Centrifugal fan is a kind of machinery that converts mechanical energy into high pressure wind energy. It uses a high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction, so that the mechanical energy is converted into wind energy. We all know that the centrifugal fan is composed of the casing, spindle, impeller, bearing drive mechanism and motor. Centrifugal fan due to long working hours and wear and tear of its bearings will be more or less failure, then the following for you to analyze the centrifugal fan bearing vibration exceed the standard reasons. Centrifugal fan bearing vibration is a common fault in the operation of the centrifugal fan vibration will cause bearing and blade damage, bolt loosening, housing and duct damage and other failures, seriously endangering the safe operation of the centrifugal fan. Centrifugal fan bearing vibration exceeds the standard for more reasons, such as analysis of the reasons for different phenomena to take the appropriate treatment, often with half the effort Not stop furnace processing blade non-working area ash caused by centrifugal fan vibration this type of defect is common in the boiler centrifugal fan, the phenomenon is mainly manifested in the operation of the centrifugal fan vibration suddenly rise. This is because when the gas into the impeller, and the rotating blade working surface there is a certain angle, according to the principle of fluid mechanics, the gas in the blade of the non-working surface must have vortex generated, so the gas in the ash particles due to the vortex effect will slowly deposited in the non-working surface. The blade of the wing type is most likely to accumulate ash. When the accumulated ash reaches a certain weight due to the impeller rotating centrifugal force will be part of the large pieces of ash thrown out of the impeller. As each blade on the accumulation of ash can not be completely uniform consistent, gathered or can throw away the ash block time is not necessarily synchronized, the result because the blade of the accumulation of ash unevenly lead to unbalanced impeller mass distribution, so that the centrifugal fan vibration increases. In this case, usually only need to blade on the accumulation of ash eradication, impeller and will regain balance, thus reducing the vibration of the centrifugal fan. In practice, the usual method of handling is to open the manhole door of the centrifugal fan casing after a temporary furnace stop, and the maintenance personnel enter the casing to remove the ash on the impeller. This is not only a harsh environment with unsafe factors, but also causes unscheduled shutdown of the unit, long maintenance time and high labor intensity. After the study, a treatment method was proposed which was proved to be effective in practice. A row of nozzles (4-5 nozzles) was added at the throat of the casing, and the nozzles were adjusted to different angles. The nozzles are connected to the ash pump, and the ash water is used as a power medium to flush the accumulated ash. After reducing the load and stopping the single-side centrifugal fan, the valve is quickly opened at the moment of stopping the centrifugal fan, and the inertia of the impeller is used to spray and wash the non-working surface of the blades, and the ash water is discharged by opening the valve installed at the bottom of the casing. This will achieve the purpose of not stopping the furnace and dealing with the vibration of the centrifugal fan. With ash water for ash cleaning medium, and with steam and compressed air compared, with the nozzle structure requirements of low, ash cleaning range, good effect, the blade wear small and other advantages. To sum up, the centrifugal fan bearing vibration is still quite harmful, so we usually pay attention to check whether the centrifugal fan impeller above the use of ash, if there is a need to immediately remove, to avoid causing bearing vibration exceeds the standard, thus damaging the whole centrifugal fan.  

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