US 2018/0371956 A1Published application

Stack energy control in combined cycle power plant

AssigneeSiemens Energy, Inc.

InventorsUygar O. Selman, Matthew Kalish, Stephanie Boisvert, Ankur Deshmukh, Marc Fimpel, Balaji Ramamurthy, Miguel Cancelado, Peter Witte, Peter Simon Rop

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Abstract

A combined cycle power plant and method for operating a combined power plant with stack energy control are presented. The combined cycle power plant includes a gas turbine, a heat recovery steam generator including a plurality of heating surfaces, and a steam turbine. The heating surfaces may be partially bypassed to reduce steam production in the heat recovery steam generator during power plant startup. Less energy may be extracted from exhaust gas of the gas turbine. More energy may be dumped through an exhaust stack. The steam turbine may start without restriction of a gas turbine load during power plant startup. The steam turbine may start without increasing a size of an air cooled condenser while maintaining a higher load of a gas turbine during power plant startup.

Claims20

Dependent claims

A combined cycle power plant comprising:

a gas turbine that is configured to generate power output and produce exhaust gas;
a heat recovery steam generator comprising a plurality of heating surfaces located downstream of the gas turbine that is configured to receive the exhaust gas from the gas turbine and produce steam by extracting energy from the exhaust gas;
an exhaust stack that is configured to dump the exhaust gas after passing through the plurality of the heating surfaces;
and
a steam turbine that is configured to receive the steam produced in the heat recovery steam generator to generate power output,
wherein the plurality of the heating surfaces are configured to be partially bypassed during startup of the power plant to reduce a production of the steam such that less energy is extracted from the exhaust gas,
wherein the exhaust stack is configured to dump the exhaust gas having more energy due to the reducing of the production of the steam and the less energy extracted from the exhaust gas during the startup of the power plant, and
wherein the steam turbine is configured to be able to start while operating the gas turbine at a load up to a base load.

5 more elements

A method for operating a combined cycle power plant, wherein the combined cycle power plant comprise a gas turbine, a heat recovery steam generator comprising a plurality of heating surfaces located downstream of the gas turbine, and a steam turbine, the method comprising:

operating the gas turbine to generate power output and produce exhaust gas;
partially bypassing the plurality of the heating surfaces for reducing production of steam generated in the heat recovery steam generator such that less energy is extracted from the exhaust gas of the gas turbines during startup of the power plant;
dumping the exhaust gas having more energy through an exhaust stack due to the reducing of the production of the steam and the less energy extracted from the exhaust gas during the startup of the power plant, and
starting the steam turbine while operating the gas turbine at a load up to a base load.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/064,154Filed 22 Dec 2015
Published: 27 Dec 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

F01K 23/108
With water evaporated or preheated at different pressures in exhaust boiler: regulating means specially adapted therefor
F01D 19/00
Starting of machines or engines
F01K 23/106
With exhaust fluid of one cycle heating the fluid in another cycle: with water evaporated or preheated at different pressures in exhaust boiler
F01L 19/00
Slide valve-gear or valve arrangements with reciprocatory and other movement of same