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Influence of air staging strategies on flue gas sensible heat losses and gaseous emissions of a wood pellet boiler: An experimental study

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  • Zadravec, Tomas
  • Rajh, Boštjan
  • Kokalj, Filip
  • Samec, Niko

Abstract

An effective air staging strategy is of great importance for achieving low emissions and sensible heat losses through flue gas extraction. In cases where a commercially available system needs to be optimised, often the only viable measure is the modification of process parameters. In this work, the aim is to (1) Discover a combination of the most suitable process parameters based on a multi-criteria decision-making method and (2) To unveil relevant correlations between the two process parameters under study (PA/SA ratio and excess air), emissions and combustion temperatures. A modified commercial small-scale hot water wood pellet boiler was installed into a laboratory heating system. Nine different cases have been addressed within a parametric study, differing in the PA/SA ratio and overall excess air. Emissions, temperatures inside the combustion chamber and the flow rate of air entering the combustion chamber were measured. A low PA/SA ratio of 0.53 (54.7% reduction from factory settings), combined with a low O2 concentration in the flue gases of 5.26% (39.8% reduction from factory settings), and the elimination of infiltration air resulted in a simultaneous reduction of NOx and CO emissions by 14.4% and 93.9% respectively and a flue gas sensible heat loss reduction of 31.6%.

Suggested Citation

  • Zadravec, Tomas & Rajh, Boštjan & Kokalj, Filip & Samec, Niko, 2021. "Influence of air staging strategies on flue gas sensible heat losses and gaseous emissions of a wood pellet boiler: An experimental study," Renewable Energy, Elsevier, vol. 178(C), pages 532-548.
    • Handle: RePEc:eee:renene:v:178:y:2021:i:c:p:532-548
    DOI: 10.1016/j.renene.2021.05.150
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    References listed on IDEAS

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    Cited by:

    1. Wenxiao Chu & Maria Vicidomini & Francesco Calise & Neven Duić & Poul Alborg Østergaard & Qiuwang Wang & Maria da Graça Carvalho, 2022. "Recent Advances in Low-Carbon and Sustainable, Efficient Technology: Strategies and Applications," Energies, MDPI, vol. 15(8), pages 1-30, April.
    2. Rocío Collado & Esperanza Monedero & Víctor Manuel Casero-Alonso & Licesio J. Rodríguez-Aragón & Juan José Hernández, 2022. "Almond Shells and Exhausted Olive Cake as Fuels for Biomass Domestic Boilers: Optimization, Performance and Pollutant Emissions," Sustainability, MDPI, vol. 14(12), pages 1-17, June.
    3. Sungur, Bilal & Basar, Cem, 2023. "Experimental investigation of the effect of supply airflow position, excess air ratio and thermal power input at burner pot on the thermal and emission performances in a pellet stove," Renewable Energy, Elsevier, vol. 202(C), pages 1248-1258.
    4. Sungur, Bilal & Basar, Cem & Kaleli, Alirıza, 2023. "Multi-objective optimisation of the emission parameters and efficiency of pellet stove at different supply airflow positions based on machine learning approach," Energy, Elsevier, vol. 278(PA).

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