While Lünen is one of the most efficient coal-fired power plants in Europe, what makes it particularly notable is the ability of Unit 3 to ramp quickly, making it ideally suited to balance intermittent wind and solar loads.7 To remove the ramping constraint posed by heat transfer into thick-walled HP turbine components, an internal bypass cooling system allows a small amount of cooling steam to pass through radial bores between the HP casings. This system protects the casing surfaces so the wall thickness could be less than without the cooling steam. This design also effectively allows more rapid heat-up (and thus startup) of the turbine.


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