ADDITIONAL CONTROLLED EXTRACTION FOR A PREHEATER FOR IMPROVING THE PLANT DYNAMICS AND THE FREQUENCY REGULATION IN A STEAM POWER PLANT

摘要

The invention relates to an extraction method for a preheater of a steam power plant and to a water steam circuit in a steam power plant. According to the invention a higher energetic steam is tapped on a turbine of the steam power plant and is admixed to a lower energetic steam which is tapped on the turbine. The steam mixture of the lower energetic steam and the admixed higher energetic steam is fed to a preheater in particular a high pressure preheater especially a last high pressure preheating stage of the high pressure preheater of the steam power plant particularly for heating feed water flowing through the preheater. By an in particular regulated and/or controlled admixing of the higher energetic steam to the lower energetic steam (controlled extraction) a fast power change can be achieved in the steam power plant particularly in part load operation of the steam power plant by changing the temperature of the lower energetic steam.