SOLAR-THERMAL POWER PLANT HAVING STORAGE MEANS FOR A HEAT TRANSFER MEDIUM, AND METHOD FOR OPERATING THE SOLAR-THERMAL POWER PLANT IN THE DISCHARGE MODE OF THE STORAGE MEANS

摘要

The invention relates to a solar-thermal power plant having at least one heat transfer medium storage means for storing a heat transfer medium into which solar energy can be input, and having at least one steam circuit for generating steam by means of input solar energy. In this case, the steam circuit has at least one feed water preheating apparatus for preheating feed water to the steam circuit and has at least one steam circuit bypass line for bypassing the feed water preheating apparatus. The steam circuit bypass line can be activated as a function of an operating mode of the heat transfer medium storage means, so that feed water can flow through the steam circuit bypass line. The operating mode of the heat transfer medium storage means is, in particular, a discharge mode (discharge operation) for removing heat transfer medium from the heat transfer medium storage means. The invention also specifies a method for operating a solar-thermal power plant comprising the following method step: activating the steam bypass line as a function of the operating mode of the heat transfer medium storage means, so that feed water flows through the steam circuit bypass line. The feed water temperature is reduced in the discharge mode with the aid of the steam circuit bypass. The temperature difference between the heat source and the heat sink and, consequently, the storage capacity of the heat transfer medium storage means are increased as a result.