作　　者： ; ; ; (张千）;

机构地区： 华北电力大学能源动力与机械工程学院电站设备状态监测与控制教育部重点实验室

出　　处： 《中国电机工程学报》 2011年第8期1-6,共6页

摘　　要： 为控制NOx排放,在1 025 t/h锅炉上进行了燃烧调整试验。通过改变氧量、上三次风、燃尽风以及二次风配风方式等因素,研究不同工况下NOx浓度及锅炉效率变化规律。试验表明,不同氧量工况下炉内火焰平均温度基本不变,随氧量增加,燃料型NOx急剧增加,锅炉效率升高;随上三次风比例增加,NOx和锅炉效率都下降;随着燃尽风挡板开度增大,炉内火焰平均温度下降,NOx排放浓度下降,锅炉效率变化较小;不同配风方式下,束腰型配风工况的锅炉效率最高,NOx排放量最低,均匀配风工况下NOx排放浓度增加了14.20%。在保持一定锅炉效率的前提下,燃烧调整可以降低NOx排放浓度10%～20%。 The combustion-adjustment experiments for NOx emission reduction were performed on an 1025 t/h boiler. By changing the factors such as the oxygen content, top tertiary-air, overfire-air and the distribution of second-air, the regularity of NOx emissions concentration and boiler efficiency in different working conditions were studied, and the results indicates that change of average temperature of flame in furnace is very small under different oxygen concentrations. The fuel-NOx and the boiler efficiency rapidly become greater with increasing the oxygen content, but they decreases by increasing the top tertiary-air gradually. With the overfire-air increasing, average temperature of flame in furnace and NOx emission decreases, however this influence on boiler efficiency may be neglected. The experiments also confirmed that the most boiler efficient and the minimum NOx emissions occurres in constricted air distribution mode, by comparison, in uniform mode, the NOx emissions increases 14.20%.On the premise of a certain boiler efficiency, the NOx emissions can be reduced by 10%～20% through combustion-adjustment.

关 键 词： 燃烧 排放 三次风 燃尽风 锅炉效率

领　　域： [动力工程及工程热物理]