As a centrifugal fan used in desulfurization system, its shell should be welded steel plate, material is ordinary steel plate, the lowest part of the casing should be installed with a drainage pipe at least 20 mm in diameter, a ball valve on the pipe, and a nut at the end of the ball valve. The material of impeller blade should be 16Mn high quality structural steel, the material of wheel shell can be cast iron, its operation should be stable and reliable, and its service life can reach 8000 hours.
The transmission mode of the centrifugal fan is designed as coupling transmission, which is equipped with flexible coupling. The protection device should meet the corresponding standards. The critical speed of the spindle should be 1.3 times of the maximum working speed of the fan. And with high temperature bearing, bearing box should be cast iron, bearing oil lubrication, bearing and sealing system should have reliable cooling system.
In addition, there are centrifugal fan throttle door, flange, lifting bolt and base and other parts of the design, but also to meet the requirements. For example, the throttle can be adjusted in the range of 0-90 degrees to meet the actual needs. Flanges, bolts, nuts and gaskets should be matched with the fan, and the base should have sufficient stiffness and strength.