Low-nitrogen combustion reformation for boiler burner

Abstract

Abstract In view of the current reformation for denitrification and cost reduction in coal-fired power plants, the boiler burner was upgraded in our company. On the basis of the comprehensive study of the low nitrogen burners of the major coal-fired power plants, the following low nitrogen retrofit measures were implemented: low NOx retrofit measures of the burners, anti-slagging and anti-corrosion measures, as well as high-efficiency measures for stable combustion. The results showed that the improved burner had better air counterweight ratio and could ensure the stable combustion of pulverized coal. Under the pure coal condition, NOx was reduced from 600mg/m3 to 210mg/m3. Under the mixed combustion condition, NOx in the flue gas decreased from 410mg/m3 to 160mg/m3. The boiler efficiency was slightly improved after the reformation, for the boiler efficiency increased from 91.49% to 91.79% under the condition of gas mixing and increased from 92.92% to 93.79% under pure coal condition. As shown above, the NOx emission for burner was reduced without affecting the working efficiency and the cost of denitration was also controlled after reformation.