The following briefly analyzes the performance of the dust filter element from these aspects:
Filtration efficiency
The filtration efficiency of the dust filter element is related to the structure of the filter material on the one hand, and it also depends on the dust layer formed on the filter material. From the perspective of the filter structure, the filter efficiency of the short fiber is higher than that of the long fiber, and the filter material of the felt is higher than the fabric. High filter material. From the formation of the dust layer, for the thin filter material, the dust layer is destroyed after the dust removal, and the effect is reduced much. However, the thick filter material and the dust can retain part of the dust in the filter material to avoid excessive cleaning. In general, the highest efficiency can be achieved without the filter material breaking. Therefore, as long as the design parameters are properly selected, the filter element should have no problem in dust removal.
Dust holding capacity
Dust holding capacity, also known as dust load, refers to the dust accumulated on the filter material per unit area when the given resistance value is reached (kg/m2). The dust holding capacity of the filter element influences the resistance and cleaning cycle of the filter material. In order to avoid a lot of ash cleaning and extend filter life, it is generally required that the dust content of the filter element be the largest. The dust holding capacity is related to the porosity and air permeability of the filter material, and the felt filter material has a larger dust holding capacity than the fabric filter material.
Air permeability and resistance
Breathable filtration refers to the amount of gas passing through a unit of area under a given pressure differential. Filter resistance is directly related to air permeability. As the constant pressure difference of the calibration air permeability, the value of each country is different. Japan Wood, the United States to take 127Pa, Sweden to take 100Pa, Germany to take 200Pa, so select the size of the air permeability to take into account the pressure difference taken during the experiment. The air permeability depends on the fiber fineness, the type of pile, and the weaving method. According to the Swedish data, the air permeability of the filament filter medium is 200-800 cubic meters/(square meters ̇h), and the air permeability of the short-filament fiber travel is 300-1000 cubic meters/(square meters ̇h). Felt filter air permeability is 400-800 cubic meters/(square meter ̇h). The higher the air permeability, the greater the amount of air per unit area allowed (specific load).
Air permeability generally refers to the air permeability of the clean filter material. When there is dust on the filter cloth, the air permeability should be reduced. According to the different nature of dust, the general air permeability is only 20%-40% of the initial air permeability (air permeability of clean filter), and even 10%-20% for fine dust. The ventilation string is reduced, the dust removal efficiency is increased, and the resistance is greatly increased.
Service life
The life of the filter element refers to the time when the filter element breaks under normal use conditions. The life of the filter element depends on the quality of the filter element itself (material, weaving method, post-treatment process, etc.) and the conditions of use (temperature, humidity, dust properties, cinder method, etc.) Two factors. A good dust removal process under the same conditions can also extend the life of the filter.