Voltage–current characteristics of needle-plate system with different media on the collection plate

• The V–I characteristics of a needle-plate system are measured.
• Several widely used types of filter media and collection plates are considered.
• The effects of dust cake thickness on V–I characteristics are investigated.

The hybrid electrostatic precipitator and media filtration system are significantly more promising than traditional filtration methods. This paper investigated the electrostatic characteristics of different filter media types used in the hybrid filtration system. The voltage–current (V–I) characteristics of needle-plate system, the collection plate of which is covered by filter media, were measured. Seven types of filter media and collection plate including iron plate, iron grid and activated carbon layer were considered. The glass fiber and polyethylene media reduce approximately 20% of the current value. The bag filter increases the current value because of the back corona effect. Polyester and polyethylene terephthalate materials with activated carbon attached can increase the current value significantly. In addition, this paper studied the effects of cake thickness on V–I characteristics. The results show that the cake layer has little influence on the V–I character when its thickness is not very big.