NO and N₂O Formation/Decomposition Characteristics During Co-Combustion of Coal With Biomass

Co-combustion technologies of coal with biomass have been applied in many practical coal combustion boilers in order to reduce CO₂ emission, fuel cost and so forth. Furthermore, the biomass may be able to enhance the combustion performance and to control NOx and N₂O emissions since the biomass contains high volatile matter and evolves NH₃ as the main volatile N-species. This study focuses on NOx and N₂O emission characteristics during co-combustion of coal with biomass. The main results obtained show that emission amount of NO and N₂O during co-combustion is relatively more than that during coal combustion. At least, NO behavior can be simulated by the homogeneous reaction scheme relating to NOx even at constant temperature. However, the N₂O behavior will be influenced by heterogeneous schemes due to char particles during co-combustion.