Method for operating combined-cycle power plant with cogeneration and combined-cycle power plant for carrying out the method
A technology of combined cycle and power equipment, which is applied in the direction of mechanical equipment, combined combustion mitigation, energy industry, etc., and can solve the problems of reduced power production of combined cycle power equipment
Active Publication Date: 2013-06-12
GENERAL ELECTRIC TECH GMBH
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On the other hand, the higher steam extraction pressure resulted in a slight decrease in the electricity production of the combined cycle power plant
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[0034] Figure 1 shows a simplified plant layout of a combined cycle power plant 10 with an associated desalination plant 15 according to an exemplary embodiment of the present invention. The illustrated combined cycle power plant 10 includes a gas turbine 11 , a water steam circuit 12 and a desalination plant 15 . The gas turbine 11 driving the first generator G1 comprises a compressor 18 , a combustor 19 and a turbine 20 . The compressor 18 introduces combustion air via the air inlet 16, compresses it and then sends it to the combustion chamber 19, where it, together with the introduced fuel, feeds the combustion process which produces hot exhaust gases which are downstream turbine 20 to generate work. The amount of combustion air introduced can be controlled via variable inlet guide vanes 17 .
[0035] Hot exhaust gases from the gas turbine 11 flow through a heat recovery steam generator 13 arranged in the water steam circuit 12 to convert feedwater from the feedwater tank 2...
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The invention relates to a method for operating a combined-cycle power plant (10) with cogeneration, in which combustion air is inducted in at least one gas turbine (11), is compressed and is fed to at least one combustion chamber (19) for combustion of a fuel, and the resultant exhaust gas is expanded in at least one turbine (20) producing work, and in which the exhaust gas which emerges from the at least one turbine (20) is fed through a heat recovery steam generator (13) in order to generate steam, which heat recovery steam generator (13) is part of a water-steam circuit (12) with at least one steam turbine (14), a condenser (32), a feedwater tank (28) and a feedwater pump (P2), wherein heat is produced by extraction of steam from the at least one steam turbine (14). 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 (14) 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 invention relates to the field of power plant technology and in particular to a method for operating a combined cycle power plant with cogeneration according to the terms of claim 1 . The invention also relates to a combined cycle power plant for carrying out the method. Background technique [0002] In some areas of power plant operation, simultaneous generation of electricity and heat is required. The two types of energy generated do not necessarily experience the same demand profile from the connected consumers. Electricity production has traditionally been governed by the needs of the grid system or, in some cases, by large local industrial consumers. The demand for heat is often dictated by industrial process demands or by daily or seasonal fluctuations in remote heating networks or drinking water treatment plants. With regard to the last-mentioned drinking water treatment, countries with large desalination plants have major fluctuations in...
Claims
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IPC IPC(8): F01K17/04F01K23/10
CPCF01K17/04F01K23/103Y02E20/14Y02E20/16Y02P80/15F01K23/02
Inventor F.德鲁克斯D.U.布雷奇K.雷泽尔S.罗夫卡J.维克
Owner GENERAL ELECTRIC TECH GMBH