梗签二次分离装置悬浮腔体内的负压分析
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摘要
在卷烟生产中,通过梗签二次分离再回收烟丝一直是烟草企业提高烟丝利用率减少浪费以获取更大经济效益的有效途径。现有的梗签剔除工艺主要是通过风选的方式实现,但风量的大小往往都是根据经验选择,缺乏相应的理论支撑。首先通过力学计算从理论上得到能够满足风选要求的负压范围,然后利用软件仿真对梗签二次分离装置中悬浮腔体内梗签和烟丝颗粒的运动状态进行分析,验证理论负压范围的科学性;最后通过试验分别统计梗签的剔除率和烟丝的回收率,进一步验证理论负压范围和仿真分析的有效性。其结果表明:当负压在-180kPa～-220kPa的范围内时,腔体内的气流状态和气流速度分布较为均匀,颗粒间的碰撞较少;同时,梗签剔除率为90%以上。
In the production of cigarettes,it is always an effective way for tobacco enterprises to improve the utilization rate of tobacco and reduce waste in order to obtain greater economic benefits through secondary separation of stalks and sticks.The existing stemstick removal process is mainly achieved by air selection,but the size of air flow is often based on experience,lacking the corresponding theoretical support.Firstly,the range of negative pressure which can meet the requirements of air separation is obtained theoretically by mechanical calculation.Then,the movement state of the stem and tobacco particles in the suspension chamber of the secondary separation device of the stem is analyzed by software simulation analysis to verify the scientificity of the range of theoretical negative pressure.Finally,the rejection of the stem is counted separately through experiments.The removal rate and the recovery rate of the cut tobacco were further verified and verified the theoretical negative pressure range and the validity of the simulation analysis.The results show that when the negative pressure is in the range of-180 kPa～-220 kPa,the air flow state and velocity distribution in the chamber are more uniform,and the collision between particles is less;at the same time,the removal rate of stem sticks can reach more than 90%.
In the production of cigarettes,it is always an effective way for tobacco enterprises to improve the utilization rate of tobacco and reduce waste in order to obtain greater economic benefits through secondary separation of stalks and sticks.The existing stemstick removal process is mainly achieved by air selection,but the size of air flow is often based on experience,lacking the corresponding theoretical support.Firstly,the range of negative pressure which can meet the requirements of air separation is obtained theoretically by mechanical calculation.Then,the movement state of the stem and tobacco particles in the suspension chamber of the secondary separation device of the stem is analyzed by software simulation analysis to verify the scientificity of the range of theoretical negative pressure.Finally,the rejection of the stem is counted separately through experiments.The removal rate and the recovery rate of the cut tobacco were further verified and verified the theoretical negative pressure range and the validity of the simulation analysis.The results show that when the negative pressure is in the range of-180 kPa～-220 kPa,the air flow state and velocity distribution in the chamber are more uniform,and the collision between particles is less;at the same time,the removal rate of stem sticks can reach more than 90%.
引文
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[3]武小松,张伟,疏谦,等.烟梗除轻杂风选箱体的改进[J].科技创新报,2012(12):16-17.
[4]柏世绣,付保,张东甫.ZJ17卷接机组二次风选漂浮室的改进[J].烟草科技,2012(8):26-28.
[5]林朝辉.ZJ17卷接机组新型二次风选装置的改进[J].机械工程师,2015(8):236-237.
[6]Tomita Y,Agarwal V K,Asou H,et al.Low-velocity pneumatic conveying in horizontal pipe for coarse particles and fine powders[J].Particuology,2008,6(5):316-321.
[7]金光明,王胜枝,杨剑锋,等.一种卷烟机梗签分离装置[P].中国专利:CN206390289U,2017-08-11.
[8]郑新虎.梗签分离装置中气流的流动分析及仿真研究型[D].昆明:昆明理工大学,2018.Zheng Xinghu.Flow analysis and simulation of air flow in a stems separation unit[D].Kunming:Kunming University of Science and Technology,2018.
[9]Rabinovich E,Kalman H.Generalized master curve for threshold superficial velocities in particle-fluid systems[J].Powder Technology,2008,183(2):304-313.
[10]江威,张国智,卢浥良.一种烟丝、烟梗分离测试仪[P].中国专利:CN105424535A,2016-03-23.
[11]Hoppe F,Breuer M.A deterministic and viable coalescence model for Euler-Lagrange simulations of turbulent microbubble-laden flows[J].International Journal of Multiphase Flow,2018,99:213-230.
[12]吕子剑,曹文仲,刘今,等.不同粒径固体颗粒的悬浮速度计算及测试[J].化学工程,1997(5):44-48,6.LǜZijian,Cao Wenzhong,Liu Jin,et al.Research of suspension of particle in reactor[J].Chemical Engineering,1997(5):44-48,6.
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[14]张皓天,李浙昆,蔡培良,等.外置式卷接机组梗签分离装置的设计[J].烟草科技,2018,51(10):97-103.Zhang Haotian,Li Zhekun,Cai Peiliang,et al.Design of standalone sliver separating device for cigarette maker[J].Tobacco Science&Technology,2018,51(10):97-103.
[15]于勇.FLUENT入门与进阶教程[M].北京:北京理工大学出版社,2008.