{"id":7979,"date":"2019-01-18T09:00:45","date_gmt":"2019-01-18T08:00:45","guid":{"rendered":"https:\/\/vaporparalaindustria.com\/?p=7979"},"modified":"2022-03-24T13:12:23","modified_gmt":"2022-03-24T12:12:23","slug":"lazos-de-control-para-sistemas-de-vapor-parte-1","status":"publish","type":"post","link":"https:\/\/vaporparalaindustria.com\/pt\/lazos-de-control-para-sistemas-de-vapor-parte-1\/","title":{"rendered":"Circuitos de controle para sistemas de vapor (Parte 1)"},"content":{"rendered":"<p><em><span style=\"font-weight: 400;\">Antes de falar em loops de controle para sistemas de vapor, \u00e9 necess\u00e1rio mencionar que eles fazem parte de sistemas de controle completos, consistindo de uma v\u00e1lvula, um atuador, um sensor, um controlador e finalmente a din\u00e2mica do pr\u00f3prio processo.<\/span><\/em><\/p>\n<h4><span style=\"font-weight: 400;\">Na verdade, a <\/span><b>sistemas completos de controle<\/b><span style=\"font-weight: 400;\"> pode ser dividido em:<\/span><\/h4>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Controle de circuito aberto<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Controlo em malha fechada<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Controle de feedback<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Controle com fornecimento direto de dist\u00farbios<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Controle de loop \u00fanico<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Controle multi-loop para sistemas de vapor<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Controle em cascata<\/span><\/li>\n<\/ul>\n<h3><\/h3>\n<h3><b>Controle de circuito aberto<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">O primeiro dos loops de controle para sistemas de vapor \u00e9 o controle em malha aberta, o que significa apenas que n\u00e3o h\u00e1 feedback direto da condi\u00e7\u00e3o controlada; em outras palavras, nenhuma informa\u00e7\u00e3o \u00e9 enviada pelo processo ou sistema sob controle para indicar que tudo \u00e9 satisfat\u00f3rio ou que alguma a\u00e7\u00e3o corretiva \u00e9 necess\u00e1ria.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A figura acima mostra um sistema de aquecimento muito simples usando um sensor fora da sala a ser aquecida. O sistema aqui mostrado n\u00e3o \u00e9 um exemplo pr\u00e1tico de um <\/span><b>sistema de controlo de aquecimento<\/b><span style=\"font-weight: 400;\">N\u00f3s simplesmente o usamos para descrever o princ\u00edpio do controle em circuito aberto.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">O sistema consiste em um controlador proporcional com um sensor de detec\u00e7\u00e3o de temperatura ambiente. O controlador pode ser configurado com uma banda proporcional bastante larga, de modo que, a uma temperatura ambiente de -1\u00b0C, a v\u00e1lvula esteja totalmente aberta, e a uma temperatura ambiente de 19\u00b0C, a v\u00e1lvula esteja totalmente fechada. Como a temperatura ambiente ter\u00e1 um efeito sobre a perda de calor do edif\u00edcio, espera-se que controle a temperatura ambiente.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No entanto, n\u00e3o h\u00e1 feedback sobre a temperatura ambiente e o aquecimento devido a outros factores. Em clima ameno, mesmo que o fluxo de \u00e1gua seja controlado, o sobreaquecimento da sala ocorrer\u00e1 inevitavelmente. Em outras palavras, um controle em malha aberta fornece apenas um controle grosseiro da aplica\u00e7\u00e3o.<\/span><\/p>\n<p><a href=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-7980\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3.png\" alt=\"Lazos de control para sistemas de vapor (3)\" width=\"1200\" height=\"500\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3-150x63.png 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3-300x125.png 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3-600x250.png 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3-768x320.png 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3-800x333.png 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3-1024x427.png 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-3.png 1200w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">A figura acima mostra um sistema de controle um pouco mais sofisticado com dois sensores. O sistema utiliza um <\/span><b>v\u00e1lvula misturadora de tr\u00eas vias<\/b><span style=\"font-weight: 400;\"> com um atuador, um controlador e um sensor externo, mais um sensor de temperatura na linha de \u00e1gua. O sensor de temperatura externa fornece um set point remoto na entrada do controlador, que \u00e9 usado para o offset do set point de temperatura da \u00e1gua. Desta forma, o controle em circuito fechado \u00e9 aplicado \u00e0 temperatura da \u00e1gua que circula atrav\u00e9s dos radiadores.