Patent ID: 11339687

Abstract:
The invention relates to a power plant (1) for generating electric energy (100) and process steam (200), comprising: —a gas turbine (2) for driving a first generator (3) in order to generate electric energy (100) by combusting a fuel into flue gas (300), —a steam turbine (4) for driving a second generator (5) in order to generate electric energy (100), comprising a first stage (4a) for converting fresh steam (400) into residual steam (201), which constitutes at least part of the process steam (200), and —a waste heat steam generator (6) for generating the fresh steam (400) from fresh water (500) using the exhaust heat of the flue gas (300), wherein —the residual steam (201) has a residual steam pressure which is lower than the pressure of the fresh steam (400), —the waste heat steam generator (6) comprises a pre-heater (7) for pre-heating the fresh water (500) in order to form feed water (600) and an evaporator (8) for evaporating the feed water (600) in order to form the fresh steam (400), and —the feed water (600) has a feed water pressure which is higher than the residual steam pressure. The invention is characterized by a throttle valve (9, 14) for expanding part of the feed water (600) either at the residual steam pressure in order to generate an additional steam (202) or at a drive steam pressure which is lower than the residual steam pressure in order to generate a drive steam (700) for operating a second stage (4b) of the steam turbine (4).