不同加热温度加热卷烟抽吸过程中烟芯段气溶胶的动态分布

Dynamic distribution of aerosol inside tobacco section of a heated tobacco product during smoking at different heating temperatures

为研究加热温度对加热卷烟烟芯段气溶胶动态分布的影响,将加热卷烟样品与不同加热温度的同一加热器具配套使用,采用气溶胶原位表征系统对加热卷烟烟芯段各测试点的气溶胶进行原位取样和在线测试,考察了300、330和360℃3个加热温度条件下加热卷烟抽吸过程中烟芯段气溶胶主要物理特性的动态分布;进一步采用热电偶法对不同加热温度加热卷烟烟芯段的温度场进行表征,阐明温度分布对气溶胶分布的影响。结果表明:①不同加热温度条件下,烟芯段释放至空腔段的气溶胶粒径均呈现近似正态对数分布,随加热温度的升高,气溶胶的粒径和粒数浓度均增大。②不同加热温度条件下,烟芯段气溶胶的粒数中值粒径、粒数浓度和体积浓度均呈现相似的分布趋势,较大的粒数中值粒径、较高的粒数浓度和体积浓度主要分布于靠近加热片的中前段。③随加热温度的升高,烟芯段气溶胶的较大粒数中值粒径、较高粒数浓度和体积浓度分布区域呈明显的增加趋势。④加热卷烟烟芯段的温度分布与气溶胶分布直接相关,高温区域由于高浓度蒸汽成分的存在而有利于气溶胶的形成。

To study the effect of heating temperature on the dynamic distribution of aerosol from the tobacco section of heated tobacco products,heated tobacco product samples were smoked with the same matched heating apparatus at different heating temperatures.An in-situ aerosol characterization system was used for sampling and on-line detection of aerosol from each detection point in the tobacco section.The dynamic distributions of the main aerosol physical properties formed at 300,330,and 360℃heating temperatures were investigated during smoking.Furthermore,the temperature fields inside the tobacco section heated at different heating temperatures were characterized by thermocouples to clarify the influence of temperature distribution on aerosol distribution.The results showed that:1)The particle size of aerosol released from the tobacco section to the cavity section at the three heating temperatures showed approximately normal logarithmic distribution.The particle size and particle number concentration of the aerosol increased with increasing heating temperature.2)The distributions of count median diameter,particle number concentration,and volume concentration were basically the same at the different heating temperatures.The aerosol with larger count median diameter and higher number concentration and volume concentration was mainly distributed in the middle and front sections near the heating element.3)The distribution area of larger count median diameter and higher particle number concentration and volume concentration in the tobacco section increased significantly with the increase of heating temperature.4)The temperature distribution in the tobacco section of the heated tobacco product directly correlated with the aerosol distribution.The higher temperature was conducive to aerosol formation due to the presence of high-concentration vapor components.