1, centrifugal fan design reason: the design parameters of centrifugal fan are small, and the actual operation parameters are much larger than those of centrifugal fan, which makes the centrifugal fan unable to meet the load of the unit.
2. Reason for selection of centrifugal fan: When the output of centrifugal fan is insufficient, the problem of selection will always come to mind first, such as the large deviation between the operating point and the design point and the low efficiency of centrifugal fan.
3. The manufacturing reason of centrifugal fan: The profile of blades, especially the profile of wing blades, has a great influence on the output and efficiency of centrifugal fan. Improper manufacturing or operational wear will damage the blade profile to varying degrees, resulting in a decline in output and efficiency.
? 4. Installation reason of centrifugal fan: The reverse installation of regulating door and excessive clearance will greatly reduce the performance of centrifugal fan, such as the radial clearance between collector and impeller of centrifugal fan.
5. System reason: Unreasonable pipeline layout of the system directly affects the performance of the centrifugal fan. At the same time, because the centrifugal fan is a part of the system, the direct interaction between the centrifugal fan and the system may make the centrifugal fan run far away from its designed and specified working conditions, and the normal operation of other equipment in the system will also affect the performance of the centrifugal fan, such as air leakage blockage of the air preheater, heater blockage, dust accumulation in the flue, GGH blockage of the desulfurization system, demister blockage and other common problems will cause insufficient output of the centrifugal fan.
6. Operation reason: The combustion coal quality is quite different from the design coal quality. Incorrect indication of the opening of the control valve of centrifugal fan will also lead to insufficient output, which is an illusion and can be solved after calibrating the opening of the control valve.