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1. WO2013143975 - GAS TURBINE POWER PLANT WITH NON-HOMOGENEOUS INPUT GAS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

PATENT CLAIMS

1 . A method for operating a gas turbine (6) comprising a compressor (1 ) with annular inlet area, at least two burners, a combustion chamber (4, 14, 15) and a turbine (7, 16, 17), characterized in that at least one first partial intake flow, consisting of oxygen-reduced gas (21 ) which has an oxygen

concentration which is lower than the average oxygen concentration of the compressor intake flow, and at least one second partial intake flow, consisting of fresh air (2), are fed to the compressor (1 ) in an alternating manner in the circumferential direction of the inlet area.

2. The method as claimed in claim 1 , characterized in that the alternating feed of oxygen-reduced gas (21 ) and fresh air (2) is carried out via an inner sector (3") of the inlet cross section relative to a rotational axis of the compressor (1 ) and fresh air (2) is fed via an outer sector (3') of the inlet cross section relative to the rotational axis of the compressor (1 ).

3. The method as claimed in claim 1 , characterized in that the alternating feed of oxygen-reduced gas (21 ) and fresh air (2) is carried out via an inner sector (3") of the inlet cross section relative to a rotational axis of the compressor (1 ) and oxygen-reduced gas (21 ) is fed via an outer sector (3') of the inlet cross section relative to the rotational axis of the compressor (1 ).

4. The method as claimed in one of claims 1 to 3, characterized in that a first partial intake flow, consisting of oxygen-reduced gas (21 ), is directed in each case into one burner, or into an integral multiple of adjacent burners, downstream of the compressor (1 ).

The method as claimed in one of claims 1 to 4, characterized in that a second partial intake flow, consisting of fresh air (2), is directed in each case into one burner, or into an integral multiple of adjacent burners, downstream of the compressor (1 ).

The method as claimed in one of claims 1 to 5, characterized in that the fuel feed to a burner which is supplied with oxygen-reduced gas (21 ) compared with the fuel feed to a burner which is supplied with fresh air (2) is reduced so that the hot combustion gases at the outlet of the burners have the same oxygen concentration.

The method as claimed in one of claims 1 to 6, characterized in that the compressor inlet (3), to which is connected the flow passage of the compressor (1 ), is split into at least one first segment (51 ) and at least one second segment (52), the outlets of which are arranged in an alternating manner around the compressor inlet in the circumferential direction, wherein fresh air (2) is fed in each case via the at least one first segment (51 ) and oxygen-reduced gas (21 ) is fed via the at least one second segment (52) in an alternating manner.

The method as claimed in one of claims 1 to 7, characterized in that the flue gases of the gas turbine (6) are split into a first flue gas flow (21 ) for recirculation into the intake flow (3) of the gas turbine (6) and into a second flue gas partial flow (20) for discharging to the environment, and in that the oxygen-reduced gas (21 ) comprises the recirculated first flue gas flow (21 ) of the gas turbine.

9. A gas turbine power plant comprising a gas turbine (6) with a compressor inlet (3), a compressor (1 ) with annular inlet area, at least two burners, a combustion chamber (4) and a turbine (7),

characterized in that

the compressor inlet (3), to which is connected the flow passage of the compressor (1 ), comprises at least one first segment (51 ) and at least one second segment (52) which are arranged in an alternating manner around the compressor inlet in the circumferential direction, wherein a feed for an oxygen-reduced gas (21 ), which has an oxygen concentration which is lower than the average oxygen concentration of the compressor intake flow during operation of the gas turbine (6), is connected to the at least one first segment (51 ) of the compressor inlet (3), and a fresh air feed is connected to the at least one second segment (52) of the compressor inlet (3).

10. The gas turbine power plant as claimed in claim 9, characterized in that the compressor inlet (3), to which is connected the flow passage of the compressor (1 ), comprises an inner sector (3") relative to the rotational axis of the compressor (1 ) and an outer sector (3') relative to the rotational axis of the compressor (1 ), wherein the alternating first segments (51 ) and second segments (52) are arranged in the inner sector (3") of the inlet cross section relative to a rotational axis of the compressor (1 ).

1 1 . The gas turbine power plant as claimed in claim 9, characterized in that the compressor inlet (3), to which is connected the flow passage of the compressor (1 ), comprises an inner sector (3") relative the rotational axis of the compressor (1 ) and an outer sector (3') relative to the rotational axis of the compressor (1 ), wherein the alternating first segments (51 ) and second segments (52) are arranged in the outer sector (3') of the inlet cross section relative to a rotational axis of the compressor (1 ).

12. The gas turbine power plant as claimed in one of claims 9 to 1 1 ,

characterized in that an integral multiple of burners are arranged per first segment (51 ) of the compressor, and an integral multiple of burners are arranged per second segment (52).

13. The gas turbine power plant as claimed in one of claims 10 to 12, characterized in that it comprises a control element by means of which the area ratio of the sum of the connecting areas of the at least one first segment (51 ) to the flow passage of the compressor (1 ) to the sum of the connecting areas of the at least one second segment (52) to the flow passage of the compressor (1 ) can be varied in order to adapt the area ratios to changes of the ratio between supplied fresh air (2) and oxygen- reduced gas (21 ).

14. The gas turbine power plant as claimed in claim 9, characterized in that a multiplicity of feed passages (39) from feed holes (49) in the bearing supports (48) of the compressor (1 ) for introduction of the oxygen-reduced gas (21 ) are arranged in the compressor inlet (3) concentrically to the axis of the gas turbine (6) in a circumferentially distributed manner.

15. The gas turbine power plant as claimed in one of claims 10 to 14,

characterized in that the gas turbine power plant comprises an exhaust gas splitter (29) for splitting the flue gas flow of the gas turbine (6) into a first flue gas partial flow (21 ), for recirculation into the intake flow of the gas turbine (6), and into a second flue gas partial flow (20) for discharging to the environment, and also comprises a recirculation line which connects the exhaust gas splitter (28) to at least one first segment (51 ) of the compressor inlet (3).