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5 EP 2 573 317 A1 6 bodied not as a through-hole but as a blind hole. At the end of the blind hole further radial holes 3 are provided through which the steam can escape to the outside again after flowing through the rotor 1. Preferably in this case a number of radial holes 3 are provided which are dis- tributed evenly over the circumference so that an even outflow of steam is ensured. The blind hole in this case is only made far enough into the rotor 1 as is necessary to achieve even heating-up and even cooling-down of the rotor. It is normally not necessary to drill a hole right through the rotor 1 in the axial direction since the tem- perature decreases with each rotor stage group and thus at the end on the turbine output side only a low rotor temperature is present and thus a small risk of rotor dis- tortions no longer exists. In exemplary embodiment 2 the steam volume flow is regulated by means of a closure element 5 which is ar- ranged movably in the axial hole 2. Depending on the position of the closure element 5 a more or less large opening cross-section for the radial hole 3 is opened up or closed off for the flow, thereby enabling the steam volume flow to be regulated. The closure element 5 is preferably connected in its turn to a control device. [0022] The rotor 1 preferably again has sealing steam flowing through it so that no additional steam supply is necessary. [0023] The inventive method for operating a steam tur- bine is explained briefly below. The method is designed so that, upon defined operating states being reached, steam, preferably sealing steam, flows through at least areas of the rotor 1. The defined operating states in this case are at least the shutdown and/or the idle state and/or the starting-up of the steam turbine. During one of these defined operating states the rotor 1 has steam flowing through at least some areas of it. By this means the rotor 1 is brought quickly up to operating temperature and heats up very evenly during this process. The even heat- ing of the rotor 1 effectively avoids a deflection of the rotor 1 and thus rubbing damage on the tur⎯ bine hous- ing 8 being able to occur. The rapid heating-up of the rotor 1 means that the other internal components of the steam turbine are heated up more quickly at the same time. The faster heating-up of the rotor and additional internal components of the steam turbine makes it pos- sible to start the steam turbine more quickly. Especially when such a steam turbine is used for solar-thermal pow- er plants, this achieves optimum utilization of the hours of sunshine, as a result of which a more cost-effective operation of such a solar-thermal power plant can be achieved. [0024] Basically the inventive rotor and the inventive steam turbine are suitable for all steam turbines, with particular advantages being produced for steam turbines where there is frequent starting-up and shutting-down of the steam turbine, as is typically the case in solar-thermal power plants. Claims 1. A rotor (1) for a steam turbine, especially for solar- thermal power plants, characterized in that the rotor (1) is embodied so that steam is able to flow through it at least in some areas. 2. The rotor (1) for a steam turbine as claimed in claim 1, characterized in that the rotor (1) has an axial hole (2) through which steam can flow. 3. The rotor (1) for a steam turbine as claimed in claim 2, characterized in that the axial hole (2) is embodied as a through-hole or as a blind hole. 4. The rotor (1) for a steam turbine as claimed in claim 2or3, characterized in that at least one radial hole (3) opens out into the axial hole (2) . 5. The rotor (1) for a steam turbine as claimed in claim 4, characterized in that the axial hole (2) is able to have steam supplied to it and/or removed from it through the at least one radial hole (3). 6. The rotor (1) for a steam turbine as claimed in one of the preceding claims, characterized in that the steam volume inflow and/or outflow is able to be regulated. 7. The rotor (1) for a steam turbine as claimed in claim 6, characterized in that the steam volume flow is able to be regulated by means of a valve (4) or a closure element (5). 8. The rotor (1) for a steam turbine as claimed in one of the preceding claims, characterized in that the steam which flows through at least some areas of the rotor (1) is sealing steam. 9. A steam turbine comprising a rotor (1), characterized in that the rotor (1) is a rotor (1) as claimed in one of claims 1to9. 10. A method for operating a steam turbine, characterized in that at least in defined operating states steam flows through at least some areas of the rotor (1). 11. Themethodforoperatingasteamturbineasclaimed 5 10 15 20 25 30 35 40 45 50 55 4PDF Image | Rotor for a steam turbine
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