Cooled roof for electric arc furnaces and ladle furnaces

F - Mech Eng,Light,Heat,Weapons – 27 – D

Patent

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Details

F27D 1/18 (2006.01) F27B 3/24 (2006.01) F27D 17/00 (2006.01)

Patent

CA 2320121

Cooled roof for electric arc furnaces (20) or ladle furnaces (29), the roof being used as a covering element and including a cooling system comprising tubes fed with cooling fluid, the roof including at least a central aperture (25) for the positioning and movement of the electrodes (30) and at least a peripheral aperture (14) for the aspiration and discharge of the fumes, the aperture (14) being connected to intake systems, the roof including two single- block cooling structures, inner (11) and outer (12), consisting of respective bent tubes (15, 16) developing according to adjacent and super-imposed rings or spirals, the inner (11) and outer (12) cooling structures being associated with one another at least in correspondence with the respective bases facing towards the inside of the furnace (20, 29), between the inner cooling structure (11) and the outer cooling structure (12) there being defined an annular interspace (13) in which the fumes circulate in an annular direction and slow down, the annular interspace (13) communicating with the peripheral aperture, the inner cooling structure (11) including fume-transit interstices connecting the inside of the furnace (20, 29) with the annular interspace (13).

On décrit un plafond refroidi pour fours électriques à arc (20) ou fours-poche (29), qui s'utilise comme élément de couverture et comprend un système de refroidissement équipé de tuyaux alimentés par un liquide de refroidissement. Le plafond inclut au moins une ouverture centrale (25) pour le positionnement et le déplacement des électrodes (30), et au moins une ouverture périphérique (14) d'aspiration et d'évacuation des fumées raccordée à des systèmes d'admission. Le plafond inclut deux structures de refroidissement monoblocs, l'une interne (11), l'autre externe (12), constitués de tuyaux coudés (15, 16) respectifs s'étendant à proportion d'anneaux ou spirales adjacents superposés. Les structures de refroidissement interne (11) et externe (12) coopèrent l'une avec l'autre au moins en correspondance avec leur base respective tournées vers l'intérieur du four (20, 29). La structure de refroidissement interne (11) et la structure de refroidissement externe (12) délimitent un espace annulaire (13) où les fumées circulent dans un sens annulaire et ralentissent. Cet espace annulaire (13) communique avec l'ouverture périphérique et la structure de refroidissement interne (11) inclut des interstices de passage des fumées reliant l'intérieur du four (20, 29) à l'espace annulaire (13).

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