Electrostatic precipitators with insulated driver electrodes
Electrostatic precipitator (ESP) systems and methods are provided. A system includes at least one corona discharge electrode and at least one collector (and likely, at least a pair of collector electrodes) that extend downstream from the corona discharge electrode. An insulated driver electrode is located adjacent the collector electrode, and where there is at least a pair of collector electrodes, between each pair of collector electrodes. A high voltage source provides a voltage potential to the at least one of the corona discharge electrode and the collector electrode(s), to thereby provide a potential different therebetween. The insulated driver electrode(s) may or may not be at a same voltage potential as the corona discharge electrode, but should be at a different voltage potential than the collector electrode(s).
1. An electrostatic precipitator (ESP) system, comprising:
a corona discharge electrode;
a pair of collector electrodes;
an insulated driver electrode located between said pair of collector electrodes;
a first high voltage source coupled between said corona discharge electrode and said pair of collector electrodes, said first high voltage source configured to provide a first high voltage potential difference between said corona discharge electrode and said pair of collector electrodes; and
a second high voltage source coupled between said pair of collector electrodes and said insulated driver electrode, said second high voltage source configured to provide a second high voltage potential difference between said pair of collector electrodes and said insulated driver electrode.
2. The system of claim 1 , wherein said pair of collector electrodes extend in a downstream direction away from said corona discharge electrode, and wherein said system further comprises a fan to produce a flow of air in said downstream direction.
3. The ESP system of claim 2 , wherein:
said corona discharge electrode produces a corona discharge that imparts a charge on particles in the air that flows past said corona discharge electrode;
said insulated driver electrode repels the charged particles toward said collector electrodes; and
said collector electrodes attract and collect at least a portion of the charged particles.
4. The system of claim 1 , wherein:
a first voltage potential difference exists between said corona discharge electrode and said pair of collector electrodes; and
a second voltage potential difference exists between said insulated driver electrode and said pair of collector electrodes, said first and second voltage potentials differences being substantially the same.
5. The system of claim 3 , wherein:
a first voltage potential difference exists between said corona discharge electrode and said pair of collector electrodes; and
a second voltage potential difference exists between said insulated driver electrode and said pair of collector electrodes, said first voltage potential difference being different than said second voltage potentials difference.
6. The system of claim 1 , wherein said corona discharge electrode and said insulated driver electrode are at the same voltage potential.
7. The system of claim 6 , wherein said high voltage source also provides the high voltage potential difference between said collector electrodes and said insulated driver electrode.
8. The system of claim 1 , wherein said corona discharge electrode and said insulated driver electrode are at different voltage potentials.
9. The system of claim 1 , wherein said corona discharge electrode and said insulated driver electrode are at a same voltage potential.
10. The system of claim 1 , wherein:
said corona discharge electrode is at a first voltage potential;
said pair of collector electrodes are at a second voltage potential different than said first voltage potential; and
said insulated driver electrode is at a third voltage potential different than said first and second voltage potentials.
11. The system of claim 1 , wherein the insulated driver electrode is coated with an ozone reducing catalyst.
12. The system of claim 1 , wherein the insulated driver electrode includes an electrically conductive electrode covered by a dielectric material.
13. The system of claim 12 , wherein the dielectric material is coated with an ozone reducing catalyst.
14. The system of claim 12 , wherein the dielectric material comprises a non-electrically conductive ozone reducing catalyst.
15. The system of claim 12 , wherein the electrically conductive electrode of the insulated driver electrode includes generally flat elongated sides that are generally parallel with said collector electrodes.
16. The system of claim 1 , wherein said insulated driver electrode includes at least one wire shaped electrode covered by a dielectric material.
17. The system of claim 1 , wherein the driver electrode includes a row of wire shaped electrodes each covered by a dielectric material, said row being generally parallel to said collector electrodes.
18. The system of claim 1 , wherein said insulated driver electrode is located downstream from said corona discharge electrode.