Disassembly and inspection diagram of flue gas recirculation fan
Thread Content
The reason for this disassembly and inspection was mainly the high temperature of the fan’s bearing housing, which posed a safety risk during long-term operation. Upon inspection, it was found that some of the steel balls inside the bearing were worn, and the oil in the bearing housing was also dirty; these were the direct causes of the high temperature encountered this time. Note: SKF-brand bearings are used on-site; although it is a well-known brand, fake versions of it are also common, so special attention is required. The image below shows the interior of the fan impeller; due to the high corrosivity of the flue gas in the flue gas recirculation pipeline, corrosion is quite evident. Over time, significant local corrosion can also lead to dynamic balance issues, which in turn result in increased vibration. New spare bearing
During the disassembly and inspection of the flue gas recirculation fan, it was found that excessive temperature was caused by worn bearing balls and dirty bearing housings. Be aware that SKF bearings used on site carry a risk of being counterfeit. .
The structure is exactly the same as that of my boiler fan. For equipment such as fans, lubrication and tightening are fundamental, and routine inspections should be combined with scheduled maintenance. I’ve encountered extremely fake SKF bearings on gas pressure pumps; they cost over 300 each, and they started smoking just two days after being installed. Luo Axle ones all cost over 800, and they can last for a long time once installed. I’m facing a troublesome issue now: three bolts of the diaphragm coupling on the exhaust fan have broken. (One tooth was removed per week for a week; operation was very stable with low vibration levels. The bolt strength should be fine; this problem won’t occur with the other furnace. ) Prepare to dump the furnace or temporarily shut down the fire for treatment. Are there any standards and materials regarding the installation of diaphragm couplings? Please share
For diaphragm couplings, it is necessary to refer to the manufacturer’s installation instructions; among domestic brands, Wuxi Chuangming is considered one of the better ones. The control data relates to the intermediate clearance reserved for the coupling, as well as the opening at the center, etc. Beyond the specified limits, it is possible for the coupling to break, but generally, the diaphragm is the first to deform or break in such cases. If the bolt breaks and the material of the coupling is fine, it is very likely a problem with the center. Attached is a drawing of the coupling for the circulation pump