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NEM Energy - Stack Dampers
The primary function of an HRSG stack damper is to slow down the cooling rate of the HRSG between gas turbine starts. By minimizing the dwell time necessary for HRSG restart, thermal stresses for pressure parts of the HRSG are reduced, resulting in an increased life time.
Stack dampers also prevent rain from entering the HRSG during sustained shutdowns. The most advanced stack damper design incorporates aerodynamic aspects and an improved drive system, which provides independent overpressure relief on the blades in case of process upsets.
NEM Energy stack dampers for HRSGs come in standardized, parametric 2-blade- or individual 4-blade designs. The dampers can also be retrofitted to existing HRSG stacks relatively quick and easy, utilizing either the complete damper configuration with frame or the Stack Damper Retrofit Kit.