Patent ID: 8857183

Claim:
A method for operating a steam turbine, the steam turbine comprising a single flow high-and-intermediate pressure turbine, the high-and-intermediate pressure turbine having a high-pressure part and an intermediate-pressure part on a downstream side of the high-pressure part; a single flow intermediate-pressure turbine; and a low-pressure turbine, the high-and-intermediate pressure turbine, the intermediate-pressure turbine, and the low-pressure turbine being disposed between a steam inlet and a steam outlet, the method comprising: expanding a steam supplied through the steam inlet of the high-and-intermediate pressure turbine in the high-pressure part; branching a flow of the steam having passed through the high-pressure part into a flow of a first steam and a flow of a second steam; expanding the first steam in the intermediate-pressure part of the high-and-intermediate pressure turbine; leading the second steam into the intermediate-pressure turbine so as to expand the second steam in the intermediate-pressure turbine; and leading the first steam having passed through the intermediate-pressure part and the second steam having passed through the intermediate-pressure turbine into the low-pressure turbine.