团聚液雾化气泡粒径分布特性的可视化研究

Visualization study of reunion liquid atomization bubble size distribution characteristics

泡沫团聚法是有效脱除细颗粒物PM2.5的方法。本文对团聚液的雾化粒径进行了研究,筛选出适于团聚PM2.5的气泡粒径的溶液及喷雾条件。文中首先对气泡粒径与团聚颗粒物的能力进行估算,进而通过CCD拍摄精细雾化喷嘴喷出的团聚液泡沫的流动过程,利用MATLAB处理图片,得出雾化气泡粒径和密度大小。实验结果表明,发泡剂会使团聚液的雾化液滴形成气泡,增大雾化颗粒直径;PAM团聚液形成的气泡粒径偏小,且雾化颗粒密度大,粒径主要分布在小于200μm范围;XTG团聚液气泡粒径偏大,CMC团聚液气泡粒径介于两者之间;0.2%CMC团聚液气泡粒径均匀,颗粒数量大;在距喷口轴向20cm处,气泡破碎和聚合趋于稳定;喷口直径0.5mm时,气泡雾化粒径大多分布在100-300μm粒径范围内,符合团聚脱除PM2.5的气泡条件;随着温度的升高,直径在0-300μm内的气泡颗粒数量增大明显。

Reunion foam is an effective method for removal of fine particulate matter of PM2.5. The particle sizes of the reunion liquid when atomize were studied to choose the suitable bubble size and spray conditions for the aggregation of PM2.5 solution. The foam bubble size and aggregate amount of particulate matter were estimated according to the formulas. By CCD,the finely atomized liquid foam movement from nozzles was recorded. To calculate the atomization bubble size and distribution,MATLAB was used for the image processing. Results showed that the atomized foaming agent could promote the liquid to form bubbles and increase the diameter of the atomized particles. The bubble size of PAM reunion liquid was small,and the atomized particle density was big,the mainly particle size was less than 200μm,while the XTG bubble size was large,and the CMC bubble size was in between. The 0.2% CMC liquid gave the uniform bubble size,and larger number of particles. At a distance of 20 cm at the axial spout,the bubble crushing and aggregation were stabilized. When the spout diameter is 0.5mm,the mostly bubble particle sizes are in the range of 100 to 300μm,suitable to the bubble conditions for removal of PM2.5. As the solution temperature increases,the number of atomized bubble particles of 0 to 300μm is increased significantly.