{"id":4820,"date":"2020-09-16T10:13:02","date_gmt":"2020-09-16T10:13:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4820"},"modified":"2020-09-16T10:13:02","modified_gmt":"2020-09-16T10:13:02","slug":"degassing-device","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-device\/","title":{"rendered":"Dispositif de d\u00e9gazage"},"content":{"rendered":"<p>Lorsque l'aluminium fondu p\u00e9n\u00e8tre dans l'entr\u00e9e du dispositif de d\u00e9gazage, il convient d'emp\u00eacher l'air de s'introduire dans le dispositif d'\u00e9limination de l'hydrog\u00e8ne par cette entr\u00e9e, ce qui entra\u00eenerait une augmentation des inclusions oxyd\u00e9es et nuirait \u00e0 l'efficacit\u00e9 de l'\u00e9limination de l'hydrog\u00e8ne. En r\u00e8gle g\u00e9n\u00e9rale, la position d\u2019entr\u00e9e de l\u2019aluminium fondu est con\u00e7ue pour \u00eatre inf\u00e9rieure au niveau de l\u2019aluminium fondu dans la goulotte, de sorte que l\u2019entr\u00e9e du dispositif de d\u00e9gazage soit immerg\u00e9e sous l\u2019aluminium fondu et que l\u2019air ne puisse pas p\u00e9n\u00e9trer dans la cuve d\u2019affinage, ce qui am\u00e9liore le <a href=\"http:\/\/www.alalloycasting.com\/fr\/aluminum-degassing\/\">d\u00e9gazage de l'aluminium<\/a> effet.<\/p>\n<p>L'embouchure de la cuve de d\u00e9gazage est immerg\u00e9e dans l'aluminium en fusion, ce qui emp\u00eache l'air de p\u00e9n\u00e9trer dans le dispositif de d\u00e9gazage, r\u00e9duisant ainsi le nombre d'inclusions oxyd\u00e9es g\u00e9n\u00e9r\u00e9es dans la cuve de d\u00e9gazage et am\u00e9liorant l'efficacit\u00e9 de l'\u00e9limination de l'hydrog\u00e8ne.<\/p>\n<p>Afin de r\u00e9duire la teneur en air dans la cuve d'affinage, de limiter le contact entre l'aluminium fondu et l'air et de diminuer le degr\u00e9 d'oxydation de l'aluminium fondu, tout en optimisant les entr\u00e9es et sorties de la cuve d'affinage, celle-ci est remplie de gaz protecteur. Le gaz protecteur est du N\u2082 ou de l'Ar. Sous la protection d'un gaz inerte, l'aluminium fondu dans la cuve d'affinage s'oxyde difficilement et absorbe peu d'hydrog\u00e8ne, ce qui am\u00e9liore l'efficacit\u00e9 de l'\u00e9limination de l'hydrog\u00e8ne.<\/p>\n<p>Au cours du processus d\u2019\u00e9limination de l\u2019hydrog\u00e8ne, celui-ci est \u00e9vacu\u00e9 \u00e0 tout moment de la cuve d\u2019affinage apr\u00e8s affinage et s\u00e9paration de l\u2019aluminium fondu. Par cons\u00e9quent, le gaz protecteur doit \u00eatre maintenu \u00e0 une certaine pression, et la vanne d\u2019\u00e9vacuation de la cuve d\u2019affinage est automatiquement soumise \u00e0 une certaine pression. Il suffit de l\u2019ouvrir pour lib\u00e9rer le gaz pr\u00e9sent \u00e0 l\u2019int\u00e9rieur de la cuve d\u2019affinage. Dans cette situation, l'atmosph\u00e8re \u00e0 l'int\u00e9rieur de la cuve d'affinage maintient en permanence une certaine pression positive. Le fait que l'hydrog\u00e8ne soit \u00e9vacu\u00e9 \u00e0 temps emp\u00eache l'air de p\u00e9n\u00e9trer dans la cuve d'affinage et \u00e9vite une absorption secondaire d'hydrog\u00e8ne par l'aluminium en fusion.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4828\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Degassing-Device-1.jpg\" alt=\"Dispositif de d\u00e9gazage\" width=\"400\" height=\"500\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Degassing-Device-1.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Degassing-Device-1-240x300.jpg 240w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>En raison de la protection par gaz inerte dans le <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-unit\/\">unit\u00e9 de d\u00e9gazage<\/a>, dans une atmosph\u00e8re de gaz inerte, l'H\u2082 ne peut pas br\u00fbler sans la pr\u00e9sence d'O\u2082, mais au niveau de l'orifice de sortie de gaz, le gaz est \u00e9vacu\u00e9 du dispositif d'\u00e9limination de l'hydrog\u00e8ne, et l'H\u2082 \u00e0 haute temp\u00e9rature entre en contact avec l'O\u2082 pr\u00e9sent dans l'air. Il s'enflamme imm\u00e9diatement, ce qui explique la pr\u00e9sence d'une flamme au niveau de l'orifice de sortie de gaz. Ce ph\u00e9nom\u00e8ne s\u2019explique par le fait que l\u2019hydrog\u00e8ne (H) entre en contact avec l\u2019oxyg\u00e8ne (O\u2082) pr\u00e9sent dans l\u2019air, ce qui provoque la combustion.<\/p>\n<p>Le rotor en graphite sert \u00e0 \u00e9liminer l'hydrog\u00e8ne pr\u00e9sent dans l'aluminium fondu par adsorption d'un gaz inerte ; il s'agit du principal proc\u00e9d\u00e9 d'\u00e9limination de l'hydrog\u00e8ne en continu. Cependant, pendant le processus de remont\u00e9e des bulles de gaz inerte dans l'aluminium fondu, la temp\u00e9rature de ce dernier atteint 720 \u00b0C. Parall\u00e8lement, la pression exerc\u00e9e par l\u2019aluminium fondu sur les bulles diminue progressivement au fur et \u00e0 mesure que celles-ci remontent \u00e0 la surface, ce qui entra\u00eene une expansion de leur volume et une interaction entre elles. En raison de cette expansion volumique, elles fusionnent, ce qui r\u00e9duit la surface totale des bulles en contact avec l\u2019aluminium fondu et diminue l\u2019efficacit\u00e9 de l\u2019\u00e9limination de l\u2019hydrog\u00e8ne.<\/p>","protected":false},"excerpt":{"rendered":"<p>When the aluminum liquid enters the inlet of the degassing device, in order to prevent the air from entering the hydrogen removal device from the&hellip;<\/p>","protected":false},"author":1,"featured_media":4829,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4308,4309,4305,4311,4306,1762,116,4310,4302,4351,4303,4312,1754,1770,1767,4464,4313,1771,4304,4301,4307,834,1980,1772],"class_list":["post-4820","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-and-nitrogen","tag-aluminum-hydrogen","tag-deaerator","tag-deaerator-price","tag-degasser","tag-degassing-aluminum-casting","tag-degassing-in-casting","tag-degassing-meaning","tag-degassing-molten-aluminum","tag-degassing-molten-aluminum-with-nitrogen","tag-degassing-of-aluminium-alloys","tag-degassing-of-aluminum","tag-degassing-process-in-aluminium","tag-how-to-degas-aluminum","tag-hydrogen-degassing","tag-in-line-degasser","tag-metal-degassing","tag-methods-of-degassing-in-foundry","tag-mobile-degassing-unit","tag-nitrogen-degassing-aluminum","tag-purification-of-aluminium","tag-rotary-degasser","tag-rotary-degassing-aluminum","tag-rotary-degassing-unit"],"yoast_head":"<!-- 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