Abstract: In order to improve the purification effect of ESP on high resistivity dust in flue gas， U-I characteristics and collection efficiency of cleaning normal or high resistivity dust gas were measured in the three electrostatic precipitators test model such as ordinary single district， the conventional dual-zone and dual-zone counter-current charged . In the process of cleaning high resistivity dust gas by ordinary single district and the conventional dual-zone ESP， when the voltage rises to 50kV ， dust collection electric field occurs back corona and the collection efficiency begins to decline. While the trends of U-I characteristic curve have no significant differences when dual-zone counter-current charged ESP cleaning gas containing the high specific resistance dust and the normal specific resistance dust， and the collection efficiency and voltage show the same trends. The research results confirm that the new ESP can avoid anti-corona and improve the effects of cleaning dust effectively for the purification of flue gas containing a high resistivity dust.

Key words: electrostatic precipitator(ESP), high specific resistivity dust, back corona, counter-current charge, collection efficiency