Eccentricity of steam turbine

In a steam turbine, eccentricity can be caused by a variety of factors, including manufacturing tolerances, wear, and uneven thermal expansion.

Some of the effects of eccentricity in a steam turbine include:

1. Vibration: Eccentricity can cause increased vibration in the turbine, which can lead to damage to the bearings and other components.
2. Reduced efficiency: Eccentricity can result in uneven loading of the turbine blades, reducing the overall efficiency of the turbine.
3. Increased stress: Eccentricity can cause increased stress on the turbine blades, which can lead to fatigue and failure.

To monitor and control eccentricity in a steam turbine, several techniques are used, including:

1. Shaft alignment: Proper shaft alignment during installation and maintenance can help to minimize eccentricity.
2. Bearing monitoring: Monitoring the condition of the bearings can help to detect changes in eccentricity and other parameters that can affect turbine performance.
3. Vibration monitoring: Vibration sensors can be installed on the turbine to detect changes in vibration levels that may indicate eccentricity.
4. Thermal monitoring: Monitoring the temperature of the turbine components can help to detect uneven thermal expansion that may be contributing to eccentricity.

Eccentricity during turbine rolling

Rolling eccentricity refers to the deviation of the centerline of the rotating element, such as a steam turbine rotor, from its true axis of rotation during startup or shutdown of the turbine.

During the startup or shutdown of a steam turbine, the rotor may experience thermal expansion or contraction due to changes in temperature, which can lead to rolling eccentricity. This can cause increased vibration, increased stress on the turbine components, and reduced turbine efficiency.

To monitor and control eccentricity during turbine rolling, several techniques are used, including:

1. Thermal monitoring: Monitoring the temperature of the turbine components can help to detect uneven thermal expansion that may be contributing to rolling eccentricity.

2. Shaft alignment: Proper shaft alignment during installation and maintenance can help to minimize eccentricity during rolling.

3. Bearing monitoring: Monitoring the condition of the bearings can help to detect changes in eccentricity and other parameters that can affect turbine performance.

4. Vibration monitoring: Vibration sensors can be installed on the turbine to detect changes in vibration levels that may indicate rolling eccentricity.

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

Overall, monitoring and controlling eccentricity during turbine rolling is an important part

Eccentricity during turbine rolling

Eccentricity in a rotating steam turbine can be measured by using several techniques, including the following:

1. Shaft displacement probes: These probes are installed on the turbine casing and are used to measure the displacement of the rotor shaft. This information can be used to determine the magnitude and direction of eccentricity.

2. Vibration monitoring: Vibration sensors can be installed on the turbine to detect changes in vibration levels that may indicate eccentricity. By analyzing the frequency and amplitude of the vibration signals, the degree of eccentricity can be estimated.

3. Laser measurement: Laser measurement techniques can be used to measure the position of the rotor and determine the degree of eccentricity. This technique involves shining a laser beam on the rotor and measuring the reflected light to determine the position of the rotor.

4. Eddy current measurement: Eddy current sensors can be used to measure the position of the rotor and detect changes in eccentricity. This technique involves using a probe to generate an electromagnetic field and measuring the induced current in the rotor to determine its position.

Positive & Negative eccentricity of steam turbine

In a steam turbine, eccentricity refers to the deviation of the centerline of the rotating element, such as the rotor, from its true axis of rotation. Eccentricity can be either positive or negative, depending on the direction of deviation.

Positive eccentricity occurs when the centerline of the rotor is displaced in a direction that is away from the casing. This means that the rotor is closer to one side of the casing and farther away from the other side. Positive eccentricity can cause the rotor to rub against the casing, which can lead to increased vibration and stress on the turbine components.

Negative eccentricity occurs when the centerline of the rotor is displaced in a direction that is towards the casing. This means that the rotor is farther away from one side of the casing and closer to the other side. Negative eccentricity can cause the rotor to vibrate excessively and lead to increased stress on the turbine components.

Both positive and negative eccentricity can be harmful to the turbine and should be monitored and controlled. Proper monitoring and control of eccentricity are important to ensure safe and efficient operation of the turbine and to avoid damage to the turbine components. Techniques such as shaft displacement probes, vibration monitoring, laser measurement, and eddy current measurement can be used to detect and measure eccentricity in a steam turbine.

How eccentricity control during steam turbine rolling at rated speed

One technique for controlling eccentricity during steam turbine rolling at rated speed is proper shaft alignment. The alignment of the rotor shaft should be checked regularly to ensure that it is properly aligned with the casing. Any misalignment should be corrected to minimize eccentricity and reduce stress on the turbine components.

Another technique is thermal monitoring. Uneven thermal expansion or contraction of the turbine components can cause changes in the eccentricity of the rotor. By monitoring the temperature of the turbine components, adjustments can be made to minimize thermal expansion or contraction and maintain the centerline of the rotor as close to the true axis of rotation as possible.

Bearing monitoring is also important for controlling eccentricity during steam turbine rolling at rated speed. The bearings should be properly lubricated and checked regularly for wear or damage. Any issues with the bearings should be addressed immediately to prevent increased vibration and stress on the turbine components.

Vibration monitoring can also be used to control eccentricity during steam turbine rolling at rated speed. Vibration sensors can be installed on the turbine to detect changes in vibration levels that may indicate eccentricity. By analyzing the frequency and amplitude of the vibration signals, the degree of eccentricity can be estimated and corrective actions can be taken.

Parameter which affects the eccentricity of steam turbine.

Several parameters can affect the eccentricity of a steam turbine, which refers to the deviation of the centerline of the rotating element, such as the rotor, from its true axis of rotation. Some of the parameters that can affect eccentricity include:

1. Thermal expansion and contraction: Uneven thermal expansion or contraction of the turbine components can cause changes in the eccentricity of the rotor. This can occur due to differences in temperature between the various turbine components, as well as due to changes in the operating conditions of the turbine.

2. Rotor alignment: The alignment of the rotor shaft with respect to the casing can affect the eccentricity of the rotor. Any misalignment can cause the rotor to deviate from its true axis of rotation and increase eccentricity.

3. Bearing wear: Wear or damage to the bearings can cause changes in the eccentricity of the rotor. Bearings should be properly lubricated and checked regularly for wear or damage to prevent increased vibration and stress on the turbine components.

4. Rotor weight distribution: The weight distribution of the rotor can affect its eccentricity. If the weight is unevenly distributed, it can cause the rotor to deviate from its true axis of rotation and increase eccentricity.

5. Manufacturing tolerances: Small manufacturing variations in the rotor and other turbine components can cause changes in the eccentricity of the rotor. These tolerances should be accounted for during the design and manufacturing process.