Abstract
Tobacco drying is an important part in the whole process of cigarette production, and its quality is directly related to the quality of cigarettes. CTD (Comas Tower Dryer) is a new type of airflow dryer, which is widely used in the tobacco industry because of its high drying efficiency. In actual production, the uneven outlet of the tobacco cutter leads to a stacking phenomenon, which affects the subsequent process of production. In this paper, the distribution of the internal flow field of the drying tower was studied from the aspects of the overlap degree of the orifice plate and deformation of the top structure at the top of the drying tower to explore the way to optimize the inner flow field to lead to the uneven distribution of the outlet. The results show that the structure whose contact position between the wall and the outlet extending outward can improve the uniformity of the outlet, while the overlap degree of the orifice plate had no effect on the uniformity of the outlet.
Highlights
The tobacco industry has become one of the important pillar industries in China in recent years
If the air velocity distribution was significantly different after passing through the orifice plate, the nonuniformity still produces only the velocity gradient in the same section which is reduced after the fusion, which is beneficial to the drying process
From the perspective of maximum and average velocity of the tobacco cutter outlet section, the OPS1 orifice plate structure has the worst performance in uniformity, while OPS4 and OPS5 have better performance
Summary
The tobacco industry has become one of the important pillar industries in China in recent years. Chin et al (Chin and Law, 2014) used a two-stage drying method to dry the Ganoderma lucidum, and the results showed that compared with single-stage drying, this method had a shorter time and higher drying efficiency in the whole It can be seen from the literature that it optimizes the drying process with the process parameters and process control methods to provide a certain guidance and theoretical basis to study the uniformity of the tobacco cutter outlet. The reason is that most of the drying towers used in the tobacco industry are directly introduced from the manufactures, while if changing the structure one may meet unexpected difficulties such as the production stoppage It will cost labor and material resources if it turns out during the experiments that the structural optimization is not necessarily suitable for the dryer towers. The change of the flow field is analyzed by modifying the top structure of the drying tower
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