When using the bag filter, please pay attention to prevent the gas from cooling below the dew point in the bag room, especially when using the bag filter under negative pressure. Because the outer shell often leaks air, making the gas temperature of the bag room lower than the dew point, the cloth bag will be damp, so that the dust is not loosely but sticky to the bag, blocking the air hole of the bag, breathability Reduced, resulting in difficulty in cleaning, failure, the pressure drop of the dust collector is too large, can not continue to run, and will also produce paste bags unable to collect dust.
The reasons for condensation are summarized below:
1. The moisture of the material entering the dust collector is too large, the temperature is high, and a large amount of steam is generated, which causes the dust bag cloth bag to condense. If the temperature of the clinker entering the cement mill in the steel and non-ferrous metallurgy industry is high, and the slag moisture is large, a large amount of water vapor is generated after the two are mixed into the dust collector, and the ventilation holes around the bag are all sticky. Greatly reduced.
2. The heat preservation effect of the dust collector shell is not good, and there are holes and air leakage. Once outside air enters the precipitator, the temperature inside the precipitator will change, resulting in temperature exchange. The leakage of cold air brings the flue gas temperature closer to the dew point, and the temperature is greatly reduced, causing dew condensation on the lower part of the precipitator.
3. The flue gas temperature is too low. When the temperature of the flue gas processed by the dust collector is close to or lower than the dew point temperature, condensation will also occur.
4. The cloth bag used in the dust collector does not have the characteristics of waterproof and anti-condensation. Due to the large moisture content of the finished powder grinding section, the equipment and pipelines are easily blocked. The dust bag is very easy to condense and paste the bag, resulting in poor dust collection effect.