NOx Formation and Reduction in Pulverized Coal Combustion

A simple reaction model is proposed for NOx formation and reduction occurred during coal combustion. These reaction rates are to be expressed by the Arrhenius type rate constant and the gas phase volatile, HeN, NH3, NOx and O2 concentrations. Experiments were conducted using a drop tube furnace (vertical laminar flow furnace) for various bituminous and anthracite coals ranging from 1.0 to 11 in the fuel ratio (fixed carbon/volatile nlatter). Although the rate constant of volatile evolution depends upon the coal type, those for NOx formation and reduction were found to be invariant with respect to the coal type.