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

Monika Kosowska-Golachowska, Adam Luckos and Tomasz Czakiert ()
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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

Energies, 2022, vol. 15, issue 19, 1-13

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 .

Keywords: biomass; oxy-fuel combustion; fluidized bed; Miscanthus giganteus; Sida hermaphrodita; Salix viminalis; wheat straw; Scots pine; bituminous coal (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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