Abstract
AbstractThe mechanism and effect of char on N2O formation and reduction during circulating fluidized bed coal combustion were examined in a bench‐scale circulating fluidized bed. It was found that char derived from coal with high volatile matter content has a higher conversion ratio from char‐N into N2O during char combustion. Furthermore, char with greater pore volume and specific surface area not only shows a higher conversion ratio from char‐N into N2O, but also has stronger N2O reduction ability. Big pores play the main part in N2O diffusion inside char particles whereas small pores play the main part of chemical reaction. Molecular diffusion and Knudsen diffusion are both important for N2O diffusion in char. The reactivity of char concerning N2O formation and reduction is closely related to its pore characteristics, which is an important factor to account for the diverse N2O emissions from combustion of various coals in a circulating fluidized bed.
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