The influence of filter material characteristics on the quality of dust removal bags

The temperature resistance performance of the dust removal bag filter material (allowing continuous operation temperature and able to withstand instantaneous working temperature). As a filter material manufacturer, it is the responsibility of the dust removal bag manufacturer to comprehensively propose the allowable continuous operating temperature and instantaneous working temperature of the selected filter material based on the expected service life of the dust removal bag proposed by the user (such as 30000 operating hours or 45 months, etc.), and the mild and chemical corrosion resistance (oxidation and hydrolysis resistance) characteristics of the fiber raw material. If the actual flue gas temperature often exceeds the allowable continuous operating temperature of the filter material, users must consider: or take measures on the system to improve the heat exchange efficiency of system equipment such as air preheaters and reduce the exhaust gas temperature; Or reduce the requirement for the expected service life of the dust removal bag (such as giving up the requirement of 30000 operating hours). It is also reasonable to propose an instantaneous operating temperature for the filter material, as the system may indeed experience instantaneous overtemperature (overtemperature refers to situations where the continuous operating temperature is exceeded). Two points must also be noted here: firstly, the allowable instantaneous working temperature of the filter material cannot be exceeded; Secondly, overtemperature is instantaneous, and there is a time convention that generally requires a few minutes for each overtemperature, and the total annual overtemperature time cannot exceed many hours. Dust removal bag manufacturer

Thermal shrinkage rate of dust removal bag filter material. Due to the fact that most of the filter materials are made of chemical fibers, they will undergo thermal shrinkage under certain temperature conditions, so heat setting treatment must be carried out in the production of filter materials. The heat setting process is crucial and often kept confidential by filter material manufacturers. There have been cases both domestically and internationally where the top of the dust removal bag is not fixed due to the thermal shrinkage of the filter material, causing the flower board to emerge from the top of the bag cage or breaking the bottom of the dust removal bag. However, dust removal bags, especially those with a length of 8-9 meters, will have a self gravity force combined with the weight of accumulated dust pulling down the dust removal bag after hanging on the flower board. Therefore, the thermal shrinkage rate and elongation rate of the filter material also need to be balanced and considered. Excessive heat setting or requiring a low heat shrinkage rate may also cause elongation of the dust removal bag during use, thereby shortening its actual service life.