{"id":11193,"date":"2021-11-13T08:31:01","date_gmt":"2021-11-13T08:31:01","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11193"},"modified":"2021-11-12T08:35:37","modified_gmt":"2021-11-12T08:35:37","slug":"deep-bed-device","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/deep-bed-device\/","title":{"rendered":"Dispositivo de leito profundo"},"content":{"rendered":"

Atualmente, o dispositivo de filtragem com placas cer\u00e2micas \u00e9 o mais utilizado, mas sua aplica\u00e7\u00e3o independente em produtos de alta tecnologia apresenta maiores limita\u00e7\u00f5es. Geralmente, o dispositivo de filtragem com placas cer\u00e2micas precisa ser combinado com outros dispositivos de filtragem, como os de leito profundo ou os tubulares. Os dispositivos de filtragem tubulares e de leito profundo s\u00e3o amplamente utilizados em produtos de processamento de alum\u00ednio de alta qualidade e ocupam a maior parte do mercado industrializado de purifica\u00e7\u00e3o de alum\u00ednio fundido de alta qualidade.<\/p>\n

Embora o filtro de leito profundo e o filtro cer\u00e2mico de espuma<\/a> Embora tenham estruturas diferentes, o mecanismo de intercepta\u00e7\u00e3o e captura de part\u00edculas de impureza \u00e9 basicamente o mesmo.<\/p>\n

Os filtros tubulares podem remover impurezas, principalmente nas quatro situa\u00e7\u00f5es a seguir:<\/p>\n

Intercepta\u00e7\u00e3o direta. Quando o tamanho das part\u00edculas de impureza \u00e9 maior do que o tamanho dos poros do meio filtrante, elas s\u00e3o impedidas de entrar nos poros e, assim, s\u00e3o retidas.
\nA for\u00e7a inercial faz com que as part\u00edculas de impureza se desviem da dire\u00e7\u00e3o do fluxo do fluido; elas s\u00e3o atra\u00eddas pela parede fina do poro do meio filtrante e ficam retidas.
\nAs part\u00edculas de impureza realizam um movimento browniano irregular na massa fundida. Quando colidem com o meio filtrante, s\u00e3o adsorvidas por ele e permanecem ali.
\nAs part\u00edculas de impurezas s\u00e3o depositadas pela a\u00e7\u00e3o da gravidade e retidas na parede do meio filtrante.
\nAs vantagens dos dispositivos de filtragem de leito profundo s\u00e3o a espessura da camada filtrante, o longo percurso do fluxo e a grande quantidade de part\u00edculas de impurezas adsorvidas. A vaz\u00e3o \u00e9 elevada, chegando a 5-100 t\/h, o que os torna adequados para produ\u00e7\u00e3o em grande escala e em massa.<\/p>\n

\"\"<\/p>\n

O dispositivo de filtragem de leito profundo \u00e9 composto por v\u00e1rias camadas de esferas de alumina (com cerca de 15 mm de di\u00e2metro) e uma camada de cascalho de 6,68 a 3,327 mm. A sele\u00e7\u00e3o do tamanho das part\u00edculas do material filtrante e a distribui\u00e7\u00e3o das diferentes camadas desempenham um papel fundamental na otimiza\u00e7\u00e3o da efici\u00eancia de filtragem e no prolongamento da vida \u00fatil do filtro. A entrada possui um leito filtrante apoiado por uma grade, e a capacidade do recipiente fechado pode ser controlada na faixa de 5 a 100 t\/h, de acordo com as necessidades; a vaz\u00e3o projetada \u00e9 de 5 a 100 t\/h.<\/p>\n

Antes do enchimento com metal l\u00edquido, o leito filtrante deve atingir uma temperatura adequada para garantir que n\u00e3o haja solidifica\u00e7\u00e3o no leito filtrante. Ar seco ou outro g\u00e1s inerte \u00e9 circulado para pr\u00e9-aquecer o leito filtrante. O g\u00e1s \u00e9 enviado para a tampa, onde o ar \u00e9 aquecido a alta temperatura pela fio de resist\u00eancia presente na tampa; em seguida, \u00e9 direcionado para o leito filtrante e, atrav\u00e9s do tubo, para a sa\u00edda. A temperatura de pr\u00e9-aquecimento \u00e9 monitorada por um termopar.<\/p>\n

Quando o leito filtrante atinge a temperatura adequada para o carregamento, a opera\u00e7\u00e3o inicial de enchimento consiste em enviar o alum\u00ednio l\u00edquido para a camada plana do leito filtrante por meio do tubo de entrada e obter o fluxo laminar necess\u00e1rio com a vaz\u00e3o adequada do alum\u00ednio l\u00edquido. Ele \u00e9 distribu\u00eddo uniformemente na parte inferior do leito filtrante e, em seguida, passa lentamente pelo leito at\u00e9 a superf\u00edcie.<\/p>","protected":false},"excerpt":{"rendered":"

At present, the most widely used ceramic plate filter device, but its independent application in high-end products has greater limitations. 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