How long can dust bag be used normally?

Feb 08, 2023

There is a time limit for the service life and use cycle of the dust filter bag. Generally speaking, the theoretical life of the dust filter bag is generally about 3-4 years. In fact, in the process of use, the cycle of the dust collector bag is different. For example, the working conditions are bad, whether it exceeds the tolerance range of the dust removal bag, such as high dust concentration, high temperature and other factors, which will cause the dust removal bag to have a long service life. Therefore, when we purchase dust removal bags, we should look at what kind of bags we should focus on according to the industry requirements and working conditions characteristics, such as wear resistance, corrosion resistance, acid resistance, oxidation resistance, etc., and then customize the dust removal bags. In addition to the daily maintenance and maintenance of various dust removal bags, the service life of the dust removal bags will be greatly increased on the whole.

1. High temperature oxidation affects cloth bags
In order to use the filter material for power station boilers for a long time in the design life of the flue gas that needs to be dedusted, to ensure that its characteristic indicators do not decrease, the surface singeing, polishing, heat setting, spark-proof, coating, A series of special processes such as waterproof, oil-proof and anti-static. When the oxygen content of the high-temperature flue gas is high, the filter material will be oxidized, which will weaken the strength and be easy to break.

2. Low temperature condensation
When the exhaust gas temperature is lower than the dew point, condensation will occur, which will reduce the characteristic index of the filter bag. In severe cases, the surface area of the filter bag will be hardened and even fall off together with the filter bed, which will seriously affect the service life of the filter bag. In addition, the winter in the northern region is cold, which is easy to cause the phenomenon of cake sticking on the inner wall of the ash hopper, so that the ash cannot flow out normally.

3. The running strength of the cloth bag
In actual operation, the operating conditions need to be changed frequently, so that the environmental conditions of the filter bag exceed the range required by the design performance indicators, such as the increase of exhaust gas temperature and the increase of dust concentration, etc., which will cause the filter bag. The service life is lower than the design life.

4. The actual temperature of the bag
When the exhaust gas temperature is around 140℃, the life of the filter material can reach 40000h. When the flue gas temperature rises to 150℃, the life loss of the filter material gradually increases with the increase of temperature, and when it reaches above 230℃, the filter The life of the material is reduced to zero, and the filter material will be burned; therefore, the exhaust temperature should be strictly controlled during operation to prevent long-term over-temperature operation and short-term temperature surge accidents.

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