不同烟叶热失重特性及燃烧特性分析

Characteristics analysis ofdifferent tobacco thermogravimetric and combustion

为考察烟叶原料加热状态下的热失重及燃烧特性,采用热失重分析（TG）和差示扫描量热分析（DSC）技术分析了不同类型、不同部位和不同产地烟叶原料的热失重特性和燃烧特性。结果表明：1提高升温速率不改变烟叶的热失重特性,但可加快烟叶的质量损失,有利于烟气的快速释放;2烤烟、白肋烟和香料烟的热失重特性具有明显差异,烤烟和香料烟存在4个热失重阶段,白肋烟只存在3个热失重阶段,其中烤烟和香料烟产生烟气和香味物质主要在第2和第3热失重阶段,白肋烟主要在第2热失重阶段,并且烤烟和香料烟相应的失重率高于白肋烟;3各烟叶均存在挥发物燃烧阶段（200～400℃）和炭化物燃烧阶段（400～600℃）,并分别对应于各烟叶的后两个失重阶段;4烤烟两个燃烧阶段的着火温度分别在250～280℃和420～460℃之间,白肋烟和香料烟均分别在230～240℃和410～420℃之间。

In order to investigate smoke releasing characteristics of tobacco,thermogravimetric and combustion characteristics of to-baccos with different types,stalk parts,planting areas were analyzed by TG and DSC. The results indicated that thermogravimetric characteristics of tobaccos didn,t change with the increasing of heating rate, but their weight loss would be accelerated. Thermo-gravimetric characteristics of flue-cured tobacco was remarkably different from that of burley tobacco and oriental tobacco. There were four weight loss stages for flue-cured tobacco and oriental tobacco,and three weight loss stages for burley tobacco. Flue-cured tobacco and oriental tobacco released smoke and aroma components by heating mainly in the second and third stage, and in the sec-ond stage for burley tobacco. The corresponding weight loss rate of Flue-cured tobacco and oriental tobacco was higher than that of for burley tobacco. There were two combustion stages when tobacco were heated. The first stage between 200 ？400 t was attribute to combustion of volatile components, and the second stage between 400 ～600 t was attribute to combustion of carbonizationproduct. The two combustion stages corresponded the last two weight loss stages of tobacco. Ignition temperatures of the two combus-tion stages for flue-cured tobacco were between 250 ～280 ℃ ,420 ～460 ℃ , respectively, and 230 ～240 ℃ ,410 ～420 ℃ for burley tobacco and oriental tobacco.