Study On Contact Behavior And Deposition Characteristics Of Micron Particles At Gas-liquid Interface

With plate scrubber as the research background,this paper focuses on the collecting and removing process of particles in dust-containing bubbles,and investigates the effects of particle surface physical properties,particle and gas-liquid interface impact velocity,particle mass concentration,and liquid properties on the deposition characteristics of micron particles at the gas-liquid interface.The main conclusions are as follows:The motion of hydrophilic particles impacting on the static gas-liquid interface was visualized by high speed camera.The results show that the impact results of particles on the interface can be divided into immersion and suspension.The critical impact velocity increases with the decrease of particle size and the existence of oil film.For immersed particles,the width of interface deformation before cavity generated is the same as the width of TPCL,which increases first and then decreases,and the immersion depth increases.After the formation of cavitation,the width of interface deformation increases,the width of TPCL becomes viscous and gradually decreases,and the rate of increase of immersion depth decreases.The immersion time of particles increases with the decrease of particle impact velocity,the decrease of particle size and the existence of oil film layer.The movement of micron particles with different wettability impinging on the gas-liquid interface was visualized by high speed camera.The results show that the cavity of hydrophilic particles is an inverted triangle,and the cavity of hydrophobic particles is an hourglass shape.The flowing gas-liquid interface accelerates the movement of the TPCL,strengthens the wetting ability of the liquid phase on the surface of particles,increases the stabilization time of suspended particles,reduces the immersion time of immersed particles,and reduces the critical impact velocity of particles,but has no promoting effect on the leaching of particles.The effects of particle impact velocity,particle concentration,liquid surface tension and particle surface properties on particle deposition efficiency at the gas-liquid interface were studied.The results show that for particles below 4.2μm,the increase of impact velocity,mass concentration,liquid surface tension,gas-liquid interface flow rate and the modification of soluble components on the surface of particles can obviously promote the deposition efficiency to 73%.For particles above 4.2μm,the deposition efficiency is more than 60%,the effect of the above conditions on the deposition efficiency is small.