加热状态下烟草气溶胶释放特性的影响因素:温度、甘油和气氛

Factors influencing aerosol release characteristics of tobacco heated at low temperature:temperature,glycerol and atmosphere

为揭示加热状态下烟草热解气溶胶释放特性的影响因素,基于稳态热解装置与烟密度计联用系统,研究了温度、甘油含量(质量分数)、烟草种类、一级进气对烟草气溶胶释放量和发烟起始时间的影响,并利用稳态热解装置与撞击采样器联用系统,分析了甘油对烟草气溶胶粒径分布的影响。结果表明:(1)随甘油含量增加,烟草发烟起始时间线性降低,气溶胶释放量线性增加,且气溶胶粒径分布变宽。(2)不含甘油时,降低温度、增加一级进气流量均可使烟草气溶胶释放量增加;加入甘油后,增加一级进气流量可更加有效地提高烟草气溶胶释放量,但气溶胶释放量随温度升高先增大后降低;过高的温度(500℃)会导致烟草发生燃烧,甘油对此有明显的加剧效应。(3)升高温度、增加甘油含量可以有效缩短气溶胶释放的响应时间,并且甘油使气溶胶释放时间具有更高的温度敏感性。(4)不同烟草原料因具有不同的理化特性,导致其气溶胶释放量和发烟起始时间存在一定差异。

In order to reveal the key factors influencing the aerosol release characteristics of tobacco heated at low temperatures,the effects of temperature,glycerol content,tobacco type and primary air supply on the aerosol yield and starting time were investigated using a test system combining a steady-state tube furnace withan aerosol density gauge. In addition,a combination of the steady-state tube furnace with a cascade impactor was chosen to evaluate the role of glycerol in aerosol size distribution. The results showed that：1） With the increase of glycerol content in tobacco,there was a linear reduction in the aerosol starting time,and the aerosol yield displayed a linear increase with a broader aerosol particle size distribution. 2）Aerosol yield was raised for glycerol-free tobacco when temperature was lowered or primary air supply increased. For glycerolcontaining tobacco,the increase of primary air supply effectively increased aerosol release,however,this trend increased firstly and then decreased with the rise of temperature. A high heating temperature（500 ℃） resulted in tobacco combustion and glycerol had a significant synergistic effect. 3）Both the rise of temperature and the increase of glycerol content effectively reduced the response time of aerosol release,and glycerol promoted the temperature sensitivity of the response time of aerosol release. 4） The physicochemical characteristics of different type tobaccos differed,which resulted in the differences of aerosol yield and aerosol starting time.