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Numerical simulation of coal gasification in molten slag: Gas-liquid interaction characteristic

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  • Duan, Wenjun
  • Gao, Yunke
  • Yu, Qingbo
  • Wu, Tianwei
  • Wang, Zhimei

Abstract

The high quality waste heat recovery of the molten blast furnace slag was necessary and urgent. In this paper, the flow characteristic of the molten slag reactor was investigated by numerical simulation. Firstly, the three-dimensional model was established for investigating the gas-liquid two-phase flow. The gas-liquid flow was modeled to be turbulent, which was described by the RNG k-ε model, and the interface of gas and liquid was conducted by the VOF model. Secondly, the top-submerged cold experiment system was constructed to validate the accuracy of the simulation model. Thirdly, the bubble behavior, gas phase distribution and molten slag motion were investigated. The bubble in the reactor would go through five stages and the maximum gas fraction reached about 4.87% at 0.75s. Meanwhile, the gas phase distribution and molten slag motion were closely related to the bubble behavior. Ultimately, the matrix analysis method was applied to obtain the optimal parameters of the reactor. The optimal condition improved the flow behavior in the molten BFS reactor significantly. The present results of the simulation provided an insight for the gas-liquid two-phase flow in molten slag reactor, which would provide the theoretical guidance for industrial applications.

Suggested Citation

  • Duan, Wenjun & Gao, Yunke & Yu, Qingbo & Wu, Tianwei & Wang, Zhimei, 2019. "Numerical simulation of coal gasification in molten slag: Gas-liquid interaction characteristic," Energy, Elsevier, vol. 183(C), pages 1233-1243.
    • Handle: RePEc:eee:energy:v:183:y:2019:i:c:p:1233-1243
    DOI: 10.1016/j.energy.2019.06.178
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    References listed on IDEAS

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    1. Duan, Wenjun & Yu, Qingbo & Wang, Zhimei & Liu, Junxiang & Qin, Qin, 2018. "Life cycle and economic assessment of multi-stage blast furnace slag waste heat recovery system," Energy, Elsevier, vol. 142(C), pages 486-495.
    2. Luo, Siyi & Yi, Chuijie & Zhou, Yangmin, 2013. "Bio-oil production by pyrolysis of biomass using hot blast furnace slag," Renewable Energy, Elsevier, vol. 50(C), pages 373-377.
    3. Li, Yuan & Zhu, Lei, 2014. "Cost of energy saving and CO2 emissions reduction in China’s iron and steel sector," Applied Energy, Elsevier, vol. 130(C), pages 603-616.
    4. Duan, Wenjun & Yu, Qingbo & Xie, Huaqing & Qin, Qin, 2017. "Pyrolysis of coal by solid heat carrier-experimental study and kinetic modeling," Energy, Elsevier, vol. 135(C), pages 317-326.
    5. Yongqi Sun & Zuotai Zhang & Lili Liu & Xidong Wang, 2014. "Multi-Stage Control of Waste Heat Recovery from High Temperature Slags Based on Time Temperature Transformation Curves," Energies, MDPI, vol. 7(3), pages 1-12, March.
    6. Zhang, Hui & Wang, Hong & Zhu, Xun & Qiu, Yong-Jun & Li, Kai & Chen, Rong & Liao, Qiang, 2013. "A review of waste heat recovery technologies towards molten slag in steel industry," Applied Energy, Elsevier, vol. 112(C), pages 956-966.
    7. Wu, Xuecheng & Zhao, Liang & Zhang, Yongxin & Zhao, Lingjie & Zheng, Chenghang & Gao, Xiang & Cen, Kefa, 2016. "Cost and potential of energy conservation and collaborative pollutant reduction in the iron and steel industry in China," Applied Energy, Elsevier, vol. 184(C), pages 171-183.
    8. Sun, Yongqi & Seetharaman, Seshadri & Zhang, Zuotai, 2018. "Integrating biomass pyrolysis with waste heat recovery from hot slags via extending the C-loops: Product yields and roles of slags," Energy, Elsevier, vol. 149(C), pages 792-803.
    9. Duan, Wenjun & Yu, Qingbo & Liu, Junxiang & Wu, Tianwei & Yang, Fan & Qin, Qin, 2016. "Experimental and kinetic study of steam gasification of low-rank coal in molten blast furnace slag," Energy, Elsevier, vol. 111(C), pages 859-868.
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    1. Shen, Zhongjie & Zhou, Jie & Liu, Xia & Liang, Qinfeng & Liu, Haifeng, 2020. "A deep insight on the correlation between slag viscosity fluctuation and decomposition of sulfur-bearing minerals in the entrained flow gasifier," Energy, Elsevier, vol. 196(C).
    2. Xie, Huaqing & Li, Rongquan & Yu, Zhenyu & Wang, Zhengyu & Yu, Qingbo & Qin, Qin, 2020. "Combined steam/dry reforming of bio-oil for H2/CO syngas production with blast furnace slag as heat carrier," Energy, Elsevier, vol. 200(C).

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