Improved rotary device for the catalytic purification of...

B - Operations – Transporting – 01 – D

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B01D 53/88 (2006.01) B01D 53/86 (2006.01) F23G 7/06 (2006.01)

Patent

CA 2183683

The device comprises essentially a crown (1) with a vertical axis and rotationally driven inside a cage (2) which is arranged to define around the crown two variable section zones (Za, Zb) respectively for the introduction of contaminated effluents and the evacuation of purified effluents. The purification is carried out through a passage from one zone to the other through the crown which comprises an annular catalyst bed (9) lining the internal wall thereof and preferably an annular filler (M) which is external to the catalyst bed and which consists of a material having a large heat-exchange surface. Means are used to create important charge losses avoiding leaks by passing round the crown. A burner may be added if necessary in the reaction zone. Said arrangement saves considerably the ground surface and space and reduces the weight of the device as well as its manufacturing and maintenance costs. Application to the purification of gas laden for example with volatile organic compounds.

Le dispositif comporte essentiellement une couronne (1) d'axe vertical entraînée en rotation à l'intérieur d'une cage (2) qui est agencée pour délimiter autour de la couronne deux zones de section variable (Za, Zb) respectivement d'introduction des effluents pollués et d'évacuation des effluents épurés. L'épuration se fait par passage d'une zone à l'autre au travers de la couronne qui comporte un lit de catalyseur annulaire (9) tapissant sa paroi intérieure et de préférence une charge annulaire (M) extérieure au lit catalytique, d'un matériau présentant une grande surface d'échange thermique. Des moyens sont utilisés pour créer des pertes de charge importantes évitant les fuites par contournement de la couronne. Un brûleur peut être adjoint si nécessaire dans la zone de réaction. Cet agencement permet de réduire considérablement l'encombrement et le poids du dispositif ainsi que son coût de fabrication et de maintenance. Application à l'épuration des gaz chargés par exemple de composés organiques volatils.

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