Steam turbine installation and method for operating the steam turbine installation

摘要

A steam turbine installation that has a steam turbine, a steam generator and a feed water pre-heating unit operated by process steam is provided. The steam turbine has an overload bypass line with which main steam can be fed to the feed water pre-heating unit between the steam turbine input and the extraction point during overload operation of the steam turbine, wherein the feed water pre-heating unit has an auxiliary extraction line that is connected to the overload bypass line in such a way that process steam can be extracted from the steam turbine during partial load operation of the steam turbine and added to the feed water pre-heating unit for the additional pre-heating of feed water.

主权项

1. A steam turbine installation comprising:
a steam turbine, a steam generator and a feed water pre-heating device which is operated using process steam, the steam turbine comprising an overload bypass line which, in overload operation of the steam turbine, live steam can be fed in between a steam turbine inlet and a bleed point of the feed water pre-heating device, and the feed water pre-heating device comprising an auxiliary bleed line which is connected to the overload bypass line such that, in partial-load operation of the steam turbine, process steam can be bled from said steam turbine and can be fed to the feed water pre-heating device to provide auxiliary pre-heating of the feed water, and a control system adapted to
determine an optimum efficiency and an associated rated power of the steam turbine;open the overload bypass line and isolate the auxiliary bleed line in response to determining that the steam turbine is operated above the associated rated power such that live steam is fed in between the steam turbine inlet of the steam turbine and the bleed point of the feed water pre-heating device; andisolate the overload bypass line and open the auxiliary bleed line in response to determining that the steam turbine is operated below the associated rated power such that process steam is bled from between the steam turbine inlet of the steam turbine and the bleed point and is fed to the feed water pre-heating device to provide auxiliary pre-heating of the feed water.