Device and a method of cleaning an effluent gas from an aluminium production electrolytic cell
AssigneeALSTOM Technology Ltd
InventorsOdd Edgar BJARNO, Geir WEDDE
Life of this patent
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Abstract
A gas cleaning unit for cleaning an effluent gas of at least one aluminium production electrolytic cell comprises a contact reactor in which the effluent gas is brought into contact with alumina, and a dust removal device for removing at least a portion of the alumina. The gas cleaning unit further comprises a wet scrubber in which the effluent gas is brought into contact with an absorption liquid containing water for removing further pollutants from the effluent gas. The wet scrubber is positioned at a point vertically higher than that of the dust removal device.
Claims4
A method of cleaning an effluent gas of at least one aluminium production electrolytic cell comprising:
- providing a gas cleaning unit comprising
- at least one contact reactor configured such that the effluent gas is contactable with alumina,
- a dust removal device configured such that at least a portion of the alumina having adsorbed pollutants from the effluent gas in the contact reactor is separable from the effluent gas, and
- a wet scrubber configured such that effluent gas flowing from the dust removal device is contactable with an absorption liquid containing water for removing further pollutants from the effluent gas, the wet scrubber being positioned at a point vertically higher than that of the dust removal device;
- contacting effluent gas with alumina adsorbing at least a portion of the content of pollutants of the effluent gas in the contact reactor;
- separating at least a portion of adsorbed pollutants from the effluent gas using the dust removal device;
- and
- contacting the effluent gas with an absorption liquid comprising water in the wet scrubber to further remove pollutants from the effluent gas.
Dependencies are inferred from the claim text.