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WIP-August 2011.pdf - Global Media Publishing Ltd. - Uk.com

WIP-August 2011.pdf - Global Media Publishing Ltd. - Uk.com

STEAM TURBINES Steam

STEAM TURBINES Steam turbines - what makes the quintessential system? A summary of advanced 800+ MW Steam Powerplants and future CCS options reveals that ultrasupercritical steam parameters, optimised key plant components and processes are prerequisites for high overall plant efficiencies and low emissions, reports Siemens. Ultra supercritical (USC) steam power plants are not only highly efficient when it comes to reducing both fuel costs and emissions, they provide a reliable supply of electric energy at low cost, reports Siemens. Siemens claims extensive experience with ultra supercritical steam turbines and continues to optimise associated designs and technologies in order to achieve highest efficiency and to fulfill CO2 requirements. Modularised reference power plants - marketed as SSP5- 6000 (50 Hz) and SSP6- 6000 (60 Hz) series - have been successfully built worldwide and now provide for the needs of the European coal-fired power plant market. An advanced ultra supercritical 800 MW steam power plant based on the SSP5- 6000 (1x800 USC) reference plant is currently under construction in Lünen, Germany and will come online in Autumn 2012. Siemens’ scope of supply for steam power plants covers the full range from component packages to engineering, procurement and construction (EPC) of turnkey Siemens Steam Plants (SSP). Smaller supercritical or subcritical steam power plants (>300 MWgross) can also be provided. The SSP Turbine Island relies on a reasonable scope split and clearlydefined interfaces with the Boiler Island and balance of plant (BOP). Lünen is a good example of the SSP5-6000 (1x800) concept in practice. The arrangement of the steam turbine and the boiler results in short steam lines and a short electrical run to the switchyard. The side arrangement of the cooling tower in relation to the electrostatic precipitators allows efficient routing of the flue-gas exhaust system through the cooling tower, while at the same time optimising the circulating water system. The modular steam turbine enables full speed tandem compound turbosets for ultrasupercritical steam power plants (gross power output: 600 to 1200 MW per unit). The HP cylinder is designed as a barreltype turbine and has an inner casing. This rotation symmetric design offers minimum deformation during steady-state and transient operation, reports Siemens. WIP Internet link www.energy.siemens.com 36 A UGUST 2011 • WORLDWIDE I NDEPENDENT P OWER

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