Abstract: In order to verify removal performance of superfine dust in the vertically quadrate wet electrostatic precipitation(WESP)， a WESP test system was set up in accordance with the practical engineering application requirements. In the experimental system， the influence of factors on the dust removing effect were tested such as the wind speed， the voltage between the electrodes， the electric field length and the dust concentration of fine dust in the simulated flue gas. The test results showed that when wind speed was 2.6m·s^-1， voltage was up to 60kV， field length was 6m and dust concentration of fine dust in the simulated flue gas was low to 50mg·m^-3， the dust removal efficiency in the vertically quadrate electrostatic precipitation dust showed high to 96.66%; also， the removal efficiency of dust particle whose diameter was equal to or less than 2μm still achieved 93%.

Key words: superfine dust, electric field length, particle size distribution, removal efficiency