Method for operating a gas and steam turbine installation for frequency support

a technology of gas and steam turbines, applied in steam engine plants, machines/engines, mechanical equipment, etc., can solve problems such as power loss and efficiency during standby operation of installations, and achieve the effect of improving the power reserve availabl

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a technology of gas and steam turbines, applied in steam engine plants, machines/engines, mechanical equipment, etc., can solve problems such as power loss and efficiency during standby operation of installations, and achieve the effect of improving the power reserve availabl

US20140345278A1Inactive Publication Date: 2014-11-27SIEMENS AG

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[0021]FIG. 1 shows a gas and steam turbine installation 1 which comprises a gas turbine 2 and a steam turbine 3. A rotor of the gas turbine, a rotor of a generator 5 and a rotor of the steam turbine 3 are coupled to one another by means of a shaft 4, wherein the rotor of the steam turbine 3 and the rotor of the generator 5 can be rotationally separated from one another and coupled to one another by means of a coupling 6. The rotors of the generator 5 and of the gas turbine 2 are fixedly interconnected. A flue gas outlet from the gas turbine 2 is connected, by means of an exhaust gas line 7, to a waste heat steam generator 8 which is provided for generating the working steam of the steam turbine 3 using waste heat from the gas turbine.

[0022]When the gas and steam turbine installation 1 is in operation, the rotating rotor of the gas turbine 2 drives, via the shaft 4, a compressor 9 by means of which combustion air is drawn in from the surroundings and fed to a combustor 10. There, the...

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Abstract

A method for operating a gas and steam turbine system having a gas turbine, a steam turbine and a waste heat steam generator is provided herein, wherein steam for the steam turbine can be generated in the exchange of heat with exhaust gas from the gas turbine. Absorption capacity of the steam turbine can be increased and pressure in the waste heat steam generator can be lowered to utilize storage reserves in the waste heat steam generator for increased generation of steam to assist the frequency in the power system starting from a steady-state operating mode. Thermal energy is fed to the waste heat steam generator wherein a power profile of the gas and steam turbine system is greater than or equal to a preceding power level of the steady-state operating mode to increase the absorption capacity of the steam turbine and reduce pressure in the waste heat steam generator.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2012 / 071478 filed Oct. 30, 2012, and claims the benefit thereof. The International Application claims the benefit of European Application No. EP11188956 filed Nov. 14, 2011. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The invention relates to the frequency support operation of a gas and steam turbine installation.BACKGROUND OF INVENTION[0003]The energy market increasingly requires highly flexible power station installations which, in addition to short startup and shutdown times, can also cover a large power range and are well prepared for frequency support operation.[0004]This also includes, inter alia, the ability to free up additional power in the event of high electricity demand (what is termed peak load operation). In this context it will be expected in the future that power stations which are ope...

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Application Information

Patent Timeline

27 Nov 2014

Publication

US20140345278A1

IPC: F01K27/02

CPC: F01K27/02; F01K3/04; F01K23/101

Inventors: PICKARD, ANDREAS; SCHMID, ERICH