The common questions about the filter bag

Over a hundred years of history bag house applications, its biggest advantage is the high collection efficiency (up 99.99%), emission concentration up to 10mg / m3 or less, and also high efficiency rating of 2.5μm or less fine particles may also have a good collection efficiency, and therefore widely used. But after years of bag house operation also exposed some problems, such as the bag easy to damage, condensation and high running resistance, cleaning failure, such as poor ash bucket dumping of ash. (1) high-temperature burned High temperature filter bag damage is fatal. Since the dried coal particles are very small and particularly sticky, cleaning is not ideal, so that a large amount of pulverized coal remaining surface of the bag after drying, dried and pulverized after this, and very low ignition point, when the high temperature flue gas into the dust later, a bag will quickly ignite pulverized coal surface, resulting in the entire skeleton dust filter bag and all were burned. As can be seen, the bag remaining on the surface of a large number of pulverized coal drying, and also visible from the upper left corner of the box to be burned. (2) Spark burn In addition to high temperature burning, the smoke of Mars bag damage is very serious. Such as coke ovens, kilns, furnaces chain, cupola, electric furnace, blast furnace, Mixer, etc. in the production process there will be a lot of smoke mixed with Mars, as Mars treatment is not timely, especially compared with the bag surface dust layer when thin, Mars will burn the bag, form irregular round hole. But when the dust bag surface layer thicker, Mars does not directly burn the bag, and the bag will cause the surface to form a dark colored baking traces. (3) high-temperature shrinkage High temperature flue gas filter bag is another hot shrinkage damage, although each of the different media use temperature, but after the flue gas temperature exceeds its temperature, as they warp shrinkage is too large, the length of the bag the direction of the shorter dimension, bag bottom of the bag tight and skeleton holding force and damage. If the bag is too large zonal heat shrinkable, will bag the radial dimension becomes smaller, the bag will be closely hoop at the skeleton, not even out of the skeleton. So that the bag has been in a state of stress, causing the bag shrinkage deformation, hard, brittle, accelerate wear and tear strength, shortening bag life. Because after the bag tightly hoop deformations in the backbone, in the cleaning bag difficult to deform the detriment of injection cleaning, resulting in high resistance bag. (4) thermal storage hopper dust filter bag burnt After the high temperature dust hopper by income, if you can not be discharged, will be long-term accumulation of dust in the hopper was caused by rising temperature in the hopper, the bag will become brittle in the long-term high temperature bake, harden, is serious burned, especially dust contained flammable substances, it will burn in the hopper, thereby burning bag. (5) Explosion With the popularity of bag filter, bag filter dust explosion also on the rise. Resulting into the Martian dust to cause an explosion, the precipitator inlet duct Blind blasted tens of meters away, severe dust box deformation. Another example of a mechanismÌ¿³§ Shenyang, since a large amount of tar and sawdust and other flammable hydrocarbons in the carbonization process, explosive substances, and tar stuck to the bag over time piled up, when Mars enters after the dust caused a dust explosion. Dust explosion instant energy generated can severely deformed flower plate, bag burst situation.