添加人：吳小姐 發(fā)布時間：2021-1-29 9:28:50 來源：廣州市鑫風風機有限公司
It is equipped with two double suction centrifugal fans, but in practical application, it is found that one of them has the problem of abnormal bearing temperature rise for many times. We know that if the bearing temperature is abnormal, it should be handled in time, otherwise it will affect the safe and stable operation of the centrifugal fan. What are the main reasons for the abnormal temperature rise of centrifugal fan bearing?
Now let's analyze the reasons. The reason for such a problem may be that there are some defects in the quality of the centrifugal fan itself. However, during the on-site inspection, it was found that the bearing oil level was normal, the lubricating oil quality test results showed no deterioration, and the bearing cooling water volume was normal. Combined with the analysis and comparison of abnormal conditions, it is confirmed that the quality of the equipment is normal.
After eliminating this reason, it may be the problem of bearing temperature rising caused by load fluctuation. Usually, when the speed of the centrifugal fan is fixed, the change of its current value can reflect the fluctuation of the load acting on the fan. And because the load is ultimately acting on the bearing, it will lead to the change of friction between the dynamic and static parts of the bearing. The increase of friction will naturally produce a lot of heat, leading to the rise of temperature.
According to the analysis of the production situation on site, in fact, in the process of desulfurization system operation, there is a problem of sudden increase of flue gas density. The increase of flue gas density will directly increase the load acting on the bearing of centrifugal fan, so the friction force on the bearing will increase significantly, and then the temperature rise range will exceed the allowable range of the bearing, which will aggravate the temperature rise of the bearing.
In addition, the rise of flue gas temperature in the work site will also have a certain impact. That is to say, during the operation of the centrifugal fan, the load on the bearing increases due to the increase of the flue gas temperature and density at the working site. At the same time, the bearing clearance is smaller due to the increase of the flue gas temperature, the friction between the dynamic and static increases, and the bearing temperature further increases.