The reason for the increase of vibration of the air compressor and the sudden deterioration of the bearing vibration of the unit in the optimal operation area, especially the horizontal vibration of the 1st and 8th bearings is the largest and irregular wave type, and the vibration value of the bearing before and after the vibration increase of the unit is seen. The sub-system needs to adjust the opening degree of the inlet guide vanes 7 times due to the working conditions, and stop the machine once. After nearly two months, the tracking test records of the bearing point vibrations are analyzed and analyzed, and the trend diagram of the bearing vibration deterioration tendency and the guide vane opening degree map are drawn.
The main reason for the vibration of the unit is the influence of the change of the air intake of the air compressor, that is, the frequent opening and closing of the guide vane. In addition, the air compressor has a problem of an optimal operating area and a poor operating area. It can be seen that when the vane opening degree is 015 or greater than 32, the vibration of each bearing is relatively small, and the unit is in a stable state; at 1531, the vibration of each bearing is the largest and the unit is in a deteriorated state. At the same time, it was found that the daily power consumption of different vane opening units is also different.
The study of different guide vane opening and daily power consumption graphs of the unit found that when the inlet guide vane opening degree is 34, the average daily electricity consumption is 54240 degrees; when the inlet guide vane opening degree is 0, the average daily electricity consumption is 55640 degrees. . According to the above analysis, the operating unit was instructed in time, and under the conditions of various working conditions, the inlet guide vanes of the air compressor were gradually adjusted to 34, and the horizontal vibration of the bearings at 1 and 8 points gradually decreased to 58 m, and the unit operated smoothly. In addition, compared with the guide vane opening degree of 0, the power saving is 1400 degrees per day, and the annual electricity saving is 511,000 degrees, which is about 180,000 yuan.
The diagnosis of the high temperature of each bearing of the unit was found in the inspection. The temperature of each bearing of the unit was generally too high. The maximum time was 64 (alarm value 70). See the bearing temperature, alarm value and vibration value of the unit.
Unit bearing temperature, alarm value and vibration value The actual temperature alarm value of each bearing point Each vibration value (m) (horizontal direction) 1527072537053577084557085577086567076470 862706 The temperature of each bearing point is too high, the analysis believes that the cause of the bearing temperature is too high: bearing vibration Large, oil film is partially destroyed; % cooling water temperature is too high, resulting in oil temperature increase, and finally reflected that the bearing temperature is too high; the oil pressure inside the bearing is too low, the oil film can not be fully formed, resulting in excessive bearing temperature.
As can be seen from the above, each bearing has a maximum vibration value of 8m, which is in good condition; for % at the time of the end of winter and early spring, the ambient temperature is only 440, the circulating water temperature is 26, and the returning temperature is 30. Therefore, the bearing temperature is too high is not cooling. The water is too high; for, the inspection found that the unit oil pump after the pressure of the pump partial pressure actual bearing oil pressure and technical requirements oil pressure comparison of each bearing point actual oil pressure (kgf / cm2) technical requirements oil pressure (kgf / cm2) 10.60 .51.020.70.51.031.451.52.041.601.52.051.551.52.061.501.52.071.301.52.081.451.52.0 low (2.9kgf/cm2 dropped to 2.60kgf/cm2, technical requirements 3.0kgf/cm2) and showed a downward trend, each The oil pressure of the bearing is also below or close to the lower limit of the technical requirements.
Adjusted bearing oil pressure and temperature After adjusting each bearing point, the bearing oil pressure (kgf/cm2) is adjusted. The bearing temperature is 10.854520.904631.754941.804851.804761.754871.855481.85522.3 Air compressor five-stage shaft seal water diagnostic vacuum machine Since it was put into production, there have been long-term five-stage shaft seals with water. This phenomenon indicates that there is excessive precipitation of condensed water in the air compressor and there is no timely discharge or cooling water leaking from the inside of the cooler. The water in the air compressor has a serious destructive effect on the rotor, such as damage to the dynamic balance of the rotor, causing vibration, damage to the bearing, collision of the casing and the like.
After the air compressor was inspected, after several months of observation and research analysis, through the pressure test of the cooler, the water in the air compressor was excluded from the cooling water leaking from the inside of the cooler, but only the compressed air. The condensed water deposited in the middle is not caused by timely discharge. The generation of condensed water is mainly caused by the temperature difference of the cooling water (mainly due to the excessive change of water temperature and water pressure). (The water temperature varies from 2534 in one day, the water pressure varies from 2.52.9kgf/cm2), resulting in compressed air. Excessive condensed water is precipitated and cannot be separated and discharged in time, and is taken out from the five-stage shaft seal. In addition, the change in humidity in the air is also one of the causes of the slight change in the condensed water precipitated. Therefore, the temperature difference of the cooling water should not be greater than 5, the water pressure change is not more than 0.25kgf/cm2, and the condensed water is discharged once every 2h, thus effectively solving the phenomenon of water in the air compressor.
Conclusion The comprehensive diagnosis of the air compressor, that is, multi-level diagnostic analysis, based on the existing testing instruments, sensory diagnosis, simple diagnosis and the company's sophisticated diagnosis. In the inspection, not only must we carefully record and record various data, capture various abnormal phenomena of the equipment, but also draw a trend graph of equipment degradation tendency according to the test record data, combined with the various equipment anomalies captured, and conduct research and analysis one by one. The cause of the problem and the improvement measures are extended to the energy saving and consumption reduction of the equipment, the usable limit of the main equipment, the optimal operating area of ​​the equipment, etc., to achieve normal operation of the compressor over-period.
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