烟草科技2016，Vol.49Issue(3)：84-90,7.DOI:10.16135/j.issn1002-0861.20160312
滚筒复烤方式下片烟的尺寸分布变化特征
Variations of size distribution of tobacco strips redried by a cylinder dryer
摘要
Abstract
To study the variation of size distribution of tobacco strips redried by a cylinder dryer, the effects of operational conditions including cylinder wall temperature, hot air temperature, cylinder’s rotational speed and material/cylinder volume ratio on the size distribution of redried strips were investigated, and the variation of size distribution of tobacco strips redried by hot air system was analyzed and compared. The results showed that: 1) The variation coefficient of moisture content in strips was less than 2% and the moisture content in strips was uniform at large during the whole process of cylinder redrying. 2) Cylinder wall temperature influenced the redrying time, drying rate and redried strips’temperature significantly (P<0.05); volume ratio affected redrying time and drying rate of strips greatly (P=0.004 7); while the hot air temperature and cylinder’ s rotational speed did not affect redrying time, drying rate and redried strips’temperature significantly (P>0.05). 3) After cylinder redrying, the percentage of large size strips decreased, that of middle and small size strips increased; the characteristic area of strips reduced, while uniformity coefficient raised. In general, the percentage of large and middle size strips was higher and shrinkage rate was lower at the conditions of cylinder wall temperature 70 ℃, hot air temperature 80 ℃-90 ℃, cylinder’s rotational speed 8 r/min and volume ratio 16.16%. 4) Comparing with hot air redrying, the shrinkage rate of strips was obviously lower and the percentage of large and middle size strips was higher under cylinder redrying at the similar drying rate.关键词
片烟/滚筒复烤/热风复烤/尺寸分布/收缩率Key words
Tobacco strip/Cylinder redrying/Hot air redrying/Size distribution/Shrinkage rate分类
轻工业引用本文复制引用
刘楷丽,王晓娟,陈良元,韩李锋,王岩,常纪恒,朱文魁..滚筒复烤方式下片烟的尺寸分布变化特征[J].烟草科技,2016,49(3):84-90,7.基金项目
国家自然科学基金项目“植物多孔介质快速干燥过程微细结构变化的分形特征及对热质传递影响机制”（51306213）。 （）
