METHODS AND DEVICES FOR LOW SPEED LOW TORQUE TESTING OF A ROTOR IN A TURBOMACHINERY

• US 20120063883A1
• Filed: 09/06/2011
• Published: 03/15/2012
• Est. Priority Date: 09/09/2010
• Status: Active Grant

• Current Assignee: Nuovo Pignone Tecnologie SRL (Nuovo Pignone International SRL)
• Original Assignee: Nuovo Pignone SPA (Nuovo Pignone International SRL)
• Inventors: Casoni, Andrea, Bagni, Gianni, BEI, Simone, Benericetti, Daniele, D'Alessandro, Guiseppe
• Granted Patent: US 9,157,373 B2
• Time in Patent Office: Days
• US Class Current: 415/1
• CPC Class Codes: F01D 21/003 Arrangements for testing or measuring for measuring vibrations G01H
• CPC Class Codes: F02C 7/275 Mechanical drives
• CPC Class Codes: F02C 9/00 Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants controlling air intakes F02C7/057; controlling turbines F01D; controlling compressors F04D27/00; controlling in general G05
• CPC Class Codes: F05D 2260/80 Diagnostics
• CPC Class Codes: F05D 2260/85 Starting
• CPC Class Codes: F05D 2270/02 to control rotational speed (n)
• CPC Class Codes: F05D 2270/304 Spool rotational speed

Abstract

Methods and devices for performing a low torque low speed test to determine whether a rotor of a turbomachinery is free to rotate are provided. A method includes automatically applying a torque to the rotor, the torque gradually increasing up to a predetermined torque value. The method further includes monitoring the speed of the rotor while the torque is gradually increased. The method also includes outputting an indication that the rotor is free to rotate after the speed of the rotor becomes positive, or outputting an indication that the rotor is locked when the speed of the rotor remains zero and the applied torque has reached the predetermined torque value.

Claims

1. A turbomachinery, comprising:

a rotor; and

a starting apparatus configured to be connected to the rotor, and including

a torque generator device configured to generate a torque to be transmitted to the rotor; and

a controller connected to the torque generator device and configured to automatically (i) control the torque generator device to output a gradually increasing torque, (ii) monitor a speed of the rotor while the torque is gradually increased, and (iii) output an indication that the rotor is free to rotate after the speed of the rotor becomes positive, or to output an indication that the rotor is locked when the speed of the rotor remains zero and the torque has reached a predetermined torque value.

2. The turbomachinery of claim 1, wherein the starting apparatus is configured to restart the turbomachinery after the indication that the rotor is free to rotate has been output.

3. The turbomachinery of claim 1, wherein the controller is configured to control the torque generator device to continue applying the torque for a predetermined time while the speed of the rotor is positive, before outputting the indication that the rotor is free to rotate.

4. The turbomachinery of claim 1, further comprising:

a rotation transmission assembly connected between the torque generator device and the rotor and configured to transmit the torque from the torque generator device to the rotor.

5. The turbomachinery of claim 1, wherein the starting apparatus is a hydraulic device.

6. The turbomachinery of claim 1, wherein the torque generator device is an expander.

7. The turbomachinery of claim 1, wherein the starting apparatus is an electric device.

8. A starting apparatus configured to start a turbomachinery, the starting apparatus comprising:

a torque generator device configured to generate a torque to be transmitted to a rotor of the turbomachinery; and

a controller connected to the torque generator device and configured (i) to control the torque generator device to output a gradually increasing torque, (ii) to monitor a speed of the rotor while the torque is gradually increased; and

(iii) to output an indication that the rotor is free to rotate after the speed of the rotor becomes positive, or to output an indication that the rotor is locked when the speed of the rotor remains zero and the torque has reached the predetermined torque value.

9. A method of performing a low torque test to determine whether a rotor in a turbomachinery is free to rotate, the method comprising:

automatically applying a gradually increasing torque to the rotor;

monitoring a speed of the rotor while the torque is gradually increased; and

outputting an indication that the rotor is free to rotate after the speed of the rotor becomes positive, or outputting an indication that the rotor is locked when the speed of the rotor remains zero and the applied torque has reached a predetermined torque value.

10. The method of claim 9, further comprising:

starting a normal operation/hot restart of the turbomachinery after outputting the indication that the rotor is free to rotate, wherein the starting of the normal operation/hot restart occurs before the speed of the rotor becomes zero.