Method and apparatus for filtering process gas

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 46/04 (2006.01) B01D 46/02 (2006.01) B01D 46/24 (2006.01) B01D 47/06 (2006.01)

Patent

CA 2672162

The invention relates to a method and an apparatus for filtering process gas created in the ferroalloy smelting process, i.e. carbon monoxide gas, in order to essentially reduce the content of solids in the gas. In the filtering unit (24) gas containing solids is conducted through at least one filtering element (7), inert gas blowing (8) is directed to the filtering element (7) in order to detach the solid material from the surface of the filtering element (7), and in order to remove from the filtering unit (24) the solid material detached from the the surface of the filtering element (7) the solid material is slurried by means of liquid fed (11) into the filtering unit (24). The slurry containing the sold material is removed from the filtering unit (24) through a discharge chamber (12). The filtering unit (24) includes a filtering chamber (1) and a discharge chamber (12) that is mechanically connected to the filtering chamber, as well as a discharge conduit (6) for the solids filtered from the gas, and the filtering chamber (1) is provided with at least one filtering element (7) for separating solids from the gas and at least one nozzle (8, 11) for discharging the filtered solids from the filtering chamber (1).

L'invention concerne un procédé et un appareil pour filtrer un gaz de traitement créé dans le procédé de fusion de ferroalliage, à savoir le monoxyde de carbone gazeux, afin de réduire substantiellement la teneur en matières solides dans le gaz. Dans l'unité de filtration (24), le gaz contenant des matières solides est conduit à travers au moins un élément filtrant (7) une insufflation de gaz inerte (8) est dirigée sur l'élément filtrant (7) afin de détacher les matières solides de la surface de l'élément de filtration (7), et afin de retirer de l'unité de filtration (24) les matières solides détachées de la surface de l'élément filtrant (7), les matières solides sont mises en bouillie au moyen d'un liquide (11) introduit dans l'unité de filtration (24). La bouillie contenant les matières solides est retirée de l'unité de filtration (24) à travers une chambre de décharge (12). L'unité de filtration (24) comprend une chambre de filtration (1) et une chambre de décharge (12) mécaniquement reliée à la chambre de filtration, ainsi qu'à un conduit de décharge (6) pour les matières solides filtrés à partir du gaz, et la chambre de filtration (1) comporte au moins un élément filtrant (7) pour séparer les matières solides du gaz et au moins une buse (8, 11) pour décharger les matières solides filtrées de la chambre de filtration (1).

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