{"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\/pt\/nitrogen-degassing-machine\/","title":{"rendered":"M\u00e1quina de desgaseifica\u00e7\u00e3o com nitrog\u00eanio"},"content":{"rendered":"

A m\u00e1quina de desgaseifica\u00e7\u00e3o com nitrog\u00eanio \u00e9 utilizada para controlar o teor de hidrog\u00eanio, metais alcalinos e inclus\u00f5es na massa fundida de alum\u00ednio antes da fundi\u00e7\u00e3o.<\/p>\n

Nos \u00faltimos 20 anos, o desgaseifica\u00e7\u00e3o com nitrog\u00eanio<\/a>\u00a0para o alum\u00ednio foi desenvolvida de forma abrangente.<\/p>\n

A solubilidade e os par\u00e2metros que influenciam o hidrog\u00eanio sempre interagem com a atmosfera, formando assim um equil\u00edbrio entre o hidrog\u00eanio gasoso no ar e o hidrog\u00eanio no alum\u00ednio fundido. No entanto, a press\u00e3o parcial (ou teor) de hidrog\u00eanio na atmosfera \u00e9 praticamente irrelevante. Portanto, o hidrog\u00eanio prov\u00e9m do vapor de \u00e1gua presente na atmosfera, que reage facilmente com o alum\u00ednio l\u00edquido para produzir dois produtos de rea\u00e7\u00e3o problem\u00e1ticos, a saber, a alumina (inclus\u00f5es) e o hidrog\u00eanio (g\u00e1s).<\/p>\n

O problema de o alum\u00ednio conter hidrog\u00eanio n\u00e3o se deve ao fato de ele ser particularmente sol\u00favel no alum\u00ednio l\u00edquido, mas sim de ser particularmente insol\u00favel no alum\u00ednio s\u00f3lido; por isso, o hidrog\u00eanio se precipita da solu\u00e7\u00e3o durante a solidifica\u00e7\u00e3o. A m\u00e1quina de desgaseifica\u00e7\u00e3o de alum\u00ednio com nitrog\u00eanio precisa remover o hidrog\u00eanio da massa fundida antes de purg\u00e1-la com g\u00e1s inerte (nitrog\u00eanio).<\/p>\n

\"M\u00e1quina<\/p>\n

Compreender o mecanismo de remo\u00e7\u00e3o do hidrog\u00eanio \u00e9 muito importante para determinar e influenciar os fatores que afetam o melhor m\u00e9todo de remo\u00e7\u00e3o.<\/p>\n

O hidrog\u00eanio at\u00f4mico \u00e9 dissolvido no alum\u00ednio l\u00edquido e distribu\u00eddo uniformemente. Quando as bolhas inertes secas s\u00e3o introduzidas na massa fundida, a press\u00e3o parcial interna do hidrog\u00eanio \u00e9 quase zero. Na bolha de nitrog\u00eanio, estabelece-se rapidamente um equil\u00edbrio local entre a concentra\u00e7\u00e3o de H e a press\u00e3o parcial de H na camada limite de fus\u00e3o. A taxa de difus\u00e3o do hidrog\u00eanio do corpo humano para a camada limite \u00e9 limitada, e a recombina\u00e7\u00e3o do hidrog\u00eanio de \u00e1tomo para mol\u00e9cula \u00e9 muito r\u00e1pida. A concentra\u00e7\u00e3o de hidrog\u00eanio nas bolhas aumenta \u00e0 medida que elas sobem at\u00e9 a superf\u00edcie do metal fundido. A taxa de transfer\u00eancia de hidrog\u00eanio est\u00e1 relacionada n\u00e3o apenas \u00e0 taxa de difus\u00e3o, mas tamb\u00e9m \u00e0 \u00e1rea total da interface da bolha. Um determinado fluxo de g\u00e1s inerte possui uma \u00e1rea de interface maior e pode acomodar bolhas menores.<\/p>\n

Al\u00e9m disso, com a redu\u00e7\u00e3o do n\u00famero de bolhas, o tempo de perman\u00eancia de cada bolha na massa fundida se torna mais longo. Isso ocorre porque a velocidade terminal diminui, o que prolonga o tempo de transporte do hidrog\u00eanio. Zonas de rea\u00e7\u00e3o mais profundas permitem mais tempo para se atingir o equil\u00edbrio, pois as bolhas permanecem na massa fundida por mais tempo antes de chegarem \u00e0 superf\u00edcie. Portanto, o desgaseificador de nitrog\u00eanio para alum\u00ednio precisa produzir o m\u00ednimo poss\u00edvel de bolhas no fundo do recipiente de tratamento.<\/p>\n

Isso \u00e9 alcan\u00e7ado em altas velocidades do rotor. A massa fundida tamb\u00e9m \u00e9 misturada para obter uma distribui\u00e7\u00e3o uniforme do hidrog\u00eanio. O processamento com pistola de pulveriza\u00e7\u00e3o \u00e9 o in\u00edcio da desgaseifica\u00e7\u00e3o industrial, mas a pistola de pulveriza\u00e7\u00e3o geralmente produz grandes bolhas com di\u00e2metros entre 10 e 50 mm. O tamanho das bolhas apresenta uma ampla distribui\u00e7\u00e3o e a homogeneidade da massa fundida \u00e9 limitada. Os tijolos porosos, sejam eles conectados \u00e0 sa\u00edda da lan\u00e7a ou ao fundo do forno, produzem bolhas finas com di\u00e2metro de 10 a 20 mm, mas, mesmo com eles, a homogeneiza\u00e7\u00e3o e a distribui\u00e7\u00e3o das bolhas n\u00e3o s\u00e3o ideais. Por fim, o desenvolvimento do sistema de jato rotativo com rotor resolveu o problema da distribui\u00e7\u00e3o insuficiente de g\u00e1s e proporcionou bolhas com di\u00e2metros na faixa de 3 a 10 mm.<\/p>","protected":false},"excerpt":{"rendered":"

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,…<\/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":"\nNitrogen 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