Outlet silencer structures for turbine

A combination of a gas turbine intended for installation and use at a stationary site and a sound attenuating duct unit connectable to a hot air exhaust outlet of said gas turbine, said duct unit comprising:

• a housing having a horizontal housing section and a vertical housing section and having sidewalls surrounding a main airflow passageway that extends along a substantial bend, an air inlet located at one end of said horizontal housing section and connectable to said exhaust outlet of the gas turbine, and at least one air outlet located at least proximate to an upper end of said vertical housing section;
• and
• at least two splitters mounted in said housing, said splitters dividing sections of said main airflow passageway into smaller air passageways with at least one of said at least two splitters being positioned downstream in said main airflow passageway relative to at least another of said at least two splitters,
• said splitters containing sound attenuating material selected from a group of materials comprising mineral wool and ceramic fibers and capable of withstanding airflow temperatures in said main airflow passageway of at least 500 degrees Celsius, a layer of a fine stainless steel screen having 200 or more strands per inch being arranged over said sound attenuating material so as to prevent escape of said sound attenuating material into said main airflow passageway,
• wherein at least a substantial portion of both said sidewalls surrounding the main airflow passageway and metal sidewalls forming the splitters are made of perforated sheet metal and said screen is arranged behind the perforated sheet metal of the splitters.

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

• a housing having a horizontal housing section and a vertical housing section and having sidewalls surrounding a main airflow passageway that extends along a substantial bend, an air inlet located at one end of said horizontal housing section and adapted for connection to said outlet of the gas turbine, and two spaced-apart and vertically extending side air outlets located proximate to an upper end of said vertical housing section, said vertical housing section having a top located above said air outlets and adapted to keep rain out of said airflow passageway;
• and
• at least for splitters mounted in said housing, said splitters dividing sections of said main airflow passageway into smaller air passageways with three of said splitters being positioned downstream in said main airflow passageway relative to at least another of said at least four splitters, the three downstream splitters including a central splitter extending along a central longitudinal axis of the vertical housing section and two outer splitters extending along opposite sides of said central splitter and spaced therefrom,
• wherein said splitters contain sound attenuating material capable of withstanding airflow temperatures in said main airflow passageway of at least 500 degrees Celsius and at least a substantial portion of both said sidewalls surrounding the main airflow passageway and metal sidewalls forming said splitters are made of perforated sheet metal.

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

• a housing having exterior walls, perforated metal interior walls forming a main airflow passageway and mounted on and supported by said exterior walls, a hot gas inlet at one end of said housing and adapted for connection to said outlet of the gas turbine, and at least one gas outlet, said main airflow passageway extending between said gas inlet and said at least one gas outlet;
• sound attenuating members mounted within said main airflow passageway and supported therein by said housing;
• sound attenuating material arranged in said housing between said interior walls and said exterior walls and capable of withstanding high airflow temperatures generated at the outlet of said gas turbine during use thereof;
• metal mounting plates having outer edges connected to said exterior walls and inner edges connected to said interior walls;
• spaced-apart connecting pins attached to said mounting plates, projecting from said inner edges, and extending through oversized holes that are larger than the widths of the pins, said holes being formed in said interior walls;
• and an attachment device for movably connecting each connecting pin to a respective one of said interior walls,
• wherein, when said interior walls are heated to an elevated high temperature by operation of said gas turbine, said interior walls are able to expand and move relative to said exterior walls while remaining securely attached to and supported by said exterior walls via said connecting pins and metal mounting plates.

A sound attenuating duct unit suitable for connection to an outlet for hot emission gases produced by a power plant, said duct unit comprising:

• a metal housing formed with side walls containing sound attenuating material capable of withstanding high airflow temperatures and forming a main airflow passageway for said hot emission gases, said housing having a gas inlet at one end of the housing and at least one air outlet at an opposite end of the housing, said airflow passageway extending between said gas inlet and said at least one gas outlet, said side walls of the housing including exterior wall panels and perforated interior wall panels spaced-apart from and supported by the exterior wall panels, said sound attenuating material being sandwiched between said exterior wall panels and the interior panels;
• at least one elongate sound attenuating splitter mounted in said main airflow passageway, extending between and supported by two of said side walls located on opposite sides of said housing, and dividing said main airflow passageway into elongate smaller airflow passageways, the or each splitter containing sound attenuating material and having an exterior constructed with perforated sheet metal;
• and
• splitter mounting devices connecting opposite sides of said at least one splitter directly to the exterior wall panels of said two side walls so as to allow thermal expansion of the at least one splitter when said duct unit is heated up by said hot emission gases during operation of said power plant.

A sound attenuating duct unit suitable for connection to an outlet of a noise creating, gasflow producing device, said duct unit comprising:

• a housing having a horizontal housing section and a vertical housing section and having sound attenuating sidewalls surrounding a main airflow passageway that extends along a substantial bend extending between the two housing sections, a gas inlet located at one end of said horizontal housing section and adapted for connection to said outlet of the gasflow-producing device, and at least one gas outlet located at least proximate to an upper end of said vertical housing section;
• at least one initial, sound attenuating splitter mounted in said housing having an upstream end in the region of said gas inlet, and extending lengthwise around said substantial bend;
• and
• a plurality of spaced-apart, sound attenuating, downstream splitters dividing said main airflow passageway into smaller airflow passageways and arranged side-by-side one another, said downstream splitters being located downstream in the direction of gasflow from said at least one initial splitter and having major lower portions extending in substantially parallel planes that are substantially perpendicular to a central widthwise extending plane defined by an upper end portion of said at least one initial, sound attenuating splitter.