NOx emissions from fluidized-bed coal combustors

Role of ash on the NO formation during char oxidation of biomass

“…For biomass, some N 2 O is formed during the char oxidation stage, but reported concentration of N 2 O from biomass char combustion experiments are very low compared to concentrations of NO [1]. NO can be heterogeneously reduced to N 2 by char carbon [7]: Here, (ACN) is an active carbon site, not covered by oxygen and linked to nitrogen. (ACO) is an active carbon site covered by oxygen.…”

Pulverized coal combustion: Fuel nitrogen mechanisms in the rich post-flame

“…Previous study by Wendt et al (1976) concluded that pore s~ze of the char particles could influence the selectivity of char nitrogen conversion to NO. Reduction of NO on hot char surfaces was demonstrated in various studies by Pereira et al (1975, and Glass et al (1982). The simultaneous formation and reduction of NO in a single particle model was studied by Hahn et al (1983).…”

Incineration of Paper Sludge in a Prototype Vortexing Fluidized Bed Combustor

“…The operating temperature in a fluidized bed combustor (750-900 °C) is too low to form thermal NO x . 7,8 Thus, the fuel-NO x mechanism is taken into account for NO x formation in fluidized bed combustors. Figure 15 shows the effect of temperature on NO formation.…”