The dust bag is known as the heart of the bag filter and is the most important part of the operation of the bag filter. In general, the cylindrical filter bag is suspended vertically in the bag filter. . The fabric and design of the dust bag should be as efficient as possible, and should be easy to peel off and durable.
In the process of dust removal, dust particles are trapped on the outer surface of the filter bag when the dust-laden gas particles pass through the dust collector, and the clean gas passes through the filter material into the interior of the filter bag. The dust cage inside the dust collector bag is used to support the filter bag to prevent the filter bag from collapsing, and it also helps the removal and redistribution of the dust cake. For some special working conditions, it is very important to post-treat the dust bag. General conventions are divided into the following categories:
1, burning pressure treatment
This kind of treatment mainly uses the crater against the surface of the fast-moving cloth to burn down the fluff, and then uses a high-temperature roller to smooth the surface of the cloth so that the cloth surface is smooth and easy to remove dust. This will not only improve the filter cleaning performance, but also meet the collection of fine dust.
2, anti-static treatment
Some of the dust in the specified concentration state will easily burn when it encounters sparks. Therefore, for the flammable or explosive dust must use anti-static treated needle felt filter. Anti-static filter material refers to the fiber in the filter material mixed with conductive fibers or woven in the base cloth stripe yarn branch with conductive function, so that the entire filter material has conductive properties, the use of static electricity through the filter to guide the dust Cabinet and floor to prevent explosion caused by static sparks.
3, waterproof and oil treatment
We use a fluorocarbon resin and PTFE impregnated method on the needle felt filter material. The surface of the filter bag is hydrophobic. The water droplets can form a rolling effect on the surface of the cloth, which makes it easier to trap the dust. When the temperature difference is relatively large, the phenomenon of paste bags and corroded bags occurs due to condensation.
4, easy cleaning
Usually it is a mirror surface treatment, or the surface layer is needled with a fine denier fiber surface layer on the surface of the fabric. The fabric is of good deashing performance and can work for a long time at a high filtration speed.
5, PTFE coating treatment
If the particle size of the dust is less than 1 μm, or when the dust has a large amount of adhesion, or when the humidity of the gas contains a large amount, ordinary filter media cannot be effectively filtered. The PTFE-coated film filter material not only has extremely high filtration accuracy, but also has a smooth surface, does not adhere to dust, and is easy to remove dust. At the same time, dust does not penetrate into the interior of the filter material.
6, heat setting treatment
In addition to the post-processing of the dust bag, we also need to heat set the dust bag. The purpose of heat setting is to eliminate the residual stress during the processing of the filter bag, so that the size of the filter bag is stable and the surface is flat. If the size of the filter bag of the dust collector is not stable, the filter bag is easily deformed during use. This will increase the friction between the filter bag and the keel, and the keel in the filter bag will also be difficult to extract. In severe cases, it will lead to Dust accumulation occurs.