Abstract
In this study, NOx emission characteristics of oxy-coal combustion atmosphere have been thoroughly investigated employing the developed and validated numerical model under oxy-coal combustion atmosphere. The influence of oxy-fuel combustion atmospheres, feed gas inlet temperatures and pressures on the NOx emission (ppm) characteristics have been studied in detail. Influence of higher concentration steam addition on NOx emission under oxy-coal combustion atmosphere has also been assessed employing the developed oxy-coal combustion model. Furthermore, a quantitative summary of NOx emission at the outlet of the combustion chamber under above-mentioned operating conditions have been provided. The result showed that oxy-coal combustion cases having higher O2 concentration in the oxidizer had produced higher NOx emission due to an enhanced conversion rate of coal_N to NOx. The wet oxy-fuel combustion case (10–50% H2O in the oxidizer) has 2.5%–75% higher NOx concentration (ppm) compared to the ideal dry-recycle oxy-fuel combustion case (0% H2O in the oxidizer). The oxy-steam combustion case has 99% higher NOx concentration (ppm) compared to the ideal dry-recycle oxy-fuel combustion case.
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