Patent ID: 6966172

Claim:
The damper system for a gas turbine exhaust passage, comprising: a gas turbine exhaust passage for discharging exhaust gas of a gas turbine, an exhaust boiler branched from said gas turbine exhaust passage, and a damper provided at a branch portion between said exhaust boiler and said gas turbine exhaust passage, wherein said damper is made of an acoustically transmissive material that may sufficiently transmit a low frequency noise of several tens of Hz or less, wherein said acoustically transmissive material is porous and is disposed from one outermost portion to the other outermost portion of the damper across a thickness direction of the damper, wherein said acoustically transmissive porous material is made of at least one material selected from the group essentially consisting of porous heat insulating material, mesh having a large flow resistance, cloth and film material.