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Characterization of arsenic release from low-load coal combustion and its capture by fly ash

Author

Listed:
  • Liu, Zeyu
  • Yuan, Xiao
  • Xing, Jiaying
  • Wang, Chunbo

Abstract

Deep peak-shaving mitigates grid fluctuations from wind and solar power. This study found that low-load operation reduces arsenic emissions from coal-fired power plants by decreasing arsenic release from coal and enhancing fly ash adsorption. The lower temperature under low-load conditions inhibited arsenic release, while higher oxygen concentrations had the opposite effect. In general, the effect of temperature was more pronounced, with the arsenic release rate under low-load conditions being less than half of high loads. Moreover, fly ash formed under low-load conditions has a developed pore structure and more active adsorption sites, resulting in an increase of more than 40 % in its arsenic capture capacity compared to the high loads. However, low-load operation increased arsenic content and the proportion of As(III) in fly ash, raising concerns about potential leaching risks.

Suggested Citation

  • Liu, Zeyu & Yuan, Xiao & Xing, Jiaying & Wang, Chunbo, 2025. "Characterization of arsenic release from low-load coal combustion and its capture by fly ash," Energy, Elsevier, vol. 329(C).
    • Handle: RePEc:eee:energy:v:329:y:2025:i:c:s036054422502376x
    DOI: 10.1016/j.energy.2025.136734
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