The impact of re-entrainment on the electrocyclone effectiveness

The object of study was the electrocyclone of 'pipe in pipe' type. Aluminosilicate fly ash from thermal power plant (TPP) was the test material. Study was carried out in dry and wet modes. Re-entrainment was observed in dry operation mode. No re-entrainment was observed in wet operation mode. The value of re-entrainment was calculated. It decreases collection efficiency from 99.9% to 60%. Re-entrainment depends on aerosol velocity (range 14-27 m/s) and the aerosol concentration (range 2-30 g/m3). It is shown, what re-entrainment can be eliminated by water irrigation of collecting electrodes.