关键词: 锅炉, 配风方式, 氧分布, 颗粒物浓度, 优化调整, 试验研究

Abstract: After the low-NOx reformation of a 90 t/h natural circulation gas boiler burner in a refinery, the operation adjustment is always unsatisfactory. Under 40%～90% load conditions, the temperature differences of furnace chamber, high temperature/low temperature section of superheater and flue gas on both sides of coal saver are large, the NOx content and the oxygen content are high, and the emission concentration of particulate matter is high. After analysis, the main cause of these problems is the uneven air distribution of the four burners. In response to this problem, the air distribution of the four burners is optimized and adjusted. After optimization, the temperature difference of flue gas on the α/β side of the boiler coal saver is reduced by 30 ℃, the temperature difference of the two sides inside the furnace chamber is reduced by 9 ℃, the temperature difference of the high temperature sections of the superheater is reduced by 40 ℃/30 ℃, and the temperature at each measuring point changes greatly on the α side and slightly on the β side. The content of NOx decreased by nearly 100 mg/m3, the concentration of particulate matter is reduced from 16.3 mg/m3 to 5.8 mg/m3, which effectively solves the problems of partial combustion on both sides of the boiler, uneven distribution of O₂, high content of NOx, and high emission concentration of particulate matter.

Key words: boiler, air distribution method, oxygen distribution, particle concentration, optimization adjustment, experimental study