香烟燃烧产生的亚微米颗粒物动态粒径谱特征

DYNAMIC CHARACTERISTIC OF THE SIZE SPECTRUM OF SUBMICRON PARTICLES FROM CIGARETTE COMBUSTION

应用SMPS(Scanning Mobility Particle Sizer)对ETS(Environmental Tobacco Smoke)亚微米颗粒物的粒径谱演变进行了测量分析。结果发现,ETS颗粒物在10～500 nm范围内呈对数正态单峰分布,数量粒径谱和质量粒径谱的演化有类似的递减趋势,但其浓度衰减率有明显的不同。分析得知,由于在演化过程中颗粒物直径是动态变化的,并不能用简单的方法获得凝并和沉积损失率。

The size spectrum of ETS submicron particles was measured with SMPS （Scanning Mobility Particle Sizer）. The results indicated, within the size range of 10～500 nm, the ETS particles are lognormally distributed with one peak. The number and mass size spectra tended to decrease during the evolution time, but with different decay rates. It is shown that the coagulation or deposition loss rate can＇t be got with simple ways, since the particle diameter is changing dynamically.