Dust bag should be used to prevent gas from cooling in the bag room to below the dew point during operation. In particular, it is necessary to pay attention to the use of bag filter in negative pressure. To prevent condensation, it is necessary to maintain the temperature of the gas in the dust collector and its system. Above its dew point of 25~35°C (such as the kiln mill’s dew point temperature of 58°C, the operating temperature should be above 90°C), to ensure the outstanding application of the filter bag. Because its shell often has air leakage, so that the bag Room gas temperature is lower than the dew point, the filter bag will be damp, resulting in the dust is not loosely, but sticky to the filter bag, the fabric hole is blocked, the formation of dust failure, so that the filter pressure drop is too large, can not Continuous operation, some bags of dust can not dust, so the use of scientific and rational use of reasonable maintenance is a more practical approach.
The dust bag is one of the core dust removal structures of the bag filter, and it is also a relatively direct dust removal component. If the dust bag can maintain the good condition, the bag filter can exert its effect as much as possible during operation and improve the dust removal efficiency.
Ordinary filter material structure is a layer of nonporous porous structure, pore size 5-50 u, so the larger particle size of the dust particles can easily infiltrate deep pore blockage filter, the use of ordinary filter material in the early filtration efficiency is low Only when the initial layer of dust is formed, the filtering effect is changed from deep filtration to deep filtration and surface filtration to achieve higher filtration efficiency, but at the same time it will increase the running resistance. After the ordinary filter material is cleaned, the filtration efficiency will be reduced, so its filtration efficiency is unstable, and the number of cleaning operations required is large, and the service life of the filter bag is short.
The filter cloth material is the key to the bag filter. The filter cloth with good performance, in addition to the specific density and breathability, should also have good corrosion resistance, heat resistance and high mechanical strength. Fibers with good heat resistance have a heat resistance of 250-350°C. In order to prolong the life of the cloth (filter) bag and reduce the wear of the bag mouth, it is recommended that the contact between the bag cap, clamp band, short pipe and filter bag be covered with a rubber pad, and it is estimated that the life of the cloth (filter) bag will be greatly extended. The quality of bag caps, clamps, and short tubes will also directly affect the life of fabric bags. These parts should be smooth, burr-free, and should be rolled out of the flange to prevent the bag from falling off. The clamps are also made of stainless steel and should be easy to install and fasten. It is often found on the site that these fittings are worn through with the cloth (filter) bag, far less than the life of the dust bag itself.
1) The new craft old bag should not be mixed, to prevent the damage from time to time not affect the normal operation of the dust removal equipment.
2), bag aging. First of all because of the following factors, the need to conduct a search of factors, the adoption of elimination methods and replace the dust filter bag. 1 hardening due to abnormal high temperature shortened; 2 due to reaction with acid, alkali or organic solvent vapor; 3 and water reverberation.
3), filter cloth should not be hung too loose or too tight, too loose and simple dust, too tight and simple pull bad.
4), replace the cloth bag, first with compressed air blowing, and then see if there is no hole, there is a hole left after the replacement repair. If the bag is covered with dust, washed with water, leave dry after the replacement.
5) The obstruction of the dust bag. When the bag is congested and obstructed, the resistance increases, which can be manifested by the reading of the differential pressure meter. The obstruction of the bag is the primary factor that causes the bag to wear out, perforate, drop, etc., resulting in the obstruction of the dust bag. Factors, the following table to view and repair. Usually adopt the following methods: 1 Temporarily strengthen the cleaning, to eliminate the obstruction of the bag; 2 Some or all replacement bags; 3 adjustment device and operating conditions.