During the operation of the bag filter, if the emissions exceed the standard and the operating pressure of the bag filter is too low compared to the design, it is highly likely that the initial powder layer on the surface of the dust removal bag is insufficient. The reasons may be that the filtering speed of the filter bag is too high, the cleaning cycle of the filter bag is too short, the pressure of compressed air injection is too high, and the load capacity of the dust is reduced.
Research has shown that excessive filtration speed increases the dust discharge rate, while excessive filtration gas speed can cause the initial dust layer to break and the dust to impact the filter bag, causing excessive wear. If the number of times the filter bag is cleaned at this time is too high, it is easy to cause the fabric of the filter bag to loosen, which can lead to excessive emissions from the dust collector. High temperature resistant needle felt
When setting the pulse cleaning cycle of the dust collector, it is best to ensure that the dust collector operates under stable pressure and the set pulse cleaning cycle time is long. The pulse cleaning time should ensure that the initial dust does not fall off, and the set cleaning time should be short. If the initial dust layer is insufficient, an extended cleaning cycle can be used as a reward. If pressure difference control is used, the stability of the inlet and outlet pressure setting of the dust collector can be improved.
If the excessive discharge of the dust collector only occurs after cleaning the filter bag, it is only necessary to check whether the pressure of the compressed air used for pulse cleaning is too high. The decrease in dust load may be caused by a decrease in productivity, or by maintenance and adjustment of the control system of the dust collector. The solution can be to gradually increase the load with a light load or to use pre coated dust.
