Reason analysis and treatment measures for high bearing temperature

     This paper analyzes several reasons for the high bearing temperature of boiler rotating equipment in thermal power plants, and proposes corresponding preventive measures. High bearing temperature is a common and harmful fault of rotating equipment, which will reduce the service life of the bearing and increase the maintenance cost. When the temperature rises faster and the temperature exceeds the standard, it will easily lead to unplanned outage or reduced load operation. The economic benefits have a great impact. Therefore, it is the guarantee for the continuous and safe operation of the equipment to quickly determine the cause of the fault and take appropriate measures to solve it.

1 Common causes of excessive bearing temperature

1) Poor lubrication, such as insufficient lubrication or excessive lubrication, the quality of the lubricant does not meet the requirements, deterioration or debris;
2) insufficient cooling, such as blockage of the pipeline, improper selection of the cooler, and poor cooling effect;
3) Abnormal bearing, such as bearing damage, poor bearing assembly process, gap adjustment of each part of bearing housing does not meet the requirements;
4) The vibration is large. If the coordinating process of the coupling does not meet the requirements, the rotor has dynamic and static imbalance, the basic rigidity is poor, the ground is weak, the rotation stalls and the surge.

2 solutions

When the bearing temperature is high, the problem should be solved from the following aspects:
1) The amount of oil added is not appropriate, and the grease is too little or too much. The bearing housing should be refueled regularly as required by the job. After the bearing is refueled, sometimes the temperature will be high, mainly due to excessive refueling. At this time, the temperature continues to rise. After reaching a certain point (generally about 10 ° C ~ 15 ° C higher than the normal operating temperature) will remain unchanged, and then gradually decline.
2) The grease added to the bearing does not meet the requirements or is contaminated. The lubricating grease is not suitable for selection, and it is not easy to form a uniform lubricating oil film. The internal friction and wear of the bearing cannot be reduced, the lubrication is insufficient, and the bearing temperature is increased. When different types of grease are mixed, a chemical reaction may occur, causing the grease to deteriorate and agglomerate, reducing the lubricating effect. The contamination of the grease will also increase the temperature of the bearing, and the dust will fall into the process of adding grease, causing oil contamination, resulting in deterioration of the grease inside the bearing housing, which will damage the bearing lubrication and increase the temperature. Therefore, suitable grease should be selected. The bearing box and bearing should be cleaned during maintenance, and the fueling pipeline should be checked and unblocked. Different types of grease should not be mixed. If other types of grease are replaced, the original grease should be cleaned first; Add grease regularly, and grease should be properly stored to prevent moisture and dust.
3) Cooling is not enough. Check if the pipeline is blocked, whether the inlet temperature and return water temperature exceed the standard. If the cooler is not suitable for use and the cooling effect is poor and cannot meet the requirements for use, it should be replaced in time or a new cooler installed in parallel. The axial flow induced draft fan should also check the insulation and sealing of the core barrel.
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