An apparatus for driving a load is provided. The apparatus comprises a multiple-shaft gas turbine comprising a high pressure compressor and a high pressure turbine drivingly connected to one another by a first gas turbine shaft and a low pressure compressor and a power turbine drivingly connected to
An apparatus for driving a load is provided. The apparatus comprises a multiple-shaft gas turbine comprising a high pressure compressor and a high pressure turbine drivingly connected to one another by a first gas turbine shaft and a low pressure compressor and a power turbine drivingly connected to one another by a second gas turbine shaft extending coaxial with the first gas turbine shaft, the high pressure compressor and the high pressure turbine. The apparatus also comprises a load coupling drivingly connecting the power turbine to the load and a dual-speed turning gear with an output shaft drivingly engageable to and disengageable from the load, the dual-speed turning gear comprising a low speed turning motor and a high speed turning motor, wherein the low speed turning motor and the high speed turning motor are configured to selectively drive the load.
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1. An apparatus for driving a load, the apparatus comprising: a multiple-shaft gas turbine comprising: a high pressure compressor and a high pressure turbine drivingly connected to one another by a first gas turbine shaft;a low pressure compressor and a power turbine drivingly connected to one anoth
1. An apparatus for driving a load, the apparatus comprising: a multiple-shaft gas turbine comprising: a high pressure compressor and a high pressure turbine drivingly connected to one another by a first gas turbine shaft;a low pressure compressor and a power turbine drivingly connected to one another by a second gas turbine shaft extending coaxial with the first gas turbine shaft, the high pressure compressor and the high pressure turbine;a load coupling drivingly connecting the power turbine to the load; anda dual-speed turning gear comprises a first worm gear and a second worm gear with an output shaft drivingly engageable to and disengageable from the load, the dual-speed turning gear comprising a low speed turning motor and a high speed turning motor, wherein the low speed turning motor and the high speed turning motor are configured to selectively drive the load, wherein the dual-speed turning gear is configured to slow-roll the load, the power turbine, and the low pressure compressor when the gas turbine is shut down and rotate the power turbine, the low pressure compressor, and the load during offline washing of the gas turbine, andwherein a shaft of the second worm gear is connected on a first end to the low speed turning motor and at a second end to the high speed turning motor, and wherein a clutch is arranged between the second end of the shaft of the second worm gear and an output shaft of the high speed turning motor such that when the rotary speed of the output shaft of the high speed turning motor exceeds the rotary speed of the shaft of the second worm gear, the high speed turning motor takes control over the second worm gear. 2. The apparatus according to claim 1, wherein an auxiliary turning motor is configured to perform at least one of starting rotation of the high pressure compressor and the high pressure turbine and slow-turning the high pressure compressor and the high pressure turbine. 3. The apparatus according to claim 1, wherein the load comprises at least one centrifugal compressor. 4. The apparatus according to claim 1, wherein the load comprises a plurality of centrifugal compressors. 5. The apparatus according to claim 1, wherein the dual-speed turning gear comprises an overrunning clutch to disengage the low speed turning motor from the output shaft of the dual-speed turning gear when the high speed turning motor accelerates the output shaft beyond a maximum speed provided for by the low speed turning motor. 6. The apparatus according to claim 5, wherein the dual-speed turning gear comprises a clutch arrangement arranged so that the output shaft of the dual-speed turning gear is rotated by the low speed turning motor to a first rotary speed, and is rotated by the high speed turning motor when the rotary speed of the output shaft exceeds the first rotary speed. 7. The apparatus according to claim 6, wherein the dual-speed turning gear comprises an overrunning clutch arranged between the low speed turning motor and the output shaft such that the high speed turning motor takes over control of the output shaft once the speed of the output shaft exceeds the speed imposed by the low speed turning motor. 8. The apparatus according to claim 1, wherein the dual-speed turning gear comprises a first clutch selectively engaging and disengaging the output shaft of the dual-speed turning gear to and from the load, and a second clutch selectively engaging and disengaging the low speed turning motor to and from the output shaft. 9. The apparatus according to claim 1, wherein the dual-speed turning gear comprises at least one worm gear. 10. The apparatus according to claim 1, wherein the rotary speed of the low speed turning motor is transmitted to the output shaft of the dual-speed turning gear through the first worm gear and the second worm gear in series. 11. The apparatus according to claim 1, wherein the rotary speed of the high speed turning motor is transmitted to the output shaft of the dual-speed turning gear through the second worm gear. 12. The apparatus according to claim 1, wherein the dual-speed turning gear is configured to drive the apparatus during offline washing of the gas turbine by initially accelerating the load, the low pressure compressor and the power turbine from a stationary condition to a first rotary speed with the low speed turning motor, and subsequently by further accelerating the load, the low pressure compressor and the power turbine from the first rotary speed to a second rotary speed, wherein the second rotary speed is higher than the first rotary speed. 