초록

A gas turbine uses a first fuel at full load and an improved emission behavior is achieved by operating the gas turbine (11) at partial load with a second fuel, which has a richer mix of higher-value hydrocarbons (C2+) with 2 and more carbon atoms per molecule like ethane (C2H6) and propane (C3H8).

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What is claimed is: 1. A gas turbine system useful with a first fuel at full load and a second fuel to achieve an improved emission behavior, with the second fuel having a richer mix of higher-value hydrocarbons with 2 or more carbon atoms per molecule than said first fuel, the system comprising: a

What is claimed is: 1. A gas turbine system useful with a first fuel at full load and a second fuel to achieve an improved emission behavior, with the second fuel having a richer mix of higher-value hydrocarbons with 2 or more carbon atoms per molecule than said first fuel, the system comprising: a gas turbine having a compressor, at least one combustion chamber, and at least one turbine; at least one fuel source; a main fuel feeding line fluidly communicating the at least one fuel source to at least one of said at least one combustion chamber; means for controlling change of the composition of the fuel flowing though the main fuel feeding line; a reservoir containing higher-value hydrocarbons; wherein the means for controlling comprises an auxiliary fuel feeding line configured and arranged to discharge into the main fuel feeding line, the auxiliary fuel feeding line being fluidly connected to the reservoir; wherein the higher-value hydrocarbon containing reservoir comprises a liquid gas storage tank; and an evaporator arranged in the auxiliary fuel feeding line. 2. A gas turbine system according to claim 1, further comprising: a controllable valve arranged in the auxiliary fuel feeding line configured and arranged to set a gas stream that flows though the auxiliary fuel feeding line. 3. A gas turbine system according to claim 1, wherein the higher-value hydrocarbon containing reservoir comprises a gas reservoir. 4. A gas turbine system according to claim 1, wherein the higher-value hydrocarbons comprises a fuel selected from the group consisting of ethane (C2H6) and propane (C3H8). 5. A gas turbine system useful with a first fuel at full load and a second fuel to achieve an improved emission behavior, with the second fuel having a richer mix of higher-value hydrocarbons with 2 or more carbon atoms per molecule than said first fuel, the system comprising: a gas turbine having a compressor, at least one combustion chamber, and at least one turbine; at least one fuel source; a main fuel feeding line fluidly communicating the at least one fuel source to at least one of said at least one combustion chamber; means for controlling change of the composition of the fuel flowing though the main fuel feeding line; a reservoir containing higher-value hydrocarbons; wherein the means for controlling comprises an auxiliary fuel feeding line configured and arranged to discharge into the main fuel feeding line, the auxiliary fuel feeding line being fluidly connected to the reservoir; and a gas separating mechanism arranged in the main fuel feeding line configured and arranged to separate high-value hydrocarbons from a gas when flowing though the main fuel feeding line and to supply said high-value hydrocarbons to the higher-value hydrocarbon containing reservoir. 6. A gas turbine system according to claim 5, wherein the higher-value hydrocarbon containing reservoir comprises a liquid gas storage tank, and further comprising: a gas liquefying mechanism arranged between the gas separating mechanism and the liquid gas storage tank. 7. A gas turbine system according to claim 5, further comprising: a controllable valve arranged in the auxiliary fuel feeding line configured and arranged to set a gas stream that flows though the auxiliary fuel feeding line. 8. A gas turbine system according to claim 5, wherein the higher-value hydrocarbon containing reservoir comprises a gas reservoir. 9. A gas turbine system according to claim 5, wherein the higher-value hydrocarbons comprises a fuel selected from the group consisting of ethane (C2H6) and propane (C3H8). 10. A gas turbine system useful with a first fuel at full load and a second fuel to achieve an improved emission behavior, with the second fuel having a richer mix of higher-value hydrocarbons with 2 or more carbon atoms per molecule than said first fuel, the system comprising: a gas turbine having a compressor, at least one combustion chamber, and at least one turbine; at least one fuel source; a main fuel feeding line fluidly communicating the at least one fuel source to at least one of said at least one combustion chamber; means for controlling change of the composition of the fuel flowing though the main fuel feeding line; a reservoir containing higher-value hydrocarbons; wherein the means for controlling comprises an auxiliary fuel feeding line configured and arranged to discharge into the main fuel feeding line, the auxiliary fuel feeding line being fluidly connected to the reservoir; and a load controller configured and arranged, based on the required gas turbine performance, to control the change of the composition of the fuel that flows though the main fuel feeding line. 11. A gas turbine system according to claim 10, further comprising: a controllable valve arranged in the auxiliary fuel feeding line configured and arranged to set a gas stream that flows through the auxiliary fuel feeding line. 12. A gas turbine system according to claim 10, wherein the higher-value hydrocarbon containing reservoir comprises a gas reservoir. 13. A gas turbine system according to claim 10, wherein the higher-value hydrocarbons comprises a fuel selected from the group consisting of ethane (C2H6) and propane (C3H8). 14. A gas turbine system useful with a first fuel at full load and a second fuel to achieve an improved emission behavior, with the second fuel having a richer mix of higher-value hydrocarbons with 2 or more carbon atoms per molecule than said first fuel, the system comprising: a gas turbine having a compressor, at least one combustion chamber, and at least one turbine; at least one fuel source; a main fuel feeding line fluidly communicating the at least one fuel source to at least one of said at least one combustion chamber; means for controlling change of the composition of the fuel flowing though the main fuel feeding line; a reservoir containing higher-value hydrocarbons; wherein the means for controlling comprises an auxiliary fuel feeding line configured and arranged to discharge into the main fuel feeding line, the auxiliary fuel feeding line being fluidly connected to the reservoir; and means for selectively connecting the main fuel feeding line to two fuel sources with different contents of higher-value hydrocarbons. 15. A gas turbine system according to claim 14, wherein said means for selectively connecting comprises a mixing device. set a gas stream that flows though the auxiliary fuel feeding line. 16. A gas turbine system according to claim 14, further comprising: a controllable valve arranged in the auxiliary fuel feeding line configured and arranged to set a gas stream that flows though the auxiliary fuel feeding line. 17. A gas turbine system according to claim 14, wherein the higher-value hydrocarbon containing reservoir comprises a gas reservoir. 18. A gas turbine system according to claim 14, wherein the higher-value hydrocarbons comprises a fuel selected from the group consisting of ethane (C2H6) and propane (C3H8).