对流干燥对烟丝表面温度及理化特性的影响

摘要

Moisture content and temperature variation of cut tobacco during convective drying were detected with the different hot air temperature from 70 ℃ to 120 ℃.The heat and mass transfer model for the variation of cut tobacco surface temperature with moisture content was established,and the characteristic temperature was proposed to characterize the heating degree of cut tobacco in the drying process.Then the correlation between the physicochemical properties of cut tobacco and the characteristic temperature was analyzed after the end of drying (12.5％ moisture content of wet base).The results were present as follows:① Heat and mass transfer model ccould better reflect the surface temperature change of cut tobacco in the process of convection drying;② The relationship between characteristic temperature of cut tobacco and alkaline aroma constituents and acidic aroma components,aroma quantity,filling value of tobacco was very significant.While the total alkaloid,total sugar and reducing sugar had no significant relationship with the characteristic temperatures.%利用烟丝热风干燥装置,考察不同热风温度(70,80,90,100,110,120℃)下烟丝含水率、表面温度的变化规律,建立叶丝表面温度随含水率变化的传热传质模型,提出烟丝干燥过程中受热程度表征方法,并将干燥后(湿基含水率12.5％)烟丝理化特性的变化与烟丝的特征温度进行了相关性分析.结果表明:①建立的传热传质模型可以较好地反映对流干燥过程中烟丝表面温度随含水率的变化规律;②烟丝中碱性香味成分、酸性香味成分、香味总量、填充值与烟丝特征温度之间均达到了极显著关系,中性香味成分、氯元素的含量与特征温度之间达到了显著关系,试验范围内总植物碱、总糖、还原糖与特征温度之间关系不显著.