摘要
采用小型流化床研究了在O2/CO2气氛下添加石灰石对PM2.5(空气动力学直径小于2.5μm的颗粒物)的控制。实验采用荷电低压撞击器(ELPI)采集和分析燃烧后的PM2.5。结果表明,添加石灰石是燃烧过程中影响PM2.5生成的重要因素。添加石灰石后,生成PM1.0的数量浓度均降低,而PM1.0～2.5的数量浓度均略有增加;PM2.5质量粒径分布均呈双峰分布,峰值分别出现在0.2和2.0μm左右。随着Ca/S物质的量比的增加,PM2.5中Si、Na、K、S和Cu的含量呈减少的趋势;随着颗粒粒径的减小,S、Cu、K和Na的含量有增大的趋势,而Si的含量有减少的趋势。
The effect of limestone addition on the emission characteristics of PM2.5 （particulates with aerodynamic diameter less than 2.5 μm） was studied in a fluidized bed combustor. The combustion tests were carried out at 1 123 K under O2/CO2 atmosphere. The PM2.5 generated from coal combustion was collected and analyzed with an Electrical Low Pressure Impactor （ELPI）. The results indicate that limestone has a great effect on the formation of PM2.5 during coal combustion under O2/CO2 atmosphere. The concentration of PM1.0 is diminished; but the concentration of PM1.0-2.5 is enhanced slightly with the addition of limestone. The mass size distribution of PM2.5 is similar, which displays two peaks around 0.2 and 2.0 μm, respectively. As the molar ratio of Ca/S increases, the concentrations of Si, Na, K, S, and Cu decrease. As the particle size decreases, the concentrations of S, Cu, K, and Na increase, but the concentrations of Si decrease.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2013年第8期1020-1024,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(50806020)
河南省教育厅科学技术研究重点项目(13A470238)
