How to choose the filter material according to the nature of the dust
First, the flammability and explosiveness of dust The choice of filter media should first consider the flammability of the dust and the lower explosion concentration of the dust. If it is flammable dust and explosive dust, you should consider using anti-static filter material or flame-retardant filter material when making the filter element to prevent dust explosion caused by static flashover in the dust removal system. When a spark may be introduced into the filtration system, a filter material with a flame retardant function should be selected to avoid burning of the filter element. Second, the hygroscopicity and deliquescence of dust The ability of dust to absorb moisture in a gas is called hygroscopicity. When the humidity of the hygroscopic dust increases, the cohesive force and adhesive force of the dust increase, which causes the dust to adhere to the surface of the filter material to form a plate, which makes the filter core difficult to clean, and even the filter element is scrapped. Some dust (CaOCaCl2KClMgCl2) continues to undergo chemical reaction after moisture absorption, and its properties and morphology change, which is called deliquescence and pastes the filter material. For wet and deliquescent dust, when selecting the filter element, oil-proof waterproof and anti-fouling filter material or PTFE-coated filter material should be considered. The filter element made of these filter materials has a smooth surface and easy to clean the filter core surface during pulse backflushing. Dust. Third, the shape of the dust, the particle size distribution and the concentration of dust in the filtration system In the filtration system, when the ultra-fine dust of the sub-micron level is filtered, and the concentration of the imported dust is very low, when the filter element is selected, the wood pulp fine fiber filter material and the nano-synthetic fiber filter material should be considered. This can increase the effective filtration area of ​​the filter element per unit volume, thereby reducing the wind speed and improving the filtration efficiency. Most of the dust generated in the process engineering is irregular dust, such as carbon black and foundry sand, and the average particle size is between (0.1-15) micrometers. If the engineering side requires high filtration efficiency, the filter element is selected. When referring to the filter material made of PTFE film on the polyester fiber substrate, the whole filter element has good stiffness and durability, and can achieve high filtration efficiency. Fourth, the abrasiveness of dust The abrasive wear of the filter material is called the abrasiveness of the dust. It is related to the shape, size, hardness, dust concentration and air flow rate of the dust. In common dusts such as aluminum powder, silicon powder, coke powder, carbon powder, etc., it belongs to high abrasion dust. For dust with high abrasion resistance, when making filter elements, it is necessary to use filter materials with good wear resistance, such as high strength and fine denier. A polyester fiber nonwoven fabric or an impregnation treatment on a polyester fiber nonwoven fabric to increase the abrasion resistance of the filter material. Concerned about surprises Label: filter material filter area impregnation treatment backflushing Previous: The use points of the hanging tools for the anodizing of aluminum and aluminum alloys Next: The requirements for the classification of springs in the hardware mold industry
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