摘要
在6k Wth鼓泡流化床实验台上进行了城市污泥的燃烧实验,研究了烟气再循环气氛和空气气氛下燃烧温度、过量氧气系数、二次风比率对气态污染物排放特性的影响。研究结果表明:燃烧温度升高,NO排放浓度明显升高,SO_2排放浓度亦呈上升趋势;过量氧气系数提高,NO排放浓度呈显著上升趋势,SO_2排放浓度则呈下降趋势;增大二次风比率,NO排放浓度呈现先降低后升高的趋势,但总体减排效果并不明显,SO_2排放浓度出现少量增长;烟气再循环工况下,NO排放浓度随燃烧温度和过量氧气系数变化的趋势与空气气氛燃烧时一致;烟气再循环率从0增加至1,NO排放浓度明显下降;烟气再循环率达到较高值后,NO排放浓度随之提高而降低的趋势减弱;烟气再循环率逐渐升高过程的前期,烟气中CO浓度出现显著升高;再循环率超过0.3后,CO浓度在一定范围内波动,不再升高。
The combustion experiments of municipal sludge were carried out on the 6 k W th bubbling fluidized bed test bed to study the effect of combustion temperature,excess oxygen ratio and secondary air ratio on NO and SO2 emission characteristics in the flue gas recirculation atmosphere and air atmosphere.The results showed that the concentration of NO increased significantly and the SO2 emission concentration increased with the increase of the combustion temperature.With the excess oxygen ratio increased,the NO emission concentration increased significantly,and the SO2 emission concentration decreased.Increasing the secondary air ratio,NO emission concentration showed a tendency to decrease first and then increase,but the effect of emission reduction was not obvious,and the SO2 emission concentration increased slightly.In the flue gas recirculation atmosphere,the change of the NO emission concentration with the combustion temperature and the excess oxygen coefficient was consistent with that of the air atmosphere.With the flue gas recirculation rate increased from 0 to 1,NO emission concentration decreased significantly.When the flue gas recirculation rate reached a high value,the NO emission reduction trend decreased.In the early stage of the increase of flue gas recirculation rate,the concentration of CO in the flue gas increased significantly.When the recirculation rate exceeded 0.3,the CO concentration fluctuated within a certain range and no longer increased.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2018年第1期368-374,共7页
Chemical Industry and Engineering Progress
关键词
污泥
烟气再循环
一氧化氮
二氧化硫
流化床
sludge
flue gas recirculation
nitric oxide
sulfur dioxide
fluidized-bed
