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Study on the capacity of high-temperature melting technology to treat coal gasification fine slag and characterization of slag obtained

Author

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  • Zhou, Li
  • Ren, Qiangqiang
  • Liang, Chen
  • Wang, Wenyu
  • Li, Wei

Abstract

Due to a lack of well-established industrial utilization technology, the large storage of coal gasification fine slag (CGFS) has caused environmental pollution and resource waste. The high-temperature melting (HTM) system can separate carbon from CGFS and make ash melt to form slag. In this study, the capacity of HTM with two different cooling structures in disposing massive CGFS was explored through bench-scale experiments, the resulting slag was characterized and the feasibility of slag as the starting material to prepare porous glass-ceramic through inorganic gel casting was studied. The rate of capturing slag and decarburization of the system with a molten bath are 88.60% and 91.00%, respectively, both better than the system with a radiation heat exchanger. As for the indicators of alkali activation potential for product slag, such as the content of unburned materials and vitreous phase, the system with the molten bath had a more optimistic performance. But the problems of low vitreous phase content and uneven composition are faced with it. In order to improve the ability of the slag to be alkali-activated, it is necessary to take measures to promote the full mixing of the melt and increase the cooling rate of the slag.

Suggested Citation

  • Zhou, Li & Ren, Qiangqiang & Liang, Chen & Wang, Wenyu & Li, Wei, 2023. "Study on the capacity of high-temperature melting technology to treat coal gasification fine slag and characterization of slag obtained," Energy, Elsevier, vol. 272(C).
    • Handle: RePEc:eee:energy:v:272:y:2023:i:c:s0360544223005844
    DOI: 10.1016/j.energy.2023.127190
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    References listed on IDEAS

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    1. Wang, Wenyu & Li, Wei & Liang, Chen & Zhou, Li & Ren, Qiangqiang, 2023. "Decarburization and ash characteristics during melting combustion of fine ash from entrained-flow gasifier," Energy, Elsevier, vol. 263(PA).
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    Cited by:

    1. Wang, Wenyu & Li, Wei & Liang, Chen & Lu, Yu & Guo, Shuai & Ren, Qiangqiang, 2024. "Resource utilization of gasified fine ash from entrained flow bed via thermal modification-melting combustion: A pilot study," Energy, Elsevier, vol. 299(C).
    2. Nie, Chun-chen & Jiang, Si-qi & Shi, Shun-xiang & Lyu, Xian-jun & Zhao, Yong-qiang & Zhu, Xiang-nan, 2023. "Energy recovery from concentrate in waste gasification fine slag by clean flotation assisted by waste oil collector," Energy, Elsevier, vol. 273(C).

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