Abstract
Large eddy simulation of a lab-scale turbulent pulverized coal jet flame is conducted using the extended flamelet/progress variable (FPV) approach, where normalized total enthalpy, char conversion parameter, progress variable, coal mixture fraction and coal mixture fraction variance are selected as the control parameters for a five-dimensional flamelet library. Two ways of fuel-N partitioning between volatiles and char are applied for NO formation in two cases, respectively. The model performance is evaluated by comparing with the experimental data. The results indicate that the present model can well reproduce the pulverized coal flame. Reasonably good agreements on particle dispersion and velocity, temperature as well as major species distributions are obtained. In addition, the distributions of NO obtained with different treatments are analyzed qualitatively as well as quantitatively. The results indicate that the extended FPV approach shows an advantage over the conventional post-processing approach. When reasonable fuel-N partitioning is considered, a more accurate NO prediction can be achieved. Finally, combustion and NO emission characteristics are further discussed.
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