Cooling performance of grid-sheets for highly loaded ultra-supercritical steam turbines
In order to increase efficiency and achieve a further CO 2 -reduction, the next generation of power plant turbines will have steam turbine inlet temperatures that are considerably higher than the current ones. The high pressure steam turbine inlet temperature is expected to be increased up to approx...
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Published in | Frontiers in Energy Vol. 3; no. 3; pp. 313 - 320 |
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Format | Journal Article |
Language | English |
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01.09.2009
Springer Nature B.V |
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Abstract | In order to increase efficiency and achieve a further CO
2
-reduction, the next generation of power plant turbines will have steam turbine inlet temperatures that are considerably higher than the current ones. The high pressure steam turbine inlet temperature is expected to be increased up to approximately 700°C with a live steam pressure of 30 MPa. The elevated steam parameters in the high and intermediate pressure turbines can be encountered with Ni-base alloys, but this is a costly alternative associated with many manufacturing difficulties. Collaborative research centre 561 “Thermally Highly Loaded, Porous and Cooled Multi-Layer Systems for Combined Cycle Power Plants” at RWTH Aachen University proposes cooling the highly loaded turbines instead, as this would necessitate the application of far less Ni-base alloys.
To protect the thermally highly loaded components, a sandwich material consisting of two thin face sheets and a core made from a woven wire mesh is used to cover the walls of the steam turbine casing. The cooling steam is led through the woven wire mesh between the two face sheets to achieve a cooling effect. The wire mesh provides the grid-sheet with structural rigidity under varying operating conditions.
In the present work, the cooling performance of the gridsheets will be investigated applying the conjugate heat transfer method to ultra-supercritical live and cooling steam conditions for a section of the cooling structure. The behaviour of the flow and the heat transfer in the grid-sheet will be analyzed in detail using a parameter variation. The numerical results should give a first prediction of the cooling performance under future operating conditions. |
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AbstractList | In order to increase efficiency and achieve a further CO2-reduction, the next generation of power plant turbines will have steam turbine inlet temperatures that are considerably higher than the current ones. The high pressure steam turbine inlet temperature is expected to be increased up to approximately 700°C with a live steam pressure of 30 MPa. The elevated steam parameters in the high and intermediate pressure turbines can be encountered with Ni-base alloys, but this is a costly alternative associated with many manufacturing difficulties. Collaborative research centre 561 "Thermally Highly Loaded, Porous and Cooled Multi-Layer Systems for Combined Cycle Power Plants" at RWTH Aachen University proposes cooling the highly loaded turbines instead, as this would necessitate the application of far less Ni-base alloys. To protect the thermally highly loaded components, a sandwich material consisting of two thin face sheets and a core made from a woven wire mesh is used to cover the walls of the steam turbine casing. The cooling steam is led through the woven wire mesh between the two face sheets to achieve a cooling effect. The wire mesh provides the grid-sheet with structural rigidity under varying operating conditions. In the present work, the cooling performance of the gridsheets will be investigated applying the conjugate heat transfer method to ultra-supercritical live and cooling steam conditions for a section of the cooling structure. The behaviour of the flow and the heat transfer in the grid-sheet will be analyzed in detail using a parameter variation. The numerical results should give a first prediction of the cooling performance under future operating conditions. In order to increase efficiency and achieve a further CO 2 -reduction, the next generation of power plant turbines will have steam turbine inlet temperatures that are considerably higher than the current ones. The high pressure steam turbine inlet temperature is expected to be increased up to approximately 700°C with a live steam pressure of 30 MPa. The elevated steam parameters in the high and intermediate pressure turbines can be encountered with Ni-base alloys, but this is a costly alternative associated with many manufacturing difficulties. Collaborative research centre 561 “Thermally Highly Loaded, Porous and Cooled Multi-Layer Systems for Combined Cycle Power Plants” at RWTH Aachen University proposes cooling the highly loaded turbines instead, as this would necessitate the application of far less Ni-base alloys. To protect the thermally highly loaded components, a sandwich material consisting of two thin face sheets and a core made from a woven wire mesh is used to cover the walls of the steam turbine casing. The cooling steam is led through the woven wire mesh between the two face sheets to achieve a cooling effect. The wire mesh provides the grid-sheet with structural rigidity under varying operating conditions. In the present work, the cooling performance of the gridsheets will be investigated applying the conjugate heat transfer method to ultra-supercritical live and cooling steam conditions for a section of the cooling structure. The behaviour of the flow and the heat transfer in the grid-sheet will be analyzed in detail using a parameter variation. The numerical results should give a first prediction of the cooling performance under future operating conditions. In order to increase efficiency and achieve a further CO sub(2)-reduction, the next generation of power plant turbines will have steam turbine inlet temperatures that are considerably higher than the current ones. The high pressure steam turbine inlet temperature is expected to be increased up to approximately 700 degree C with a live steam pressure of 30 MPa. The elevated steam parameters in the high and intermediate pressure turbines can be encountered with Ni-base alloys, but this is a costly alternative associated with many manufacturing difficulties. Collaborative research centre 561 'Thermally Highly Loaded, Porous and Cooled Multi-Layer Systems for Combined Cycle Power Plants' at RWTH Aachen University proposes cooling the highly loaded turbines instead, as this would necessitate the application of far less Ni-base alloys. To protect the thermally highly loaded components, a sandwich material consisting of two thin face sheets and a core made from a woven wire mesh is used to cover the walls of the steam turbine casing. The cooling steam is led through the woven wire mesh between the two face sheets to achieve a cooling effect. The wire mesh provides the grid-sheet with structural rigidity under varying operating conditions. In the present work, the cooling performance of the gridsheets will be investigated applying the conjugate heat transfer method to ultra-supercritical live and cooling steam conditions for a section of the cooling structure. The behaviour of the flow and the heat transfer in the grid-sheet will be analyzed in detail using a parameter variation. The numerical results should give a first prediction of the cooling performance under future operating conditions. |
Author | Krewinkel, Robert Bohn, Dieter Tian, Shuqing |
Author_xml | – sequence: 1 givenname: Dieter surname: Bohn fullname: Bohn, Dieter email: post-bohn@idg.rwth-aachen.de organization: Institute of Steam and Gas Turbines, RWTH Aachen University – sequence: 2 givenname: Robert surname: Krewinkel fullname: Krewinkel, Robert organization: Institute of Steam and Gas Turbines, RWTH Aachen University – sequence: 3 givenname: Shuqing surname: Tian fullname: Tian, Shuqing organization: Institute of Steam and Gas Turbines, RWTH Aachen University |
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Cites_doi | 10.2514/6.1985-122 10.2514/6.1978-257 10.1007/978-3-662-03529-0_3 10.1115/GT2002-30210 10.1016/j.commatsci.2004.05.003 10.1115/GT2005-68148 10.1299/jsmeb.41.734 10.2514/6.1990-390 |
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Snippet | In order to increase efficiency and achieve a further CO
2
-reduction, the next generation of power plant turbines will have steam turbine inlet temperatures... In order to increase efficiency and achieve a further CO2-reduction, the next generation of power plant turbines will have steam turbine inlet temperatures... In order to increase efficiency and achieve a further CO sub(2)-reduction, the next generation of power plant turbines will have steam turbine inlet... |
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StartPage | 313 |
SubjectTerms | Alloys Carbon dioxide Cooling Energy Energy Systems Gases Geometry Heat transfer High pressure Numerical analysis Power plants Research Article Rigidity Steam power Steam pressure Steam turbines Studies Turbines Wire |
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Title | Cooling performance of grid-sheets for highly loaded ultra-supercritical steam turbines |
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