The dust removal method of the bag filter is the primary condition for selecting the type of dust bag (filter bag). It can first determine whether the dust bag (filter material) is a woven fabric, needle felt, compressed felt, or dust bag (glass fiber filter bag). As for the detailed specifications of the dust bag (filter bag), further consideration can be given based on other filter conditions.
1, vibration cleaning
This cleaning method is characterized in that the kinetic energy applied to the dust layer is smaller than that of the pulse blowing and back blowing, and is a low energy type of cleaning. Therefore, it is preferable to use a fabric dust filter bag. The soft vibration of the woven cloth is better
2, back hair (anti-sucking shrink bag) cleaning
This type of cleaning method generally employs a fabric dust removal bag (filter bag), but it is also possible to use a felt material having a lighter weight (300 to 400 g/m2), rich flexibility, and small dimensional change. Among them, the use of glass fiber dust bag (filter bag) is the most, and it is mostly used for large bag filter. Dust filter bag lifting, sewing, etc. have certain requirements, if not pay attention to the dust filter bag has a greater impact on the service life.
3, pulse jet cleaning
This cleaning method applies the highest cleaning kinetic energy to the dust layer and is a typical way of external cleaning. The fine ash power is very strong, and the residual amount of dust attached inside the dust bag (filter bag) yarn is relatively small, and the dust bag (filter bag) used is generally a felt or a needle felt. The dust filter bag under the pulse jet action is very deformed instantaneously, resulting in great stress, so it is necessary to use strong filter media. The dust bag (filter bag) often rubs against the skeleton, so wear-resistant dust filter bags are used, and fabric dust bags (filter bags) can also be used.
4, gas ring cleaning cleaning
Due to the relatively good dust removal performance, the dust bag (filter bag) is required to have good rigidity, fine pores, and good wear resistance. In this way, the dust bag (filter bag) does not change when the air ring is reciprocated up and down. Change, no lint. So limit the use of felt or needle felt. And thick, high density felts are required. Cloth weight should generally be 600 ~ 800g/m2 is appropriate.
5, pulsating reverse blowing cleaning
The kinetic energy of dust applied by this method is in the middle of high energy type and low kinetic energy type. This kind of dust removal requires that the dust bag (filter material) has flexibility and also requires certain rigidity. When fabric dust filter bags are used, satin and twill fabrics are suitable. However, from the aspects of dust removal efficiency, filtration speed, and anti-wear strength of the frame, it is appropriate to use needle felts. The best choice is 300 600g/m2 needle felt. Very few woven fabrics are used, and if necessary, various surface treatments should be performed.
6, back hair – vibration cleaning
The cleaning energy applied to the dust layer by the cleaning dust is of low energy type. The initial use of fabric dust bag (filter bag) is mostly. At present, most needle felts are used mainly for the purpose of improving the filtration speed. The needle felts require a cloth weight of 280-350 g/m2 and a thickness of 1.0-1.3 mm, and the air permeability is better. In the sewing and installation of the dust filter bag, we usually tighten the dust filter bag and prevent the middle size of the filter from stretching. When the dust filter bag reaches about 2% elongation, the dust removal effect deteriorates, so the dust is removed. In the shaping process of the bag (filter bag), we will consider the technical conditions for preventing the filter bag from elongating.