Study On Separation Performance Of Tobacco Dust In Situ Separation Device-Vortex Tube Separator

Tobacco dust is easy to be produced in the process of operation of leaf beating and rebaking,tobacco preparation,smoke rewinding and other processes.At the same time,it will also be produced in the process of material handling and transportation.The accumulation of dust in the air could be raised and resulted in secondary dust pollution.Long-term inhalation of high concentrations of dust may cause pulmonary fibrosis as a systemic disease,that is,pneumoconiosis.In addition,tobacco dust also has a nature of combustible and explosive,Some data suggest that tobacco dust is more dangerous than flax and grain dust.The dust explosion is produced in an instant and accompanied by high temperature and high pressure.The shock wave formed by the expansion of hot air has great destructive force and destruction.Therefore,it is necessary to separate the dusty air in situ.In-situ separation means in-situ emissions,which requires a separation and purification device with high separation efficiency to meet the technical specifications of in-situ emissions.Aiming at the more serious working environment of dust-bearing airpollution in the working environment of tobacco production,this paper puts forward the use of military products-vortex tubes for the treatment of tobacco dust,the results are also applicable to other dust environments.Back to someone oil with other industries.The specific research contents are as follows:Numerical simulation of the influence of structural parameters on the performance of Vortex tubes.Firstly,the orthogonal test is arranged by several important structural parameters which affect the performance of the vortex tube,the orthogonal table is used to arrange the combination of different structural parameters,and different vortex tube models are established,and the influence of the pitch,shaft diameter,vertical distance of the diffuser and the bottom of the blade on the performance of the vortex tube is comprehensively investigated by numerical simulation.Optimal design of vortex tube.According to the results of numerical simulation of orthogonal test,considering the best match of resistance and efficiency,a set of structural parameter combinations which meet certain requirements,have small resistance coefficient and relatively high separation efficiency are optimized to optimize the structure of the vortex tube.Numerical simulation of the optimized vortex tube model is carried out to study its separation performance under different working conditions.The Resistance and grading efficiency characteristic curves of the optimized vortex tube are obtained by numerical simulation.Design of vortex tube separator.Based on the optimization model,carries on the reasonable circumferential design layout to the 42 Vortex tube Unit,designs the gas quantity treatment quantity,the pressure loss is small,the separation efficiency is high,the layout is reasonable,the structure is compact,applies to the air-solid separation device installed in the wind pipe.The working performance of the separator is numerically simulated,and the flow field state of the vortex tubes in each unit is studied.Experimental study on vortex tube separator.The separator was made,and the total pressure loss and separation efficiency under different mainstream flow are studied on basis of numerical simulation,the separation efficiency and the variation law of total pressure loss with Bypass Ratio are also studied.Compared with the numerical simulation results,the accuracy of numerical simulation is verified.The results show that for the vortex tube model designed in this paper,the vertical distance between the diffuser and the bottom of the blade has the greatest influence on the resistance,followed by the shaft diameter and the pitch.The shaft diameter has the greatest influence on the efficiency,followed by the pitch,and the vertical distance between the diffuser and the bottom of the blade has the least effect on the efficiency.With the increase of inlet velocity,the resistance and efficiency of vortex tube are increasing,but the amplitude of the increase in efficiency is slowand the resistance increases in quadratic curve.The experimental results show that the resistance characteristics and separation efficiency of vortex tube separator are within error of 10% compared with numerical simulation,the separation efficiency is more than 98%,and the change trend is consistent with numerical simulation.Which verify the rationality and effectiveness of numerical simulation and layout.And lays a foundation for the study of the performance of axial flow guide vane cyclone separator in the future,provides a new set of ideas for the optimal design of cyclone separator.By comparison,the total pressure loss of the vortex tube separator designed in this paper is relatively small.And the resistance can be reduced by 23% under the same mainstream flow.The segmented particle size is up to 3μm.Compared with cyclone separator,it has better separation characteristics.