{"id":5683,"date":"2020-10-19T02:14:00","date_gmt":"2020-10-19T02:14:00","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5683"},"modified":"2020-10-26T03:43:27","modified_gmt":"2020-10-26T03:43:27","slug":"nitrogen-degassing-machine","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/nitrogen-degassing-machine\/","title":{"rendered":"Machine de d\u00e9gazage \u00e0 l'azote"},"content":{"rendered":"<p>La machine de d\u00e9gazage \u00e0 l'azote sert \u00e0 contr\u00f4ler la teneur en hydrog\u00e8ne, en m\u00e9taux alcalins et en inclusions dans la masse d'aluminium fondu avant la coul\u00e9e.<\/p>\n<p>Au cours des 20 derni\u00e8res ann\u00e9es, le <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-with-nitrogen\/\">d\u00e9gazage \u00e0 l'azote<\/a>\u00a0pour l'aluminium a fait l'objet de recherches approfondies.<\/p>\n<p>La solubilit\u00e9 de l'hydrog\u00e8ne et les param\u00e8tres qui l'influencent interagissent toujours avec l'atmosph\u00e8re, cr\u00e9ant ainsi un \u00e9quilibre entre l'hydrog\u00e8ne gazeux pr\u00e9sent dans l'air et l'hydrog\u00e8ne pr\u00e9sent dans l'aluminium fondu. Cependant, la pression partielle (ou la teneur) en hydrog\u00e8ne dans l'atmosph\u00e8re n'a pratiquement aucune incidence. Par cons\u00e9quent, l'hydrog\u00e8ne provient de la vapeur d'eau pr\u00e9sente dans l'atmosph\u00e8re, qui r\u00e9agit facilement avec l'aluminium liquide pour produire deux produits de r\u00e9action probl\u00e9matiques, \u00e0 savoir l'alumine (inclusions) et l'hydrog\u00e8ne (gaz).<\/p>\n<p>Le probl\u00e8me li\u00e9 \u00e0 la pr\u00e9sence d'hydrog\u00e8ne dans l'aluminium ne tient pas au fait que celui-ci soit particuli\u00e8rement soluble dans l'aluminium liquide, mais au fait qu'il soit particuli\u00e8rement insoluble dans l'aluminium solide ; l'hydrog\u00e8ne va donc se pr\u00e9cipiter hors de la solution lors de la solidification. La machine de d\u00e9gazage de l'aluminium \u00e0 l'azote doit \u00e9liminer l'hydrog\u00e8ne de la masse fondue avant de purger celle-ci avec de l'azote, un gaz inerte.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5710\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Nitrogen-Degassing-Machine-1.jpg\" alt=\"Machine de d\u00e9gazage \u00e0 l&#039;azote\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Nitrogen-Degassing-Machine-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Nitrogen-Degassing-Machine-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Il est essentiel de bien comprendre le m\u00e9canisme d'\u00e9limination de l'hydrog\u00e8ne pour identifier et influencer les facteurs qui d\u00e9terminent la meilleure m\u00e9thode d'\u00e9limination.<\/p>\n<p>L'hydrog\u00e8ne atomique est dissous dans l'aluminium liquide et r\u00e9parti uniform\u00e9ment. Lorsque les bulles inertes s\u00e8ches sont introduites dans la masse fondue, la pression partielle interne d'hydrog\u00e8ne est pratiquement nulle. Dans la bulle d\u2019azote, un \u00e9quilibre local s\u2019\u00e9tablit rapidement entre la concentration en H et la pression partielle de H dans la couche limite de la masse fondue. La vitesse de diffusion de l\u2019hydrog\u00e8ne depuis la masse fondue vers la couche limite est limit\u00e9e, et la recombinaison de l\u2019hydrog\u00e8ne, passant de l\u2019\u00e9tat atomique \u00e0 l\u2019\u00e9tat mol\u00e9culaire, est tr\u00e8s rapide. La concentration en hydrog\u00e8ne dans les bulles augmente \u00e0 mesure qu\u2019elles remontent vers la surface du bain fondu. La vitesse de transfert de l\u2019hydrog\u00e8ne d\u00e9pend non seulement de la vitesse de diffusion, mais aussi de la surface totale de l\u2019interface des bulles. Un d\u00e9bit donn\u00e9 de gaz inerte pr\u00e9sente une plus grande surface d\u2019interface et permet la formation de bulles plus petites.