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Composition of Flue Gases during Oxy-Combustion of Energy Crops in a Circulating Fluidized Bed

Author

Listed:
  • Monika Kosowska-Golachowska

    (Department of Thermal Machinery, Czestochowa University of Technology, Armii Krajowej 21, 42-201 Czestochowa, Poland)

  • Adam Luckos

    (Braamfontein Campus East, School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg 2050, South Africa)

  • Tomasz Czakiert

    (Department of Advanced Energy Technologies, Czestochowa University of Technology, Dabrowskiego 73, 42-201 Czestochowa, Poland)

Abstract

In recent years, global warming and climate change associated with emissions of CO 2 from fossil fuel-fired power systems are a big worry for authorities in many countries worldwide. The utilization of biomass as an alternative, carbon-neutral fuel can reduce emissions of CO 2 and other greenhouse gases. Furthermore, the coupling of oxy-combustion of biomass with CO 2 capture is an option for carbon-negative power generation technology. In this study, emissions of NO x , SO 2 , and CO from the air- and oxy-combustion of three energy crops ( Miscanthus giganteus , Sida hermaphrodita , and Salix viminalis ) are presented and compared with emissions from other biomass fuels and reference coal. Combustion tests in air and O 2 /CO 2 mixtures were conducted in a 12-kW bench-scale CFB combustor at 850 °C. Measurements of flue gas compositions were taken using an FTIR spectrometer. In all tested atmospheres, emissions of SO 2 , N 2 O, and CO for biomass were lower than those for the reference coal. The oxidation of volatile nitrogen compounds was behind high emissions of NO x from biomass burned in air and O 2 /CO 2 mixtures. The lowest concentrations of NO were found in the 21% O 2 /70% CO 2 mixture. Combustion in mixtures containing more oxygen (30% and 40% O 2 ) led to a decrease in emissions of N 2 O and CO and an increase in emissions of NO and SO 2 .

Suggested Citation

  • Monika Kosowska-Golachowska & Adam Luckos & Tomasz Czakiert, 2022. "Composition of Flue Gases during Oxy-Combustion of Energy Crops in a Circulating Fluidized Bed," Energies, MDPI, vol. 15(19), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:19:p:6889-:d:920172
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    References listed on IDEAS

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    1. Lasek, Janusz A. & Janusz, Marcin & Zuwała, Jarosław & Głód, Krzysztof & Iluk, Andrzej, 2013. "Oxy-fuel combustion of selected solid fuels under atmospheric and elevated pressures," Energy, Elsevier, vol. 62(C), pages 105-112.
    2. Joseba Moreno & Matthias Hornberger & Max Schmid & Günter Scheffknecht, 2021. "Oxy-Fuel Combustion of Hard Coal, Wheat Straw, and Solid Recovered Fuel in a 200 kW th Calcium Looping CFB Calciner," Energies, MDPI, vol. 14(8), pages 1-17, April.
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