Filtering wind speed affects the service life of filter bag
Although there are many reasons that affect the service life of bag filter bag, according to the experience summary of our company engaged in dust removal for many years, the key to affect the service life of dust removal filter bag is the selection of filtration wind speed. Dust removal cloth bag can be called the heart of the dust collector. We have a wide range of filter media for filter bag.The selection of filter bag is very important, which directly affects the dust removal effect of the dust collector. The service life of dust removal filter bag is also one of the indicators to measure the performance of bag filter. The service life of the dust removal filter bag is generally defined as the time used when the damaged dust removal cloth bag accounts for 10% of the total dust removal filter bag. It is related to the material of the dust removal filter bag, the temperature, humidity, composition, acid dew point, dust nature, the structure of the dust collector and the ash removal method. At the same time, it is also affected by the maintenance and management of the bag type dust collector, the ash removal frequency, filtration wind speed and dust temperature. Generally speaking, it is normal for the dust removal filter bag to be used for 1-3 years. The relationship between the service life of the dust removal filter bag and the filtration wind speed is: the higher the wind speed is, the easier the dust removal filter bag is to be damaged.
That is to say, the filtration wind speed of the bag filter directly affects the life of the bag filter, so we need to determine the filtration wind speed of the bag filter through reasonable design and calculation. The determination of the filtration wind speed of the bag filter generally follows the following principles:
① Filtration wind speed is an important technical and economic index of bag filter’s gas processing capacity. Generally, if the filtration wind speed is large, it indicates that the dust removal equipment is compact and the manufacturing cost is low, but the resistance is large and the efficiency is low; On the contrary, if the filtration wind speed is small, the equipment resistance is low and the efficiency is high, but the dust removal equipment is huge, the manufacturing cost is high, and the floor area is large.
② From the perspective of dust particle size, the filtration wind speed value of bag filter for handling fine dust should be smaller, while the filtration wind speed value of bag filter for handling coarse dust can be larger. From the perspective of filter bag types of bag filter, the allowable filtration wind speed of high-temperature glass fiber dust removal cloth bag is less, generally not greater than 0.5m/min; Because the filtration wind speed of the bag type dust collector will increase the resistance, and the dust layer will reduce the porosity under pressure, the air flow will break through the weak place of the dust removal filter bag, that is, “perforation” will occur. The larger the filtration wind speed is, the more serious the perforation of the dust removal cloth bag will be. However, for polyester needle felt dust removal cloth bag, due to its large dust capacity and good air permeability, the filtration wind speed is higher when the “perforation” phenomenon occurs, so the wind speed can be selected to be larger. In products,the envelope filter bags are the most popular product，if you need a filter bag, please contact our filter bag manufacturer.