滚筒烘丝机内烟丝滞留时间模型的建立及数值模拟

摘要

For deeply studying the drying process inside a cylinder dryer and promoting cigarette quality, a model for the residence time of cut tobacco in a cylinder dryer was established by analyzing the movement process of cut tobacco inside a cylinder. The variations of theoretical model along with the changes of technical parameters were analyzed via numerical simulation. The results showed that: the residence time of cut tobacco decreased with the increase of rotational speed, radius and inclination angle of cylinder, slightly reduced with the increase of air velocity inside cylinder, and positively proportioned to cylinder length. Technical parameters in the order of their influences on cut tobacco’s residence time were inclination angle > radius > rotational speed > cylinder length > air velocity. Experiments were carried out to validate the relationship between cylinder rotational speed and cut tobacco residence time, the results well agreed with the results of numerical simulation. The model can predict the residence time of cut tobacco in a cylinder dryer accurately and is helpful to process control of cut tobacco drying and the improvement of processing quality.%为深入研究滚筒烘丝机内部加工过程，提升卷烟产品品质，通过对烟丝在滚筒烘丝机内的运动过程进行分析，建立了滚筒烘丝机内烟丝滞留时间模型，并通过数值模拟分析了理论模型随各工艺参数的变化规律。结果表明：烟丝滞留时间随着滚筒转速、半径和倾角的增大而减小；与滚筒烘丝机的长度成正比关系；随着滚筒内介质风速的增大略有减小。各工艺参数对烟丝滞留时间的影响大小依次为倾角＞半径＞转速＞长度＞风速。通过试验验证了滚筒转速与烟丝滞留时间的变化规律，试验结果与数值模拟结果具有较好的一致性。该模型能够准确预测滚筒烘丝机内烟丝滞留时间，有助于加强烘丝过程控制，提高制丝加工品质。