| 摘要 |
1491545 Electrostatic separation LECTROSTATIC AB 5 Feb 1975 [13 Feb 1974] 4982/75 Heading B2J An electrostatic filter comprises an earthed tube 1 provided with openings 2, e.g. of circular or elongate shape, and having mounted therein a discharge electrode 4 connected to a high voltage dc supply 5. The tube 1 is disposed in a housing 8 having a chamber 10 with_an inlet 13 for air containing solid particles or liquid droplets, e.g. oil, and also communicates with a suction chamber 9 having an outlet 15 for clean air. The surface of the tube 1 in the chamber 10 is provided with a layer 11 of air-permeable material, e.g. of steel wool, foam plastics or mineral wool, the arrangement being such that the pressure drop of the air passing through the layer and the openings 2 to the interior of the tube 1 is substantially the same along the whole length of the tube covered by the layer, whereby the layer is uniformly subjected to contaminated air drawn in through the inlet 13. In operation, electrons from the electrode 4 flow through the openings 2 and charge the droplets or the like in the incoming air, which droplets are then attracted to the surface of the tube 1 where they coalesce and eventually drop off to collect in the bottom of housing 8. The tube 1 may be constituted by a perforated metal foil attached to the layer 11. The inlet 13 may be provided with a pre-charging electrode 17.
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