Experimental Study On Capture For Aerosol With The Mini-cyclone

The aerosol prevention and treatment is the hot issue in the field of energy and environment but with many difficulties. No economical equipments are available for aerosol capturing in engineering practice up to now. It is designed in this article 5 types of mini-cyclones for aerosol capturing with different nominal diameters. A set of equipments with Phase Doppler Particle Analyzer (PDPA) for cold model experiments is established and the influence of the structural and operational parameters on the pressure drop and separation efficiency is studied. The main work in this research is listed as following:(1) The enhanced separation with air leak is found in gas-liquid cyclonic separation and the enhancement process with air leak is invented and the equipment based on this process is established. The pressure drop of three mini-cyclones (DN100, DN150 and DN200) increase slightly with air leak, while that of the DN75 mini-cyclone decreases due to the decreased energy consumption of turbulence in the dipleg, meanwhile the maximum separation efficiency increase from 95% up to 98% and the correspondent split ratio to the highest efficiency is 10%.(2) Compared with four mini-cyclones (DN25, DN100, DN150 and DN200), the separation efficiency of the DN75 mini-cyclone reaches to a higher level. The liquid concentration of outlet gas is only 25mg/m3 when the air volume is 40m3/h, the liquid concentration is 0.5g/m3 and the average droplet size is 7μm, superior to National Standard GB13223-2003.(3) The extreme pressure drop of four mini-cyclones (DN75, DN100, DN150 and DN200) is 32mmH2O,25mmH2O,20mmH2O,34mmH2O respectively, only 1/5～1/3 of that of conventional cyclone, while the inlet air velocity of them is all for 8.4m/s. In this paper, a brand-new model for pressure prediction is also established.