Experimental study on atomization dust removal based on chemical wetting
In view of the problems of nozzle clogging,large water consumption,uneven droplet size,and high energy consumption in the traditional wet atomization dust removal process,it was necessary to study the atomization characteristics of the dual-media nozzle used and its dust removal efficiency.The atomization dust removal method based on chemical wetting was studied,and the effects of wetting agent type,nozzle outlet structure,gas-liquid ratio and other factors on the removal efficiency of fine particles in converter flue gas in steel production process were analyzed.Firstly,the principle of wetting agent and the mechanism of water mist dust removal were analyzed.The effects of nozzle structure,gas-liquid ratio,and atomizing medium on atomization characteristics were experimentally studied.It was found that adding anionic wetting agents sodium dodecyl sulfate(SDS)and sodium dodecyl benzene sulfonate(SDBS),nonionic wetting agents Trayton(TX-100),and Tween 20(TW-20)in water can reduce the surface tension of the solution,of which SDS solution has the best wettability.With the increase of the wetting agent concentration,the SDS solution better reduced the surface tension of the solution and enhanced the primary atomization.During the atomization process,the dust reduction rate of the cone nozzle on PM10 can reach 41.91%.The droplet diameter gradually decreased as the gas-liquid pressure ratio increased,the droplet size of porous structure nozzle was smaller and more uniform compared with cone and sector nozzles.When the gas-liquid pressure ratio was 1.25,the atomization droplet SMD(Sauter Mean Diameter)of 0.05wt%SDS solution can reach 64.53 μm.The dust reduction rates of PM2.5 and PM10 can reach 74.28%and 76.41%.The research results can provide basic support for the pre-treatment and efficient dust removal technology of fine dust in traditional heavy industry such as steel,power,and building materials,and are of great significance for the efficient removal of PM2.5 and PM10.