Analysis of Bearing Vibration Issues in the 9-19 High-Pressure Centrifugal Fan

Analysis of Bearing Vibration Issues in the 9-19 High-Pressure Centrifugal Fan

During the operation of the 9-19 high-pressure centrifugal fan, if significant bearing vibration is detected, this indicates several potential issues. Do you know why this occurs? If such a problem arises, what measures should be taken? Below, we will analyse these two issues. Based on this situation, there are two main reasons. One reason is that when the boiler is in continuous operation—a common scenario—vibration in the 9-19 high-pressure centrifugal fan may cause dust to accumulate on the non-working surface of the blades. The primary symptom is a sudden increase in vibration when the 9-19 high-pressure centrifugal fan starts up. This is because, as gas enters the impeller, to maintain the blades’ rotational angle, dust particles gradually accumulate on the non-working surface over time. As it is difficult to maintain the uniformity of these dust deposits, this will have a certain impact on the quality of the impeller, which may consequently increase the vibration of the 9-19 high-pressure centrifugal fan. In such cases, it is necessary to address the accumulation of dust over time and remove it. The specific method is as follows. After temporarily shutting down the unit, open the access door of the casing and remove the dust from the impeller. However, this method is not entirely safe, so please exercise caution during operation. In addition to the reasons mentioned above, another factor to consider is vibration in the 9-19 high-pressure centrifugal fan caused by blade wear whilst the furnace is in operation. This issue primarily occurs when dynamic balancing is performed after shutdown. In such cases, as handholes can be installed at radial positions on the casing interfaces opposite the impeller, staff can directly access and address the issue manually. The above outlines the causes of vibration in the 9-19 high-pressure centrifugal fan and simple methods for addressing them. Should such issues arise during operation, it is recommended to follow the advice provided to restore the 9-19 high-pressure centrifugal fan to normal working order.