{"id":9815,"date":"2021-07-16T09:00:11","date_gmt":"2021-07-16T08:00:11","guid":{"rendered":"https:\/\/vaporparalaindustria.com\/?p=9815"},"modified":"2021-07-19T13:04:27","modified_gmt":"2021-07-19T12:04:27","slug":"valvulas-de-purga-para-el-control-de-tds-automatico","status":"publish","type":"post","link":"https:\/\/vaporparalaindustria.com\/pt\/valvulas-de-purga-para-el-control-de-tds-automatico\/","title":{"rendered":"V\u00e1lvulas de descarga para controle autom\u00e1tico do TDS"},"content":{"rendered":"<p class=\"p1\">Neste artigo vamos falar sobre v\u00e1lvulas de purga para controle autom\u00e1tico do TDS, a fim de continuar com a <a href=\"https:\/\/vaporparalaindustria.com\/pt\/category\/tratamiento-del-agua-para-calderas-de-vapor\/\"><span class=\"s1\"><b>tratamento de \u00e1gua para caldeiras a vapor<\/b><\/span><\/a>. Para come\u00e7ar, vamos olhar para as v\u00e1lvulas de purga cont\u00ednua.<\/p>\n<p class=\"p1\">Na sua forma mais simples, \u00e9 uma v\u00e1lvula de agulha. Vista plana, h\u00e1 um espa\u00e7o anular com:<\/p>\n<ul class=\"ul1\">\n<li class=\"li1\">A circunfer\u00eancia externa definida pelo assento da v\u00e1lvula.<\/li>\n<li class=\"li1\">A circunfer\u00eancia interna definida pela agulha.<span class=\"Apple-converted-space\">\u00a0<\/span><\/li>\n<\/ul>\n<p class=\"p1\">Se for necess\u00e1rio um maior fluxo, a agulha \u00e9 ajustada mais longe do assento e assim o passo entre a agulha e o assento \u00e9 aumentado. Para garantir uma velocidade razo\u00e1vel atrav\u00e9s do orif\u00edcio, o tamanho do orif\u00edcio necess\u00e1rio para o fluxo de purga de 1 111 kg\/h, como mostrado no exemplo mostrado no artigo <a href=\"https:\/\/vaporparalaindustria.com\/pt\/decision-de-los-tds-requeridos-en-el-agua-de-caldera\/\" target=\"_blank\" rel=\"noopener\"><span class=\"s1\"><b>decis\u00e3o sobre o TDS necess\u00e1rio na \u00e1gua da caldeira<\/b><\/span><\/a>seria aproximadamente 3,6 mm.<\/p>\n<p class=\"p1\">Com um di\u00e2metro de assento de v\u00e1lvula de 10 mm, o di\u00e2metro da agulha no ponto onde ela pode fornecer o fluxo necess\u00e1rio de 1 111 kg\/h pode ser calculado da seguinte forma:<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p3\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9817 aligncenter\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico.png\" alt=\"\" width=\"2032\" height=\"794\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-150x59.png 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-300x117.png 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-600x234.png 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-768x300.png 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-800x313.png 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1024x400.png 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1536x600.png 1536w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico.png 2032w\" sizes=\"auto, (max-width: 2032px) 100vw, 2032px\" \/><\/p>\n<p class=\"p1\">Al\u00e9m disso, \u00e9 dif\u00edcil evitar o problema da forma\u00e7\u00e3o de vapor na sede da v\u00e1lvula. A baixa passagem significa que uma mistura vapor\/\u00e1gua flui a alta velocidade perto da superf\u00edcie da agulha e do assento. A eros\u00e3o \u00e9 inevit\u00e1vel, resultando em danos e conseq\u00fcente falha no fechamento.<\/p>\n<p class=\"p1\">As v\u00e1lvulas de purga cont\u00ednua foram desenvolvidas ao longo de muitos anos a partir de v\u00e1lvulas de agulha simples, e agora incorporam uma s\u00e9rie de est\u00e1gios, \u00e0s vezes na forma de tr\u00eas ou quatro sedes progressivamente maiores dentro da v\u00e1lvula, e podem at\u00e9 ter uma passagem helicoidal. O objetivo \u00e9 dissipar a energia gradualmente em etapas e n\u00e3o todas de uma s\u00f3 vez.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p3\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9818 aligncenter\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1.png\" alt=\"\" width=\"2136\" height=\"996\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1-150x70.png 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1-300x140.png 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1-600x280.png 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1-768x358.png 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1-800x373.png 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1-1024x477.png 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1-1536x716.png 1536w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1-2048x955.png 2048w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-1.png 2136w\" sizes=\"auto, (max-width: 2136px) 100vw, 2136px\" \/><\/p>\n<p class=\"p1\">Este tipo de v\u00e1lvula foi originalmente projetado para opera\u00e7\u00e3o manual, e foi equipado com uma escala e um ponteiro acoplado ao man\u00edpulo. Em um ambiente operacional, uma amostra da \u00e1gua da caldeira \u00e9 retirada, o TDS \u00e9 determinado e um ajuste correspondente \u00e9 feito na posi\u00e7\u00e3o da v\u00e1lvula.