{"id":432,"date":"2022-07-28T18:57:47","date_gmt":"2022-07-28T18:57:47","guid":{"rendered":"https:\/\/environex.com\/?p=432"},"modified":"2022-07-29T14:38:24","modified_gmt":"2022-07-29T14:38:24","slug":"is-your-scr-co-system-ready-for-turndown","status":"publish","type":"post","link":"https:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/","title":{"rendered":"Is Your SCR\/CO System Ready for Turndown?\u00a0Join Environex at CCUG to find out"},"content":{"rendered":"\n<p>Join Environex at the 2022 Combined Cycle Users Group Conference in San Antonio on August 30<sup>th<\/sup> for \u201cIs Your SCR\/CO System Ready for Turndown? How New VOC Emissions Requirements are Increasing NO<sub>2<\/sub>\/NOx and Complicating SCR Operation.\u201d Andy Toback will be presenting.&nbsp;&nbsp;<\/p>\n\n\n\n<p>We will review how higher NO<sub>2<\/sub>\/NOx ratios in exhaust gas increase SCR system performance requirements.&nbsp; NO and NO<sub>2<\/sub> are the primary components of NOx in turbine exhaust.&nbsp; NO<sub>2<\/sub> requires significantly more SCR catalyst activity than NO to achieve the same level of reduction, so higher NO<sub>2<\/sub>\/NOx increases the minimum activity requirement to achieve the required NOx conversion.&nbsp; Field data shows that turndown operation is causing higher NO<sub>2<\/sub>\/NOx out of gas turbines, and systems with CO catalysts can have even higher NO<sub>2<\/sub>\/NOx at the SCR catalyst inlet due to NO to NO<sub>2<\/sub> oxidation across the CO catalyst.&nbsp;&nbsp;<\/p>\n\n\n\n<p>New field data collected by Environex is showing another phenomenon that is causing even higher NO<sub>2<\/sub>\/NOx at the SCR catalyst inlet: lower VOC emissions requirements.\u00a0 Newer systems, along with some retrofits, are being required to reduce VOC emissions to the lowest levels that we have ever seen.\u00a0 VOCs are reduced by being converted to CO<sub>2<\/sub> across the same oxidation catalysts that are used to reduce CO emissions.\u00a0 However, VOCs are much more difficult to oxidize to CO<sub>2<\/sub> than CO is.\u00a0 As a result, oxidation catalysts for these systems are being designed with much more oxidation potential than a standard CO catalyst.\u00a0 While these new oxidation catalyst designs are more effective at reducing VOCs (and highly effective at CO reduction), there is a major unintended consequence: even higher levels of NO to NO<sub>2<\/sub> oxidation, particularly in the temperature range for combined cycle applications.\u00a0\u00a0<\/p>\n\n\n\n<p>The higher NO<sub>2<\/sub>\/NOx at the SCR inlet caused by these highly active oxidation catalysts is creating significant problems for SCR systems.\u00a0 SCR catalyst designs that would normally have sufficient excess activity to provide a normal catalyst lifecycle are failing upon start-up due to the increased minimum activity levels that are imposed by the elevated NO<sub>2<\/sub>\/NOx levels.\u00a0 This presentation will include field data, case studies, and lab test data demonstrating these issues.\u00a0 With this information in hand, plant operators will know what to look out for when specifying SCR and CO catalysts for these systems, as well as ways to mitigate the impact of oxidation catalyst design\/selection on SCR system performance.\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Join Environex at the 2022 Combined Cycle Users Group Conference in San Antonio on August 30th for \u201cIs Your SCR\/CO System Ready for Turndown? How New VOC Emissions Requirements are Increasing NO2\/NOx and Complicating SCR Operation.\u201d Andy Toback will be presenting.&nbsp;&nbsp; We will review how higher NO2\/NOx ratios in exhaust gas increase SCR system performance [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":343,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Is Your SCR\/CO System Ready for Turndown?\u00a0Join Environex at CCUG to find out - Environex<\/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:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Is Your SCR\/CO System Ready for Turndown?\u00a0Join Environex at CCUG to find out - Environex\" \/>\n<meta property=\"og:description\" content=\"Join Environex at the 2022 Combined Cycle Users Group Conference in San Antonio on August 30th for \u201cIs Your SCR\/CO System Ready for Turndown? How New VOC Emissions Requirements are Increasing NO2\/NOx and Complicating SCR Operation.\u201d Andy Toback will be presenting.&nbsp;&nbsp; We will review how higher NO2\/NOx ratios in exhaust gas increase SCR system performance [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/\" \/>\n<meta property=\"og:site_name\" content=\"Environex\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-28T18:57:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-07-29T14:38:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/environex.com\/wp-content\/uploads\/2022\/07\/shutterstock_63475864.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1275\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Joseph Otto\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Joseph Otto\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/\",\"url\":\"https:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/\",\"name\":\"Is Your SCR\/CO System Ready for Turndown?\u00a0Join Environex at CCUG to find out - Environex\",\"isPartOf\":{\"@id\":\"https:\/\/environex.com\/#website\"},\"datePublished\":\"2022-07-28T18:57:47+00:00\",\"dateModified\":\"2022-07-29T14:38:24+00:00\",\"author\":{\"@id\":\"https:\/\/environex.com\/#\/schema\/person\/081e0e09a537e1fd36d7693f75ce1728\"},\"breadcrumb\":{\"@id\":\"https:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/environex.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Is Your SCR\/CO System Ready for Turndown?\u00a0Join Environex at CCUG to find out\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/environex.com\/#website\",\"url\":\"https:\/\/environex.com\/\",\"name\":\"Environex\",\"description\":\"Excellence At the Highest Level\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/environex.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/environex.com\/#\/schema\/person\/081e0e09a537e1fd36d7693f75ce1728\",\"name\":\"Joseph Otto\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/environex.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/ef37c9782bece69b98e62801b4b65c7b?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/ef37c9782bece69b98e62801b4b65c7b?s=96&d=mm&r=g\",\"caption\":\"Joseph Otto\"},\"url\":\"https:\/\/environex.com\/author\/joe-otto\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Is Your SCR\/CO System Ready for Turndown?\u00a0Join Environex at CCUG to find out - Environex","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/environex.com\/uncategorized\/is-your-scr-co-system-ready-for-turndown\/","og_locale":"en_US","og_type":"article","og_title":"Is Your SCR\/CO System Ready for Turndown?\u00a0Join Environex at CCUG to find out - Environex","og_description":"Join Environex at the 2022 Combined Cycle Users Group Conference in San Antonio on August 30th for \u201cIs Your SCR\/CO System Ready for Turndown? 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