Axial Fan Wind turbines are widely used in many industrial production and are important auxiliary machinery in industrial production. The axial-flow fan is widely used because of its high energy utilization. But in recent years, because of the production accidents caused by axial-flow fan, especially the axial-flow fan of power plant, which often fails, although it seldom causes casualties, Axial Fan it has caused great economic loss for the power plant shutdown and the damage of the turbine equipment. Therefore, it is very important to enhance the reliability of axial-flow fan and improve the working efficiency of axial-flow fans under such circumstances.
Before the 90 's, the unplanned downtime and unplanned load reduction caused by boiler fans in large power stations (125MW and above) in China were more frequent, according to statistics, in 125MW, 200MW, 300MW and 600MW units, according to the equivalent outage hours of power plant calculation,Axial Fan sending, induced fans are ranked in the first 10 factors of influence, and the gap between the developed countries is larger. After the 90 's, several main power plant wind turbine factory equipment quality improved rapidly, in view of the actual situation of China's power plant, the introduction of foreign advanced technology,Axial Fan so that power station fans, especially the dynamic vane adjustable axial fan reliability has been continuously improved.
The accident of axial-flow fan is divided into 3 kinds of accidents according to the influence degree, the first kind of accident is the most serious. The third kind of accident represents the safety hidden trouble of axial-flow fan. The specific classification is as follows: The first kind, the fan serious breakdown, causes the entire thermal power unit not to operate normally. Seriously affect the production work; Axial Fan the second kind, the efficiency of axial-flow fan is reduced, but it does not cause the thermal power unit to stop running, but affects the working efficiency of the thermal power plant; The third category, the axial fan has a small fault or trouble, resulting in a slight decline in the axial fan operation efficiency, but does not affect the normal
There are many common faults in axial-flow fan, because axial fan has been in a high load working environment, so there may be many faults. Rotor fault, which is a common fault in the fan, the specific fault includes the rotor bending, operating vibration, or the emergence of rotor and impeller connection problems, resulting in rotor shaft idling, impeller and rotor slip phenomenon. Blade failure, the blade in the long time to work in a great deal of force, so easy to thick crack and fracture accident, at the same time this kind of fault is difficult to check, because the axial fan is at a high speed running state, so can not use what way can predict the fault of the impeller. Axial Fan Therefore, the impeller fracture is the most common production accident of axial flow fan? The damage of the fan bearing will cause the stator shell to cling to the dead rotor, and the stator shell has a huge impact on the fixed, resulting in the overall shedding of the axial fan. When the circuit circuit is too large, the copper wire in the line to generate heat effect will be the stator or rotor burnout, the motor caused great damage, the lack of grease caused by the fan components in the dry grinding, the final bearing, rotor and so on to death. So in the day-to-day maintenance to pay attention to increase grease.
First, the axial fan may be the first, because in the design there is a certain safety hazard, in the design of the mechanical elements are ignored, resulting in the axial flow fan unqualified, or because in the production of Jerry-building, resulting in work efficiency is not high, stability is not good. Second, Axial Fan in the design forget to consider the gas expansion coefficient, and gas use characteristics do not have a detailed understanding. Third, the blade does not carry on the daily maintenance, the enterprise production, pays attention to the production, despises the maintenance important significance. or the quality of the blades is not qualified. Four, the quality of the grease is poor, or the sublimation of the characteristics of poor, resulting in the axial flow fan after a period of operation, the quality of lubrication becomes extremely poor. The corresponding fault detection module damage, there is no way to timely reflect the normal working conditions of the fan.