Experimental study on direct biomass reburning denitrification

The performances of two species of biomass reburning processes and the effect of operating parameters on NOx removal efficiency were studied using the reburning boiler burner simulator facility. The results of the study show that there is an optimal range of denitrification for direct reburning condition in reburning reaction temperature, the stoichiometric ratio(SR),the reburning ratio, article size of biomass, the concentration of NOx in the main combustion zone. The smaller the particle size of biomass, NOx removal effect is more obvious. The best biomass denitration temperature range is 950-1050 degrees C and the stoichiometric ratio has a best value in different experimental conditions. When reburning ratio is in the range of 10% - 15%, the particle size has greater impact on the rate of denitrification. It is beneficial for NOx removal when NOx concentration in the main combustion zone is greater than 200ppm.