Investigating the potential of a waste-derived additive for enhancing coal combustion efficiency and environmental sustainability in a circular economy

Krzysztof Czajka, Krystian Krochmalny, Anna Kisiela-Czajka, Michał Ostrycharczyk, Michał Czerep, Monika Tkaczuk-Serafin, Marcin Baranowski, Niedźwiecki Łukasz, Pawlak-Kruczek Halina, Jóźwiak Kamila, Oksana M. Holovko-Kamoshenkova, Oleksii Provalov and Mykola Cherniavskyi

Energy, 2024, vol. 295, issue C

Abstract: This study examines the impact of a waste-derived additive from alumina and shale oil production on the performance of coal combustion. The effects of individual additive components were investigated under oxidant-limited and oxidizing conditions using the isothermal flow reactor (IFR) equipped with gas analysers. The raw materials, as well as fly chars/ashes derived from the IFR, were characterized using standard physicochemical analysis, oxide analysis, oxygen functional group determination, the ash fusion test, thermogravimetry, scanning electron microscopy and energy dispersive X-ray spectroscopy. Results from experiments conducted under oxidant-limited conditions demonstrated that the analysed additive, at a 1% share, increased hydrogen content in char by over 3.5 times (from 600 ppm to 2160 ppm) and enhanced methane conversion by nearly 20%. Under oxidizing conditions, the additive reduced unburned carbon loss by approximately 50%, emissions of NOx from 400-460 ppm to 340–390 ppm and SO2 from 1410-1475 ppm to 1325–1410 ppm. The study emphasized the influence of moisture on thermochemical processes, confirming that a certain amount of water vapour accelerates the conversion of H2, SO2, and NOX. The analysis supported the commercial utilization of the additive from economic, environmental, and operational standpoints.

Keywords: Catalyst; TG; Isothermal flow reactor; Pyrolysis; Drop tube furnace (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:295:y:2024:i:c:s0360544224008077

DOI: 10.1016/j.energy.2024.131035

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