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De-dusting technology of dust filter bags for powder mills

Dust filter bag can be called the heart of bag filter, usually called filter dust bag, dust filter bag, dust collection bag, dust accumulation bag, dust bag, dust collector bag, dust collector cloth bag, etc. Dust bag is the key part of bag filter operation process, usually cylindrical filter bag is hung vertically in the dust collector.
Bag de-dusting skills for in-mill ventilation
De-dusting filter bags
The exhaust gas of open-flow mill or raised-cycle mill is mainly used for in-mill ventilation, the dust concentration of the exhaust gas is mostly below 150g/Nm3, the temperature of the exhaust gas is below 100℃, and the moisture in the raw material mill exhaust gas is large, so it is difficult for the usual low-energy dust collector to get used to the nature of this exhaust gas. For example, in former times, FD series, ZC series back-blowing bag dust collector and chamber pulsation back-blowing dust collector which are widely used in cement plants are poor in application, and even some pulse dust collectors such as MC pulse dust collector are also poor in application.

The new pulse dust collector, off-line dust collector such as air box pulse dust collector, online dust collector such as Coanda blowing dust bag using the leading filter media skills, dust cleaning skills, control skills, now completely satisfied with the mill ventilation dust removal requirements. The new type of back-blowing bag dust collector developed for mill ventilation, such as HM combination bag dust collector developed by Hebei Xian County Dust Collecting Equipment Factory, uses new structure design to deal with the problem of high dust concentration, the use of anti-dew needle-punching felt filter media and the control of dust cleaning parameters make the dust cleaning of filter media easier, compared with the pulse dust bag dust collector, the back-blowing dust collector does not need high pressure air source, and the operation energy consumption has been reduced, whether the new type of pulse Whether it is a new type of pulse dust collector, or HM blowback bag dust collector, there are many practical uses in mill ventilation dust removal, and the effect is satisfactory.
Bag de-dusting skills for commodity collection

Whether it is a large rotary kiln cement plant, or a vertical kiln cement plant, or a cement grinding station under construction in China, the new high production and energy saving grinding system with vertical mill, extrusion mill and high efficiency powder separator has been used a lot. In the system as a commodity collection of bag dust technology to be able to deal with the dust concentration of up to 1000g / Nm3 of exhaust gas, but also must have a very high collection efficiency and reliability. The development of filter media technology, ash cleaning technology and dust collection process technology provides a guarantee for the commodity collection technology.

Ash cleaning technology
The dust concentration of the gas handled by the dust collector is high, so the bag type dust collector uses the pulse cleaning method, and the typical pulse cleaning includes air box pulse and blowing pulse.

Air box pulse skill
Air box pulse dust collector is used a lot in cement plant for high concentration dust cleaning, because of the offline dust cleaning method, so the dust is easy to strip and settle, the structure of air box pulse is relatively simple, and the operation protection is convenient. The disadvantage is that although the compressed air reaches 0.6MPa, the filter bag cannot be too long because it is sprayed on the box, usually within 2.5m, which is a very large area for a large air volume dust collector.

Blowing pulse skill
For some large air volume bag dust collectors, in order to reduce the floor space. It is necessary to make the filtering suit long. There are many large air volume bag dust collectors in foreign cement plants, and they all choose long bag pulse blowing skills, which are made by compressed air blowing directly to the dust filter bag through the nozzle, so the filter bag can be made very long. High-pressure pulse (0.6MPa compressed air), such as ring gap blowing dust collector, online dust removal bag can do 7 meters, dust removal is still very good, and dust removal during the bag does not stop working, the system's resistance air volume fluctuations are not large. If you choose offline cleaning, the filter bag can do more than 10 meters. Another is low-pressure pulse skills, the use of offline blowing and engulfing electromagnetic pulse valve skills, not only the filter bag can do 7 meters, and the blowing pressure is only 0.15MPa, about 1/4 of other pulse dust collector, compressed air consumption is about 1/3, and the dust cleaning effect is appropriate.

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