Gaseous emissions during oxy-fuel combustion of sewage sludge in a circulating fluidized bed
2020
Kosowska-Golachowska, Monika | Luckos, Adam | Kijo-Kleczkowska, Agnieszka | Musiał, Tomasz | Wolski, Krzysztof | Środa, Katarzyna
Emissions of NO, N₂O, NO₂, SO₂ and CO were measured during oxy-fuel combustion of sewage sludge and a reference fuel (bituminous coal) in a 12 kW bench-scale CFB combustor. Combustion tests were conducted at temperature of 850 °C in air (base case) and O₂ + CO₂ mixtures with oxygen concentrations 21, 30 and 40%vol. The effects of oxygen concentration in oxidizing atmosphere and fuel type on gaseous emissions are evaluated. Instantaneous and average emissions of NO, N₂O and SO₂ for the combustion of sewage sludge in all atmospheres were much higher than those for the combustion of reference coal. As the oxygen concentration in O₂/CO₂ atmosphere increases, NO and SO₂ emissions increase while N₂O and CO concentrations decrease. The fractional conversions of fuel-N to NOx and N₂O are calculated and compared for both fuels. Despite the high content of nitrogen in sewage sludge, the total conversion ratios of the fuel N to NOₓ and N₂O for sewage sludge were much lower than those for coal.
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