O2/CO2气氛添加高岭石对燃煤PM2.5排放的影响

Effect of kaolinite additive on |formation of PM2.5 under O2/CO2 atmosphere during coal combustion

    摘要
  • 摘要: 采用管式炉研究了在O2/CO2气氛下添加高岭石对PM2.5(空气动力学直径小于2.5μm的颗粒物)排放特性的影响。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,添加高岭石是燃烧过程中影响PM2.5生成的重要因素。添加高岭石后，生成PM1的数量和质量浓度均降低，而PM1~2.5的数量和质量浓度均略有增加，PM2.5粒径分布均呈双峰分布，峰值点分别出现在0.2μm和2.0μm左右。随着高岭石添加质量比的增加，PM2.5中的S、Pb、Cu、Na和K五种元素的浓度呈下降趋势。粒径小于0.317μm的亚微米颗粒通过气化-凝结机理形成，而超微米颗粒则是通过亚微米颗粒凝聚、聚结和矿物质熔融、破碎、聚结形成。

     

    Abstract: The influence of kaolinite additive on the emission characteristics of PM2.5 (particulates with aerodynamic diameter less than 2.5μm) was studied with a tube furnace. The combustion tests were carried out at 1123K 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 kaolinite is an important factor for the formation of PM2.5 during coal combustion under O2/CO2 atmosphere. The number and mass concentrations of PM1 diminish, but those of PM1~2.5 enhance slightly after kaolinite is added. The size distributions of PM2.5are similar, which display two peaks around 0.2μm and 2.0μm, respectively. With increasing the weight ratio of kaolinite, the concentrations of S, Pb, Cu, Na and K decrease. The submicron-size ash particles smaller than 0.317μm are formed via nucleation of vaporized ash components. The supermicron-size ash particles are formed by coagulation and coalescence of the submicron-size ash, and fragmentation and coalescence of mineral matter.

     

    • HTML全文
    • 参考文献(0)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回