Method of operating a steam turbine

Abstract

In a method of operating a steam turbine which consists of at least two separate turbine sections (11, 15), working at different pressures from one another, and works with at least one reheat, in which arrangement the steam is directed to at least one reheater (13) after flowing through the separate turbine section of higher pressure (11), is heated in said reheater (13) and is then fed to the separate turbine section of lower pressure (15), the separate turbine section of lower pressure (15) is fed with cooler steam during the starting and run-up phase than during full-load/continuous operation. This is done, for example, owing to the fact that at least some of the exhaust steam from the separate turbine section of higher pressure (11) is directed via a bypass (18) directly into the separate turbine section of lower pressure (15) during the run-up phase of the turbine, and all the exhaust steam from the separate turbine section of higher pressure (11) is directed into the reheater (13) only upon reaching full-load or in continuous operation, is heated in said reheater (13) and is then fed to the separate turbine section of lower pressure (15). Injection of water into the hot reheater steam is likewise possible. The starting time of the turbine is thereby reduced.

Dependencies are inferred from the claim text.