Method for operating a combined-cycle power plant with cogeneration, and a combined-cycle power plant for carrying out the method
Inactive Publication Date: 2013-09-05
ALSTOM TECH LTD
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Benefits of technology
[0012]One object of the invention is to provide a method for operating a combined-cycle power plant with cogeneration and heat output by steam extraction from the steam turbine, which avoids the disadvantages of known meth
Problems solved by technology
When the steam is generated in a heat recovery steam generator (HRSG) in a combined-cycle power plant, its generation is linked directly to the load control of the gas turbine, and therefore cannot be completely decoupled from the electricity generation.
Although partial load operation of the gas turbine is possible within certain limits, it is, however, r
Method used
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[0034]FIG. 1 shows a simplified plant layout of a combined-cycle power plant 10 with a connected desalination plant 15 according to one exemplary embodiment of the invention. The illustrated combined-cycle power plant 10 comprises a gas turbine 11, a water-steam circuit 12 and a desalination plant 15. The gas turbine 11, which drives a first generator G1, comprises a compressor 18, a combustion chamber 19 and a turbine 20. The compressor 18 inducts combustion air via an air inlet 16, compresses it and then emits it to the combustion chamber 19, where, together with a fuel which is introduced, it feeds a combustion process which produces hot exhaust gases, which are expanded in the downstream turbine 20, producing work. The amount of the inducted combustion air can be controlled via variable inlet guide vanes 17.
[0035]The hot exhaust gas from the gas turbine 11 flows through a heat recovery steam generator 13, which is arranged in the water-steam circuit 12, in order there to convert...
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The invention relates to a method for operating a combined-cycle power plant with cogeneration, in which method combustion air is inducted in at least one gas turbine, is compressed and is fed to at least one combustion chamber for combustion of a fuel, and the resultant exhaust gas is expanded in at least one turbine producing work, and in which method the exhaust gas which emerges from the at least one turbine is fed through a heat recovery steam generator in order to generate steam, which heat recovery steam generator is part of a water-steam circuit with at least one steam turbine, a condenser, a feedwater tank and a feedwater pump, wherein heat is produced by extraction of steam from the at least one steam turbine. In a method such as this, simple decoupling of heat and electricity production, which is advantageous for operation, is achieved in that the steam can be selectively extracted from the at least one steam turbine as low-pressure steam or intermediate-pressure steam, and in that the steam extraction is switched from low-pressure steam to intermediate-pressure steam in order to restrict the electricity production.
Description
TECHNICAL FIELD[0001]The present invention relates to the field of power plant technology, and relates in particular to a method for operating a combined-cycle power plant with cogeneration according to the precharacterizing clause of claim 1. It also relates to a combined-cycle power plant for carrying out the method.PRIOR ART[0002]Simultaneous generation of electricity and heat is required in certain fields of operation of power plants. The two types of energy, which are generated, are not necessarily subject to the same demand profile from the connected consumers. The electricity production is traditionally governed by the requirements of the electrical grid system or, in some cases, by large local industrial consumers. The demand for heat is typically governed by the requirement of an industrial process or by the daily or seasonal fluctuations in a remote heat network or a drinking-water processing plant. With regard to the last-mentioned drinking water processing, countries wit...
Claims
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Login to View More IPC IPC(8): F01K23/02
CPCF01K17/04F01K23/103F01K23/02Y02E20/16Y02E20/14Y02P80/15
Inventor DROUX, FRANCOISBRESCHI, DARIO UGOREYSER, KARLROFKA, STEFANWICK, JOHANNES
Owner ALSTOM TECH LTD