<\/span><\/p>\n<blockquote><p><span style=\"font-weight: 400;\">Quando est\u00e1 frio no exterior, a \u00e1gua flui atrav\u00e9s do radiador \u00e0 sua temperatura m\u00e1xima. \u00c0 medida que a temperatura exterior aumenta, o controlador reduzir\u00e1 automaticamente a temperatura da \u00e1gua que flui atrav\u00e9s dos radiadores.<\/span><\/p><\/blockquote>\n<p><span style=\"font-weight: 400;\">No entanto, no que diz respeito \u00e0 temperatura ambiente, este ainda \u00e9 um controlo em circuito aberto, uma vez que n\u00e3o h\u00e1 feedback de informa\u00e7\u00e3o do edif\u00edcio ou do espa\u00e7o a ser aquecido. Se os radiadores tiverem sido sobredimensionados ou se tiverem ocorrido erros de concep\u00e7\u00e3o, o sobreaquecimento ainda ocorre.<\/span><\/p>\n<p><a href=\"https:\/\/koi-3QNKZ0D2AO.marketingautomation.services\/net\/m?md=PtF9rC%2FJvh%2F%2FhVAdM%2BhFp14wWXTZ2klk\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-9782 size-full\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL.png\" alt=\"\" width=\"2521\" height=\"1018\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL-150x61.png 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL-300x121.png 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL-600x242.png 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL-768x310.png 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL-800x323.png 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL-1024x413.png 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL-1536x620.png 1536w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL-2048x827.png 2048w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/CTA-SOLICITAR-INFORMACIO\u0301N-VALVULAS-DE-CONTROL.png 2521w\" sizes=\"auto, (max-width: 2521px) 100vw, 2521px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h3><b>Controlo em malha fechada <\/b><\/h3>\n<p><span style=\"font-weight: 400;\">O controle em malha fechada \u00e9 o segundo dos la\u00e7os de controle para sistemas de vapor e requer feedback; informa\u00e7\u00f5es enviadas diretamente do processo ou sistema. Usando o sistema de aquecimento simples mostrado na figura abaixo, um sensor de temperatura \u00e9 adicionado no espa\u00e7o interior, detecta a temperatura ambiente e proporciona um controle em circuito fechado em rela\u00e7\u00e3o \u00e0 sala.<\/span><\/p>\n<p><a href=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-7981\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor.png\" alt=\"Lazos de control para sistemas de vapor\" width=\"1200\" height=\"500\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-150x63.png 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-300x125.png 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-600x250.png 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-768x320.png 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-800x333.png 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor-1024x427.png 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/01\/Lazos-de-control-para-sistemas-de-vapor.png 1200w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Como pode ser visto na figura acima, a v\u00e1lvula e o atuador s\u00e3o controlados por um sensor de temperatura localizado na sala, que fornece informa\u00e7\u00f5es sobre a temperatura real da sala.<\/span><\/p>\n<blockquote><p>Perturba\u00e7\u00f5es s\u00e3o fatores que entram no processo ou sistema a fim de desalinhar o valor do meio controlado. Estes dist\u00farbios podem ser causados por altera\u00e7\u00f5es na carga ou por influ\u00eancias externas. Se uma sala \u00e9 subitamente cheia de pessoas, estas pessoas constituem uma perturba\u00e7\u00e3o, pois afectam a temperatura da sala e a quantidade de calor necess\u00e1ria para manter a temperatura desejada.<\/p><\/blockquote>\n<h3><\/h3>\n<h3><b>Controle de feedback<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Este \u00e9 outro tipo de controle em circuito fechado. O controle de feedback leva em conta os dist\u00farbios e envia esta informa\u00e7\u00e3o ao controlador, para permitir a tomada de medidas corretivas. Por exemplo, se um grande n\u00famero de pessoas entra numa sala, a temperatura da sala aumenta, fazendo com que o sistema de controle reduza a entrada de calor na sala.<\/span><\/p>\n<p><a href=\"https:\/\/koi-3QNKZ0D2AO.marketingautomation.services\/net\/m?md=ZmkHbNtvWeUlu%2BCRWSYKby%2FCuH3FwLAp\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-9780 size-full\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL.jpg\" alt=\"\" width=\"2522\" height=\"1092\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL-150x65.jpg 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL-300x130.jpg 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL-600x260.jpg 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL-768x333.jpg 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL-800x346.jpg 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL-1024x443.jpg 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL-1536x665.jpg 1536w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL-2048x887.jpg 2048w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2019\/05\/CTA-DOSSIER-TE\u0301CNICO-VALVULAS-DE-CONTROL.jpg 2522w\" sizes=\"auto, (max-width: 2522px) 100vw, 2522px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h3><b>Controle com fornecimento direto de dist\u00farbios <\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Com a alimenta\u00e7\u00e3o directa da perturba\u00e7\u00e3o, os efeitos da perturba\u00e7\u00e3o s\u00e3o antecipados e podem ser antecipados. Um exemplo disso seria levar uma caldeira ao m\u00e1ximo antes de colocar em funcionamento uma planta de processo com uso intensivo de vapor.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Poder\u00edamos ver a sequ\u00eancia de eventos de comissionamento de uma planta de processo. Esta ac\u00e7\u00e3o, em vez de abrir a v\u00e1lvula de vapor ao processo, enviar\u00e1 o m\u00e1ximo de instru\u00e7\u00f5es de inc\u00eandio para o queimador da caldeira. Somente quando a posi\u00e7\u00e3o m\u00e1xima de inc\u00eandio for atingida ser\u00e1 permitido abrir a v\u00e1lvula de vapor para o processo, de forma lenta e controlada.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Se voc\u00ea quiser saber mais sobre la\u00e7os de controle para sistemas de vapor, por favor veja o <\/span><a href=\"https:\/\/vaporparalaindustria.com\/pt\/control-multilazo-para-sistemas-de-vapor-parte-2\/\" target=\"_blank\" rel=\"noopener noreferrer\"><b>controle multi-loop para sistemas de vapor <\/b><\/a><span style=\"font-weight: 400;\">e controlo em cascata. Al\u00e9m disso, para detalhes sobre o <\/span><a href=\"https:\/\/vaporparalaindustria.com\/pt\/modo-de-control-en-continuo-para-sistemas-de-vapor\/\" target=\"_blank\" rel=\"noopener noreferrer\"><b>modo de controle cont\u00ednuo para sistemas de vapor<\/b><\/a><span style=\"font-weight: 400;\">subscreva o <\/span><a href=\"https:\/\/vaporparalaindustria.com\/pt\/newsletter\/?utm_source=newsletter&amp;utm_medium=cta_vapor&amp;utm_campaign=vapor_cta_newsletter\" target=\"_blank\" rel=\"noopener noreferrer\"><b>Boletim Informativo Steam for Industry<\/b><\/a><span style=\"font-weight: 400;\">O conte\u00fado mais recente sobre as novas tend\u00eancias em vapor industrial est\u00e1 dispon\u00edvel para voc\u00ea como um recurso.<\/span><\/p>\n<p><a href=\"https:\/\/www.natural-technology.com\/es\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-26532 size-full\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR.jpg\" alt=\"\" width=\"2500\" height=\"1311\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-18x9.jpg 18w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-150x79.jpg 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-300x157.jpg 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-600x315.jpg 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-768x403.jpg 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-800x420.jpg 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-1024x537.jpg 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-1536x805.jpg 1536w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR-2048x1074.jpg 2048w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2022\/03\/CTA-SPIRAX-NATURAL-TECHNOLOGY-RECTANGULAR.jpg 2500w\" sizes=\"auto, (max-width: 2500px) 100vw, 2500px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Antes de falar em loops de controle para sistemas de vapor, \u00e9 necess\u00e1rio mencionar que eles fazem parte de sistemas de controle completos, consistindo de uma v\u00e1lvula, um atuador, um sensor, um controlador e finalmente a din\u00e2mica do pr\u00f3prio processo. Na verdade, os sistemas de controle completos podem ser divididos em: ...<\/p>","protected":false},"author":1,"featured_media":7982,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[67,76],"tags":[],"class_list":["type-post","category-optimizacion-de-sistemas-de-vapor","category-valvulas-de-control","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lazos de control para sistemas de vapor (Parte 1)<\/title>\n<meta name=\"description\" content=\"Entre los lazos de control para sistemas de vapor est\u00e1 el control de lazo abierto, en el cual no hay realimentaci\u00f3n 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