Yasuhiro Takagi

Suppression of particle deposition onto downstream wall in an AC Electrostatic Precipitator with neutralisation

Electrostatic Precipitators (ESPs) are used to decontaminate polluted environment around the tunnels. A conventional ESP has high collection efficiency but still has a problem in that its downstream walls are polluted due to particle deposition. The experiments carried out in this study have focused on how the particle deposition can be prevented by neutralising the gases. The collection efficiency as a function of particle diameter and the amount of deposited particles on the wall were studied on three types of the ESP: the universal ESP under DC operating mode (DCESP), the ESP under AC operating mode (ACESP) and the ACESP with gas-neutralising equipment (ACESP with neutralisation). Electrostatic field intensity and ion concentration were also measured to understand the state of neutralising the gases. The ACESP, an invention of the authors, prevents particle re-entrainment. The ACESP with neutralisation, which not only prevents the particle re-entrainment but also decreases the charge amount of the downstream gases, was most effective in decreasing the amount of deposited particles.

Improving Nano-particle Collection Efficiency and Suppressing Particle Re-entrainment in an AC Electrostatic Precipitator with Hole-punched Electrode

the experiments carried out in this study have focused on improving nano-particle collection efficiency and suppressing particle re-entrainment at the same time in an ACESP with hole-punched electrode a trapezoidal ac high voltage was applied to a collector the collection efficiencies as a function of particle diameter were studied on three ESP cases, which were the universal DCESP, DCESP with hole-punched electrode and ACESP with hole-punched electrode as a result, ACESP with hole-punched electrode was successfully developed.