{"id":4650,"date":"2020-09-11T07:45:41","date_gmt":"2020-09-11T07:45:41","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4650"},"modified":"2020-09-11T07:45:41","modified_gmt":"2020-09-11T07:45:41","slug":"degassing-equipment","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-equipment\/","title":{"rendered":"\u00c9quipements de d\u00e9gazage"},"content":{"rendered":"

L'\u00e9quipement de d\u00e9gazage est situ\u00e9 sur la ligne reliant le four \u00e0 la station de coul\u00e9e ; son r\u00f4le est d'\u00e9liminer les impuret\u00e9s contenues dans l'aluminium fondu et ses alliages qui nuisent \u00e0 sa qualit\u00e9 et \u00e0 ses propri\u00e9t\u00e9s m\u00e9caniques. Il remplit une double fonction : traitement et chauffage. Le proc\u00e9d\u00e9 de traitement retenu repose sur le principe de la flottation par gaz : du gaz de traitement est inject\u00e9 et dispers\u00e9 uniform\u00e9ment, et de minuscules bulles remontent dans le bain fondu. L\u2019hydrog\u00e8ne est absorb\u00e9 par les bulles et \u00e9limin\u00e9. Le m\u00e9tal alcalin r\u00e9agit chimiquement avec le chlore gazeux, et les inclusions sont emp\u00each\u00e9es d\u2019\u00eatre pi\u00e9g\u00e9es par les bulles. Les plus grosses entrent en collision et les plus petites sont intercept\u00e9es en ligne droite. Elles remontent ensuite \u00e0 la surface du bain fondu pour former des scories.<\/p>\n

La buse rotative d'un \u00e9quipement de d\u00e9gazage joue un r\u00f4le important dans l'affinage et la dispersion des bulles dans l'aluminium en fusion pendant la rotation, mais elle provoque \u00e9galement la rotation de la surface du bain. \u00c0 mesure que la vitesse de la buse continue d\u2019augmenter, une zone de d\u00e9pression se forme au centre de l\u2019aluminium fondu, ce qui intensifie l\u2019absorption d\u2019hydrog\u00e8ne, l\u2019oxydation et la formation d\u2019inclusions de scories dans l\u2019aluminium fondu. Les ailettes de la buse exercent non seulement un effet d\u2019agitation horizontale sur l\u2019aluminium fondu, mais elles font \u00e9galement remonter le m\u00e9lange gaz-liquide. L\u2019effet de pulv\u00e9risation intensifie le brassage de l\u2019aluminium fondu. En raison de l\u2019action m\u00e9canique des pales sur la buse en rotation, l\u2019aluminium fondu se trouve dans un \u00e9tat turbulent, et la force centrifuge le fait se d\u00e9placer radialement dans la buse, tandis que le gaz est pulv\u00e9ris\u00e9 dans l\u2019aluminium fondu avec le flux de celui-ci.<\/p>\n

Lorsque la vitesse de la buse de l'\u00e9quipement de d\u00e9gazage en ligne est faible, celle-ci n'exerce qu'un faible effet d'agitation sur l'aluminium fondu ; la turbulence de l'aluminium fondu est faible et l'effet de fragmentation m\u00e9canique exerc\u00e9 par la pale sur le gaz est limit\u00e9, ce qui se traduit par des bulles de plus grande taille ; lorsque la vitesse est \u00e9lev\u00e9e, la turbulence de l'aluminium fondu est importante. L'intensit\u00e9 de l'\u00e9coulement augmente, la pale exerce un effet de fragmentation m\u00e9canique important sur le gaz, et la force centrifuge subie par l'aluminium en fusion est \u00e9lev\u00e9e. Les bulles se dispersent loin avec l'aluminium liquide, la probabilit\u00e9 de leur agglom\u00e9ration est faible, et leur taille est r\u00e9duite. Par cons\u00e9quent, compte tenu de l\u2019effet de la vitesse de rotation sur l\u2019affinage des bulles et de l\u2019interf\u00e9rence avec l\u2019aluminium fondu, la vitesse de rotation de la buse doit \u00eatre d\u2019environ 250 tr\/min en production r\u00e9elle.<\/p>\n

