The degree of surface smoothness of the filter material has a great influence on the dynamic running resistance of the filter material. The initial resistance of the filter depends on the air permeability of the filter itself, and the resistance during operation is many times larger than the initial resistance. The running resistance depends on the smoothness of the surface of the filter material and the cleaning effect. It is generally desirable that when the filter material is to have the same filtration efficiency, the larger the air permeability, the better, that is, the lower the resistance, the better, because it can save a lot of energy. In the dust remover using gas flow back-flushing, when using the same pressure and same air flow for cleaning, the use of a high-permeability woven fabric as a filter bag results in a better cleaning effect than the use of a low-performance woven fabric. . Therefore, in the case of ensuring that the filter material achieves higher filtration accuracy, how to increase the air permeability of the filter material and increase the degree of surface smoothness, reduce the dust adhesion, and reduce the running resistance are the topics that the filter material production plant should first study. The surface resinized and smooth finished needled filter felt developed by our factory has an air permeability more than 50% higher than the ordinary calendered filter media, and the surface smoothness is smoother and smoother than the calendered finishing.
The water-repellent and oil-repellent filter bag is formed by padding, pre-baking and baking treatment with a hydrophobic agent and an oleophobic agent. The hydrophobic agent and oleophobic agent are rapidly dried and then attached to the surface of the filter fiber in a net shape, thereby reducing the surface tension of water and oil and the filter bag, so that the wet filter medium formed by water, oil and dust is not Will adhere to the surface of the filter bag, thus avoiding the paste bag phenomenon.
The water-repellent and oil-repellent filter bag is usually used when the temperature of the dust collector box is lower than the dew point temperature and the humidity of the dust-containing gas is relatively high. The
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Under normal circumstances, if the acidity of the dust-containing gas is small, the dew point temperature is 40-60°C. If the acidity is large, the dew point temperature may be as high as 120°C. The
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The production process of water-repellent and oil-repellent filter bag is as follows: fiber opening-carding-paving netting-pre-thorn-primary thorn-felting-singeing-calendering-impregnated PTFE (water repellent)– Drying – stereotypes – rolling – coils. The
The filter bag of the filter cloth treated with waterproof and oil-repellent treatment is used in the occasion with larger moisture content. Compared with the ordinary filter bag, because the filter material is not easy to block the paste bag, the service life of the bag is prolonged and the cleaning cycle can be prolonged. The flow rate is also increased, so it can save a lot of energy and maintenance costs.