Electrostatic precipitator and method
AssigneeHudson Pulp & Paper Corp.
InventorJerry Zucker
Life of this patent
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Abstract
A method of an apparatus for improving the capacity and efficiency of electrostatic precipitators by increasing the average field intensity. The precipitator is supplied with a substantially constant base level DC voltage that is less than the sparking threshold level of the precipitator, and superimposed thereon is a periodic DC voltage waveform of short duration having peak levels that substantially exceed the sparking threshold level. By controlling the characteristics of the periodic DC voltage waveform the average applied voltage is greater than the sparking voltage but the duration of the instantaneously applied voltage is not sufficient to cause sparking in the precipitator.
Claims12
Apparatus for operating an electrostatic precipitator comprising:
- voltage supply means connected to said precipitator for supplying thereto a substantially constant DC voltage having a magnitude greater than the corona discharge level but less than the sparking threshold level of said precipitator;
- and periodic impulse voltage supply means connected to said precipitator for supplying thereto successive impulses having peak voltage levels, each of which substantially exceeds said sparking threshold level, each of said impulses having a voltage that exceeds said sparking threshold level for a length of time less than sufficient to cause a sparking condition in said precipitator.
A method of energizing an electrostatic precipitator, comprising the steps of:
- applying to said precipitator a substantially constant DC voltage having a value which is less than the sparking threshold level of said precipitator;
- and applying to said precipitator a series of voltage impulses, each of said impulses having a peak level that substantially exceeds said sparking threshold level for a length of time that is not of sufficient duration to produce a sparking condition whereby the average DC voltage level applied to said precipitator is greater than said sparking threshold level.
Dependencies are inferred from the claim text.