【摘要】 在热输入为02MW的循环流化床试验台上进行了城市污泥与煤的混烧试验,着重研究了污泥/煤掺混质量比、空气过剩系数、二次风率等因素对NOx及N2O排放的影响.研究表明,随着污泥掺烧比例的增大,流化床密相区和稀相区的温度明显下降,烟气中NO和NO2的质量浓度均呈下降趋势,而N2O的质量浓度则明显上升;随着空气过剩系数的增加,NOx和N2O的排放质量浓度均呈增加趋势;在空气过剩系数保持不变的条件下,随着二次风率的增加,密相区的还原性气氛增强,NOx和N2O的排放质量浓度呈下降趋势.更多还原

【Abstract】 The tests of co-combustion of municipal sewage sludge and coal were conducted in a 0.2 MW circulation fluidized bed （CFB） test facility focusing on the influences of the ratio of sludge weight to coal weight, excess air ratio and second air ratio on NO_x and N₂O emission characteristics. The investigations show that with the increase of sludge proportion, the temperature in dense bed and freeboard decrease significantly while the emission of NO_x decreases and the emission of N₂O increases rapidly. With the increase of excess air ratio, the emissions of NO_x and N₂O increase. When the excess air ratio remains unchanged, the reducibility in the dense bed strengthens and the emissions of NO_x and N₂O reduce synchronously with the increase of second air ratio.更多还原