13. The apparatus according to claim 1, wherein the low speed turning motor and the high speed turning motor are arranged such that during slow-rolling of the load, rotation of the load is controlled by the low speed turning motor. 14. The apparatus according to claim 1, further comprising an auxiliary turning motor configured to drive the high pressure compressor and the high pressure turbine into rotation, wherein the auxiliary turning motor is configured to operate as at least one of a slow-rolling motor for slow-turning the high pressure compressor and the high pressure turbine following shut down of the gas turbine, and a starter for starting rotation of the high pressure compressor and the high pressure turbine when the gas turbine is started. 15. A method for offline washing of a multiple shaft gas turbine connected to a load, the gas turbine comprising a high pressure compressor and a high pressure turbine drivingly connected to one another by a first gas turbine shaft, a low pressure compressor and a power turbine drivingly connected to one another by a second gas turbine shaft extending coaxial with the first gas turbine shaft, the high pressure compressor and the high pressure turbine, the method comprising: providing a dual-speed turning gear comprising a first worm gear and a second worm gear with an output shaft drivingly engageable to and disengageable from the load, wherein the dual-speed turning gear comprises a low speed turning motor and a high speed turning motor, slow-rolling, using the dual-speed turning gear, the load, the power turbine, and the low pressure compressor when the gas turbine is shut down and rotating the power turbine, the low pressure compressor, and the load during offline washing of the gas turbine;initially accelerating the low pressure compressor, the power turbine and the load with the low speed turning motor up to a first rotary speed;when the first rotary speed is reached, continuing accelerating the low pressure compressor, the power turbine and the load with the high speed turning motor until an offline washing rotary speed is reached;maintaining the offline washing rotary speed while washing the gas turbine; andtaking control, using the high speed turning motor, over the second worm gear if a rotary speed of an output shaft of the high speed turning motor exceeds a rotary speed of a shaft of the second worm gear, wherein a shaft of a second worm gear is connected on a first end to the low speed turning motor and at a second end to the high speed turning motor, and wherein a clutch is arranged between the second end of the shaft of the second worm gear and the output shaft of the high speed turning motor. 16. The method according to claim 15, further comprising accelerating the high pressure compressor and the high pressure turbine using an auxiliary turning motor. 17. The method according to claim 15, further comprising: shutting down the gas turbine; andslow-rolling the load, the low pressure compressor and the power turbine using the low speed turning motor until a required temperature profile of the load is achieved. 18. The method according to claim 15, wherein the load comprises at least one compressor. 19. The method according to claim 15, wherein the load comprises a train of compressors. 20. The method according to claim 15, further comprising slow-rolling the high pressure turbine and the high pressure compressor of the gas turbine using an auxiliary turning motor after shut-down of the gas turbine. 21. A method of offline washing of a multi-shaft gas turbine and a load connected to the gas turbine, the gas turbine comprising a high pressure compressor and a high pressure turbine drivingly connected to one another by a first gas turbine shaft, a low pressure compressor and a power turbine drivingly connected to one another by a second gas turbine shaft extending coaxial with the first gas turbine shaft, the high pressure compressor and the high-pressure turbine, the method comprising: providing a dual-speed turning gear comprising a first worm gear and a second worm gear with an output shaft drivingly engageable to and disengageable from the load, wherein the dual-speed turning gear comprises a low speed turning motor and a high speed turning motor;selectively slow-rolling the load and the second gas turbine shaft at a slow-rolling speed with the low speed turning motor during cooling of the gas turbine and the load following shut-down of the gas turbine; orrolling the load and the second gas turbine shaft at an offline washing speed, with the high speed turning motor during offline washing of the gas turbine, the offline washing speed being higher than the slow-rolling speed; andtaking control, using the high speed turning motor, over the second worm gear if a rotary speed of an output shaft of the high speed turning motor exceeds a rotary speed of a shaft of the second worm gear, wherein a shaft of the second worm gear is connected on a first end to the low speed turning motor and at a second end to the high speed turning motor, and wherein a clutch is arranged between the second end of the shaft of the second worm gear and the output shaft of the high speed turning motor. 22. The method according to claim 21, further comprising slow-rolling the high pressure compressor and the high pressure turbine with an auxiliary turning motor following shut-down of the gas turbine.
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이 특허에 인용된 특허 (6)
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Schneider Raymond C. (Rockford IL) Meyer Robert W. (Pecatonica IL) Borgelt Gerald C. (Rockford IL), Power transmitting mechanism for starting a high inertia load and having retarder means for auxiliary starting motor.
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