抄録
Electrostatic precipitators are used in decontaminating polluted gases in expressway tunnels in order to improve both driver safety and the environment around tunnels. A conventional electrostatic precipitator has high collection efficiency. However, ESPs have the problem of re-entrainment. This problem occurs in the case of capturing carbon or other particles of low electrical resistance by an electrostatics precipitator. Unfortunately, carbon is the major component of DEPs. In this work, we discussed the method preventing particle re-entrainment, and devised applying trapezoid wave voltage to the collecting electrodes. DC voltage is applied to pre-charger. The collection efficiency of large particles decreases due to particle re-entrainment with DC high voltage applied to collecting section. However, when trapezoid wave voltage applied to the collecting section, the collection efficiency of large particles improves with increasing the frequency, or decreasing the changing ratio of trapezoid wave voltage.
