{"id":17578,"count":0,"description":"Fornos rotativos s\u00e3o usados em diversos setores para uma variedade de aplica\u00e7\u00f5es, como secagem, calcina\u00e7\u00e3o, sinteriza\u00e7\u00e3o, queima e processos de aglomera\u00e7\u00e3o nas ind\u00fastrias de ferro e a\u00e7o, cimento, coque, agregados e processamento mineral. Fornos rotativos consistem em uma carca\u00e7a externa cil\u00edndrica de chapa de a\u00e7o carbono calandrada, com pneus de a\u00e7o fundido que rodam sobre rolos de apoio e, geralmente, s\u00e3o acionados por um conjunto de coroa dentada e pinh\u00e3o. O interior da carca\u00e7a normalmente \u00e9 revestido com refrat\u00e1rio para proteger a carca\u00e7a contra danos t\u00e9rmicos, ao mesmo tempo em que evita a perda de calor do processo interno.  \n\nAs temperaturas de chama dentro de um forno rotativo para a ind\u00fastria de cimento podem se aproximar de 2.000 \u00b0C, com temperaturas do cl\u00ednquer chegando a 1.450 \u00b0C, enquanto a carca\u00e7a externa de a\u00e7o \u00e9 mantida abaixo de 350 \u00b0C pelo revestimento. Com temperaturas t\u00e3o altas, algumas partes do forno rotativo s\u00e3o propensas a danos que podem incluir danos estruturais por distor\u00e7\u00e3o, empolamento e poss\u00edveis trincas de fadiga induzidas termicamente na carca\u00e7a, nos pneus e nos rolos de apoio. 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