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Gasification Characteristics and Kinetics of Unburned Pulverized Coal in Blast Furnaces

Author

Listed:
  • Rian Zan

    (State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Wei Wang

    (State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Runsheng Xu

    (State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Johannes Schenk

    (Chair of Ferrous Metallurgy, Montanuniversität Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria)

  • Heng Zheng

    (Chair of Ferrous Metallurgy, Montanuniversität Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria)

  • Haoxiang Wang

    (State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China)

Abstract

Pulverized coal injected into a blast furnace (BF) burns incompletely in a very limited amount of time. A considerable amount of unburned pulverized coal (UPC) escapes from the raceway to the coke layer. The unburned pulverized coal reacts with CO 2 in the coke layer, and this has a very significant impact on the operation of the BF. The gasification reaction characteristics of the UPC with CO 2 were assessed by thermogravimetric analysis. The microstructure and specific surface area of the pulverized coal and UPC were characterized by scanning electron microscopy (SEM), and a specific surface area testing apparatus together with the Brunauer-Emmett-Teller (BET) method, respectively. The results showed that Qingding UPC requires a higher temperature to complete the gasification reaction. At the same heating rate, the T m (maximum reaction rate temperature) of the Shenhua UPC is much lower and the reaction rate is larger than those of the Qingding UPC. An increased heating rate is beneficial for the gasification reaction of the two UPCs. The kinetics analysis results showed that the optimal mechanism function models for the Shenhua and Qingding UPCs are chemical reaction models. The apparent activation energies of gasification of the Shenhua UPC and Qingding UPC under different conditions were 269.89–223.41 KJ/mol and 266.70–251.54 KJ/mol, respectively.

Suggested Citation

  • Rian Zan & Wei Wang & Runsheng Xu & Johannes Schenk & Heng Zheng & Haoxiang Wang, 2019. "Gasification Characteristics and Kinetics of Unburned Pulverized Coal in Blast Furnaces," Energies, MDPI, vol. 12(22), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4324-:d:286465
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    References listed on IDEAS

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    1. Heng Zheng & Wei Wang & Runsheng Xu & Rian Zan & Johannes Schenk & Zhengliang Xue, 2018. "Effect of the Particle Size of Iron Ore on the Pyrolysis Kinetic Behaviour of Coal-Iron Ore Briquettes," Energies, MDPI, vol. 11(10), pages 1-16, September.
    2. Du, Shan-Wen & Chen, Wei-Hsin & Lucas, John A., 2010. "Pulverized coal burnout in blast furnace simulated by a drop tube furnace," Energy, Elsevier, vol. 35(2), pages 576-581.
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    Cited by:

    1. Xiongchao Lin & Wenshuai Xi & Jinze Dai & Caihong Wang & Yonggang Wang, 2020. "Prediction of Slag Characteristics Based on Artificial Neural Network for Molten Gasification of Hazardous Wastes," Energies, MDPI, vol. 13(19), pages 1-18, October.

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