Novel EHD-Assisted ESP for Collection of Low Resistive Diesel Particulates

The novel electrohydrodynamically-assisted electrostatic precipitator (EHD ESP) was developed to suppress particle reentrainment for collection of low resistive diesel particulates. The collection efficiency was compared between the EHD ESP and the conventional ESP using two large diesel engines; 2.3 L and 3.2 L engines. The gas velocity was varied in the range of 1.35 to 7.3 m/s and the load was set at 0, 25 and 50%, where the operating gas temperatures were varied from 120 o C to 280 o C for 3.2 L engine. The particle size dependent collection efficiency was evaluated for the particle size ranging in 20 to 5,000 nm using a scanning mobility particle sizer (SMPS) and a particle counter (PC). The EHD ESP showed excellent suppression of particle reentrainment and collection efficiency even for high gas flow velocities in comparison with the conventional ESP.