Fluctuations in the temperature of the turbine’s rear bearing
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The propylene unit adopts a 1:1 configuration; the turbine is of the condensing type. The rear bearing is of the five tilting pad type. The temperature of the lower pad of the rear bearing fluctuates frequently, generally rising from around 88°C to around 100°C before dropping back to around 88°C. The temperature of the side pads fluctuates by about 2°C, with relatively small amplitude of variation. I don’t know what caused it.
It could be caused by a carbon deposit coating on the bearing bush. The bearing surfaces are the areas where the most heat is generated in the system. Oxidation and thermal decomposition of the lubricating oil on these surfaces easily lead to the formation of varnish layers. The accumulation of such varnish layers further accelerates the oxidation of the oil, causing an increase in the temperature of the bearing surfaces and the formation of additional varnish layers. Sometimes the paint coating also peels off as the equipment operates, when the temperature drops ； If a new paint film forms, the temperature will rise again. Check the tendency of the paint film to slide. You can add me on QQ at 214962373 or on WeChat at 18015536808; I have proven solutions to various issues.
How often are the physical and chemical analyses of the oil performed?
Analyze it once a month. The analysis indicators are quite simple; complex ones cannot be handled.
How to check the tendency value of paint film sliding? Is it necessary to shut down the machine?
1. Fluctuations in oil temperature indicate unstable formation of the oil film; either too high or too low oil temperatures can lead to unstable oil film formation. Check whether the oil temperature is within the normal range. 2. Check whether the oil pressure is normal; too low pressure may result in poor formation of the oil film. Ensure that the oil pressure is within the normal range. 3. In the case of a compressor that is being dragged, the load changes, and as a result the torque on the shaft changes as well, which undermines the stability of the shaft and disrupts the stable operating conditions of the compressor. 4. Check whether the oil return temperature is normal, and whether there is a fault in the instrumentation measurement system; inspect the instrument connections. 5. Under feasible conditions, disassemble the bearing to check whether the installation clearance is within the acceptable range.
The oil temperature is maintained within the range of 40–41°C; the process requires frequent adjustments to this temperature, with adjustments being made almost every shift. The load has not changed. It is only the temperature of the lower bearing pad behind the turbine that fluctuates greatly; the temperatures of the other bearings do not fluctuate.
There is no need to take oil samples for analysis by a third party.
We can also provide a free inspection; if needed, please contact me :)
If it is possible to keep operating and the economic benefits justify it, production should be continued. If there are plans and opportunities for maintenance, the bearing housings should be opened to maintain the proper gaps between various components. The preload on the bearing shells or the bearing gaps may be around the minimum value, and if there are signs of carbonization on the bearing shells, the gaps should be adjusted and the surface of the bearing shells cleaned