<\/p>\n<p class=\"p1\">Para acompanhar a tecnologia moderna e as exig\u00eancias do mercado, algumas destas v\u00e1lvulas de drenagem de sal foram equipadas com actuadores el\u00e9ctricos ou pneum\u00e1ticos. No entanto, os problemas fundamentais de pequena passagem, revaporiza\u00e7\u00e3o e eros\u00e3o ainda existem, e os danos na sede da v\u00e1lvula s\u00e3o inevit\u00e1veis. Apesar do uso de um sistema de controle em loop fechado, ainda pode ocorrer um blowdown excessivo.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3 class=\"p4\"><b>V\u00e1lvulas de purga de caldeira Tudo\/Nada (On\/off)<span class=\"Apple-converted-space\">\u00a0<\/span><\/b><\/h3>\n<p class=\"p1\">H\u00e1 a vantagem de utilizar um dispositivo de controle maior com passos maiores, mas s\u00f3 abrindo por um per\u00edodo de tempo. Claramente, isto precisa ser feito com modera\u00e7\u00e3o se o TDS da caldeira for mantido dentro de valores razo\u00e1veis, e os tamanhos mais comuns de v\u00e1lvulas s\u00e3o DN15 e DN20.<\/p>\n<p class=\"p1\">Uma disposi\u00e7\u00e3o t\u00edpica seria programar o controlador para abrir a v\u00e1lvula a 3000 ppm, por exemplo, e depois fechar a v\u00e1lvula a 3000 - 10% = 2 700 ppm. Isto daria um bom equil\u00edbrio entre uma v\u00e1lvula de tamanho razo\u00e1vel e um controle preciso.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p1\">O tipo de v\u00e1lvula selecionada tamb\u00e9m \u00e9 importante:<\/p>\n<ul class=\"ul1\">\n<li class=\"li1\">Para pequenas caldeiras com uma baixa taxa de expans\u00e3o e press\u00f5es abaixo de 10 bar r, uma v\u00e1lvula solen\u00f3ide com capacidade adequada proporcionaria uma solu\u00e7\u00e3o econ\u00f4mica.<\/li>\n<li class=\"li1\">Para caldeiras maiores com taxas de sopro mais elevadas e, claro, caldeiras com press\u00f5es operacionais acima de 10 bar r, \u00e9 necess\u00e1ria uma v\u00e1lvula mais sofisticada para remover o vapor da sede da v\u00e1lvula para evitar danos.<span class=\"Apple-converted-space\">\u00a0<\/span><\/li>\n<\/ul>\n<p class=\"p1\">V\u00e1lvulas deste tipo tamb\u00e9m podem ter um curso ajust\u00e1vel para permitir ao usu\u00e1rio<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p1\">a flexibilidade para selecionar uma taxa de expans\u00e3o adequada \u00e0 caldeira, e qualquer outra<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p1\">equipamento de recupera\u00e7\u00e3o de calor em uso.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p3\"><b><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9819 aligncenter\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2.png\" alt=\"\" width=\"2214\" height=\"1010\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2-150x68.png 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2-300x137.png 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2-600x274.png 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2-768x350.png 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2-800x365.png 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2-1024x467.png 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2-1536x701.png 1536w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2-2048x934.png 2048w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-2.png 2214w\" sizes=\"auto, (max-width: 2214px) 100vw, 2214px\" \/><\/b><\/p>\n<p>&nbsp;<\/p>\n<h3 class=\"p4\"><b>Circuito fechado, sistemas de controle eletr\u00f4nico<span class=\"Apple-converted-space\">\u00a0<\/span><\/b><\/h3>\n<p class=\"p1\">Estes sistemas medem a condutividade da \u00e1gua da caldeira, comparam-na com um ponto de ajuste e abrem uma v\u00e1lvula de controle se o n\u00edvel de TDS for muito alto. Uma variedade de tipos diferentes est\u00e1 dispon\u00edvel no mercado que medem a condutividade dentro da caldeira, ou em uma c\u00e2mara de amostragem externa que \u00e9 purgada em intervalos regulares para obter uma amostra representativa da \u00e1gua da caldeira. A sele\u00e7\u00e3o real depender\u00e1 de fatores como o tipo de caldeira, a press\u00e3o da caldeira e a quantidade de \u00e1gua a ser purgada.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p1\">Estes sistemas s\u00e3o projetados para medir a condutividade da \u00e1gua da caldeira usando uma sonda de condutividade.