<\/p>\n<p>De plus, avec la diminution du nombre de bulles, le temps de s\u00e9jour de chaque bulle dans la masse fondue s'allonge. Cela s'explique par la diminution de la vitesse terminale, ce qui allonge le temps de transport de l'hydrog\u00e8ne. Des zones de r\u00e9action plus profondes permettent de disposer de plus de temps pour atteindre l'\u00e9quilibre, car les bulles restent plus longtemps dans la masse fondue avant d'atteindre la surface. Par cons\u00e9quent, le d\u00e9gazeur d'azote pour l'aluminium doit produire un minimum de bulles au fond de la cuve de traitement.<\/p>\n<p>Ce r\u00e9sultat est obtenu \u00e0 des vitesses de rotor \u00e9lev\u00e9es. La masse fondue est \u00e9galement m\u00e9lang\u00e9e afin d\u2019obtenir une r\u00e9partition homog\u00e8ne de l\u2019hydrog\u00e8ne. Le traitement par pistolet de pulv\u00e9risation marque le d\u00e9but du d\u00e9gazage industriel, mais ce proc\u00e9d\u00e9 produit g\u00e9n\u00e9ralement de grosses bulles dont le diam\u00e8tre est compris entre 10 et 50 mm. La taille des bulles pr\u00e9sente une grande variabilit\u00e9 et l\u2019homog\u00e9n\u00e9it\u00e9 de la masse fondue est limit\u00e9e. Les briques poreuses, qu\u2019elles soient raccord\u00e9es \u00e0 la sortie de la lance ou au fond du four, produisent des bulles fines d\u2019un diam\u00e8tre de 10 \u00e0 20 mm, mais m\u00eame avec celles-ci, l\u2019homog\u00e9n\u00e9isation et la r\u00e9partition des bulles ne sont pas optimales. Enfin, le d\u00e9veloppement du syst\u00e8me \u00e0 jet rotatif avec rotor a r\u00e9solu le probl\u00e8me de la distribution insuffisante du gaz et a permis d\u2019obtenir des bulles dont le diam\u00e8tre est compris entre 3 et 10 mm.<\/p>","protected":false},"excerpt":{"rendered":"<p>Nitrogen degassing machine is used to control the content of hydrogen, alkali metal and inclusion in aluminum melt before casting. In the past 20 years,&hellip;<\/p>","protected":false},"author":1,"featured_media":5709,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233,18],"tags":[5873,5874,5880,5864,5867,5866,5865,5872,5868,5881,5878,5875,5876,5877,5879,5871,5882,5870,5869],"class_list":["post-5683","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-degassing-unit","tag-nitrogen-degassing-machine-for-aluminium-philippine","tag-nitrogen-degassing-machine-for-aluminium-supplier-philippine","tag-nitrogen-degassing-machine-for-aluminium-vietnam","tag-nitrogen-degassing-machine-for-aluminum-philippines","tag-nitrogen-degassing-machine-for-aluminum-philippines-location","tag-nitrogen-degassing-machine-for-aluminum-philippines-news","tag-nitrogen-degassing-machine-for-aluminum-philippines-price","tag-nitrogen-degassing-machine-for-anodized-aluminum-philippines","tag-nitrogen-degassing-machine-for-brothers-aluminum-philippines","tag-nitrogen-degassing-machine-for-hyundai-aluminium-vietnam","tag-nitrogen-degassing-machine-for-philippines-aluminium","tag-nitrogen-degassing-machine-for-philippines-aluminum","tag-nitrogen-degassing-machine-for-philippines-aluminum-supplier","tag-nitrogen-degassing-machine-for-philippines-sheet-aluminum","tag-nitrogen-degassing-machine-for-philippines-supplier-aluminium","tag-nitrogen-degassing-machine-for-reynolds-aluminum-philippines","tag-nitrogen-degassing-machine-for-schuco-aluminium-vietnam","tag-nitrogen-degassing-machine-for-t-slot-aluminum-philippines","tag-nitrogen-degassing-machine-for-unicom-aluminum-philippines"],"yoast_head":"<!-- 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