Experimental study on promotion of fine particles capture with wetting agents
The interaction of fine particles from oil combustion with water droplets was studied in a flow chamber experimentally.A novel fine particle capture technique with wetting agents was developed to investigate particle number concentration and size distribution before and after the interaction.The characteristics of particle capture with different wetting agents were also evaluated.The particle size distribution and concentration were measured by electrical low pressure impactor(ELPI).The dependence of fine particles capture mechanism on microstructure and elemental compositions was analyzed with SEM and EDS.The results showed that the capture efficiency appeared to be closely related to the physico-chemical properties of fine particles.The SEM and EDS analysis showed that particles from oil combustion were basically spherical,carbon-containing hydrophobic particles.And the capture efficiency of fine particles with plain water droplets was low,but could be enhanced with wetting agents added to the atomized droplets.The capture efficiency could increase by 15% with adding Silanol w22 against plain water droplets.The investigation could be used to test and choose different wetting agents for fine particles capture.