Method for electrostatically charging up solid or liquid particles suspended in a gas stream by means of ions
AssigneeBBC Brown, Boveri & Company, Limited
InventorMichael Hirth
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Abstract
A method for electrostatically charging up particles suspended in a gas stream by means of ions originating from a separate unipolar ion source, wherein the ions are injected into the gas/particle stream by means of an alternating field and are deposited on the particles. The frequency of the alternating field is chosen so high at the specified maximum field strength that the drive velocity of the ions during a half-cycle is insufficient to carry the ions to the counter-electrode. As a result, undesirable wall recombination of the ions is avoided.
Claims5
A method for electrostatically charging up solid or liquid particles suspended in a gas stream by means of ions, comprising:
- generating ions from separate, independent unipolar ion sources arranged opposite a counter-electrode and an electrode;
- injecting the ions into the gas/particle stream by applying an electrical alternating field transversely to the flow direction such that the frequency of the alternating field at a specified maximum field strength is chosen so high that the drift velocity of the ions during a half-cycle is insufficient to propel the ions to the counter-electrode and discharge the ions at the counter-electrode as a result of wall recombination.
Dependencies are inferred from the claim text.