Process vibration trend The total axis of the unit diagram trajectory diagram before and after the alarm changes the maximum speed below 50 rpm, oil temperature, oil pressure changes are small, no large fluctuations, the temperature of the thrust tile does not change much before the alarm, and from 11.20 days later From 69 ° C to the current 82.7 ° C, the increase rate is 13.7 ° C, the lubricating oil inlet temperature is 43.3 ° C, the oil pressure 0.14MPa no large fluctuations.
(2) Monitoring and analysis According to the above actual situation and online monitoring, there are reasons: 1 and the field instrument display card and LCD display error.
2 The variable load of the compressor process condition reduces the flow rate of the gas flowing through the compressor to a certain extent, and the unit generates a rotating stall. After the occurrence, the rotor generates a large axial exciting force, so that the shaft displacement is further increased to reach the alarm; The fluctuation of the inlet and outlet pressures causes a surge phenomenon.
On-site process: a section of inlet pressure 0.52MPa, three sections of outlet pressure 5.2MPa, a section of inlet air temperature of 15 ° C, three sections of outlet temperature of 82 ° C, compressor support bearing temperature TI-5623, TI-5624 are 56 ° C, 67 ° C, respectively The thrust bearing temperatures TI5621 and TI5622 are 81°C and 55°C respectively; so far, the thrust bearing temperature TI5621 has risen to “85°Câ€, and the three-stage outlet flow rate fluctuates between 9194T/h. Under the rated working condition, the inlet flow rate of the compressor should be 134.345T/h, and the actual flow rate is 126T/h. This process condition is lower than the design condition before and after the alarm.
Measures (1) Open the large compressor return valve to increase the inlet flow of the compressor by means of backflow.
(2) Increasing the oil pressure of the lubricating oil inlet and lowering the oil temperature to suppress or eliminate the tendency of the vibration to increase.
(3) Change the speed and increase the flow rate (because the actual flow is less than the rated flow).
If the above suggestions are not achieved, in order to minimize the loss, the thrust tile should be stopped according to the actual situation. During the inspection, if there is a slight wear scar on the main thrust tile, the shaft and the thrust plate are worn out, and the new thrust tile is replaced and replaced, and the rated process parameters of the compressor are adjusted.
After testing, the axial displacement dropped significantly to about 260 μm.
Conclusion The variable load of the compressor process conditions makes the compressor surge and rotational stall is the main cause, followed by the surge; after the occurrence, the rotor generates a large axial excitation force, which further increases the shaft displacement to reach the alarm. In order to strengthen the predictive maintenance of key equipment, the state monitoring technology of large rotating machinery is used to continuously monitor the large-scale units around the clock, and continuously send real-time data to the maintenance unit, and timely feedback to the scene when problems are found.
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