Cooling system for cathodes in direct current electric arc...

Details Cooling system for cathodes in direct current electric arc... Cooling system for cathodes in direct current electric arc...

H - Electricity

05

B

H05B 7/12 (2006.01) C21C 5/52 (2006.01) F27B 3/24 (2006.01) F27D 9/00 (2006.01)

Patent

CA 2216458

Cooling system for cathodes, or electrodes, (11) in Direct Current electric arc furnaces, the cathodes (11) comprising a lower consumable graphite part (11a), from which the electric arc is sparked, associated at the upper part with a hollow metallic part (11b) by means of a joint (13), inside the metallic part (11b) there being included a closed cooling circuit (19) with water or other similar cooling fluid, defining an area of evaporation (17) arranged substantially in cooperation with the lower end of the metallic part (11b) and an area of condensation (18) arranged in cooperation with a desired upper area of the metallic part (11b), the area of condensation (18) cooperating with a heat exchanger (15) associated with the outer wall of the metallic part (11b), there also being included an ascending channel (14) for the steam (19a) from the evaporation area (17) to the area of condensation (18) and at least a descending channel (16) whereby the condensation descends, under force of gravity,from the area of condensation (18) to the area of evaporation (17), the descending channel (14) and ascending channel (16) communicating with each other in correspondence with the area of evaporation (17) and the area of condensation (18), the descending channel (16) corresponding with the inner wall of the metallic part (11b) and having an inferior section than the section of the ascending channel (14).

Cette invention concerne un système de refroidissement des cathodes, ou électrodes, (11) d'un four à arc électrique à courant continu, les dites cathodes (11) comportant une partie inférieure consommable en graphite (11a) dont jaillit l'arc électrique couplée en partie supérieure à une pièce métallique creuse (11b) au moyen d'un joint (13) inséré dans ladite pièce et comprenant un circuit fermé de refroidissement à eau ou autre liquide de refroidissement analogue, l'ensemble définissant une zone d'évaporation (17) située sensiblement à l'extrémité basse de la pièce métallique (11b) et une zone de condensation (18) située sensiblement à l'extrémité haute de la dite pièce métallique (11b), la zone de condensation (18) agissant de concert avec un échangeur de chaleur (15) monté sur la paroi extérieure de la pièce métallique (11b). Il est également prévu un canal ascendant (14) pour le transport de vapeur (19a) de la zone d'évaporation (17) à la zone de condensation (18) et au moins un canal descendant (16) pour la recirculation par gravité des condensats vers la zone d'évaporation (17), les canaux descendant (14) et ascendant (16) communiquant l'un avec l'autre vis-à-vis la zone d'évaporation (17) et la zone de condensation (18), le canal descendant étant délimité par la paroi intérieure de la pièce métallique (11b) et ayant une section inférieure à celle du canal ascendant (14).

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