{"id":5361,"date":"2021-05-31T11:35:57","date_gmt":"2021-05-31T11:35:57","guid":{"rendered":"https:\/\/cicgroup.com\/nooter-eriksen\/?page_id=5361"},"modified":"2025-10-27T22:57:10","modified_gmt":"2025-10-27T22:57:10","slug":"stack-dampers","status":"publish","type":"page","link":"https:\/\/cicgroup.com\/nooter-eriksen\/aftermarket-services\/component-fabrication-installation\/stack-dampers\/","title":{"rendered":"Stack Dampers"},"content":{"rendered":"\t\t
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Stack Dampers\n<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Stack Dampers\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Adding a stack damper and insulating the HRSG exhaust stack will prolong a site\u2019s ability to maintain hot or warm start conditions.\u00a0 The addition of a damper will also improve reliability by minimizing fatigue damage from cycling associated with cold starts and will improve efficiency by minimizing the heat absorption required to get back to a steady operating temperature during startup.\u00a0 Stack dampers and stack insulation also play a critical role in the effectiveness of steam sparging.<\/p>

There are two primary ways that the stack damper helps keep the heat in the HRSG.\u00a0 One is by reducing the draft flow through the HRSG.\u00a0 While the HRSG is shut down, a draft flows through the CT and HRSG, cooling the coil bundles.\u00a0 As the turbine manufacturers do not provide the effective open area in the turbine, it is assumed that the stack is the restrictive portion of the draft.\u00a0 A closed stack damper restricts the open area in the stack, creating an orifice effect.\u00a0 With less flow passing through the HRSG, less heat is lost, allowing the unit to maintain a hot\/warm start for a longer period.\u00a0 The second way that a damper helps retain heat in the HRSG is by reducing the amount of casing area where heat can be lost.\u00a0 The stack damper is typically located near the elevation of the main platform area, reducing the amount of stack area where heat can be lost.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Stack Insulation\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Heat loss can be further reduced by placing insulation on the outside of the stack and breeching up to the height of the damper.  After shutting down and closing the stack damper, the temperature of the bottled-up exhaust gas will begin to normalize.  Heat will migrate from the HP Evaporator towards the stack.  The stack is made from thin steel and it will be a significant source of heat loss if left uninsCCCCCulated.<\/p>\n<\/div>\n

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Contact us<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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How can we help with your next project? Submit the form below and we\u2019ll reach out.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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