Reasons for damage to dust removal bags: 1. Burning: If the dust removal bag is exposed to smoke exceeding its normal operating temperature for a long time, it is easy to harden, shrink, or melt, causing holes in the bag. The initial layer of the bag is not thick enough, and sparks brought in by smoke or dust heating can also cause holes in the dust removal bag to burn out. The burning of dust removal bags is mainly reflected in the replacement of dust removal bags. Due to the lack of pre coating after online replacement, the high-temperature flue gas carries sparks and directly contacts the dust bag, which can easily cause the dust removal bag to be burned. Preventive measures against burning: The initial layer thickness on the surface of the dust removal bag. 2. Wear and tear: Wear and tear of dust removal bags mainly occur in the middle of the dust collector, and on a single dust removal bag, it mainly occurs within 1 meter of the bag outlet. The main reason is uneven distribution of flue gas, with high flow velocity in the middle of the single chamber and high filtration gas velocity near the outlet of a single dust removal bag, resulting in dust impact, wear of the bag, and damage to the tension of the fabric fibers of the dust removal bag, which can easily cause local bag perforation and short service life. Replace the dust bag for frequently worn parts with a new bag. 3. Excessive filtration speed can cause the initial dust layer to break and the dust to impact the bag, resulting in excessive wear. If the bag is cleaned too many times at this time, it can easily cause the fabric of the bag to loosen, accelerating the wear of the bag. If the dust content in the flue gas exceeds the design standard, it will also accelerate the wear of the bag. Excessive accumulation of dust in the small ash hopper can accelerate the wear of the bag due to excessive dust content in the flue gas chamber. 4. The distance between dust removal bags is too small and the keel is bent, which can easily cause wear and tear between the bags. The difference in diameter between the cloth bag and the keel is related. If it is too small, the cleaning effect will be poor, which will shorten the cleaning cycle and increase the pressure of the blowing air. If it is too large, the friction between the cloth bag and the keel will accelerate wear. Special attention should be paid to certain filter cloths that exhibit significant temperature changes and elongation characteristics. 5. When there are holes or burrs at the welding point of the keel, or rough surfaces caused by corrosion, it will also accelerate the wear of the cloth bag. Poor sealing between the bag and the porous plate can cause wear and tear at the folds of the bag. 6. The alignment of the Venturi tube or pulse tube with respect to the cloth bag is not correct, which can easily cause the air flow from the blowing tube to directly flush the upper part of the cloth bag and cause wear. Cleaning the cloth bag too frequently can accelerate its wear and tear. The factors that determine the quality of dust removal bags: Some high polluting enterprises often use bag dust collectors, and the dust removal bags are easily broken and damaged, which affects the service life of the bag dust collector. So, how can we extend the service life of the bag? We should choose different types of dust removal bags according to the environment that requires dust removal. First, confirm the humidity, temperature, dust particle size, concentration, and other aspects of the area that requires dust removal. Determine whether a moisture resistant dust bag is needed. If the dust particles in the air are small, it is also necessary to choose materials with denser dust bag materials. Generally speaking, polytetrafluoroethylene material has good dust removal performance at both high and low temperatures. It has strong chemical stability, is not easily aged, and has good adaptability to humidity and temperature. Especially for working environments with high temperature, high humidity, and fine dust, the dust removal effect is particularly good. Generally speaking, the usage time can reach about three years. The use of polytetrafluoroethylene can not only benefit the environment, but also bring huge economic benefits.. Its dust removal effect can be achieved, basically by emissions. If the dust removal bag is prone to breakage at work, you can consider increasing the density of the skeleton steel bars and circular rings of the dust removal bag. 8-22 pieces are suitable. If the spacing between the steel rings of the dust removal bag can be reduced to between 400-500 millimeters. This can increase the rigidity of the dust removal skeleton and prolong the service life of the cloth bag. Why are dust removal bags burned by high-temperature dusty flue gas? The dust removal bag is the key to determining the performance of the bag filter. In the entire dust removal equipment, the cost of replacing and maintaining the dust removal bag accounts for about 60-70%. Therefore, in the daily operation of bag filter, the maintenance and upkeep of the dust removal bag should be in place. Maintaining the dust removal bag well can not only improve its filtration performance but also extend its service life. It will not cause early damage to the filter bag and save the cost of replacement and repair. This is the importance of maintenance, but in daily work and operation, the filter bag cannot be free from damage from dusty flue gas, such as high-temperature dusty flue gas. 1. We need to know that high-temperature dusty flue gas can be fatal to the damage of dust removal bags. For example, in a coal powder drying kiln, this is a typical high-temperature dusty flue gas. After drying, the coal powder particles are very small and sticky, and the dust removal is not ideal, resulting in a large amount of dried coal powder remaining on the surface of the dust removal bag. However, this dried coal powder has a very low ignition point. When the high-temperature flue gas enters the dust collector, it ignites the coal powder on the surface of the bag, causing the entire dust removal bag and skeleton of the dust collector to be burned. 2. Mars burning through, the damage of sparks in dusty flue gas to dust removal bags is also very serious. For example, electric furnaces, blast furnaces, mixed iron furnaces, and cupolas will have a large amount of sparks mixed into the dusty flue gas during the production process. If the sparks are not treated properly, especially when the dust layer on the surface of the bag is relatively thin, the sparks will directly burn through the bag. However, when the dust layer on the bag is thick, it is difficult for the sparks to directly burn through the dust removal bag, but instead form dark colored baking marks on the surface of the bag. 3. High temperature shrinkage is another type of damage caused by high-temperature dusty flue gas to dust removal bags. High temperature shrinkage keeps the bag under constant stress, causing deformation, hardening, and brittleness of the dust removal bag, which accelerates strength loss and shortens its lifespan.
