How to avoid corrosion of the flue gas induced draft fan by low-temperature flue gas?
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The image below shows the flue gas exhaust fan of the heating furnace; this fan is subject to corrosion caused by low-temperature flue gas, which reduces its service life. What methods can be used to solve this problem?
Thank you to the original poster for their generous sharing
Generally, there are three ways to avoid this: 1. Remove the components in the flue gas that tend to condense and crystallize, thereby producing clean flue gas that does not form scale； 2. Modify the surface of the fan that is in contact with smoke, so that the accumulated scale cannot adhere to it and falls off automatically or on a scheduled basis. For example, a surface with a specific microstructure can be used to cause the scale to fall off automatically when temperatures change ； 3 Modify the flow channels and flow field to prevent the sooty flue gas from coming into contact with the surface of the fan, for example by using injectors to create a suction effect. Furthermore, if the crystallization temperature is not high, the part of the fan that comes into contact with the flue gas is heated to above the crystallization temperature ； It is not suitable when the temperature exceeds the fan’s design temperature.
Impellers made of stainless steel are used; the impellers should be disassembled regularly, and a sandblaster proves to be effective for cleaning them. Additionally, preliminary purification of the flue gas is necessary; it is advisable to inspect or install a flue gas purification system before the fans to ensure their service life. For reference.