Publication Date: 2003-Aug-22
The IP.com Prior Art Database
The first blade rows in high and medium pressure steam turbines are cooled by means of water or steam flowing through hollow spaces within the blades. The cooling of blades allows low cost materials to be used for the blading when the temperature of the steam at entry into the turbine is elevated. It can also increase the overall efficiency of a power plant if the cooling medium is extracted from the water-steam-circuit of the plant, led through the blades for heat exchange, and then having a higher temperature is returned to the water-steam circuit.