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Efficiency of Small Scale Manually Fed Boilers —Mathematical Models

Author

Listed:
  • Nebojsa Dedovic

    (Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, Novi Sad 21000, Serbia)

  • Sasa Igic

    (Faculty for Economics and Engineering Management, University Business Academy, Cvecarska 2, Novi Sad 21000, Serbia)

  • Todor Janic

    (Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, Novi Sad 21000, Serbia)

  • Snezana Matic-Kekic

    (Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, Novi Sad 21000, Serbia)

  • Ondrej Ponjican

    (Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, Novi Sad 21000, Serbia)

  • Milan Tomic

    (Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, Novi Sad 21000, Serbia)

  • Lazar Savin

    (Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, Novi Sad 21000, Serbia)

Abstract

This study reviews test results for a biomass-fired hot water boiler with a nominal boiler thermal power of 120 kW. In the experiments, prismatic wheat straw bales were used as biomass. The impact of the quantity (220, 290, 360 and 430 m 3 h −1 ) of inlet air fed to the boiler firebox was continuously monitored. This was to examine the influence of the quantity of inlet air and recirculation (0, 16.5 and 33%) of combustion products on the boiler thermal power and boiler energy efficiency. Thus, the following mathematical models and formulas were presented: correlation between boiler thermal power and bale residence time; bale mass loss during the combustion process; correlation between boiler energy efficiency and bale residence time. Mathematical models were obtained by using experimental data and by applying nonlinear regression analysis. Adjustment evaluation of mathematical models with experimental data was performed based on the determination coefficient, t -test and F -test. Increase the amount of air throughout the firebox produced boiler thermal power increase and bale residence time decrease. It was shown that combustion products recirculation of 16.5% partly improved boiler characteristics, while the recirculation of 33% did not, comparing with the case without recirculation.

Suggested Citation

  • Nebojsa Dedovic & Sasa Igic & Todor Janic & Snezana Matic-Kekic & Ondrej Ponjican & Milan Tomic & Lazar Savin, 2012. "Efficiency of Small Scale Manually Fed Boilers —Mathematical Models," Energies, MDPI, vol. 5(5), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:5:p:1470-1489:d:17749
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    References listed on IDEAS

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    1. Gustavsson, Leif & Börjesson, Pål & Johansson, Bengt & Svenningsson, Per, 1995. "Reducing CO2 emissions by substituting biomass for fossil fuels," Energy, Elsevier, vol. 20(11), pages 1097-1113.
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    Cited by:

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    2. Yaashikaa, P.R. & Kumar, P. Senthil, 2022. "Valorization of agro-industrial wastes for biorefinery process and circular bioeconomy: A critical review," MPRA Paper 112234, University Library of Munich, Germany.

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