Study On Performance Of Compound Surfactant Combined With Wet Fiber Grating Capturing Pulverized Coal

At present,there will be leakage and diffusion of pulverized coal in the process of in the process of coal mining,which will not only pollute the environment,but also cause explosions.At present,spray dust removal is widely used in China to treat pulverized coal.However,the removal of pulverized coal only by water spray device cannot achieve the desired dust removal effect.In this paper,a new type of dust removal device is designed by theoretical analysis,gas-liquid two-phase numerical simulation and experimental research,so as to improve the efficiency of spray dust reduction and provide reference for the prevention and control of pulverized coal.Based on the spray dust removal mechanism,surfactant dust removal mechanism and wet fiber grating dust removal mechanism,the important factors affecting the dust removal efficiency were analyzed,and the performance of several dust removal mechanisms in capturing anthracite powder under synergistic effect was studied.Based on the fluid dynamics theory,the model is established and meshed by Fluent software to simulate the influence of different spray pressure and atomization angle on droplet movement and the influence of fiber spacing on droplet interception effect.The simulation results show that the atomization effect is better when the atomization pressure is 8 MPa.When the atomization angle is 80°,the atomization area is large and the droplet distribution is relatively uniform;when the fiber spacing is 1 mm,the fiber grating has a stronger blocking effect on the droplets,and the droplets are easy to form water film on the surface of the fiber network,and the dispersion area is large,which is more favorable for dust capture.Based on the results of numerical simulation,the nozzle with atomization angle of 80° was selected for the spray device,and the good characteristics of surfactant dust removal and wet filter dust removal were effectively combined to construct a new type of surfactant wet filter dust removal equipment.Under the premise of ensuring the working performance of the dust collector,the effects of surfactant ratio,mesh number of fiber grating,spray pressure,wind speed inside the box and other parameters on dust removal efficiency were studied.The experimental results show that compared with the single fiber grid dust removal system,the dust removal device after adding spray and surfactant has significantly improved the capture efficiency of pulverized coal.Among them,the increase of spray pressure and wind speed inside the box makes the dust removal efficiency increases,and the addition of surfactant makes the dust removal efficiency has a significant improvement compared with pure water spray.It can be concluded that the surfactant can effectively improve the effect of spray on pulverized coal capture.By comparing the effects of three kinds of compound surfactants on dust removal efficiency,it was found that the dust removal efficiency of LAB-35 + X-100 compound solution was the highest,reaching 97.03 %when the spray pressure was 8 MPa.Compared with the single fiber grating,the dust removal efficiency of the system increased by 12.46 % after adding surfactant.The comparison between numerical simulation and experimental research shows that the spray pressure has a positive effect on the dust removal effect,and the results are consistent.This study can provide reference for the effective prevention and control of dust in industrial dust removal.