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Reasons and treatment methods for wear of different parts of dust removal cloth bag

2022-08-16 Page view : 8 views

Dust removal bag mouth is worn
The wear of the cloth bag mouth is mostly within 400mm downward from the bag mouth, and the damage form is mostly from the inside to the outside. This kind of wear is caused by the compressed air for back blowing and cleaning against the center of the filter bag and directly scouring the side wall of the filter bag. Under the constant scouring of the compressed air on one side, the surface layer inside the filter bag is blown off by the compressed air, then the base cloth is blown out, and finally the filter surface is blown out to form a hole. When one side of the filter bag is damaged, the resistance at the damaged part will drop, and the dust containing flue gas will quickly enter from the damaged part and scour the diagonal of the damaged part, forming a new damaged void and a new dust containing flue gas inlet. The increasing void will eventually form a ring-shaped damage at the bag mouth, and even lead to the separation of the bag head and the bag body in severe times. The causes of such damage are mainly caused by the high pressure of compressed air, the inclination of the injection short pipe and the deformation of the flower plate. Once this type of wear is found, the above problems should be corrected before replacing the new cloth bag.

Wear of filter bag body
The wear of the bag body of the dust removal cloth bag can be divided into several situations, such as vertical strip wear marks in the middle of the filter bag:

If the damage trace is from the inside to the outside, and the damage is at the touch of the vertical bar of the bag cage, it is explained that the vertical bar of the bag cage is desoldered or rusted, and the filter bag is broken, or the injection pressure is too high, and the injection is too frequent, so that the filter bag and the bag cage are folded and broken at the touch direction to form a damage. Such wear problems can be solved by replacing the bag cage or adjusting the blowing equipment.

If the damage trace is from outside to inside, the damage is at the touch of the vertical bar of the bag cage. It can often be seen that the outside of the filter bag (adjacent filter bags or box members) has traces of rubbing with the filter bag. This kind of wear is caused by the deformation of the bag cage or the small installation of the filter bag, the large or loose diameter of the filter bag, which causes the contact between the filter bag and the filter bag, the filter bag and the dust collector box member, and the mutual friction caused by the expansion of the filter bag during the back blowing process. Generally, the bag cage shall be replaced and the installation quality shall be ensured. During the design of bag type dust collector, the spacing between filter bags and the box structure shall be prevented from being too small.

The inner side of the dust removal bag is worn
The inner side of the filter bag is mostly damaged because the difference between the outer diameter of the bag cage and the inner diameter of the filter bag is too large, which constitutes the excessive swing and fluctuation of the filter bag during ash cleaning and filtration switching, and the friction between the inner side of the filter bag and the bag cage constitutes the wear of the inner side of the filter bag.

The damaged position of the inner side of the filter bag is at the bag cage. There are rust marks at the worn place. Most of them are the oxidation layer with edges and corners formed on the surface of the bag cage after corrosion. The appearance of the bag cage at this moment is like sandpaper. Every time the dust is removed, the filter bag will be severely abraded, and Zui will eventually wear the filter bag. The use of a high-quality bag cage matched with the filter bag can prevent wear on the inside of the filter bag.

The lower part of the dust removal bag is worn
Mechanical wear of the lower part of the filter bag: the wear of the outer side of the lower part of the filter bag is mostly seen within 300mm upward from the bottom of the filter bag, and the wear is mostly on one side. The lower part of the filter bag is severe, and gradually reduces upward. Part of the sewing thread will be broken, and the strength of the sewing thread in the direction without abrasion is good. This kind of wear is mainly caused by deformation of flower plate, too small hole spacing, deformation of bag cage, and too long filter bag. A single filter bag and the wall of the dust collector are damaged by friction. For such damage, the levelness of the flower board shall be strictly checked, and well-made bags and cages shall be used.
The above is the filter bag treatment methods. We have many kinds of filter bags, such as fiberglass fiber filter bags and FMS filter bags. If you need, please contact the filter bag manufacturer.