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.

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Bearing box installation method and precautions:

      Bearing box installation method and precautions:

      First, the installation of the bearing box:

      1. Standard type: Several methods of installing bearing housings with snap rings and fixing plates. Mounting the bearing with the set screw will cause the bearing casing to deform and should be avoided as much as possible.

      2. Flange type: When installing flange type linear bearing, the surface precision of the bearing housing with the matching must be accurate.

      3. Adjustable type (small opening type): The bearing is perpendicular to the opening on the bearing housing, so that a uniform preload in the circumferential direction can be obtained.

      4, large opening type: If used with a suitable bearing housing, large opening bearings can also be adjusted for clearance, and even light preload.

      Second, the installation matters:

      1. When the linear bearing is installed in the bearing housing, auxiliary work should be used to avoid direct tapping of the end face or the sealing ring. The bearing should be evenly introduced, and the buffer plate should be used to load it with a gentle tap.

      2. When the optical axis is inserted into the linear bearing, the center line of the shaft and the bearing must be in line. If the shaft is inserted obliquely, the balls may fall off or cause the cage to be deformed and damage the linear bearings.

      3. The applied load should be evenly distributed over the entire bearing, especially when subjected to transient loads, two or more bearings should be used. Linear bearings are not subject to rotating loads, which can cause accidents.

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