The filter bag is the main component of the bag filter, and its cost accounts for a very large proportion of the bag filter. It can be said that the service life of the filter bag determines the operation effect of the bag filter. At present, the material of the filter bag is mainly polymer synthetic fiber, in which the filter wind speed, flue gas temperature, mechanical damage, sandblasting and other factors wear, and the adhesion of grease directly affects its service life.
Indoor temperature dust removal bag involves: polyester needled felt filter bag, antistatic polyester needled felt filter bag, polyester needled felt filter bag that is easy to remove dust, polyester film needled felt filter bag and other materials. These can be used for extended periods of time at room temperature. The other is a high temperature dust filter bag, which specifically covers: Metas needle-punched felt filter bag, Fumex filter bag, glass fiber needle-punched felt filter bag, pps acid and alkali-resistant needle-punched felt filter bag and other heat-resistant materials. The dust removal equipment uses pps filter bags, the melting point is 285, the elongation at break is 5.0g/d, and the limiting oxygen index is 34. It is a crystalline high performance engineering thermoplastic with heat resistance, chemical durability, flame resistance and many other properties.
High temperatures can damage the filter bag. When the dust concentration temperature is higher than 160°C, the temperature will significantly interfere with the service life of the filter bag. The basic principle is that the loss of the service life of the filter bag will gradually increase with the increase of temperature. Damage (depending on the material of the filter bag), and if the dust concentration is mixed with other compounds, the filter material is easily oxidized, which can weaken the strength and break easily. The loss of service life will become more and more serious, and eventually the filter bag will be rusted. . Therefore, the accident of long-term over-temperature operation and sudden rise in a short time should be eliminated.
The effect of low temperature condensation on filter bags. When the temperature is low in winter and there is local air leakage, it is easy for the local temperature to be lower than the temperature at the exposure point, resulting in a decrease in the characteristic index of the filter bag. In severe cases, the filter bag may agglomerate in a large area and reach a certain weight, causing the filter bag to fall off and seriously affecting the service life of the filter bag. In addition, the northern regions have cold winters. If the heat preservation is not good, it is easy to accumulate ash on the inner wall of the ash hopper, which will cause the ash hopper to block the ash. In addition, in the initial stage of the spot furnace, the ash hopper is under negative pressure, and the moisture generated by the lower hydraulic ash removal will also be brought into the ash hopper, which will easily cause the ash wall to accumulate on the inner wall of the ash hopper, causing serious consequences.
