Common dust bag breaks the main loss of wear, burning and corrosion.
Filter bag wear means that during the use of the dust bag, due to repeated filtration and blowback state switching, the bag bulges and shrinks, relative movement occurs between the bag and the dust removal frame or other components, and local abrasion is caused by the erosion of the high-speed dust-containing airflow.
Dust bag damage is due to the abnormal high temperature, or high temperature dust particles, the temperature is higher than the filter temperature, so that the high temperature parts of the filter caused damage to damage.
The filter bag corrosion is caused by the chemical reaction of the filter material caused by harmful components in the flue gas, resulting in a decrease in the mechanical properties of the filter material and breaking the loss effect. The corrosion of filter bags often occurs when the components of the smoke gas are out of specification, which can be divided into gas corrosion and liquid corrosion. In the presence of liquids, the hazardous gas components are more likely to cause damage to the filter bag.
Due to the presence of liquid components (such as condensation) in the flue gas, the paste forms a paste with the dust and clogs the gap in the filter bag, causing the paste bag to cause dust removal failure.
Today mainly introduces the prevention and treatment of dust bag wear
Dust bag wear is the main type of bag breakage effect. After other damage types cause damage to the small holes, the erosion of dust-containing air flow also generates further wear. Wear and bag filter structure design, air flow organization, back blowing cleaning and so on are closely related. The occurrence of dust filter bag wear is divided into the following five situations: filter bag mouth, filter bag body, filter bag, filter bag bottom and filter bag inside, different parts of the wear and the different factors, the solution Also different.
Dust bag pocket wear
The wear of the mouth of the bag pocket is mostly within 400mm of the mouth of the bag, and the signs of damage are mostly from inside to outside. The initial stage of this type of wear is mainly due to the fact that the pulsed back-flush compressed air deviates from the center of the filter bag and directly flushes the side wall of the filter bag. When the deviated compressed air continues to scouring, the inner side layer of the filter bag is first blown off by the compressed air, then the base fabric is blown off, and finally the filter surface is also blown off. When the filter bag is damaged on one side, the resistance at the damaged part will drop, and the dusty flue gas will quickly enter from the damaged part, scour the diagonally damaged part, form a new hole and a new dusty flue gas entrance, and the increasing number of holes will eventually cause the bag. The ring is broken and the head and bag body are separated even when it is serious. Such damage is mainly caused by high pressure of the compressed air, skew of the injection pipe, and deformation of the board. Once such wear is discovered, the blower should be blown before replacing the new bag.
Filter bag body wear
The wear of the dust bag body, the vertical strip wear marks in the middle of the common filter bag, is divided into several situations:
If the damage marks from the inside to the outside, damaged in the bag cage vertical bar contact, indicating that the bag cage vertical reinforcement off or corrosion, the filter bag is broken or the injection pressure is too high, the injection is too frequent, so that the filter bag and the bag cage The breakage of the contact position caused breakage. This kind of wear problem can be solved by replacing the bag cage or adjusting the blowing device.
If the damage marks from the outside to the inside, the damage is at the vertical contact of the bag cage. It is often seen that the outside of the filter bag (adjacent filter bag or box member) has scratches with the filter bag. This kind of wear is the deformation of the bag cage or the filter bag installation is too small, the filter bag diameter is large or loose, causing contact between the filter bag and filter bag, filter bag and dust collector box body components, in the back blowing process due to the filter bag The swelling rubs against each other to cause it to wear. It is generally necessary to change the bag cage and guarantee the installation quality. During the design of the bag filter, the distance between the filter bag and the distance between the filter bag and the box structure should be avoided.
Dust bag under wear
The lower part of the filter bag mechanical wear: the lower part of the filter bag outer wear more common in the bottom of the filter bag 300mm upward, wear more on one side, the lower part of the most serious, gradually reduce the upward. The local sewing thread will be worn off, and the sewing thread will have good strength at the place where it is not worn. This kind of wear is caused by the deformation of the board, the hole spacing is too small, the bag cage is deformed, the filter bag is too long and other reasons. Individual filter bags and dust collectors were damaged by friction. Damages of this type should be strictly checked on the level of flower boards, and well-made bag cages should be used.
The ring wear of the lower part of the filter bag: An annular wear hole is formed from the outside to the inside of the filter bag. This kind of abrasion is caused by the partial flushing of the filter bag by the dust-laden flue gas, which indicates that the local air velocity of the filter bag is too large. It is mostly found in dust collectors with high wind speeds or dusts with strong grinding properties. When the filter bag is damaged on one side, the dust is washed and damaged diagonally, and the damage is continuously expanded with time. Severe breakage of the filter bag can cause ring fracture of the filter bag. .
The inner wear of the lower part of the filter bag is more common in the contact position with the bag cage, and most of the difference between the bag cage and the bottom of the bag cage diameter is too large, which causes the filter bag to change the amplitude when cleaning and filtering, and the bag cage is rubbed and damaged. Replace the high-quality bag cage can be solved.
Bag bottom wear
The outer side of the filter bag is worn: the damaged surface has obvious wear marks. The bottom sewing thread and the filter base fabric were cut off, and the bottom of the bag was broken or fell off as a whole. This type of wear is due to the high level of material in the hopper and the airborne dust particles directly scour the bottom of the bag causing wear. By increasing the ash bucket discharge capacity and adjusting the dedusting system of the dust collector ash hopper, the dust accumulation can be avoided too high and vortex abrasion filter bags can be avoided in the hopper.
The inner wear of the bottom of the filter bag is mostly found in the bottom of the bag cage is too small or the filter bag is too long, the bag cage can only make the bottom of the bag. When the filter bag is cleaned and filtered, the bottom of the filter bag is shaken when it is switched, and the bottom of the filter bag is worn.
Dust bag inner wear
The inner damage of the filter bag is mostly caused by the difference between the outer diameter of the bag cage and the inner diameter of the filter bag, which causes the filter bag to be cleaned and the swing amplitude is too large during filter switching. The inner side of the filter bag is rubbed with the cage, causing the inner side of the filter bag to wear out.
The inside of the filter bag is damaged at the position of the bag cage. There are traces of corrosion on the wear, and most of the bags are etched on the surface of the bag cage. At this time, the surface of the bag cage is like sandpaper, and the filter bag is severely rubbed once every cleaning. Finally, wear the filter bag. Use a high-quality bag cage that matches the filter bag to avoid abrasion inside the filter bag.
The dust bag is the heart of the entire dust collector. The failure of the filter bag can make the entire equipment unable to operate normally. The wear of the filter bag is mainly related to the design and application, manufacture, and installation quality of the filter. The wear process begins locally, but as soon as a small wear hole is formed, it will spread quickly, causing greater damage to the filter bag. Therefore, strengthening the inspection and inspection during operation and early detection of small wear are also important factors to avoid causing large-scale filter bag wear.