In a combined cycle power plant, the bypass stack is typically larger in diameter than the main stack for several reasons: For stack need, pls contact: ybchimney@gmail.com www.industrychimney.net Flow requirements: The bypass stack needs to handle a larger volume of exhaust gases than the main stack, as it is designed to bypass the heat recovery steam generator (HRSG) during startup, shutdown, and low-load operation. During these periods, the exhaust gases from the gas turbine bypass the HRSG and are discharged directly to the atmosphere through the bypass stack. Therefore, the bypass stack needs to have a larger diameter to accommodate the higher flow rate of exhaust gases. Pressure drop: The bypass stack needs to maintain a lower pressure drop than the main stack to prevent the gas turbine from experiencing excessive back pressure during startup, shutdown, and low-load operation. A larger diameter bypass stack can reduce the pressure drop by allowing the exhaust gases to ...
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