The form and variety of bag filter can be divided into three types: mechanical cleaning, reverse airflow cleaning and pulse blowing, and two types of internal filtration and external filtration, which can be divided into two types according to the position of import and export.
1. The way of pulsing and blowing ash
Compressed air is ejected at high speed through the nozzle, and the surrounding air is sprayed into the filter bag in a very short time, resulting in rapid expansion and shrinkage of the filter bag.
The stripping of dust layer on one hand is the stripping force of the dust layer by the jet airflow, on the other hand, the dust is removed by the reverse acceleration formed during the retracting process of the expansion filter bag. In this way, the ash removal intensity is large, and the dust removal can be carried out under the filtration working condition, and the permitted filtering speed is also high.
Because of the many advantages of pulse jet cleaning, it has gradually become a main way of dust removal in bag filter.
Pulse blowing dust cleaning bag filter
2. Bag type dust collector
The reverse airflow ash cleaning is carried out in the form of outdoor or circulating air, which is opposite to the dust laden air flow through the filter bag, so that the dust layer falls off and falls into the ash hopper.
On the one hand, the dust layer formed by the reverse direction of the dust flow on the dust layer is directly stripped from the dust layer. On the other hand, the expansion and contraction vibration of the filter bag is produced because of the change of the direction of the air flow, and it also helps the fall of the dust.
Reverse air blowing dust cleaning bag filter
3. Mechanical cleaning
This cleaning method can include manual beating, mechanical beating, and so on. It is the simplest way to remove dust.
Generally speaking, the vibration distribution of the filter bag in the mechanical vibration is not uniform along the axial direction, and the acceleration attenuation is faster, the length of the filter bag is generally short, and the filtering wind speed is small. The mechanical vibration cleaning bag type dust remover adopts mechanical movement device to make the filter bag vibrate periodically, so that the dust particles adhering to the filter bag fall into the ash hopper.
Mechanical dust cleaning bag type dust collector
According to different vibration modes, they can be divided into three forms: horizontal vibration, vertical vibration and torsional vibration, as shown in the following figure.
Three modes of vibration
(a) for horizontal vibration, there are two kinds of vibration: top and middle.
(b) for vertical vibration, it uses the eccentric wheel device to vibrate the filter bag frame or periodically lift the filter bag frame for dust removal.
(c) for torsional vibration, it uses mechanical transmission device to periodically filter the bag at a certain angle to make the dust fall off.