添加剂对烤烟烟气焦油和CO释放量的影响

Effects of Additives on Release of Tar and CO in Flue Gas from Combustion of Flue-cured Tobacco

在烤烟样品中添加KNO3和KClO3添加剂,采用烟支抽吸测试,结合热重-微分热重-差示扫描量热法联用热分析技术分析添加剂对烤烟燃烧污染物（焦油和CO）释放和烟丝样品热解燃烧的影响,研究烤烟燃烧污染物释放的反应阶段与其燃烧动力学的关系.结果表明,KNO3和KClO3均能不同程度降低烤烟的抽吸口数、CO释放量及焦油量.KNO3比KClO3更显著地降低烤烟样品在大分子挥发分热解燃烧阶段（504.15~696.15 K）的活化能,促进该阶段的反应,降焦效果明显;而KClO3对烤烟残炭燃烧阶段（696.15~852.15 K）的促进效果略低于KNO3,但其在烤烟小分子挥发物热解挥发阶段（407.15~504.15 K）的促进作用非常明显,两个阶段的综合效果优于KNO3,降低烤烟CO释放量的作用更明显.同时还研究了添加剂对烤烟燃烧各阶段的反应动力学及反应机理的影响.

In order to fred out the relationship between release stage of combustion pollutants such as tar and CO and its combustion kinetics for flue-cured tobacco, the method of cigarette suction combined with TG-DTG-DSC thermal analysis technology was applied to analyze the effects of KNOa and KC103 additives on combustion pollutants release and decomposition of flue-cured tobacco. The results show that both additives can reduce puff number, and release of CO and tar in different degrees. KNO3 has more obvious effect in reducing tar during flue-cured tobacco combustion than KC103 due to the reduction of activation energy in the macromolecular volatile pyrolysis and combustion stage （504.15~696.15 K）, and promotes this stage reaction. Although the promoting effect of KC103 in carbon residue combustion stage （696.15~852.15 K） is slightly lower than that of KNO3, its promoting effect is remarkable in the pyrolysis volatilization stage of small molecule volatiles （407.15~504.15 K）. Considering the comprehensive effect in the above two stages, reducing the release of CO with KCIO3 is more obvious than that with KNO3. Moreover, the effects of additives on the reaction kinetics and reaction mechanism in different decomposition stages of flue-cured tobacco combustion are also studied.