Emissions reduction from wood pellet stoves by uniform feeding

L. Da Lio, M. Bortolus and P. Canu

Renewable Energy, 2025, vol. 242, issue C

Abstract: The instantaneous fuel-to-air ratio in pellet stoves may vary because of the feeding mechanism. The pellet feed flow rate variability of a standard screw feeder was quantitatively assessed with real-time measurements. Temporary excess or deficit of pellets commonly occur. The variability can be significantly reduced with a new feeder, by approx. 70%, both at nominal (full) and partial (half) load operation. The analysis of the instantaneous emissions reveals that the fuel feed instabilities cause temporary sub-optimal fuel-to-air ratio and, in turn, peaks of pollutants emissions. The impact on the emissions of a more regular pellet feeder is impressive. A reduction of CO emission by 46% and 37.5%, and of PM by 52% and 44% at nominal and partial load, respectively was measured. NOx emissions are less affected by a more uniform feed rate, being predominantly from fuel nitrogen.

Keywords: Pellet stove; Biomass combustion; Emissions; Particulate matter; Screw feeder (search for similar items in EconPapers)
Date: 2025
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:242:y:2025:i:c:s0960148124023413

DOI: 10.1016/j.renene.2024.122273

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