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Cooling performance of grid-sheets for highly loaded ultra-supercritical steam turbines

Dieter BOHN , Robert KREWINKEL , Shuqing TIAN ,

Frontiers in Energy 2009, Volume 3, Issue 3,   Pages 313-320 doi: 10.1007/s11708-009-0036-7

Abstract: In order to increase efficiency and achieve a further CO-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 grid-sheets 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.

Keywords： steam turbines     700&     deg     C-technology     numerical inverstigation     cooling    

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Development of Heat-Resistant Materials for Advanced USC Power Plants with Steam Temperatures of 700 &deg Review

Fujio Abe

Engineering 2015, Volume 1, Issue 2,   Pages 211-224 doi: 10.15302/J-ENG-2015031

Abstract: Materials-development projects for advanced ultra-supercritical (A-USC) power plants with steam temperatures of 700 &deghighest temperature boiler and turbine components in order to provide sufficient creep strength at 700 &degapplied to the next highest temperature components of an A-USC power plant, up to a maximum of 650 &deg

Keywords： Ni-base alloy     9%&minus     12% Cr steel     creep strength     creep-fatigue property     welded joint     grain boundary     microstructure     &gamma     &prime     M23C6 carbide    

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The 2 °C Global Temperature Target and the Evolution of the Long-Term Goal of Addressing Climate

Yun Gao,Xiang Gao,Xiaohua Zhang

Engineering 2017, Volume 3, Issue 2,   Pages 272-278 doi: 10.1016/J.ENG.2017.01.022

Abstract:

The Paris Agreement proposed to keep the increase in global average temperature to well below 2 °C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5 °CIt was thus the first international treaty to endow the 2 °C global temperature target with legalThe setting of the long-term goal for addressing climate change has been a long process, and the 2 &deg

Keywords： Climate change     International negotiation     Intergovernmental Panel on Climate Change     United Nations Framework Convention on Climate Change     Long-term goal     Critical vulnerability     Intuitive building    

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Title Author Date Type Operation

Cooling performance of grid-sheets for highly loaded ultra-supercritical steam turbines

Dieter BOHN , Robert KREWINKEL , Shuqing TIAN ,

Journal Article

Development of Heat-Resistant Materials for Advanced USC Power Plants with Steam Temperatures of 700 &deg

Fujio Abe

Journal Article

The 2 °C Global Temperature Target and the Evolution of the Long-Term Goal of Addressing Climate

Yun Gao,Xiang Gao,Xiaohua Zhang

Journal Article