Device and a method of cleaning an effluent gas from an aluminium production electrolytic cell

摘要

A gas cleaning unit for cleaning an effluent gas of at least one aluminum 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.

主权项

1. A gas cleaning unit for cleaning an effluent gas of at least one aluminium production electrolytic cell, the gas cleaning unit comprising:
at least one contact reactor in which the effluent gas is brought into contact with alumina; a dust removal device in which at least a portion of the alumina having adsorbed pollutants from the effluent gas in the contact reactor is separated from the effluent gas; and a wet scrubber where effluent gas flowing from the dust removal device is brought into contact with an absorption liquid containing water for removing further pollutants from the effluent gas, the wet scrubber positioned at a point vertically higher than that of the dust removal device; wherein a wet scrubber inlet opening for receiving effluent gas flowing from the dust removal device is arranged in a bottom of the wet scrubber, the wet scrubber inlet opening being positioned at a point vertically higher than that of the dust removal device.