Solutions for excessive temperature of thrust bearings during turbine operation.
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The turbine is running at no load; the temperatures of the main and auxiliary thrust bearings are too high. The diameter of the thrust disc is large, and there are still 2,000 revolutions left to reach the rated speed. The temperature of the lubricating oil entering the system is 40 degrees. Please help, experts
It is recommended to lower the lubricating oil temperature slightly to see the effect, aiming to keep it around 35°C.
Currently, increasing the thrust clearance and the clearance of the return oil baffle in the thrust bearing has had little effect.
What about the pressure of the imported lubricating oil and the temperature of the oil at the outlet? Has the displacement increased significantly compared to before? If the vibration displacement is normal, adjust the oil pressure.
Control the turbine back pressure at its upper limit whenever the operating conditions permit. Check if there have been any changes in operating conditions. Increase the lubricating oil pressure entering the thrust bearing pads and control it at the upper limit.
The oil temperature is a bit high, it’s around 35 for us