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US 2023/0145545 A1Published application
Method and apparatus for improving energy efficiency in existing gas turbine combined cycle plants
OwnerAri Löyttyinventor
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OwnerAri Löyttyinventor
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Method and apparatus for improving the energy efficiency of existing gas turbine combined cycle plants in which a compressor pressurises air which is combusted with fuel in a combustion chamber, followed by a turbine and a high temperature heat exchanger and a low temperature heat exchanger. In the secondary circulation after the steam turbine II, steam is condensed in the condenser into water, which is pressurised to the maximum pressure by means of a pump and preheated in low temperature heat exchanger and vaporised in a high temperature heat exchanger. After the high temperature heat exchanger, steam enters the steam turbine wherefrom a tap is taken, if necessary, which is injected after preheating into the combustion chamber of the gas turbine process or at the latest the beginning of the vanes of the turbine. Before steam turbine II, the enthalpy of steam (and additional water) at below 1 atm is increased by means of the condensation heat of the water contained in the combustion gases, after which intermediate superheating is applied to the saturated Rankine circulation steam using the excess heat of the low temperature heat exchanger.
A method for improving the energy efficiency of existing gas turbine combined cycle plants, wherein the compressor pressurises the combustion air which is combusted with fuel in a combustion chamber, followed by a turbine and a high temperature heat exchanger, wherein feed water pressurised by a pump is vaporized, the pump being arranged after a secondary process steam turbine II followed by a condenser-heat exchanger, wherein condensing heat of the steam contained by the combustion gases in atmospheric pressure and formed in combustion is used for increasing the enthalpy of the process circulation steam at a pressure of less than 1 bar by 100 to 350 kJ/kg in constant temperature subsequent to a steam turbine at a low temperature heat exchanger, subsequent to which the excess heat of the low temperature heat exchanger is used, subsequent to the high temperature heat exchanger, for intermediate superheating of steam between the steam turbine and the steam turbine II.
A method for improving the energy efficiency of existing gas turbine combined cycle plants, wherein the compressor pressurises the combustion air which is combusted with fuel in a combustion chamber, followed by a turbine and a high temperature heat exchanger, wherein feed water pressurised by a pump is vaporized, the pump being arranged after a secondary process steam turbine II followed by a condenser-heat exchanger, wherein condensing heat of the steam contained by the combustion gases in 1 atm pressure and formed in combustion is used for increasing the enthalpy of the circulation steam of Rankine process at a pressure of less than 1 bar by 100 to 350 kJ/kg in constant temperature subsequent to a steam turbine at a low temperature heat exchanger and/or for vaporising the liquid additional water fed to the Rankine process circulation in a pressure below 1 bar that is combined with the main Rankine circulation only at a pressure below 1 bar, subsequent to which steam is superheated in the low temperature heat exchanger by using, subsequent to the high temperature heat exchanger, the heat of the combustion gases between the steam turbine and the steam turbine.
An apparatus for improving the energy efficiency of existing gas turbine combined cycle plants, wherein the compressor pressurises the combustion air which is combusted with fuel in a combustion chamber, followed by a turbine and a high temperature heat exchanger, wherein feed water pressurised by a pump is vaporized, the pump being arranged after a secondary process steam turbine II followed by a condenser-heat exchanger, wherein condensing heat of the steam contained by the combustion gases in atmospheric pressure and formed in combustion is used for increasing the enthalpy of the process circulation steam at a pressure of less than 1 bar by 100 to 350 kJ/kg in constant temperature subsequent to a steam turbine at a low temperature heat exchanger, subsequent to which the excess heat of the low temperature heat exchanger is used, subsequent to the high temperature heat exchanger, for intermediate superheating of steam between the steam turbine and the steam turbine II.
An apparatus for improving the energy efficiency of existing gas turbine combined cycle plants, wherein the compressor pressurises the combustion air which is combusted with fuel in a combustion chamber, followed by a turbine and a high temperature heat exchanger, wherein feed water pressurised by a pump is vaporized, the pump being arranged after a secondary process steam turbine II followed by a condenser-heat exchanger, wherein condensing heat of the steam contained by the combustion gases in 1 atm pressure and formed in combustion is used for increasing the enthalpy of the circulation steam of Rankine process at a pressure of less than 1 bar by 100 to 350 kJ/kg in constant temperature subsequent to a steam turbine at a low temperature heat exchanger and/or for vaporising the liquid additional water fed to the Rankine process circulation in a pressure below 1 bar that is combined with the main Rankine circulation only at a pressure below 1 bar, subsequent to which steam is superheated in the low temperature heat exchanger by using, subsequent to the high temperature heat exchanger, the heat of the combustion gases between the steam turbine and the steam turbine II.
Dependencies are inferred from the claim text.