초록 ▼

Both air duct inlet silencers and air duct outlet silencers for use with a stationary gas turbine are disclosed. The sound attenuating duct unit suitable for connecting to an outlet of a stationary gas turbine includes a housing having a horizontal housing section and a vertical housing section and

Both air duct inlet silencers and air duct outlet silencers for use with a stationary gas turbine are disclosed. The sound attenuating duct unit suitable for connecting to an outlet of a stationary gas turbine includes 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 is located at one end of the horizontal housing section and is adapted for connection to the outlet of the gas turbine. Preferably two air outlets are located proximate to an upper end of the vertical housing section. Splitters are mounted in the housing, and they divide sections of the main airflow passageway into smaller air passageways. At least one of the splitters is positioned upstream in the main airflow passageway relative to other splitters. The splitters contain sound attenuating material capable of withstanding airflow temperatures in the main airflow passageway of at least 500 degrees Celsius. At least a substantial portion of both the sidewalls surrounding the main airflow passageway and metal sidewalls forming the splitters are made of perforated sheet metal.

대표청구항 ▼

1. 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,

1. 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 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 at least two splitters containing sound attenuating material selected from a group of materials comprising ceramic fibers and mineral wool and capable of withstanding airflow temperatures in said main airflow passageway of at least 500 degrees Celsius, said at least two splitters each containing a fine metal screen having 200 or more strands per inch and covering the sound attenuating material, said metal screen being provided to prevent said sound attenuating material from escaping said at least two splitters, wherein 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 having a thickness of at least 12 gauge. 2. A sound attenuating duct unit according to claim 1 wherein sound attenuating material is arranged in said sidewalls surrounding the main airflow passageway and is covered by the perforated sheet metal, which is made of stainless steel, and a layer of fine stainless steel screen is arranged directly behind said perforated sheet metal of said sidewalls to prevent escape of said sound attenuating material through said perforated sheet metal. 3. A sound attenuating duct unit according to claim 1 wherein said perforated sheet metal is made of stainless steel. 4. A sound attenuating duct unit according to claim 1 wherein said at least one of said two splitters extends through a substantial bend from a leading edge thereof to a trailing edge thereof. 5. A sound attenuating duct unit according to claim 1 wherein the horizontal width of said at least one of said splitters is substantially perpendicular to the corresponding horizontal width of said at least another of said splitters. 6. A sound attenuating duct unit according to claim 1 wherein said horizontal housing section includes a duct transition section extending approximately between said air inlet, which is circular, and a transverse, vertical plane located along and extending across said main airflow passageway approximately where a leading edge of said at least another of said splitters is positioned, and wherein the transverse cross-section of said main airflow passageway changes gradually from circular to rectangular in said duct transition section. 7. 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 passagew ay 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. 8. The combination of claim 7 wherein said gas turbine is elongate and has a central longitudinal axis about which blades of the gas turbine rotate during use of the gas turbine, said central longitudinal axis of the gas turbine being substantially horizontal, and wherein both said sidewalls surrounding said main airflow passageway and the metal sidewalls of said splitters are made of perforated stainless steel sheet having a thickness of at least 12 gauge. 9. The combination of claim 7 further comprising a turning vane positioned within said main airflow passageway and above a substantially horizontal portion of said at least another of said splitters, wherein said at least one of said splitters comprises three splitters and said at least another of said splitters is a single curved splitter. 10. 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. 11. A sound attenuating duct unit according to claim 10 further comprising a curved stainless steel turning vane positioned within said main airflow passageway and above a substantially horizontal portion of said at least another of said splitters, wherein said at least another of said splitters is a single splitter. 12. A sound attenuating duct unit according to claim 11 wherein top portions of said three splitters are curved in the direction of airflow so that hot air exiting from said air outlets has a substantial velocity component in both horizontal and vertical directions. 13. A sound attenuating duct unit according to claim 10 wherein each splitter extends widthwise from one sidewall of said housing to an opposite sidewall and the width of said three downstream splitters extends in a horizontal direction tha t is substantially perpendicular to the width of said at least another splitter. 14. 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. 15. A sound attenuating duct unit according to claim 14 wherein said mounting plates are rigidly attached to said exterior walls of the housing. 