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Transformation of heavy metals in lignite during supercritical water gasification

Author

Listed:
  • Chen, Guifang
  • Yang, Xinfei
  • Chen, Shouyan
  • Dong, Yong
  • Cui, Lin
  • Zhang, Yong
  • Wang, Peng
  • Zhao, Xiqiang
  • Ma, Chunyuan

Abstract

Transformation characteristics of heavy metals during lignite supercritical water gasification (SCWG) were studied. A sequential extraction procedure (modified Tessier method) was used to selectively extract different fractions of Pb, Cd, Cr, Mn, Cu, Ni, and Zn. Heavy metals transformed into more stable fractions after SCWG. For Pb, Cd, Mn, Cu, and Zn, SCWG reduced the bioavailability and the risks posed by heavy metals in lignite. Under the experimental conditions, the conversion rates for Pb and Cd were 16.0%–25.2% and 16.3%–23.4%, respectively, whereas those for Mn, Cu, and Zn were much lower. Solid products enriched with Pb, Cd, Mn, Cu, and Zn were obtained after SCWG; the contents of these metals varied slightly in the liquid products under different experimental conditions. Excess Cr and Ni that did not originate from lignite were found in the residues, owing to reactor corrosion during lignite SCWG. Higher temperatures alleviated corrosion, whereas higher pressures and equivalence ratios (ER) had the opposite effect. None of the heavy metals were detected in the gas phase under the experimental conditions used in the present study. The correlation between the distributions of heavy metals and the experimental conditions were also studied. The transformation pathways of Pb, Cd, Mn, Cu, and Zn during SCWG were deduced according to the experimental results.

Suggested Citation

  • Chen, Guifang & Yang, Xinfei & Chen, Shouyan & Dong, Yong & Cui, Lin & Zhang, Yong & Wang, Peng & Zhao, Xiqiang & Ma, Chunyuan, 2017. "Transformation of heavy metals in lignite during supercritical water gasification," Applied Energy, Elsevier, vol. 187(C), pages 272-280.
    • Handle: RePEc:eee:appene:v:187:y:2017:i:c:p:272-280
    DOI: 10.1016/j.apenergy.2016.11.054
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    References listed on IDEAS

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    1. Mansouri Majoumerd, Mohammad & Raas, Han & De, Sudipta & Assadi, Mohsen, 2014. "Estimation of performance variation of future generation IGCC with coal quality and gasification process – Simulation results of EU H2-IGCC project," Applied Energy, Elsevier, vol. 113(C), pages 452-462.
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    2. Li, Hongjun & Chang, Qinghua & Gao, Rui & Dai, Zhenghua & Chen, Xueli & Yu, Guangsuo & Wang, Fuchen, 2018. "Fractal characteristics and reactivity evolution of lignite during the upgrading process by supercritical CO2 extraction," Applied Energy, Elsevier, vol. 225(C), pages 559-569.
    3. Yang, Yuxuan & Zhong, Zhaoping & Li, Jiefei & Du, Haoran & Li, Qian & Zheng, Xiang & Qi, Renzhi & Zhang, Shan & Ren, Pengkun & Li, Zhaoying, 2023. "Experimental and theoretical-based study of heavy metal capture by modified silica-alumina-based materials during thermal conversion of coal at high temperature combustion," Applied Energy, Elsevier, vol. 351(C).
    4. Chen, Zhewen & Zhang, Xiaosong & Han, Wei & Gao, Lin & Li, Sheng, 2018. "A power generation system with integrated supercritical water gasification of coal and CO2 capture," Energy, Elsevier, vol. 142(C), pages 723-730.

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