Outlet silencer and heat recovery structures for gas turbine

A sound attenuating duct unit suitable for connection to an outlet of a stationary gas turbine, said duct unit comprising:

• a duct housing having exterior sides, an air inlet in one end of said housing that lies in a first plane, and first and second air outlets with said first air outlet located in one of said exterior sides of said housing spaced from said one end and said second air outlet located in another of said exterior sides that extends in a second plane arranged at a substantial angle to said
• first plane, said air inlet being adapted for connection to said outlet of said gas turbine in order to receive hot air flow from said gas turbine,
• interior walls arranged in said housing and defining sidewalls of a main airflow passageway which extends from said air inlet to both of said first and second outlets;
• sound absorbing and thermal insulation material arranged between said interior walls and said exterior sides of said duct housing;
• a series of sound absorbing splitters rigidly mounted in said airflow passageway and extending transversely from one side of said main airflow passageway to an opposite side thereof, said splitters dividing said main airflow passageway into smaller passageways and containing sound attenuating material capable of withstanding high temperatures of gas turbine exhaust air, said splitters being made of perforated sheet metal having a thickness of at least 12 gauge;
• and
• a diverter damper mounted in said duct housing and movable between a first position where said damper directs the hot air flow to said first air outlet and a second position where said damper directs said hot air flow to said second air outlet;
• wherein said series of splitters is mounted between said diverter damper and said air inlet so that hot air flow exiting from said smaller air passageways flows to a selected one of said first and second air outlets.