General Electric Technology Gmbh

Alstom Technology Limited

François Droux

Richard Carroni

Christoph Bernhard Ruchti

Donald William Bairley

Hongtao Li

Gijsbertus Oomens

Ian J Perrin

Paul Drouvot

Klara Berg

Joerg Dietzmann

Glenn T Selby

Karl Reyser

Henrik Nielsen

Falk Ruecker

Torbjoern Stenstroem

Christoph Ruchti

Wesley P Ii Bauver

The invention relates to a method for operating a combined cycle power plant, which includes a steam turbine powertrain with a high-pressure steam turbine, an intermediate pressure steam turbine and a low-pressure steam turbine, whereby intermediate pressure steam flowing from the exit of the high-pressure steam turbine to the inlet of the intermediate pressure steam turbine is reheated by means of the reheat device, and which is connected to a solar thermal plant, that generates additional solar steam for being used by said steam turbine powertrain. The output of the solar steam generator is used more effectively, and the overall plant performance, flexibility and operability are enhanced by at least part of the additional solar steam reaching the intermediate pressure steam turbine without being reheated in said reheat device.

Method for operating a combined cycle power plant and combined cycle power plant for conducting said method

The invention refers to a CCPP comprising a gas turbine, a water steam cycle with a steam turbine and a HRSG with at least two pressure levels, and a fuel preheater for preheating the fuel of the gas turbine. The fuel preheater includes a first heat exchanger for preheating the fuel to a first elevated temperature, which is connected to a feed water line from a pressure level of the HRSG, which is below the highest HRSG pressure level, and a second heat exchanger for further preheating the fuel gas to a second elevated temperature, which is connected to the high pressure feed water with the highest pressure level of the HRSG. The disclosure further refers to a method for operating a CCPP with such a fuel preheater.

Power plant with integrated fuel gas preheating

A method involved operating a combined-cycle power plant (), which has a gas turbine () with a compressor () and a turbine (), a heat recovery steam generator () which is connected downstream to the gas turbine () and is for producing steam in a water/steam cycle, and also at least one once-through cooler (), through which flows compressed air which is compressed in the compressor () and intended for cooling the gas turbine (), and, cooling down, converts feed-water () which is fed from the heat recovery steam generator () into steam, and discharges the steam to the heat recovery steam generator (). Making the operation more flexible is achieved, without lowering the load of the gas turbine (), by the combined-cycle power plant () being switched between a first operating mode, in which only the gas turbine cycle is used for power generation, and a second operating mode, in which the gas turbine cycle and the water/steam cycle are used for power generation.

Method for operating a combined-cycle power plant, and combined-cycle power plant useful for carrying out the method

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Oberrohrdorf, Switzerland

François Droux