Reasons for bag filter bag clogging and how to deal with it

(1) The main reasons for the clogging of the filter bag are excessive filtration speed, too fine dust, sticky dust, poor dust cleaning of the filter bag, bag paste, condensation, and hardening of the filter bag. If the filtration wind speed of the dust collector exceeds the design standard of the filter bag, it will easily cause the fine dust in the flue gas to enter the fiber of the filter bag, causing the filter bag to become blocked and the resistance will increase. It is a better method to use film-coated filter material, coated filter material or pre-coating the surface of the filter bag with dust. For dust with high viscosity, it is necessary to reduce the filtration wind speed, or increase the pressure of pulse injection, or use offline pulse cleaning of filter bags. However, the better method is to increase the filtration area, reduce the filtration wind speed, and extend the life of the filter bag. service life.
(2) The main reasons for poor dust cleaning of filter bags include frequent cleaning times and too long cleaning time. Excessive cleaning times and excessive cleaning pressure can easily cause the fiber tissue of the filter bag to loosen, thereby increasing the fine dust in the flue gas and clogging the filter bag. If the dust cleaning time is too long, the initial powder layer on the surface of the filter bag will be cleaned away, causing the filtration accuracy of the filter bag to decrease. If the cleaning time is too short, the dust on the surface of the filter bag has not been completely cleaned, and then filtration begins, and the dust gradually accumulates on the surface of the filter bag, causing the filter bag to become clogged. To solve this problem, you can pass it several times Adjust the injection controller after the test run.
(3) Moisture is the biggest cause of clogging of filter bags. The reason for moisture is usually condensation at low temperatures, especially when dealing with high-temperature flue gas. The following methods can be used to prevent this situation: avoid improper startup; avoid Start when the dust collector resistance is high; start when the dust collector is below the dew point. If the dust collector operates below the dew point, problems are likely to occur. If the air intake is unevenly distributed, it may easily cause local corrosion of the dust collector shell. Therefore, the dust collector should be avoided operating below the dew point. If it is unavoidable to start the machine at low temperature, thermal insulation devices should be used, such as steam insulation or electric heating insulation.
(4) Air infiltration. Air infiltration often occurs in the flange, access door or movable device of the dust collector. If the seal is not tight, external air enters the dust collector. When high-temperature flue gas is processed, a low temperature zone will be generated inside the dust collector, resulting in low temperature. Condensation everywhere will corrode the dust collector and cause the filter bag to become sticky or hardened.