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

Zeyu Liu, Xiao Yuan, Jiaying Xing and Chunbo Wang

Energy, 2025, vol. 329, issue C

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.

Keywords: Deep peak-shaving; Low-load; Coal; Fly ash; Arsenic release; Arsenic adsorption (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:329:y:2025:i:c:s036054422502376x

DOI: 10.1016/j.energy.2025.136734

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