Vibration of syngas compressor turbine
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I would like some advice. In our plant, the vibration level of the thrust bearing shaft of the syngas compressor turbine (GE) is generally within the normal range of 30–40 μm during normal operation. However, occasionally it spikes to 90 μm in an instant, causing the machine to shut down. Sometimes it’s possible to reduce the vibration levels by lowering the speed or load, but other times the spike occurs so quickly that there’s no time to make such adjustments before the machine shuts down. Some time ago, we had GE experts conduct online monitoring, and the vibration levels remained at 30–40 μm with no fluctuations, so it’s not possible to determine the cause. I’m reaching out for some guidance. When vibrations occurred again, all other process parameters were within the normal range. No pattern can be found in the vibrations.
Is the fluctuation in vibration caused by the shedding of scale from the rotor?
It can’t be scaling; I don’t think scaling has ever occurred in the steam turbine. Moreover, if scaling did break off, it wouldn’t cause the temperature to rise suddenly for a few minutes before dropping again. For now, it’s possible that frictional heat, bending, or oil film turbulence is to blame
Give the topic a like; I hope to learn from experts**
The rotor scale should not fall off frequently; it has already happened 13 times. Everything works normally after the machine stops working and then is restarted
Have you checked the contacts of the gauge points? In a few instances, the vibration levels of my turbine were affected by abnormalities in the internal contacts, which caused fluctuations in those vibration values. Fortunately, the interlock system requires both sensors to reach a certain level of vibration at the same time before shutting down the turbine, so no issues arose as a result
The instruments and processes have been checked, and there are no issues
Check the bearing shells and clearance. Backside interference fit. If there are no issues, consider whether there is any rubbing between the steam seal and the rotor
I was wondering if there are any changes in the process gas system, the steam system, and the boiler system. It’s surprising that the plant can still operate with such frequent shutdowns; there shouldn’t be any major issues with the mechanical components. The problems are likely related to the instrumentation, such as loose connections, or issues with the steam system, like steam containing water. I think what you have provided is not comprehensive. I hope to provide comprehensive information. If the issue has been resolved, please provide a detailed explanation of it
Some time ago, we hired GE experts for online monitoring. I would like to ask: by online monitoring, do you mean connecting to those GE experts through System 1’s network? Should an expert come to the site?
GE experts came to the site with the equipment, which was directly connected to the ITCC cabinet of the instruments for monitoring