Method for barring a rotor of a turbomachine and barring apparatus for conducting such method
First Claim
1. A method for barring a rotor of a thermally loaded turbomachine, comprising:
- stopping normal operation of said turbomachine;
providing a barring device for rotating said rotor about a machine axis;
coupling said barring device to said rotor; and
providing cool down of said rotor;
wherein during cool down of said rotor;
rotating said rotor by means of said barring device;
determining consecutively by measurement, a force or torque applied to said rotor by said barring device for rotating said rotor and/or the circumferential speed of the rotor during barring;
identifying a position of a bending or imbalance of said rotor based on the force or torque applied to said rotor and/or the circumferential speed of the rotor; and
controlling the rotation of said rotor by means of said barring device in dependence of said determined force or torque and/or circumferential speed in order to reduce a bending or imbalance of said rotor, which is due to a nonuniform temperature distribution on said rotor during cool down,wherein said barring device includes a shaft, a pin, and a piston, the barring device initiating a barring action on the rotor by generating, via the pin, a reciprocating movement of rotation of the shaft to drive the piston for engagement of the rotor.
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Accused Products
Abstract
A method for barring a rotor of a thermally loaded turbomachine includes stopping normal operation of the turbomachine; providing a barring device for rotating the rotor about a machine axis; coupling the barring device to the rotor; letting the rotor cool down during cool down of the rotor rotating the rotor by means of the barring device. A damage of the machine due to thermally induced buckling during the barring process is avoided by consecutively determining the force or torque applied to the rotor by the barring device for rotating the rotor and/or the circumferential speed of the rotor during barring. The rotation of the rotor is controlled by means of the barring device in dependence of the determined force or torque and/or circumferential speed in order to reduce a bending or imbalance of the rotor, which is due to a nonuniform temperature distribution on the rotor during cool down.
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Citations
14 Claims
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1. A method for barring a rotor of a thermally loaded turbomachine, comprising:
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stopping normal operation of said turbomachine; providing a barring device for rotating said rotor about a machine axis; coupling said barring device to said rotor; and providing cool down of said rotor; wherein during cool down of said rotor; rotating said rotor by means of said barring device; determining consecutively by measurement, a force or torque applied to said rotor by said barring device for rotating said rotor and/or the circumferential speed of the rotor during barring; identifying a position of a bending or imbalance of said rotor based on the force or torque applied to said rotor and/or the circumferential speed of the rotor; and controlling the rotation of said rotor by means of said barring device in dependence of said determined force or torque and/or circumferential speed in order to reduce a bending or imbalance of said rotor, which is due to a nonuniform temperature distribution on said rotor during cool down, wherein said barring device includes a shaft, a pin, and a piston, the barring device initiating a barring action on the rotor by generating, via the pin, a reciprocating movement of rotation of the shaft to drive the piston for engagement of the rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification