Five factors to extend the service life of industrial dust filter bags

The service life of industrial dust filter bags is a comprehensive indicator, but industrial dust filter bags can be regarded as the core part of the comprehensive indicators of dust removal equipment, so the maintenance and maintenance of industrial dust filter bags are particularly important, and the service life assessment is mainly to test the performance indicators of industrial dust filter bags themselves, such as high-temperature resistance, acid and alkali resistance, and antioxidant performance. Therefore, our research on the service life of industrial dust filter bags is limited to the research on industrial dust filter bags and related factors.

1. Direct impact of high temperature on industrial dust filter bags

When the exhaust temperature exceeds 160℃, the temperature has a significant impact on the service life of industrial dust filter bags. With the increase of temperature, the service life of industrial dust filter bags will gradually increase. When a certain temperature is reached, the industrial dust filter bags will be burned (depending on the material of the industrial dust filter bags). In addition, since each is mixed with other chemicals, when the smoke temperature is high, the reaction of chemicals will be accelerated. Industrial dust filter bags are easily oxidized, resulting in reduced compressive strength and easy rupture. The service life will be more and more seriously consumed and eventually guide to corrosion of industrial dust filter bags.

2. The impact of low-temperature condensation on industrial dust filter bags

When the boiler is lit in winter or working at low load, the temperature of the flue gas is low, and due to local air leakage, it is easy to cause the local temperature to be lower than the dew point temperature. In this way, condensation will occur, and react with SO2 in the flue gas to form acid dew and acid mist, which will cause the industrial dust filter bag to corrode, causing the performance index of the industrial dust filter bag to decrease. In severe cases, it is likely to cause large-scale hardening of the industrial dust filter bag. When it reaches a certain weight, it will cause the industrial dust filter bag to fall off, seriously endangering the service life of the industrial dust filter bag.

3. The impact of filtration wind speed on industrial dust filter bags

The filtration wind speed is a key factor in determining the performance index of dust removal equipment. If it is too high, it will cause excessive pressure loss, causing the industrial dust filter bag to be blocked and damaged quickly. Generally speaking, for dusty flue gas with high dust concentration, fine particles and high abrasiveness, the filtration wind speed should be smaller. Conversely, a larger wind speed should be selected, because the filtration wind speed value of the bag filter will increase the resistance, and the porosity of the dust layer will decrease due to pressure. The airflow will often break through the weak position of the industrial dust filter bag, resulting in "perforation". The larger the filtration wind speed, the more serious the "perforation" of the industrial dust filter bag, so the filtration wind speed should be controlled.

4. Impact of destructive cleaning on industrial dust filter bags

In order to keep the pressure difference of industrial dust filter bags at the design value, the fly ash adhering to the surface layer of industrial dust filter bags should be cleaned regularly. However, the cleaning method or the parameters of the cleaning system have a great impact on the service life of industrial dust filter bags. The adverse effects of shaking, vibration or high and medium pressure pulse back-blowing cleaning systems are not very large, while the low-pressure pulse back-blowing cleaning system is different. The mechanism of its destruction is mainly due to the use of external filtration and the bag cage in the industrial dust filter bag. Therefore, the relative movement between the industrial dust filter bag and the bag cage will cause damage. In addition, the over-frequency of spray cleaning, the close contact between the industrial dust filter bag and the bag cage, and the amplitude changes with the spacing and tortuosity directly affect the service life of the industrial dust filter bag.

5. The impact of air intake on industrial dust filter bags

The air intake method may also directly affect the service life of industrial dust filter bags. If a part of the industrial dust filter bag leaks in one room, the resistance of the smoke passing through the industrial dust filter bag will be reduced, and the pressure difference of the room will be reduced. A large part of the smoke will enter this room, which will increase the flow rate while also increasing the damage of the industrial dust filter bag. Therefore, it is necessary to ensure that the pressure difference of several rooms is relatively uniform. Therefore, choosing a reasonable and feasible air intake method is also a factor that affects the service life of industrial dust filter bags.