A method for operating a gas turbine (2), in particular in a power plant, includes operating the gas turbine (2) with natural gas. In order to adapt the gas turbine operation to different natural gas qualities, a concentration of C2+ is measured in the natural gas during gas turbine (2) operation.
A method for operating a gas turbine (2), in particular in a power plant, includes operating the gas turbine (2) with natural gas. In order to adapt the gas turbine operation to different natural gas qualities, a concentration of C2+ is measured in the natural gas during gas turbine (2) operation. The gas turbine (2) then is operated based on the current concentration of C2+.
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The invention claimed is: 1. A method for operating a gas turbine which is supplied with natural gas, the method comprising: measuring, during the operation of the gas turbine, the C2+ concentration in natural gas that is supplied to the gas turbine; and operating the gas turbine based on the measu
The invention claimed is: 1. A method for operating a gas turbine which is supplied with natural gas, the method comprising: measuring, during the operation of the gas turbine, the C2+ concentration in natural gas that is supplied to the gas turbine; and operating the gas turbine based on the measured current concentration of C2+, said operating comprising, with increasing C2+ concentration, reducing a flame temperature, or reducing a turbine inlet temperature, or increasing a preheating temperature, or combinations thereof. 2. A method according to claim 1, comprising: measuring the C3+ concentration in the natural gas during the operation of the gas turbine; and wherein operating comprises operating the gas turbine based on the measured current C2+ and C3+ concentrations. 3. A method according to claim 1, wherein a control procedure for operating the gas turbine is adapted to the current C2+ concentration. 4. A method according to claim 1, comprising: adapting at least one operating parameter of the gas turbine to the current C2+ concentration. 5. A method according to at least claim 4, wherein adapting comprising adapting according to a characteristic diagram in which a characteristic line is indicated for at least one operating parameter that changes based on the C2+ concentration and that shows the respective operating parameter as a function of C2+ concentration. 6. A method according to claim 5, wherein the characteristic diagram for at least one operating parameter that is changed based on the C2+ concentration contains at least two characteristic lines that are allocated to different C3+ concentrations. 7. A method according to claim 1, wherein said reduction of the flame temperature, said reduction of the turbine inlet temperature, or both, is carried out so that: a reference temperature that is measured at a location subject to flashback remains constant; or a pollutant emissions value remains constant; or a position of the flame front remains constant in a combustion chamber of the gas turbine; or combinations thereof. 8. A method according to claim 7, comprising: measuring the reference temperature at a burner or a natural gas injection lance. 9. A method according to claim 7, wherein the pollutant emissions value comprises a NOx emissions value. 10. A method according to claim 1, wherein operating the gas turbine based on the current C2+ concentration comprises operating above a preset control concentration. 11. A method according to claim 10, wherein the control concentration is approximately 9 to 12 vol. % C2+ in natural gas. 12. A method according to claim 1, comprising: generating a warning signal when the current C2+ concentration exceeds a preset alert concentration. 13. A method according to claim 12, wherein the alert concentration is less than the control concentration. 14. A method according to claim 12, wherein the alert concentration is approximately 7 to 10 vol. % C2+ in natural gas. 15. A method according to claim 1, comprising: generating an emergency signal when the current C2+ concentration exceeds a preset maximum concentration. 16. A method according to claim 15, wherein the maximum concentration is approximately at least 16 vol. % C2+ in natural gas. 17. A method according to claim 1: wherein operating the gas turbine based on the current C2+ concentration comprises operating above a preset control concentration which is approximately 9 to 12 vol. % C2+ in natural gas; or comprising generating a warning signal when the current C2+ concentration exceeds a preset alert concentration which is approximately 7 to 10 vol. % C2+ in natural gas; or comprising generating an emergency signal when the current C2+ concentration exceeds a preset maximum concentration which is approximately at least 16 vol. % C2+ in natural gas; or combinations thereof. 18. A method according to claim 1, wherein measuring the C2+ concentration comprises measuring with a gas-phase chromatograph, a flame ionization detector, an infrared spectrometer, or combinations thereof. 19. A method according to claim 1, wherein the gas turbine is part of a power plant. 20. A gas turbine comprising: a control device configured and arranged to operate a gas turbine; a measuring device configured and arranged to measure C2+ concentrations in natural gas supplied to the gas turbine; wherein the control device operates the gas turbine based on the measured current C2+ concentration such that, with increasing C2+ concentration, the control device operates the gas turbine to reduce a flame temperature, or reduce a turbine inlet temperature, or increase a preheating temperature, or combinations thereof. 21. A gas turbine according to claim 20, wherein the measuring device is configured and arranged to measure C3+ concentrations. 22. A power plant comprising a gas turbine according to claim 20.
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