Multi-Spool Intercooled Recuperated Gas Turbine
First Claim
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1. A gas turbine engine, comprising:
- a high pressure spool having a high pressure compressor, a high pressure turbine, and a first rotatable shaft rotatably coupling the high pressure compressor and the high pressure turbine on a first pair of bearings;
a low pressure spool having a low pressure compressor, a low pressure turbine, and a second rotatable shaft rotatably coupling the low pressure compressor and the low pressure turbine;
a combustor for receiving a high pressure airflow from the high pressure compressor and delivering a heated airflow to the high pressure turbine to rotatably drive the first shaft and the high pressure compressor;
a free turbine spool comprising a free turbine and a free turbine shaft, said free turbine shaft rotatably coupling said free turbine to a load device selected from a mechanical load and an electrical load;
said high pressure turbine delivering a first reduced pressure airflow to said low pressure turbine to drive said second shaft and said low pressure compressor;
said low pressure turbine delivering a second reduced pressure airflow to said free turbine to drive said load device; and
a starter device for causing the rotation of said high pressure spool, said starter device integrally built into one or both of said first shaft and said high pressure compressor.
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Abstract
A method and apparatus are disclosed for a gas turbine power plant with a variable area turbine nozzle and an integrated motor/alternator device for starting the gas turbine and power extraction after starting.
129 Citations
22 Claims
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1. A gas turbine engine, comprising:
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a high pressure spool having a high pressure compressor, a high pressure turbine, and a first rotatable shaft rotatably coupling the high pressure compressor and the high pressure turbine on a first pair of bearings; a low pressure spool having a low pressure compressor, a low pressure turbine, and a second rotatable shaft rotatably coupling the low pressure compressor and the low pressure turbine; a combustor for receiving a high pressure airflow from the high pressure compressor and delivering a heated airflow to the high pressure turbine to rotatably drive the first shaft and the high pressure compressor; a free turbine spool comprising a free turbine and a free turbine shaft, said free turbine shaft rotatably coupling said free turbine to a load device selected from a mechanical load and an electrical load; said high pressure turbine delivering a first reduced pressure airflow to said low pressure turbine to drive said second shaft and said low pressure compressor; said low pressure turbine delivering a second reduced pressure airflow to said free turbine to drive said load device; and a starter device for causing the rotation of said high pressure spool, said starter device integrally built into one or both of said first shaft and said high pressure compressor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A gas turbine engine, comprising:
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a high pressure spool having a high pressure compressor, a high pressure turbine, and a first rotatable shaft rotatably coupling the high pressure compressor and the high pressure turbine on a first pair of bearings; a low pressure spool having a low pressure compressor, a low pressure turbine, and a second rotatable shaft rotatably coupling the low pressure compressor and the low pressure turbine; a combustor for receiving a high pressure airflow from the high pressure compressor and delivering a heated airflow to the high pressure turbine to rotatably drive the first shaft and high pressure compressor; a free turbine spool comprising a free turbine, and a free turbine shaft rotatably coupling said free turbine to a load device selected from a mechanical load and an electrical load; said high pressure turbine delivering a first reduced pressure airflow to said low pressure turbine to drive said second shaft and said low pressure compressor; said low pressure turbine delivering a second reduced pressure airflow to said free turbine to drive said load device; and a combined motor and alternator device on said high pressure spool operable to drive said first rotatable shaft for starting said gas turbine engine, said combined motor and alternator device further operable to convert rotational energy of said first rotatable shaft to electrical energy. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of starting a gas turbine engine of a type having a high pressure spool, a low pressure spool, and a combustor for receiving high pressure airflow from a high pressure compressor of the high pressure spool and delivering a heated air flow to a high pressure turbine of said high pressure spool, said method comprising:
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imparting rotation to a rotatable shaft rotatably coupling a rotor of the high pressure compressor and the high pressure turbine to start said gas turbine engine; said step of imparting rotation selected from; delivering a pressurized motive fluid to a starter turbine coupled to the rotatable shaft; and delivering a rotational force to the first shaft using a combined motor and alternator device. - View Dependent Claims (21, 22)
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Specification