{"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\/pt\/degassing-equipment\/","title":{"rendered":"Equipamentos de desgaseifica\u00e7\u00e3o"},"content":{"rendered":"

O equipamento de desgaseifica\u00e7\u00e3o est\u00e1 localizado na linha entre o forno e a esta\u00e7\u00e3o de fundi\u00e7\u00e3o, e sua fun\u00e7\u00e3o \u00e9 remover as impurezas contidas no alum\u00ednio fundido e em suas ligas que afetam sua qualidade e propriedades mec\u00e2nicas. Ele possui as fun\u00e7\u00f5es duplas de processamento e aquecimento. O processo de tratamento selecionado baseia-se no princ\u00edpio da flota\u00e7\u00e3o a g\u00e1s, no qual o g\u00e1s de processo \u00e9 injetado e disperso uniformemente, e min\u00fasculas bolhas fluem para cima dentro do metal fundido. O hidrog\u00eanio \u00e9 absorvido pelas bolhas e eliminado. O metal alcalino reage quimicamente com o g\u00e1s cloro, e as inclus\u00f5es s\u00e3o impedidas de ficarem presas nas bolhas. As maiores colidem entre si e as menores s\u00e3o interceptadas em linha reta. Em seguida, sobem \u00e0 superf\u00edcie do metal fundido para formar esc\u00f3ria.<\/p>\n

O bico rotativo do equipamento de desgaseifica\u00e7\u00e3o desempenha um papel importante no refinamento das bolhas e na dispers\u00e3o dessas bolhas no alum\u00ednio fundido durante a rota\u00e7\u00e3o, mas tamb\u00e9m faz com que a superf\u00edcie do l\u00edquido gire. \u00c0 medida que a velocidade do bico continua a aumentar, forma-se uma zona de press\u00e3o negativa no centro do alum\u00ednio fundido, o que intensifica a absor\u00e7\u00e3o de hidrog\u00eanio, a oxida\u00e7\u00e3o e a inclus\u00e3o de esc\u00f3ria no alum\u00ednio fundido. As p\u00e1s do bico n\u00e3o apenas exercem um efeito de agita\u00e7\u00e3o horizontal sobre o alum\u00ednio fundido, mas tamb\u00e9m fazem com que a mistura de g\u00e1s e l\u00edquido suba. O efeito da pulveriza\u00e7\u00e3o, que intensifica a agita\u00e7\u00e3o do alum\u00ednio fundido. Devido \u00e0 a\u00e7\u00e3o mec\u00e2nica das l\u00e2minas no bico girat\u00f3rio, o alum\u00ednio fundido fica em um estado turbulento, e a for\u00e7a centr\u00edfuga faz com que ele se mova radialmente no bico, enquanto o g\u00e1s \u00e9 pulverizado no alum\u00ednio fundido junto com o fluxo deste.<\/p>\n

Quando a velocidade do bico no equipamento de desgaseifica\u00e7\u00e3o online \u00e9 baixa, o bico exerce um efeito de agita\u00e7\u00e3o reduzido sobre o alum\u00ednio fundido, a turbul\u00eancia do alum\u00ednio fundido \u00e9 baixa e o efeito de fragmenta\u00e7\u00e3o mec\u00e2nica da l\u00e2mina sobre o g\u00e1s \u00e9 pequeno, de modo que o tamanho das bolhas \u00e9 maior; quando a velocidade \u00e9 alta, a turbul\u00eancia do alum\u00ednio fundido \u00e9 elevada. O fluxo se intensifica, a l\u00e2mina exerce um grande efeito de fragmenta\u00e7\u00e3o mec\u00e2nica sobre o g\u00e1s e a for\u00e7a centr\u00edfuga recebida pelo alum\u00ednio l\u00edquido \u00e9 elevada. A bolha se difunde para longe junto com o alum\u00ednio l\u00edquido, a probabilidade de aglomera\u00e7\u00e3o das bolhas \u00e9 baixa e o tamanho das bolhas \u00e9 pequeno. Portanto, considerando o efeito da velocidade de rota\u00e7\u00e3o no refinamento das bolhas e a interfer\u00eancia no alum\u00ednio fundido, a velocidade de rota\u00e7\u00e3o do bico deve ficar em torno de 250 r\/min na produ\u00e7\u00e3o real.<\/p>\n

\"Equipamentos<\/p>\n

As l\u00e2minas do bocal desempenham um papel importante na efici\u00eancia do remo\u00e7\u00e3o de hidrog\u00eanio<\/a>. Ele pode colidir com as bolhas e quebr\u00e1-las, reduzindo assim o tamanho delas. Ao mesmo tempo, utiliza a for\u00e7a centr\u00edfuga para espalhar as bolhas e dispers\u00e1-las uniformemente, reduzindo a probabilidade de fus\u00e3o entre elas e melhorando o efeito de remo\u00e7\u00e3o do hidrog\u00eanio.<\/p>\n

O fluxo de g\u00e1s \u00e9 um par\u00e2metro importante para a desgaseifica\u00e7\u00e3o do hidrog\u00eanio do alum\u00ednio fundido. Para alcan\u00e7ar um determinado efeito de remo\u00e7\u00e3o de hidrog\u00eanio em um banho de fus\u00e3o com capacidade de cerca de 60 t, \u00e9 necess\u00e1rio que haja velocidade de inje\u00e7\u00e3o de g\u00e1s suficiente. Quanto maior o fluxo de g\u00e1s, maior a efici\u00eancia da remo\u00e7\u00e3o de hidrog\u00eanio. No entanto, o fluxo de ar n\u00e3o pode ser aumentado indefinidamente, e o suprimento de ar pode ser ajustado entre 1,5 e 6,5 m\u00b3\/h. Se o fluxo de ar for muito grande, haver\u00e1 um excesso de bolhas na c\u00e2mara de rea\u00e7\u00e3o. Relativamente falando, a quantidade de alum\u00ednio fundido a ser processada se transforma em g\u00e1s, e o tempo de contato com o l\u00edquido \u00e9 reduzido. Ao mesmo tempo, quando o fluxo de ar \u00e9 muito grande, a convec\u00e7\u00e3o superior e inferior do alum\u00ednio l\u00edquido se intensifica, fazendo com que as bolhas fiquem no alum\u00ednio fundido. O tempo de perman\u00eancia no corpo \u00e9 bastante reduzido, diminuindo assim o efeito da remo\u00e7\u00e3o de hidrog\u00eanio.<\/p>\n

Por esse motivo, na produ\u00e7\u00e3o real, a fim de reduzir a influ\u00eancia da convec\u00e7\u00e3o superior e inferior e melhorar a taxa de aproveitamento do g\u00e1s, deve-se evitar, tanto quanto poss\u00edvel, um fluxo excessivo de g\u00e1s. \u00c9 dif\u00edcil melhorar a efici\u00eancia da desgaseifica\u00e7\u00e3o apenas aumentando a vaz\u00e3o do g\u00e1s. A vaz\u00e3o de g\u00e1s deve ser controlada de forma que o n\u00edvel do alum\u00ednio fundido n\u00e3o vire. De acordo com testes de campo, para a liga 6061, a vaz\u00e3o de g\u00e1s \u00e9 de 4 a 4,5 m\u00b3\/h quando a taxa de desgaseifica\u00e7\u00e3o atinge mais de 50% e o alum\u00ednio fundido n\u00e3o vira.<\/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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