The structure of ESP is shown in Fig.2. The ESP consists of the pre-charger and the collector.
The pre-charger consists of high voltage spike-plate electrodes and grounded plate electrodes.
The applied voltage were between DC-4.0 and -8.0 kV (corona currents were between 0.03 and 1.03 mA, current densities were between 0.08 and 2.8 mA/m2 ) in the pre-charger. The collector has a parallel-plates configuration. The applied voltage was DC +10 kV. The spacing between the adjacent plates was 9 mm, the grounded electrode lengths were 150 mm, and the high voltage electrode lengths were 130 mm in the pre-charger and the collector.