| Vortex tube separator is a device which uses the inertia force generated by blade guide to separate the gas-solid two-phase flow in rotating motion.The purified air enters the downstream device or discharges through the gas collecting port,and the solid particles enter the dust collection device.The vortex separator has the advantages of compact structure,high efficiency and good reliability,and is widely used in filtration device.The internal flow mechanism of the vortex separator is not described accurately because the blade forces the direction of the dustcontaining gas to change the direction of the movement,and the strong turbulence movement is produced.The interaction between the air and the solid particles is complex.Therefore,the research on the internal flow mechanism of the vortex separator has not been described accurately.Further research on the flow field characteristics and particle separation mechanism in the separator is still to be explored.Based on the numerical simulation and experiment,the flow field characteristics of the vortex tube separator are studied in detail.The comprehensive performance characteristics of the vortex tube separator are summarized comprehensively.The internal flow law and the gassolid separation mechanism of the cyclone are obtained.The results show that:(1)By proposing and constructing a new type of contraction collector scroll separator,four structural parameters of its spiral blade angle,the size of dust outlet,the length of blade rear end shaft and blade shaft diameter are analyzed.Based on this parameter,the internal structure is analyzed to judge the influence of parameters on aerodynamic performance.In the simulation process,the diameter of the dust outlet is analyzed.From the results,this parameter will have a great impact on the filtration characteristics and the overall pressure.The filtration performance is improved by 6%,and the pressure loss is increased by 188.76 pa.Other parameters such as the diameter of the vortex blade axis and the rotation angle of the blade are also analyzed,From the results,it does not have a great impact on the filtration characteristics and the overall pressure.(2)In the numerical simulation of shrink header vortex tube separator,the influence of solid particles on gas flow field is analyzed,and the influence of working parameters such as particle diameter,particle diameter,inlet pre swirl angle and scavenge pressure on the internal flow field of vortex tube separator is studied.The simulation results show that 38 ° pre rotation angle will increase the separation efficiency of particles by below 2 μm.Instead,the separation efficiency of particles with a diameter of 150 μm-500 μm will decrease;By reducing the scavenging pressure at the inlet of the outlet pipe,the separation efficiency of small diameter particles is improved,but the separation efficiency of larger diameter particles is almost not affected.(3)In this paper,a new vortex tube separator with rotating blades is proposed and designed.The pressure and velocity field distribution characteristics are studied by numerical simulation.At the same time,the effect of vortex blade speed on the movement of solid particles in dusty gas is analyzed.The results show that the highest separation efficiency is 98.9% when the rotating speed is 500 rpm,the outlet pressure is-5000 pa,the number of blades is 4 and the particle size is 0.01 mm;Among the four factors,the particle size,the number of blades,the outlet pressure and the blade speed are the most important factors.(4)The influence of particle humidity on the separation performance of the fixed vane vortex tube separator is considered for the first time.The influence of the moisture content of solid particles on the filtration characteristics of the vortex tube separator under different outlet pressure,ash content,particle diameter and scavenging pressure is studied experimentally.The moisture content of dust in the dusty gas has a great influence on the working conditions of the vortex tube separator.In the experiment,the dust moisture content of 1%,5% and 10% diameter is 4 μm、10 μm、38 μm The experimental results show that the higher the humidity is,the higher the separation efficiency is;In the experiment,38 μm Under the condition of 10%particle humidity,the separation efficiency of M-sized particles can reach 86.4%.(5)The performance experiment of fixed blade vortex tube separator was designed.The influence of outlet pressure,humidity,ash content and particle diameter on the separation efficiency of vortex tube separator was obtained by measuring different experimental operating conditions.When the blade rotation angle is 170 ° and the shaft length is 7.5 mm and the shaft diameter is 3.5 mm,the size of the dust hole is 1.5 mm,2 mm and 2.5 mm respectively.The separation efficiency of the same particle increases with the increase of dust outlet,ash content,particle humidity and scavenging pressure.The size of the dust outlet compares the numerical simulation and experimental results of the separation efficiency of the vortex tube separator.The trend is basically the same,and there are differences in the values,which shows that the numerical simulation results are reasonable.At the same time,due to the factors not considered in the simulation,the ideal data in the simulation deviates from the actual data. |
PDF Full Text Request