\"\u00c9quipements<\/p>\n

Les ailettes de la buse jouent un r\u00f4le important dans l'efficacit\u00e9 de \u00e9limination de l'hydrog\u00e8ne<\/a>. Il peut entrer en collision avec les bulles et les briser afin de r\u00e9duire leur taille. Parall\u00e8lement, il utilise la force centrifuge pour disperser les bulles et les r\u00e9partir uniform\u00e9ment, ce qui r\u00e9duit le risque de fusion des bulles et am\u00e9liore l'efficacit\u00e9 de l'\u00e9limination de l'hydrog\u00e8ne.<\/p>\n

Le d\u00e9bit de gaz est un param\u00e8tre important pour le d\u00e9gazage de l'hydrog\u00e8ne de l'aluminium fondu. Pour obtenir un certain effet d'\u00e9limination de l'hydrog\u00e8ne dans un bain de fusion d'une capacit\u00e9 d'environ 60 t, la vitesse d'injection de gaz doit \u00eatre suffisante. Plus le d\u00e9bit de gaz est \u00e9lev\u00e9, plus l'efficacit\u00e9 de l'\u00e9limination de l'hydrog\u00e8ne est grande. Cependant, le d\u00e9bit d\u2019air ne peut pas \u00eatre augment\u00e9 ind\u00e9finiment, et l\u2019alimentation en air peut \u00eatre r\u00e9gl\u00e9e dans une plage comprise entre 1,5 et 6,5 m\u00b3\/h. Si le d\u00e9bit d\u2019air est trop important, il y a un exc\u00e8s de bulles dans la chambre de r\u00e9action. Relativement parlant, une partie de l\u2019aluminium fondu \u00e0 traiter se transforme en gaz, ce qui r\u00e9duit le temps de contact avec le liquide. Par ailleurs, lorsque le d\u00e9bit d\u2019air est trop important, la convection vers le haut et vers le bas de l\u2019aluminium fondu s\u2019intensifie, ce qui entra\u00eene la formation de bulles dans la masse d\u2019aluminium fondu. Le temps de s\u00e9jour dans la cuve est alors consid\u00e9rablement r\u00e9duit, ce qui diminue l\u2019efficacit\u00e9 de l\u2019\u00e9limination de l\u2019hydrog\u00e8ne.<\/p>\n

C'est pourquoi, en production r\u00e9elle, afin de r\u00e9duire l'influence de la convection vers le haut et vers le bas et d'am\u00e9liorer le taux d'utilisation du gaz, il convient d'\u00e9viter autant que possible un d\u00e9bit de gaz excessif. Il est difficile d'am\u00e9liorer l'efficacit\u00e9 du d\u00e9gazage en augmentant uniquement le d\u00e9bit de gaz. Le d\u00e9bit de gaz doit \u00eatre r\u00e9gul\u00e9 de mani\u00e8re \u00e0 ce que le niveau d\u2019aluminium fondu ne bascule pas. D\u2019apr\u00e8s des essais sur site, pour l\u2019alliage 6061, le d\u00e9bit de gaz est compris entre 4 et 4,5 m\u00b3\/h lorsque le taux de d\u00e9gazage d\u00e9passe 50% et que l\u2019aluminium fondu ne bascule pas.<\/p>","protected":false},"excerpt":{"rendered":"

Degassing equipment is located on the line between the furnace and the casting station, and its role is to remove impurities contained in the molten…<\/p>","protected":false},"author":1,"featured_media":4652,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4294,396,4287,4288,397,4293,4290,154,4291,4289,4292,1485,4286,4295,4299,4297,4298,4296,4347,4346,4300,1706],"class_list":["post-4650","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminium-degass","tag-aluminium-degassing","tag-aluminium-degassing-flux","tag-aluminium-degassing-nitrogen","tag-aluminium-degassing-process","tag-aluminum-degassing-equipment","tag-aluminum-degassing-flux","tag-aluminum-degassing-process","tag-aluminum-degassing-system","tag-aluminum-degassing-tablets","tag-aluminum-degassing-units","tag-degassing-equipment","tag-degassing-equipment-supplier","tag-degassing-machine","tag-degassing-machine-buy","tag-degassing-machine-coimbatore","tag-degassing-machine-parts","tag-degassing-machine-pune","tag-degassing-with-nitrogen","tag-gridge-degassing-machine","tag-nitrogen-degassing-machine","tag-rotary-degassing-machine"],"yoast_head":"\nDegassing 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