Which parts of the dust filter bag will be worn
Publish Time: 2021-09-14 Origin: Site
Uneven airflow distribution, high flue gas filtering speed, too small spacing between dust removal filter bags, and wear or shedding of the film on the surface of the dust removal filter bag are the main reasons for the damage of the dust removal filter bag. Back blow cleaning and so on are closely related. The wear conditions and factors of different parts are different, so which parts of the dust filter bag will generally be worn?
2. Dust removal filter bag mouth
Abrasion generally occurs within 400mm of the mouth of the dust removal filter bag, and most of the traces of abrasion are from the inside to the outside. The main reason is that the compressed air blown back by the pulse deviates from the center of the dust filter bag and directly flushes the side wall of the dust filter bag. Under the continuous scouring of the deviated compressed air, the inner side layer of the dust filter bag is first blown off by the compressed air, and then the base The cloth is leaked and the filter surface is also leaked. When one side of the dust filter bag is damaged, the resistance of the damaged part will decrease, and the dusty smoke will quickly enter from the damaged part, scouring the damaged part diagonally, forming new cavities and new dusty flue gas intrusion, which is caused by the increasing number of cavities. The bag mouth of the dust removal filter bag is damaged in a ring shape, and in severe cases, the bag head of the dust removal filter bag and the dust removal filter bag body are separated. This type of damage is mainly caused by the high pressure of the compressed air, the skewed injection tube, and the deformation of the flower plate. When it is found that the mouth of the dust removal filter bag is worn, it should be blown back.
3. Dust removal filter bag body
There are two situations in this category:
1. If the traces of damage are from the inside to the outside, it means that the vertical ribs of the bag cage are unwelded or rusted, the dust filter bag filter bag is worn off or the injection pressure is too high, and the ejection is too frequent, making the dust filter bag filter bag and the bag cage Folding and breaking at the contact position causes damage. This kind of problem can be solved by replacing the dust filter bag cage or adjusting the spray device.
2. If the traces of damage are from the outside to the inside, there are traces of friction between the outside of the dust filter bag, the box structure or the adjacent dust filter bag. This kind of wear is caused by deformation of the dust filter bag cage or the installation of the filter bag is too small, the dust filter bag diameter is too large or loose, causing the dust filter bag and the dust filter bag, the dust filter bag and the dust collector box structure to contact, in the reaction During the blowing process, due to the friction of the expansion of the dust removal filter bag, it is generally necessary to replace the bag cage and ensure the installation quality.
4, the inside of the dust filter bag
Mostly, the difference between the outer diameter of the bag cage and the inner diameter of the dust removal filter bag is too large, causing the dust removal filter bag to swing too much when cleaning and filtering, and the inside of the dust removal filter bag rubs against the bag cage.
5, the bottom of the dust filter bag
There are obvious signs of wear at the bottom, the sewing thread and the filter material base cloth are worn off, or even damaged or fall off as a whole. This kind of abrasion is caused by the high material level in the ash hopper, and the airflow raises dust particles to directly wash the bottom of the bag, causing abrasion. By increasing the ash hopper unloading volume and adjusting the dust hopper ash unloading work system of the dust collector, excessive dust accumulation is avoided. To solve this problem.
6, the lower part of the dust filter bag
There are three situations:
Mechanical wear: Wear is generally within 300mm from the bottom up, mostly on one side, with the lower part being serious and the upper part being lighter. This type is mostly caused by deformation of the flower plate, too small hole spacing, deformation of the bag cage, and too long dust filter bag. When this problem is found, the level of the flower plate should be strictly checked and a good bag cage should be used.
Annular wear: an annular wear cavity is formed from the outside to the inside. This is caused by the local airflow velocity of the dust removal filter bag being too fast, so that the dust-containing flue gas will locally scour the dust removal filter bag. This type of problem mostly occurs in dust collectors with higher wind speeds or more abrasive dust.
Internal abrasion: The diameter of the bottom of the bag cage and the bag cage is quite different, which causes the dust removal filter bag to change too much during cleaning and filtration, and friction and damage to the bag cage.