure conditions," Energy, Elsevier, vol. 163(C), pages 800-810.
    3. Wamankar, Arun Kumar & Murugan, S., 2015. "Review on production, characterisation and utilisation of solid fuels in diesel engines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 249-262.
    4. Strizhak, Pavel A. & Vershinina, Ksenia Yu., 2017. "Maximum combustion temperature for coal-water slurry containing petrochemicals," Energy, Elsevier, vol. 120(C), pages 34-46.

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