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Effective diffusivity of oxygen in the ash layer of Huadian oil shale semicoke

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Abstract

Diffusion of oxygen in the ash layer usually dominated the combustion of oil shale semicoke particles due to the high ash content. Thus, effective diffusivity of oxygen in the ash layer was a crucial parameter worthy of careful investigation. In this paper, the effective diffusivity of oxygen in the ash layer of Huadian oil shale semicoke was measured directly using an improved Wicke-Kallenbach diffusion apparatus. The experimental results showed that higher temperature would lead to a higher effective diffusivity and a thicker ash layer had the negative effect. Especially, the effective diffusivity along the direction perpendicular to bedding planes was much lower than that along the direction parallel to bedding planes. In addition, an effective diffusivity model was developed, which could be used to describe the mass transfer of oxygen in the ash layer of oil shale semicoke.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. U1810126).

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Authors and Affiliations

  1. Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China

    Yiqun Huang, Yiran Li, Man Zhang, Boyu Deng, Hao Kong, Junfu Lyu & Hairui Yang

  2. State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin Boiler Co., Ltd., Harbin, 150046, China

    Junfeng Wang

  3. Department of Automation, Shanxi University, Taiyuan, 030006, China

    Lingmei Wang

Authors
  1. Yiqun Huang
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  2. Yiran Li
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  3. Man Zhang
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  4. Boyu Deng
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  5. Hao Kong
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  6. Junfeng Wang
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  7. Junfu Lyu
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  8. Hairui Yang
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  9. Lingmei Wang
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Correspondence to Hairui Yang or Lingmei Wang.

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Huang, Y., Li, Y., Zhang, M. et al. Effective diffusivity of oxygen in the ash layer of Huadian oil shale semicoke. Front. Energy 15, 320–327 (2021). https://doi.org/10.1007/s11708-020-0674-3

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  • DOI: https://doi.org/10.1007/s11708-020-0674-3

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