不同烟丝含水率卷烟主流烟气气溶胶的粒径分布特征

  目的  烟丝含水率对烟气颗粒的影响。  方法  采用DMS500快速粒径谱仪和电子低压撞击器(ELPI), 在ISO抽吸模式下, 考察不同烟丝含水率卷烟烟气气溶胶的粒数粒径分布和质量粒径分布特征。  结果  ① 不同含水率(8.1%、12.6%和17.6%)卷烟烟气气溶胶的粒数粒径均在40~400 nm呈近似对数正态分布。随着含水率增加, 全部抽吸口数的烟气粒子平均数浓度无显著变化、体积浓度明显降低、粒数中值直径(CMD)和粒子体积中值直径(VMD)呈降低趋势。②3种含水率卷烟的烟气气溶胶质量主要集中在100~1000 nm, 随着含水率增加, 质量粒径分布向小粒径位移, 抽吸口数相同条件下捕集的气溶胶颗粒总质量降低。  结论  上述规律可为卷烟加工工艺参数的优化和卷烟产品开发提供参考。 

Particle size distribution of aerosols in mainstream smoke of cigarettes with different moisture content in cut tobacco

In order to study the effect of moisture content in cut tobacco on cigarette smoke particles, particle number size distribution and particle mass size distribution of smoke aerosol of cigarette with different moisture content were evaluated under ISO smoking regimes using a DMS500 fast particulate spectrometer and an electrical low-pressure impactor (ELPI), respectively. Results showed that 1) Particle number size distribution of smoke aerosol of cigarette with different moisture content (including 8.1, 12.6 and 17.6%) was within the range from 40 to 400 nm, which was basically a approximate lognormal distribution. With the increase of moisture content, the average particle number concentration in all puffs showed no significant difference, particle volume concentration significantly reduced, count median diameters (CMD) and volume median diameter (VMD) also showed a tendency to reduce. 2) The particle mass size distribution of smoke aerosols of cigarette with different moisture content was within the range from 100 to 1000 nm. With the increase of moisture content, the particle mass size distribution of smoke aerosols was shifted to a smaller particle size, and the total mass of the collected smoke aerosol particles under same puff number showed a decreasing trend. This study is of important significance to the optimization of cigarette processing parameters and cigarette development.