The reason for the damage of the dust filter bag

The main reasons are wear, burn and corrosion.

The wear of the filter bag refers to the local wear caused by the repeated filtration and backflushing state switching, the bulging and shrinking of the cloth bag, the friction between the cloth bag and the dust removal skeleton or other components, or the scouring of the high-speed airflow during the use of the dust bag.

The burning of the dust filter bag is caused by the abnormally high temperature of the flue gas being processed, which is higher than the tolerance temperature of the filter material, so that the filter material in the high temperature part is damaged.

Filter bag corrosion is a chemical reaction of the filter material caused by harmful components in the flue gas, which can be divided into gas corrosion and liquid corrosion. Harmful gas components are more likely to cause damage to the filter bag in the presence of liquid.

The material, sewing, use and maintenance of the dust filter bag are related to the efficient and stable operation of the entire dust removal system.

Factors such as air volume, dust concentration, load balance, flue gas temperature and humidity, and corrosiveness of the dust removal system may cause damage to the dust removal bag. Abrasion is the most common type of dust bag damage.

There are four types of wear of the dust filter bag:
the mouth of the filter bag,
the body of the filter bag,
the lower part of the filter bag,
the bottom of the filter bag.

The wear of the mouth of the cloth bag is mostly within 400mm downward of the mouth of the bag, and the damage marks are mostly from the inside to the outside. This type of wear is mainly caused by the pulsed compressed air deviating from the center of the filter bag and directly scouring the side wall of the filter bag. This kind of damage is mainly caused by high compressed air pressure, skewed blowing pipe, or deformation of the flower plate. Once such wear is found, the blowing mechanism should be checked before replacing the new cloth bag.

Filter bag body borken

The wear of the bag body of the dust filter bag, if the damage is at the vertical ribs of the skeleton, it means that the vertical ribs of the bag cage cause the filter bag to be folded and broken, causing damage. Such wear can be resolved by replacing the bag cage or adjusting the blowing unit.

The lower part of the dust bag is worn

The outer wear of the lower part of the filter bag is more common within 300mm upwards from the bottom of the filter bag, and the wear is mostly on one side, the lower part is the most serious, and gradually decreases upwards. The local sewing thread will be worn off, and the sewing thread strength is good in the position that is not worn. This kind of wear is mostly caused by the deformation of the flower plate, the too small hole spacing, the deformation of the bag cage, and the long filter bag. Individual filter bags and dust collector box walls are damaged due to friction. Such damage requires strict inspection of the levelness of the decking and the use of well-made cages.

The lower part of the filter bag broken, generally within 300mm upwards from the bottom of the filter bag. The local sewing thread will be worn off, and the sewing thread strength is good in the position that is not worn. This is due to the deformation of the perforated plate, the spacing of the holes is too small, and the deformation of the skeleton. Such damage requires a strict inspection of the levelness of the decking, and a well-made skeleton should be used.

The annular wear on the lower part of the filter bag is generally caused by the scouring of the filter bag by the dust-laden flue gas, indicating that the local airflow speed of the filter bag is fast. When one side of the filter bag is damaged, the smoke scours the damaged diagonal corner, causing the ring-shaped rupture of the filter bag.

The contact position between the lower part of the filter bag and the skeleton broken: because the diameter of the bottom cover of the skeleton and the skeleton is too different, the change range of the filter bag during cleaning and filtration is too large, and the skeleton is damaged by friction. Need to replace high-quality frame.

Wear on the outside of the bottom of the filter bag: There are obvious signs of wear on the damaged surface. The bottom sewing thread and filter material base cloth are worn off, and in severe cases, the bottom of the bag is damaged or falls off as a whole. This kind of wear is due to the high material level in the ash hopper, and the dust particles raised by the airflow directly wash the bottom of the bag, causing wear and tear. By increasing the amount of ash unloading in the ash hopper and adjusting the ash hopper unloading work system of the dust collector, it is possible to avoid excessive dust accumulation and avoid the formation of eddy current wear filter bags in the ash hopper.

The wear on the inner side of the bottom of the filter bag is more common when the bottom of the bag cage is too small or the filter bag is too long, and the bag cage can only be used to support part of the bottom of the bag. When the filter bag is switched between cleaning and filtration, the bottom of the filter bag is shaken, which causes the inner side of the filter bag to be worn.