SNCR脱硝技术在循环流化床锅炉上的应用

Application of SNCR Denitration Process in Circulating Fluidized- bed Boiler

目前国内锅炉燃煤消耗量大，导致NOx的排放量逐年增加，针对这种情况，在循环流化床锅炉上采用了既能控制原始生成量又能有效地脱除NO、的脱硝技术。实现了尾部烟气的达标排放。为了控制原始生成量，采取了以下几方面措施：①设计合理的炉膛温度；②均匀的炉膛温度场（炉膛上下温差低于10℃）；③低氧高效的燃烧方式等，实现了原始生成量的低排放。循环流化床锅炉的NO。生成量通常在300mg／m^3以下，在循环流化床锅炉上采用SNCR脱硝技术，脱硝率可以达到70％～80％，完全能满足当前小于100mg／m^3的环保排放要求。

To minimize the NOx emission from coal combustions, the technologies of controlling the NOx formation and process of denitration are applied in the circulating fluidized - bed boiler to realize on - specification emission of flue gas. To control the original formation of NOx, the following measures are adopted, i.e. appropriate furnace chamber design temperature, uniform furnace chamber temperature field and low - oxygen high - efficiency combustion. As the original formation emission of NOx is as low as 300 mg/m^3 or lower, the application of denitration process SNCR in circulating fluidized -bed boiler can remove 70% 80% of nitrates, which meets the 100 mg/m^3 emission requirement for environment protection.