Nowadays,bag filter it is more and more common in our daily life, but we often encounter blockage during use. The following are several common reasons that cause bag filter blockage

1. Air infiltration

   It is reported that air infiltration often occurs in the flange of the dust collector, the inspection door or the movable device of the dust collector. If the seal is not tight, the outside air enters the dust collector. When high temperature flue gas is processed, a low temperature area will be generated inside the dust collector. It may cause condensation at low temperature, corrode the dust collector, and cause paste or compaction of the filter bag.

2. The filter wind speed is too high

   It is understood that if the filter wind speed of the dust collector exceeds the design standard of the filter bag, it will also cause the fine dust in the flue gas to enter the inside of the filter bag fiber, and the clogging resistance of the filter bag will increase. In view of this situation, the coated filter material, coated filter material or pre-coating treatment can be used on the surface of the filter bag. For dust with high viscosity, it is necessary to reduce the filtering wind speed, or increase the pressure of pulse blowing, or adopt the method of offline pulse cleaning filter bag. According to the industry, a better way is to increase the filtration area, reduce the filtration wind speed, and extend the service life of the filter bag.

   

3. Poor cleaning of filter bag

   It is understood that if the bag filter is cleaned frequently, or the cleaning time is too long, resulting in excessive pressure on the equipment, it is easy to loosen the fiber structure of the filter bag and increase the fine dust in the flue gas to block the filter bag. In addition, if the cleaning time is too long, the initial powder layer on the surface of the filter bag will also be washed away, resulting in a decrease in the filtering accuracy of the filter bag. However, the dust removal time is too short, and the dust on the surface of the filter bag is not completely cleaned, and then the filter starts. The dust gradually accumulates on the surface of the filter bag, which will also cause the filter bag to block.

4. Contains water

   Moisture is the main cause of clogging of the filter bag. The cause of moisture content is usually condensation at low temperature, especially when dealing with high-temperature flue gas. In this case, the following methods can be used to prevent: avoid improper starting; avoid starting when the dust collector resistance is large; starting below the dew point. The dust collector runs below the dew point, which is prone to problems. If the air intake is unevenly distributed, it is easy to cause local corrosion of the dust collector shell. Therefore, the dust collector should be avoided from working below the dew point. If it is unavoidable to start at low temperature, use insulation devices, such as steam insulation or electric heating insulation.