Axial shift of steam turbine

Axial shift is an important parameter in the operation of steam turbines.

It refers to the movement of the rotor along the axial direction.

In a steam turbine, the rotor is supported by bearings and is subject to axial and radial loads due to the flow of steam and the weight of the rotor itself.

Axial shift can be caused by a variety of factors, including thermal expansion, changes in steam flow rate or pressure, and imbalances in the rotor due to manufacturing tolerances or wear. When the axial shift exceeds certain limits, it can cause damage to the turbine, leading to decreased performance and even catastrophic failure.

To monitor and control axial shift in a steam turbine, a variety of techniques are used, including the following:

1. Axial displacement probes: These probes are installed on the turbine casing and are used to measure the axial displacement of the rotor. This information can be used to adjust the position of the bearings and prevent excessive axial movement.

2. Balancing: The rotor can be balanced by adding or removing weight to ensure that the center of mass is located at the center of rotation. This helps to minimize the forces acting on the bearings and reduce the potential for axial shift.

3. Control systems: Modern steam turbines are equipped with sophisticated control systems that monitor a variety of parameters, including axial shift, and can adjust the operation of the turbine to prevent damage.

Overall, axial shift is an important parameter in the operation of steam turbines, and proper monitoring and control are essential to ensure safe and reliable operation.