Hello, I need to get tips for supplier of variable orifice located in the Stack of HRSG Boiler (fi=7000mm). The Stack is currently equiped with stack damper (NEM), in further Project,, Plant unit will be connected to the CO2 Capture Plant .To prevent air ingress to the CCC Plant Stack should be equipped with in "1st scenario - closed design" with additional flap but in "2nd scenario - open design" with variable orifice with hole approx. fi=6500mm. Orifice should be able to adjust position to reach the best anti-ingress flow according to phase of operation (Boiler & GT start-up, turning-down, CCC Plant shut down etc.). Could you advice me possible solution & manufacturer?
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Variable Orifice / Damper - experienced
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