Although there are many factors that cause the bag filter to corrode, the most direct cause is that the temperature of the gas will approach the dew point, and it may be below the dew point, causing condensation of the gas and condensation on the metal surface. Therefore, in order to prevent the bag filter from being corroded, the most direct and effective measure is to improve the process system and operation method to avoid condensation.
Reducing the moisture content of the gas reduces the dew point temperature of the gas, and also increases the temperature of the gas as much as possible to increase the temperature difference between the gas temperature and the dew point temperature. Practice has also proved that this experience value is too small, because many working conditions are difficult to predict, if the air leakage rate is relatively large, the gas temperature is preferably higher than the dew point temperature by more than 30 degrees.
This method mainly involves the sealing of the baghouse itself and other equipment and piping in the baghouse system. Because the density of the baghouse itself depends on the casing, in order to maintain a good seal of the casing, it is necessary to first ensure the quality of the manufacture and installation of the baghouse, and all the joints of the casing are preferably used. For continuous welding, the seal around the door should also be made of heat-resistant silicone rubber.