Syngas compressor
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The syngas compressor consists of a turbine coupled to a low-pressure cylinder and a high-pressure cylinder. After the rotor of the high-pressure cylinder was overhauled and replaced, the wheel-end vibration was 20 microns at 300 revolutions per minute, 27 microns at 9,000 revolutions per minute, and 36 microns at 11,000 revolutions per minute. The critical speed is 12,600; help identify the cause of the vibration.
This post was last edited by lgtwhq on 2017-8-15 at 10:10. The vibration of the rotor in the high-pressure cylinder at 300 RPM is not closely related to rotor dynamic imbalance; it is mainly caused by factors such as the rotor not being aligned properly with the bearing shells, poor alignment of the rotor, and friction between the moving and stationary components during rotor replacement. Solutions to the problem: 1. Check the gap between the rotor and the stationary components to see if there are any signs of friction; if so, make adjustments to eliminate it. 2. Check the contact surfaces between the rotor and the radial bearing shells as well as the thrust bearing shells; if the contact is poor, adjust the concentricity of the radial bearing shells with respect to the rotor, and the perpendicularity of the thrust bearing shells with respect to the rotor. 3. The rotor needs to be dynamically balanced at high speeds. 4. The unit needs to be realigned and brought up to specification.
The vibration of the rotor in the high-pressure cylinder at 300 RPM is not closely related to rotor dynamic imbalance; it is mainly caused by factors such as the rotor not being aligned properly with the bearing shells, poor alignment of the rotor, and friction between the rotating and stationary components during rotor replacement. Solutions to the problem: 1. Check the gap between the rotor and the stationary components to see if there are any signs of friction; if so, make adjustments to eliminate it. 2. Check the contact surfaces between the rotor and the radial bearing shells as well as the thrust bearing shells; if the contact is poor, adjust the concentricity of the radial bearing shells with respect to the rotor, and the perpendicularity of the thrust bearing shells with respect to the rotor. 3. The rotor needs to be dynamically balanced at high speeds. 4. The unit needs to be realigned and brought up to specification.
An increase in vibration as the speed rises is usually a sign of rotor imbalance. 12,600 is the second-order critical speed, right? It’s better to conduct a spectral analysis for more accurate results. The vibration level of 36 microns is slightly high; it’s important to monitor the vibration levels during operation, and if they continue to increase, the machine should be stopped for maintenance.