Method for coupling a steam turbine and a gas turbine at a desired differential angle using a setpoint acceleration

Patent metadata

Field	Value
Publication number	US-10690012-B2
Application number	US-201716099858-A
Country	US
Kind code	B2
Filing date	Apr 20, 2017
Priority date	May 18, 2016
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A method for coupling a rotating device, in particular a steam turbine, and a shaft device, in particular a gas turbine, having the following steps: detecting a differential angle between the shaft device and the rotating device; detecting a differential speed between the shaft device and the rotating device; predicting a coupling angle at which the rotating device and the shaft device would be coupled if the rotating device were accelerated with a known acceleration up to the start of the coupling-in; comparing the predicted coupling angle with a target coupling angle, and calculating therefrom a setpoint acceleration such that the predicted coupling angle matches the target coupling angle.

First claim

The invention claimed is:

1. A method for coupling a rotating device and a shaft device, comprising:
detecting a differential angle between the shaft device and rotational device;
detecting a differential speed between the shaft device and rotational device;
predicting a coupling angle at which the rotational device and shaft device would be coupled if the rotational device were accelerated with a known acceleration up to a start of a coupling process;
comparing the predicted coupling angle with a target coupling angle and calculating therefrom a setpoint acceleration in such a way that the predicted coupling angle corresponds to the target coupling angle.

2. The method as claimed in claim 1 ,
wherein the prediction is based on an assumption that the start of the coupling process takes place as soon as the rotational speed of the rotating device reaches the rotational speed of the shaft device or exceeds it by a selected value.

3. The method as claimed in claim 1 ,
wherein the calculated setpoint acceleration serves as a value for the known acceleration.

4. The method as claimed in claim 1 ,
wherein the rotational device is accelerated up to an output rotational speed which is below the rotational speed of the shaft device, with a selected acceleration independently of an aimed-at target coupling angle.

5. The method as claimed in claim 4 ,
wherein the selected acceleration is constant.

6. The method as claimed in claim 3 ,
wherein the prediction of the coupling angle is started when an output rotational speed is reached with a selected acceleration.

7. The method as claimed in claim 3 ,
wherein an output rotational speed is approximately 0.5 Hz up to approximately 1.5 Hz below the rotational speed of the shaft device.

8. The method as claimed in claim 1 ,
wherein during the calculation of the setpoint acceleration it is noted that during the coupling process the differential angle is changed by a coupling rotational angle.

9. The method as claimed in claim 1 ,
wherein the setpoint acceleration is converted into a setpoint rotational speed which is transferred to a turbine control unit.

10. An arrangement having a shaft device and a rotating device, having a clutch for coupling the shaft device and rotating device, comprising:
a device for detecting a differential angle between the shaft device and rotating device;
a device for detecting a differential speed between the shaft device and rotating device;
a device for accelerating the rotating device with an acceleration value;
a prediction module that predicts, from the detected differential angle, the detected differential speed and a known acceleration, a coupling angle which would occur if the rotating device were accelerated with the known acceleration up to a start of the coupling; and
an acceleration module which compares the predicted coupling angle with a target coupling angle and calculates therefrom a setpoint acceleration such that the predicted coupling angle corresponds to the target coupling angle are present.

11. An arrangement comprising:
a shaft device, a rotating device, and a clutch for coupling the shaft device to the rotating device; and
a control unit designed to carry out a method as claimed in claim 1 .

12. The arrangement as claimed in claim 10 ,
wherein the detection of the differential angle is determined with a clock rate of approximately 4 ms up to approximately 20 ms or lower.

13. The method as claimed in claim 7 ,
wherein the output rotational speed is approximately 0.9 Hz up to approximately 1.1 Hz below the rotational speed of the shaft device.

14. The method as claimed in claim 1 ,
wherein the rotating device is a steam turbine and wherein the shaft device is a gas turbine.

15. The arrangement as claimed in claim 10 ,
wherein the rotating device is a steam turbine and wherein the shaft device is a gas turbine.

Assignees

• Siemens Ag

Inventors

• Borowski Marc
• Zimmer Gerta

Classifications

• F01K23/16 Primary

  all the engines being turbines (F01K23/14 takes precedence) · CPC title

• F16D23/10

  automatically producing the engagement of the clutch when the clutch members are moving at the same speed; Indicating synchronisation · CPC title

• F16D2500/30426

  Speed of the output shaft · CPC title

• F16D2500/3021

  Angle · CPC title

• F16D2500/30415

  Speed of the input shaft · CPC title