A method and a device for verifying and controlling the...

B - Operations – Transporting – 01 – D

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B01D 53/10 (2006.01) B01D 53/30 (2006.01) B01D 53/68 (2006.01) C25C 3/22 (2006.01)

Patent

CA 2741739

A gas cleaning system (1) is designed for removing hydrogen fluoride from a process gas generated during the production of aluminium from alumina. The gas cleaning system (1) comprises a scrubbing chamber (8, 10, 12) for purposes of mixing the process gas with particulate alumina, and a filter device (24,26,28) which is located downstream of the scrubbing chamber (8,10,12) with respect to the direction of flow of the process gas. A sulphur dioxide measurement device (40, 42, 44, 50) is operative for measuring the amount of the concentration of sulphur dioxide that is present in the process gas downstream of the filter device (24, 26, 28). A controller (46) is operatively connected to the sulphur dioxide measurement device (40, 42, 44, 50) and is operative for utilizing the measured amount of the concentration of sulphur dioxide for purposes of evaluating the efficiency of the hydrogen fluoride removal by the gas cleaning system (1).

L'invention porte sur un système d'épuration de gaz (1) conçu pour l'élimination de fluorure d'hydrogène à partir d'un gaz de procédé produit au cours de la fabrication d'aluminium à partir d'alumine. Le système d'épuration de gaz (1) comprend une chambre d'épuration (8, 10, 12) destinée au mélange du gaz de procédé avec de l'alumine particulaire et un dispositif de filtre (24, 26, 28), qui est situé en aval de la chambre d'épuration (8, 10, 12) par rapport au sens de l'écoulement du gaz de procédé. Un dispositif de mesure du dioxyde de soufre (40, 42, 44, 50) est efficace pour la mesure de la hauteur de la concentration du dioxyde de soufre qui est présent dans le gaz de procédé en aval du dispositif de filtre (24, 26, 28). Un régulateur (46) est relié de manière fonctionnelle au dispositif de mesure du dioxyde de soufre (40, 42, 44, 50) et est efficace pour utiliser la hauteur mesurée de la concentration du dioxyde de soufre afin d'évaluer l'efficacité de l'élimination du fluorure d'hydrogène par le système d'épuration de gaz (1).

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