烟草颗粒热解与释烟特性影响因素研究

目的]为探索加热状态下烟草颗粒热解和烟气释放规律.方法]采用导热系数测试仪、热分析仪(TGA)和锥形量热仪(CONE)表征分析了甘油添加量、水分含量以及粒径对烟草颗粒导热特性、热解过程和烟气释放特性的影响.结果](1)样品导热系数随水分和甘油含量的增加以及粒径减小整体上呈现不同程度的上升趋势,不同水分与甘油含量样...

Study on influential factors of pyrolysis and smoke release characteristics of tobacco particles

  Objective  This study aims to reveal the pyrolysis characteristics and smoke release law of tobacco particles under heating conditions.  Methods  The effects of glycerol content, moisture content, and particle size of tobacco particles on their thermal conductivity, pyrolysis, and smoke emission were investigated using thermal conductivity tester, thermal gravimetric analyzer (TGA) and cone calorimeter (CONE).  Results  (1) The thermal conductivity of samples presented an increasing trend, with the rising contents of glycerol and moisture and the decrease of particle sizes. The change trend of specific heat capacity of samples with different moisture and glycerol content was basically consistent with the thermal conductivity coefficient, and the specific heat capacity continued to decrease with the decrease of particle size. (2) The addition of glycerol dramatically increased the percentage of mass loss at low temperature range from 140℃ to 300℃), and made it become the major mass loss stage. The influence of moisture content on the mass loss rate of tobacco particles was weakened gradually with the rise of temperature. Moisture content mainly affected the emission of dissociative water, glycerol and small molecules under low temperature. The main mass loss process of samples slightly shifted to lowtemperature range with the decrease of tobacco particles sizes. (3) The increase of glycerol content (within 30%), decrease of water content and decrease of particle size were all beneficial to shortening the initial release time of tobacco smoke, accelerating the smoke produce rate, and raising the total smoke rate.