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Understanding the effect of the atmosphere on the release of alkali and alkaline-earth metals (AAEM) during oxy-fuel combustion is important for the development of oxy-fuel combustion technologies with reduced problems with particulate formation and corrosion. To this end, we examined the release behavior of AAEM during oxy-fuel combustion in different gas environments. A drop-tube reactor and ion...
The formation of PM 10 (particles less than or equal to 10μm in aerodynamic diameter) during char combustion in both air-firing and oxy-firing was investigated. Three Chinese coals of different ranks (i.e., DT bituminous coal, CF lignite, and YQ anthracite) were devolatilized at 1300°C in N 2 and CO 2 atmosphere, respectively, in a drop tube furnace (DTF). The resulting N ...
The ignition temperatures of a Loy Yang brown coal and a Datong bituminous coal were investigated in a wire-mesh reactor where the secondary reactions of the evolved volatiles were minimised. An increase in the average particle ignition temperature of 21°C was observed for the brown coal when air (21% O 2 +79% N 2 ) was replaced with a mixture of 21% O 2 +79% CO 2 ...
Experimental investigation of the combustion of an air-dried Victorian brown coal in O 2 /N 2 and O 2 /CO 2 mixtures was conducted in a lab-scale drop-tube furnace (DTF). In situ diagnostics of coal burning transient phenomena were carried out with the use of high-speed camera and two-colour pyrometer for photographic observation and particle temperature measurement,...
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