F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
F27B 9/18 (2006.01) F27D 25/00 (2010.01)
Patent
CA 2567508
The inventive multi-level furnace comprises a furnace wall (10) delimiting a cylindrical space having a vertical axis (11), a plurality of beds (12, 22) defining the levels inside said cylindrical space and at least one scraping arm (16, 16'; 26, 26') which is provided with a wall scraper (20, 20',32) and associated with the bed (12, 22) in such a way that it is rotatable about the vertical axis (11) of the furnace. During scraping arm (16, 16'; 26, 26') rotation, said wall scraper (20, 20'; 32) defines a scraped area (52; 52') on the internal surface of the furnace wall (10) which comprises a plurality of wall cavities (54; 54') forming a row of access openings (56; 56') in the scraped area (52; 52'), thereby making it possible to avoid the formation of a hardened crust adhered to the internal surface (42) of the furnace wall (10) and to develop braking shocks in the scraping arm (16, 16'; 26, 26').
Un four à étages comprend une paroi de four (10) délimitant un espace cylindrique à axe vertical (11), une pluralité de soles (12; 22) délimitant les étages à l'intérieur de cet espace cylindrique et au moins un bras de raclage (16, 16'; 26, 26') avec un racleur de paroi (20, 20'; 32). Ce bras de raclage (16, 16'; 26, 26') est associé à une des soles (12; 22) où il est apte à tourner autour de l'axe vertical (11) du four. Le racleur de paroi (20, 20'; 32) définit lors de la rotation du bras de raclage (16, 16'; 26, 26') une zone raclée (52; 52') sur la surface interne (42) de la paroi de four (10). La paroi de four (10) comprend une pluralité de cavités de paroi (54; 54') qui forment une succession d'ouvertures d'accès (56; 56') dans ladite zone raclée (52; 52'). On évite ainsi la formation d'une croûte durcie adhérant à la surface interne (42) de la paroi de four (10) et engendrant des secousses de freinage dans le bras de raclage (16, 16'; 26, 26').
Gowling Lafleur Henderson Llp
Paul Wurth S.a.
LandOfFree
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