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p3\"><b><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9820 aligncenter\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3.png\" alt=\"\" width=\"1576\" height=\"1342\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3-150x128.png 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3-300x255.png 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3-600x511.png 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3-705x600.png 705w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3-768x654.png 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3-1024x872.png 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3-1536x1308.png 1536w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2021\/07\/Va\u0301lvulas-de-purga-para-el-control-de-TDS-automa\u0301tico-3.png 1576w\" sizes=\"auto, (max-width: 1576px) 100vw, 1576px\" \/><\/b><\/p>\n<p class=\"p1\">O valor medido \u00e9 comparado com o set point programado no controlador pelo usu\u00e1rio. Se o valor medido for maior que o set point, a v\u00e1lvula de controle de purga abrir\u00e1 at\u00e9 que o set point seja alcan\u00e7ado. Normalmente, o usu\u00e1rio tamb\u00e9m pode ajustar a \"banda morta\".<\/p>\n<p class=\"p1\">Como mencionado acima, um aumento na temperatura da \u00e1gua levar\u00e1 a um aumento na condutividade el\u00e9trica. \u00c9 \u00f3bvio que se uma caldeira est\u00e1 operando numa ampla faixa de temperatura\/press\u00e3o, por exemplo, quando as caldeiras est\u00e3o em um estado de contratempo noturno, ou mesmo uma caldeira com uma ampla faixa de controle do queimador, ent\u00e3o a compensa\u00e7\u00e3o \u00e9 necess\u00e1ria, pois a condutividade \u00e9 o fator de controle.<\/p>\n<p class=\"p1\">Como voc\u00ea est\u00e1 interessado em saber mais sobre v\u00e1lvulas de sopro para controle autom\u00e1tico de TDS na caldeira, <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\"><span class=\"s1\"><b>subscreva a newsletter especializada em sistemas de vapor industrial<\/b><\/span><\/a>um recurso que o ajudar\u00e1 a receber mais conte\u00fado sobre novas tend\u00eancias de vapor, tais como o <a href=\"https:\/\/vaporparalaindustria.com\/pt\/aspectos-clave-del-tratamiento-de-agua-para-calderas-de-vapor\/\" target=\"_blank\" rel=\"noopener\"><span class=\"s1\"><b>aspectos chave do tratamento de \u00e1gua para caldeiras de vapor<\/b><\/span><\/a> ou o que deve ser tido em conta na <a href=\"https:\/\/vaporparalaindustria.com\/pt\/que-tener-en-cuenta-sobre-la-dureza-del-agua-en-calderas-de-vapor\/\" target=\"_blank\" rel=\"noopener\"><span class=\"s1\"><b>dureza da \u00e1gua em caldeiras a vapor<\/b><\/span><\/a>.<\/p>\n<p><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\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6366 size-full\" src=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2017\/05\/CTAnewsletter1900x602spiraxsacro-1-e1494511746325.jpg\" alt=\"calidad del vapor en el proceso industrial\" width=\"1250\" height=\"396\" srcset=\"https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2017\/05\/CTAnewsletter1900x602spiraxsacro-1-e1494511746325-150x48.jpg 150w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2017\/05\/CTAnewsletter1900x602spiraxsacro-1-e1494511746325-300x95.jpg 300w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2017\/05\/CTAnewsletter1900x602spiraxsacro-1-e1494511746325-600x190.jpg 600w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2017\/05\/CTAnewsletter1900x602spiraxsacro-1-e1494511746325-768x243.jpg 768w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2017\/05\/CTAnewsletter1900x602spiraxsacro-1-e1494511746325-800x253.jpg 800w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2017\/05\/CTAnewsletter1900x602spiraxsacro-1-e1494511746325-1024x324.jpg 1024w, https:\/\/vaporparalaindustria.com\/wp-content\/uploads\/2017\/05\/CTAnewsletter1900x602spiraxsacro-1-e1494511746325.jpg 1250w\" sizes=\"auto, (max-width: 1250px) 100vw, 1250px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Neste artigo vamos falar sobre v\u00e1lvulas de sopro para controle autom\u00e1tico de TDS e assim continuar com o tratamento de \u00e1gua para caldeiras de vapor. Para come\u00e7ar, vamos olhar para as v\u00e1lvulas de sopro cont\u00ednuo. Na sua forma mais simples, \u00e9 uma v\u00e1lvula de agulha. Vista plana, h\u00e1 um espa\u00e7o anular com: A circunfer\u00eancia ...<\/p>","protected":false},"author":1,"featured_media":9816,"comment_status":"open","ping_status":"open","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":[107],"tags":[],"class_list":["type-post","category-tratamiento-del-agua-para-calderas-de-vapor","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>V\u00e1lvulas de purga para el control de TDS autom\u00e1tico<\/title>\n<meta name=\"description\" content=\"Existen aspectos clave en el uso de las v\u00e1lvulas de purga para el control de TDS autom\u00e1tico, que forman parte del tratamiento del 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