Fine dust in the atmosphere is one of the key factors causing air pollution as well as fog and haze. Due to the limited efficiency of fine dust collection in conventional dust removal technology, pre-charged dust coagulation between particles to increase the effective collecting diameter, is an effective way to improve the dust collection efficiency. Currently, coagulation technology research falls into three mainly aspects: electric coagulation technology in constant electric field, alternating electric field and pulsed electric fields. The advantages and disadvantages as well as the research status and trends are fully analyzed in this paper, of which the technology that uses alternating or pulsed power supply for pre-charge device has more advantages and efficiency in coagulation. They will improve the efficiency of electric coagulation in further on the improved airflow pole with form and structure and the technical development of alternating or pulsed powers, which will make the coagulation and filtration technologies and new composite technology an important development direction of fine dust governance.
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