Study on Pollutant Emission Characteristics From Oxy-fuel Combustion of Coal With Recycled Flue Gas
Based on 15 kW one-dimensional download furnace, comparative experimental research on pollutant emissions from flue gas recycled combustion and air combustion were developed. It is found that for flue gas recirculation(FGR) combustion, the burnout rate of coal decreases 4.6%; In the flue gas, CO concentration increases a little, NOx and SO2 concentration in flue gas increased significantly, while the emission rate of NOx decreases. Electrical low pressure impactor(ELPI) measurement shows that there are two peaks in size distributions of PM10 mass concentration of both combustion conditions, but peaks in FGR combustion move to larger particle size. Observations of scanning electron microscope(SEM) and energy dispersive X-ray(EDX) show that PM10 in both experiments have the similar morphology and components. Analysis of inductively coupled plasma(ICP) show that most minor elements and trace elements distribution in PM10 from both combustion conditions are similar except Se. Se content in PM10 from FGR condition is significantly higher than that in air combustion, which might due to the promoted reaction between CaO and SeO2 by high H2O vapor concentration in FGR combustion.
flue gas recirculationoxy-fuel combustionparticulate matteremission characteristics
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