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DUST OF GREATER THAN 1011 Ohm cm RESISTIVITY CAN EASILY COLLECTED.
Electric resistivity, one of the characteristics specific to dust, exerts influences on the performance of electrostatic precipitators (ESP). In collecting high resistivity dust, especially that of greater than 1011 Ohm cm, the conventional ESP (fixed electrode type) becomes tightly covered with layers of dust deposit.
Further operation of the ESP without removing the deposit retrogrades its collection performance remarkably, because the deposit tends to develop high resistivity and the back corona ionization problems, which will in turn cause the corona current at the discharge electrode become abated and the dielectric strength of the adhesive dust become broken down. "Moving Electrode Type Electrostatic Precipitator" embodies a new system to separate the dust deposit by both the moving type electrode and the rotating brush mechanism. And we have made it possible to realize down-sizing of the precipitator itself as well as the effective collection of high resistivity dust in the Dry Type ESP.
The high resistivity dust is disobedient!
Low resistivity dust: (104-1011 Ohm cm) can easily be collected, because:
High resistivity dust (greater than 1011 Ohm cm) is hard to remove, because:
it having been positively charged as negativeion is released from the discharge electrode, is
it, having been positively charged as negative ion is released from the discharge electrode, is
attracted to the collecting electrode.
attracted to the collecting electrode. So far, it is obedient and controllable.
Dust thus collected is
Having a very strong adhesion force, however, the high resistivity dust is hardly separated by the shock of raphammering... (Dust Adhesion).
separated from the electrode by the shock of raphammering easily.
Moreover, it starts releasing positiveion, cancelling negative ion released from the discharge electrode; and, the charging process becomes unstable... (Back Corona Ionization). Then, the dust collection performance retrogrades.