Due to the advantages of high efficiency filter: small volume, simple operation, energy saving, high efficiency, bag filter widely used in various industries, but the use of the process will be blocked, what is the cause of this?
Moisture is the main cause of high efficiency filter bag clogging. Water is usually produced by condensation at low temperatures, especially when dealing with high-temperature flue gas. In this case, the following measures can be used to prevent: avoid incorrect startup; Avoid opening the dust collector when it has high resistance; Start below the dew point. Dust collectors operate below the dew point, which can be problematic. If the air intake distribution is not uniform, it is likely to lead to local corrosion of the dust collector housing. Therefore, the dust collector should be prevented from working below the dew point. If starting at low temperatures is unavoidable, use insulation devices such as steam insulation or electrical heating.
If the high efficiency filter is often cleaned or cleaned for too long, resulting in too much pressure of the device, the fiber structure of the filter bag is easy to loose, and the fine dust in the flue gas is easy 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 be washed away, resulting in a decrease in the filtration accuracy of the filter bag. The cleaning time is too short, the dust on the filter bag surface is not completely removed, and then filtration begins. Dust gradually accumulates on the surface of the filter bag, which also leads to the blockage of the filter bag.
Air penetration has been reported to occur frequently in the flanges of dust collectors, access doors, or mobile devices of dust collectors. If the seal is not tight, external air may enter the dust collector. When high temperature flue gas is treated, a low temperature zone is created inside the dust collector. It can condense at low temperatures, corrode the dust collector, and lead to filter bags or bag knots.
If the design standard of the ultrafiltration bag operated by the dust collector also allows the fine dust from the flue gas to enter into the fiber of the hepa filter bag, the anti-blocking performance of the filter bag will increase.
