Research On The Low NO_X Burner For Suitability Of Wide Coal Quality

The coal burning boiler is the most widespread power equipment in the electrical industry. Recently, the NO_X release for the boiler has been an urgently resolving environment problem. The NO_X release overproof and large fluctuation character are researched against one plant in the paper.Aimed at a boiler, by means of changing running parameters such as every layer distribution of the burner, load, method of operation for coal mill, excess air coefficient of the furnace and so on, NO_X discharge concentration, carbon content of the flying ash and the fume outlet temperature of the air heater are mensurated, then the optimal operation condition is summarize in different conditions to reduce the NO_X discharge.. These provide the reference for the lower NO_X burner for wide coal quality of tangential firing boiler.The furnace flow, heat and mass transfer and combustion process are studied. The velocity and temperature field for the furnace are gained. The NO_X distribution is presented. These are compared with practical situation and the results of numerical simulation are validated. The feasibility to cut down NO_X discharge and effect of the retrofit programs are forecasted under different conditions. The suitability of coal quality is testified by lower quality coal after lower NO_X burner.Based on field test and numerical simulation, Adopting fractional combustion can reduce the NO_X discharge concentration, and the fractional degree is stronger to reduce the NO_X discharge more profitably. The NO_X discharge concentration fall by 47.6% under the optimal air fractional distribution. The stable combustion of low load and NO_X discharge reach perfect level when the boiler retrofitted after using the low NO_X burner is proved by net calorific power check coal.