16. A sound attenuating duct unit according to claim 14 wherein each outer edge of at least some of said metal mounting plates is formed with a two or more spaced-apart recesses in order to reduce the length of contacting edge where the respective mounting plate is connected to its adjacent exterior wall. 17. A sound attenuating duct unit according to claim 15 wherein said connecting pins have threaded inner ends and said attachment device comprises a connecting plate having a hole for receiving the inner end of a respective one of said connecting pins and a nut for attaching said connecting plate to the connecting pin by threaded attachment to the connecting pin. 18. A sound attenuating duct unit according to claim 17 including elongate channel members having a series of further oversized holes formed therein and aligned with respective ones of said oversized holes formed in said interior walls, wherein the connecting pins attached to each mounting plate extend through both the oversized holes in an adjacent one of said interior walls and the aligned further holes of a respective one of said channel members and the attachment devices act to clamp each of said channel members to its respective adjacent interior wall. 19. A sound attenuating duct unit according to claim 14 wherein said housing is constructed from at least three separate sections that are detachably connected together, said three sections including an elbow silencer section having both a horizontal portion and a vertical portion, a lower stack section attached to an upper end of said vertical portion, and an upper stack section attached to an upper end of said lower stack section, said main airflow passageway extending through all three of said separate sections and said hot gas inlet being located at one end of said horizontal portion. 20. A sound attenuating duct unit according to claim 14 wherein said sound attenuating members are splitters dividing said main airflow passageway into smaller airflow passageways and containing sound attenuating material capable of withstanding high airflow temperatures, the exterior of each splitter being made from perforated sheet metal. 21. A sound attenuating duct unit according to claim 20 including splitter mounting devices for connecting each splitter to two of said exterior walls of the housing, wherein said splitter mounting devices for each splitter are connected to the splitter so as to allow thermal expansion of the splitter when the duct unit is heated up by operation of said gas turbine without placement of further stress on the mounting devices. 22. 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. 23. A sound attenuating duct unit according to claim 22 wherein each splitter mounting device comprises a bracket rigidly attached to its respective exterior wall of said housing and having an inwardly projecting tongue, and wherein the or each splitter has side edge plates provided with elongate openings receiving the tongues of the respective brackets for the splitter, each tongue being movable relative to its respective elongate opening upon thermal expansion of the adjacent, attached splitter. 24. A sound attenuating duct unit according to claim 23 wherein there are a plurality of said at least one sound attenuating splitter including three splitters arranged side-by-side forming four of said smaller airflow passageways. 25. A sound attenuating duct unit according to claim 23 wherein there are two of said at least one gas outlet located on opposite vertical sides of said metal housing and said metal housing has a closed top adjacent to the two gas outlets and extending horizontally over the main airflow passageway. 26. A sound attenuating duct unit according to claim 22 wherein said splitter mounting devices project respectively through the adjacent interior wall panels which extend substantially parallel to said exterior wall panels of said two side walls. 27. A sound attenuating duct unit according to claim 26 wherein each splitter mounting device comprises a bracket rigidly attached to a respective adjacent exterior wall panel and having an inwardly projecting tongue that projects through an opening in a respective, adjacent interior wall panel, and wherein the or each splitter has side edge plates forming its opposite side edges and each side edge plate has elongate openings for receiving the tongues of the respective brackets for the splitter, each tongue being movable relative to its respective elongate openings upon thermal expansion of the adjacent attached splitter. 28. A sound attenuating duct unit according to claim 22 wherein there are a plurality of said at lea st one sound attenuating splitter including a first splitter located substantially centrally in said main airflow passageway and having a leading edge in the region of said gas inlet and further splitters located downstream of said first splitter and arranged side-by-side one another. 29. 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. 30. A sound attenuating duct unit according to claim 29 wherein there is only one initial, sound attenuating splitter which is arranged substantially centrally in said main airflow passageway and there are three of said downstream splitters and each of said splitters contains sound attenuating material capable of withstanding gasflow temperatures of at least 500 degrees Celsius. 31. A sound attenuating duct unit according to claim 30 wherein said housing has two gas outlets located at least proximate to said upper end of the vertical housing section and on opposite sides thereof, and said housing has a closed, horizontally extending top. 32. A sound attenuating duct unit according to claim 31 wherein said three downstream splitters include a central downstream splitter and two outer splitters located on opposite sides of said central downstream splitter, and central downstream splitter has a straight major lower portion and an upper portion with a perforated metal exterior that curves upwardly and outwardly to a top of each gas outlet, and each other splitter has a straight major lower portion and an upper portion that curves upwardly and outwardly towards a respective one of said gas outlets. 33. A sound attenuating duct unit according to claim 29 wherein said sound attenuating material is selected from a group of materials comprising mineral wool and ceramic fibers and said sound attenuating material is covered on a side thereof facing the gas flow by a very fine metal screen that prevents erosion of said sound attenuating material. 34. A sound attenuating duct unit according to claim 29 including splitter mounting devices for mounting all of said splitters to said sound attenuating sidewalls of the housing, the mounting devices for each splitter allowing thermal expansion of the respective splitter when said duct unit is heated up by hot emission gases from said gasflow-producing device during operation thereof. 35. A sound attenuating duct unit according to claim 34 wherein said sound attenuating sidewalls include imperforate exterior wall panels, perforated interior wall panels spaced-apart from and supported by the exterior wall panels, and sound attenuating material sandwiched between said exterior wall panels and said interior wall panels, and wherein said splitter mounting devices are rigidly attached to re spective ones of said exterior wall panels and extend through their respective adjacent interior wall panels.