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Prevention And Treatment Of Dust-removing Bag Wear
Mar 12, 2018

Wear of bag mouth in dust-removing bag

The wear of the bag mouth is mostly within 400 mm below the bag mouth, and the damage marks are mostly from the inside out. The main reason for this kind of wear is that the compressed air of pulse backblowing deviates from the center of the filter bag at the beginning of this kind of wear. The inner side layer of the filter bag is blown off by compressed air first, then the base cloth is blown out, and finally the filter surface is also blown out. When the side of the filter bag is damaged, the inside side layer of the filter bag is blown off, and the filter surface is also blown out. When the side of the filter bag is damaged, the inside side layer of the filter bag is blown off. When the resistance at the breakage decreases, the soot gas enters quickly from the breakage, scouring the damaged area diagonally, forming new voids and new entrances of dust-containing smoke, and increasing voids, which eventually result in annular breakage at the mouth of the bag. Such breakage is mainly caused by high pressure of compressed air, skew of short pipe, deformation of floral plate, and so on. Once such wear is found, it should be sprayed back before changing into a new cloth bag.

Bag body wear

Apart from the wear of the dust-cloth bag, the common vertical stripe in the middle of the filter bag can be divided into several situations:

If the damage marks are from inside to out and the breakage is at the contact of the vertical reinforcement of the bag cage, it is indicated that the vertical reinforcement of the bag cage is diswelded or corroded, the filter bag is grinded or the pressure of jet blowing is too high, and the injection is too frequent. The collapse of the contact position between the filter bag and the bag cage leads to breakage. The wear problem can be solved by replacing the bag cage or adjusting the injection device.

If the damage marks are from the outside to the inside, the breakage is in the contact of the vertical reinforcement of the bag cage. It is often observed that the outside of the filter bag (adjacent filter bag or box member) has a trace of rubbing with the filter bag. Such wear is caused by the deformation of the bag cage or the small installation of the filter bag. The larger or looser diameter of the filter bag causes contact between the filter bag and the filter bag, between the filter bag and the filter box member, and during the backblowing process, the bag is worn by friction due to the expansion of the filter bag. It is generally necessary to replace the bag cage. In the design process of bag dust collector, the distance between filter bag and box structure should be avoided.

Wear of filter bag

The wear of the dust bag bag body, the vertical bar wear mark in the middle of the filter bag, is divided into several kinds of cases.

Lower wear of dusting bag

Bag: bag outside of the lower part of the lower mechanical abrasion wear in the bag bottom up within 300mm, the wear on the side, is the most serious, to gradually reduce. Local sewing thread may be worn off, no wear position of sewing thread. Such strong good abrasion due to plate deformation, hole spacing is too small. The deformation caused by the filter bag cage, long and other reasons. Individual bag dust collector and tank wall friction damage. Such damage should be strictly check the flower board level, and should make use of sophisticated bag cage.

In the lower part of the annular wear bag bag is formed by the outer and inner ring wear holes. This kind of wear is due to dust on local scour caused by the bag, bag that local air speed is too large. In higher filtration rate dust remover or abrasive dust strong, when the bag side damage after the dust erosion damaged diagonal, with the passage of time the damage continues to expand, can lead to serious breakage of bag filter bag ring fracture.

The inner side of the filter bag is worn out: it is mostly seen in the contact position with the bag cage. Most of the difference between the diameter of the bottom of the bag cage and the bag cage is too large, resulting in too much change in the filter bag cleaning and filtration, and the friction between the bag and the cage. The replacement of the high quality bag cage can solve the problem.


The dust bag is the heart of the whole dust collector, and the failure of the filter bag will make the whole equipment unable to operate normally. The wear of the filter bag is mainly related to the design, application, manufacture and installation quality of the dust collector. However, as long as a small wear hole is formed, it will spread quickly and cause more damage to the filter bag. Therefore, strengthening the inspection, detection and early detection of small wear during operation are also important factors to avoid large-scale filter bag wear.





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