| With the continued growth of thermal power capacity in our country, the amount of NO_X emissions are also increasing year by year, which will cause serious damage to the human environment.On the view of our government are paying more efforts on controlling NO_X emissions, the implementation of charges of NO_X pollution has a significant impact on the benefit of power plant. From the environmental benefits and economic point of view of the power plant, the effective control on the NO_X emissions should be strengthen. Low NO_X burner is a kind of simple and cost-effective low NO_X techniques.This paper studied dentate low-NO_X burner which based on flame stability in recirculation zone and influence on NOx formation. On the base of the bluff-body burner, small bluffs are disposed on the center bluff as well as the other ones are disposed around the burner. Because of the existence of the bluff-bodies, pulverized coal steadily catch fire for formation of the recirculation zone and NO_X exhaust also will be reduced by rich and lean separation technique.Through the cold-state test of dentate low-NO_X burner, velocity field distribution and concentration of pulverized coal distribution are quantified. By analyzing the experimental results, we obtain the influence of center bluffs and samll bluffs to the recirculation zone, the relationship between velocity field distribution and concentration of pulverized coal, how they are influenced by the bluffs, and the interaction of them. The influence of the velocity field and concentration of pulverized coal distribution to the stability of coal combustion in the initial stage are discussed.The hot condition experiment of dentate low NO_X burner are carried out on a horizontal single-furnace system. NO_X, CO, HCN, CH4, CO2, O2, temperature are quantified and then analyse the results.This experiment establish a good foundation for further industrial utilization. |
