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Single large wood log conversion in a stove: Experiments and modelling

Author

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  • Anca-Couce, Andrés
  • Caposciutti, Gianluca
  • Gruber, Thomas
  • Kelz, Joachim
  • Bauer, Thomas
  • Hochenauer, Christoph
  • Scharler, Robert

Abstract

Natural draft wood log stoves for residential bioheat production are very popular due to the low fuel costs, the ecological aspect of a renewable energy source and the visual appeal of the flame. However, they have rather high pollutant emissions, specially of unburnt products. The description of large wood logs conversion in stoves needs to be improved to allow a process optimization which can reduce these emissions. The transient conversion of a single wood log in a stove is experimentally investigated with test runs quenching the log after defined time intervals and measuring the flue gas composition and temperatures in the log and stove. The experiments have been described with a volumetric single particle model, which predicts with good accuracy the log conversion until a time of around 30 min, when pyrolysis is almost ending. At that point, log fragmentation takes place and smaller fragments are detached from the log falling onto the bed of embers. Despite the increase in external surface area, char oxidation takes place at a moderate rate. This last stage of wood log conversion in a stove is the most challenging to model. Finally, preliminary recommendations are provided for reducing CO emissions in wood log stoves.

Suggested Citation

  • Anca-Couce, Andrés & Caposciutti, Gianluca & Gruber, Thomas & Kelz, Joachim & Bauer, Thomas & Hochenauer, Christoph & Scharler, Robert, 2019. "Single large wood log conversion in a stove: Experiments and modelling," Renewable Energy, Elsevier, vol. 143(C), pages 890-897.
    • Handle: RePEc:eee:renene:v:143:y:2019:i:c:p:890-897
    DOI: 10.1016/j.renene.2019.05.065
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    Cited by:

    1. Čespiva, Jakub & Wnukowski, Mateusz & Niedzwiecki, Lukasz & Skřínský, Jan & Vereš, Ján & Ochodek, Tadeáš & Pawlak-Kruczek, Halina & Borovec, Karel, 2020. "Characterization of tars from a novel, pilot scale, biomass gasifier working under low equivalence ratio regime," Renewable Energy, Elsevier, vol. 159(C), pages 775-785.
    2. Mateusz Jackowski & Łukasz Niedźwiecki & Krzysztof Mościcki & Amit Arora & Muhammad Azam Saeed & Krystian Krochmalny & Jakub Pawliczek & Anna Trusek & Magdalena Lech & Jan Skřínský & Jakub Čespiva & J, 2021. "Synergetic Co-Production of Beer Colouring Agent and Solid Fuel from Brewers’ Spent Grain in the Circular Economy Perspective," Sustainability, MDPI, vol. 13(18), pages 1-17, September.
    3. Anca-Couce, A. & Hochenauer, C. & Scharler, R., 2021. "Bioenergy technologies, uses, market and future trends with Austria as a case study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    4. Chen, Tao & Sjöblom, Jonas & Ström, Henrik, 2022. "Numerical investigations of soot generation during wood-log combustion," Applied Energy, Elsevier, vol. 325(C).
    5. Krochmalny, Krystian & Niedzwiecki, Lukasz & Pelińska-Olko, Ewa & Wnukowski, Mateusz & Czajka, Krzysztof & Tkaczuk-Serafin, Monika & Pawlak-Kruczek, Halina, 2020. "Determination of the marker for automation of torrefaction and slow pyrolysis processes – A case study of spherical wood particles," Renewable Energy, Elsevier, vol. 161(C), pages 350-360.

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