Abstract
Validity of numerical simulation for pulverized coal combustion is assessed, and effects of moisture in coal on the pulverlized coal combustion are numerically investigated. The results show that the combustion characteristics for bituminous coals are in general agreement with the measurements provided that moisture content in the coal is zero. With increasing the moisture, flame temperature and O2 and NOx mole fractions in the region near the burner decreases, increases, and decreases respectively, and the positions where the flame temperature and NOx mole fraction show the maxima shift downward. Also, the increase of the moisture causes the increase of unburned fraction and the decrease of conversion ratio to NOx. It is found that the contribution of thermal NOx to the total NOx drastically decreases with increasing the moisture, whereas the emission of fuel NOx increases.
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