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Experimental and kinetic study of steam gasification of low-rank coal in molten blast furnace slag

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  • Duan, Wenjun
  • Yu, Qingbo
  • Liu, Junxiang
  • Wu, Tianwei
  • Yang, Fan
  • Qin, Qin

Abstract

In this study, the isothermal tests for steam gasification of Dezhou (DZ) low-rank coal with molten blast furnace slag (BFS) were performed in a lab-scale continuous gasification system, to investigate the status of gasification and syngas production. The results showed that molten BFS provided the heat needed for gasification reaction to ensure gasification is successful. The carbon conversion efficiency (CE), cold gasification efficiency (CGE) and percentage of combustible gas were higher than 85%, 100% and 87%, respectively. Meanwhile, thermo-gravimetric kinetic experiments were conducted to obtain the role of BFS in low-rank coal gasification. The study found that carbon conversion at a certain time was significantly enhanced with BFS as heat carrier. The reactivity index of coal was also improved under this condition. The reactivity index of coal with steam to coal (S/C) ratio of 1:2 was approximately 1.98 times higher than that with S/C ratio of 1:0 at 1673 K. The most probable kinetic mechanism model of DZ low-rank coal turned from D2 model to A2 model. Not only was BFS the heat carrier, but also it was the active catalyst in low-rank coal gasification. Eventually, the catalytic mechanism of coal gasification using BFS as heat carrier was schematically proposed.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:111:y:2016:i:c:p:859-868
    DOI: 10.1016/j.energy.2016.06.052
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    4. Li, Fenghai & Zhao, Chaoyue & Guo, Qianqian & Li, Yang & Fan, Hongli & Guo, Mingxi & Wu, Lishun & Huang, Jiejie & Fang, Yitian, 2020. "Exploration in ash-deposition (AD) behavior modification of low-rank coal by manure addition," Energy, Elsevier, vol. 208(C).
    5. Duan, Wenjun & Wu, Qinting & Li, Peishi & Cheng, Peiwen, 2022. "Techno-economic analysis of a novel full-chain blast furnace slag utilization system," Energy, Elsevier, vol. 242(C).
    6. Yao, Xin & Liu, Yang & Yu, Qingbo & Wang, Shuhuan, 2023. "Energy consumption of two-stage system of biomass pyrolysis and bio-oil reforming to recover waste heat from granulated BF slag," Energy, Elsevier, vol. 273(C).
    7. Li, Fenghai & Liu, Quanrun & Li, Meng & Fang, Yitian, 2018. "Understanding fly-ash formation during fluidized-bed gasification of high-silicon-aluminum coal based on its characteristics," Energy, Elsevier, vol. 150(C), pages 142-152.
    8. Yuan, XiangZhou & Fan, ShuMin & Choi, Seung Wan & Kim, Hyung-Taek & Lee, Ki Bong, 2017. "Potassium catalyst recovery process and performance evaluation of the recovered catalyst in the K2CO3-catalyzed steam gasification system," Applied Energy, Elsevier, vol. 195(C), pages 850-860.
    9. 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.
    10. 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).
    11. 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.

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