Pollutant Emissions during Oxy-Fuel Combustion of Biomass in a Bench Scale CFB Combustor

Monika Kosowska-Golachowska, Adam Luckos and Agnieszka Kijo-Kleczkowska
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Monika Kosowska-Golachowska: Department of Thermal Machinery, Czestochowa University of Technology, Armii Krajowej 21, 42-201 Czestochowa, Poland
Adam Luckos: School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Braamfontein Campus East, Johannesburg 2050, South Africa
Agnieszka Kijo-Kleczkowska: Department of Thermal Machinery, Czestochowa University of Technology, Armii Krajowej 21, 42-201 Czestochowa, Poland

Energies, 2022, vol. 15, issue 3, 1-23

Abstract: Nowadays oxy-fuel combustion of coal and biomass is the most promising option for the reduction of CO 2 emissions from power plants. In this paper, emissions of NO x (NO, NO 2 , N 2 O and their precursors, such as NH 3 and HCN), SO 2 and CO during conventional and oxy-fuel combustion of three kinds of biomass (agro, woody and energy crop) and a reference coal are presented and discussed. Combustion tests were conducted at 850 °C in the laboratory-scale circulating fluidized bed (CFB) reactor in air and O 2 /CO 2 atmospheres. A FTIR spectrometer was used to measure instantaneous concentrations of all pollutants in the flue gas. Emissions of SO 2 , N 2 O and CO for the combustion of biomass in all atmospheres were lower than those for the combustion of reference coal. It was found that oxidation of nitrogen species released with volatile matter was responsible for high emissions of NO x during combustion of biomass fuels in air and mixtures of O 2 and CO 2 . The lowest NO emissions for tested fuels were detected in oxy-21 atmosphere (21% O 2 /70% CO 2 ). Oxy-combustion of biomass in O 2 /CO 2 mixtures at 30% and 40% O 2 caused a decrease in emissions of N 2 O and CO while NO and SO 2 emissions increased. The results of this study show that the tested biomass fuels are ideal renewable energy resources both in conventional and oxy-fuel conditions with a minor potential for environmental pollution.

Keywords: oxy-combustion; circulating fluidized bed; wheat straw; Salix viminalis; Scots pine; renewable energy sources; NOx; SO 2; CO; CO 2 (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
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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