Dynamic Analysis Of Dust In The Pneumatic Conveying System Of The Secondary Dust Centralized Treatment In Textile Mills

The centralized recovery of secondary dust in the textile mills can effectively reduce secondary pollution in textile workshops.Further research on the secondary dust pneumatic recovery system has important theoretical research value and engineering significance.However,there is no publicly published literature to study this.To this end,this paper conducts in-depth experimental research and theoretical analysis on the pneumatic conveying of secondary dust in a textile mill.This paper first summarizes the theoretical research and numerical research work of pneumatic conveying,and provides reference for the pneumatic conveying research of secondary dust centralized treatment in textile mills.Then the physical characteristics of the secondary dust in the dust removal unit of the textile mill were studied.The main physical characteristics of secondary dust in textile mills were determined through experiments: bulk density,true density,repose angle,particle size and particle size distribution.Based on the experimental results of the physical characteristics of the secondary dust,a set of pneumatic conveying system experimental platform suitable for the secondary dust collection of the dust removal unit of the textile factory was designed,which can achieve the intermediate phase transportation.According to the results of the experimental design,the mathematical dust theory is used to analyze the flow and resistance characteristics of the textile dust in the pneumatic conveying experiment,so as to provide basic parameters for engineering design.The pneumatic conveying experiment platform is used to set horizontal straight pipe sections,inclined straight pipe sections and vertical straight pipe sections.U-type pressure gauges are used to obtain the pressure loss and system loss of each pipe section of the pneumatic conveying system.At the same time,the effects of conveying gas velocity,material flow rate and material-gas ratio on the energy consumption of each straight pipe section were analyzed in depth.From the experimental results,it can be concluded that in the same pneumatic conveying system,the optimal air velocity delivered by each pipe section is unique and has nothing to do with the mass flow of the conveyed material.At the same time,the optimal air velocity of the experimental system is 10.17 m / s.The best material-gas ratio can be obtained from the ratio of the best conveying gas velocity to the mass flow rate of the material.It can be seen that in the same conveying system,theoptimal gas velocity under different conveying conditions does not change,but it affects the corresponding Optimum material-gas ratio.Based on Barth's additional pressure drop theory,combined with dimensionless analysis,and using Eviews 8.0 software to analyze and fit a large number of experimental data,the additional pressure drop coefficients and pressure drop formulas for horizontal pipe sections,inclined pipe sections,and vertical pipe sections are obtained.The calculated value calculated by the pressure drop formula is in good agreement with the experimental values.The error of the horizontal pipe section is less than 9.2%,the error of the inclined pipe section is less than 10%,and the error of the vertical pipe section is less than 9%.