{"id":1017,"date":"2025-09-17T10:25:31","date_gmt":"2025-09-17T08:25:31","guid":{"rendered":"https:\/\/w-platform.fr\/?p=1017"},"modified":"2025-09-18T09:29:17","modified_gmt":"2025-09-18T07:29:17","slug":"loxy-combustion-quand-bruler-a-loxygene-ouvre-la-voie-au-co2-valorisable","status":"publish","type":"post","link":"https:\/\/w-platform.fr\/pt\/2025\/09\/17\/loxy-combustion-quand-bruler-a-loxygene-ouvre-la-voie-au-co2-valorisable\/","title":{"rendered":"Oxicombust\u00e3o: quando a queima com oxig\u00e9nio abre caminho para CO2 valoriz\u00e1vel"},"content":{"rendered":"

Uma nova forma de queimar <\/strong>
Nas centrais el\u00e9tricas ou nas f\u00e1bricas de cimento, os combust\u00edveis s\u00e3o queimados com ar. Mas o ar \u00e9 principalmente azoto (quase 80 %!). Resultado: as fumos cont\u00eam pouco CO\u2082 (10 a 15 % apenas).<\/p>\n\n\n\n

O azoto \u00e9 utilizado como transfer\u00eancia de calor, nomeadamente, n\u00e3o sendo, portanto, in\u00fatil. A combust\u00e3o na presen\u00e7a de N2 provoca a produ\u00e7\u00e3o de \u00f3xidos de azoto que s\u00e3o a origem de polui\u00e7\u00f5es \u00e1cidas. <\/p>\n\n\n\n

A oxicombust\u00e3o altera este esquema: em vez de ar, utiliza-se oxig\u00e9nio quase puro (95\u201399 %), produzido numa unidade de separa\u00e7\u00e3o de ar. Para evitar que a chama se torne demasiado quente, recicla-se uma parte dos fumos j\u00e1 ricos em CO\u2082 e vapor de \u00e1gua.<\/p>\n\n\n\n

Conforme resume Lockwood<\/strong> e os seus colegas em ACS Omega (2023)<\/strong>, este princ\u00edpio \u201cpermite gerar um fluxo de g\u00e1s muito mais simples de tratar, dominado por CO\u2082 e vapor de \u00e1gua\u201d, nomeadamente sem NOx.<\/p>\n\n\n\n

As vantagens da oxicombust\u00e3o<\/strong> <\/p>\n\n\n\n

    \n
  1. Um fluxo de fumos quase isento de azoto<\/strong> 
    Retirando o azoto da equa\u00e7\u00e3o, obtemos gases em que o CO\u2082 representa 70 a 90 % do volume (ap\u00f3s condensa\u00e7\u00e3o da \u00e1gua). <\/li>\n\n\n\n
  2. Uma captura simplificada<\/strong> 
    Numa combust\u00e3o cl\u00e1ssica, s\u00e3o necess\u00e1rios processos dispendiosos para separar o CO\u2082 dilu\u00eddo. Aqui, como diz Toftegaard et al. in <\/strong>Combust\u00edvel<\/em><\/strong> (2010)<\/strong>, \u201ca purifica\u00e7\u00e3o \u00e9 largamente facilitada, o que reduz os custos energ\u00e9ticos da captura\u201d. <\/li>\n\n\n\n
  3. Uma compatibilidade com v\u00e1rios combust\u00edveis<\/strong> 
    A oxicombust\u00e3o foi testada com carv\u00e3o, g\u00e1s natural, biomassa e at\u00e9 em cimento. De acordo com um relat\u00f3rio doIEA Bioenergia (2022)<\/strong>, \u00e9 particularmente promissora em setores dif\u00edceis de descarbonizar, como o cimento ou a siderurgia. <\/li>\n<\/ol>\n\n\n\n

    Abertura para a valoriza\u00e7\u00e3o do CO2  <\/strong> <\/p>\n\n\n\n

    Se a oxicombust\u00e3o suscita tanto interesse, n\u00e3o \u00e9 apenas para captar CO\u2082, mas tamb\u00e9m para o reutilizar<\/strong>. <\/p>\n\n\n\n

    Um fluxo de CO\u2082 concentrado e relativamente puro abre portas a in\u00fameras vias de valoriza\u00e7\u00e3o<\/strong> produ\u00e7\u00e3o de metanol, fabrico de combust\u00edveis sint\u00e9ticos, carbonata\u00e7\u00e3o mineral, ou mesmo alimenta\u00e7\u00e3o de culturas de microalgas. Tal como salientam Artz et al. em <\/strong>Chemical Reviews<\/em><\/strong> (2018)<\/strong>, \u201co CO\u2082 n\u00e3o \u00e9 apenas um g\u00e1s a ser eliminado, \u00e9 um recurso qu\u00edmico que devemos aprender a aproveitar\u201d. <\/p>\n\n\n\n

    Noutros termos, a oxicombust\u00e3o n\u00e3o se limita a tornar a captura mais simples: poder\u00e1 tornar-se um trampolim para uma economia circular do carbono<\/strong>, onde o CO\u2082 libertado ontem se torna a mat\u00e9ria-prima de amanh\u00e3. <\/p>\n\n\n\n

    Nesta perspetiva, Plataforma W<\/strong> contribuiu para promover o desenvolvimento da oxi-combust\u00e3o propondo uma solu\u00e7\u00e3o inovadora que acelera a sua integra\u00e7\u00e3o industrial. <\/p>\n\n\n\n

    Saber mais<\/a><\/em><\/p>\n\n\n\n

    \"\"<\/figure>","protected":false},"excerpt":{"rendered":"

    Uma nova forma de queimar. Nas centrais el\u00e9tricas ou nas cimenteiras, os combust\u00edveis s\u00e3o normalmente queimados com ar. Mas o ar \u00e9, sobretudo, azoto (quase 80 %!). Resultado: as fumagens cont\u00eam pouco CO\u2082 (apenas 10 a 15 %). O azoto \u00e9 utilizado como transferidor de calor, n\u00e3o sendo, por isso, [\u2026]<\/p>","protected":false},"author":1,"featured_media":948,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[22],"tags":[],"class_list":["post-1017","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe-fr"],"aioseo_notices":[],"yoast_head":"\nL\u2019oxy-combustion : quand br\u00fbler \u00e0 l\u2019oxyg\u00e8ne ouvre la voie au CO2 valorisable - W Platform<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/w-platform.fr\/pt\/2025\/09\/17\/loxy-combustion-quand-bruler-a-loxygene-ouvre-la-voie-au-co2-valorisable\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u2019oxy-combustion : quand br\u00fbler \u00e0 l\u2019oxyg\u00e8ne ouvre la voie au CO2 valorisable - W Platform\" \/>\n<meta property=\"og:description\" content=\"Une nouvelle fa\u00e7on de br\u00fbler Dans les centrales \u00e9lectriques ou les usines de ciment, on br\u00fble d\u2019ordinaire les combustibles avec de l\u2019air. Mais l\u2019air, c\u2019est surtout de l\u2019azote (pr\u00e8s de 80 % !). R\u00e9sultat : les fum\u00e9es contiennent peu de CO\u2082 (10 \u00e0 15 % seulement). 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Mais l\u2019air, c\u2019est surtout de l\u2019azote (pr\u00e8s de 80 % !). R\u00e9sultat : les fum\u00e9es contiennent peu de CO\u2082 (10 \u00e0 15 % seulement). 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