Dust bag is the whole dust removal system plays an extremely important role, but dust bag as a loss of goods also has different degrees of advantages and disadvantages, such as although you can achieve more than 99.99% of dust removal efficiency, but may face accelerated consumption of dust bag due to working conditions, then the dust bag and what are the advantages and disadvantages?

Advantages of dust filter bags

    1. High dust removal efficiency, generally up to 99.99% and above. Exhaust dust concentration is low, generally lower than 50mg/m3, or even up to 10mg/m3 below.

    2. Strong adaptability to dust, can capture high specific resistance dust and dust with high SiOZ + AID3 content, low sulfur, high ash coal dust, not sensitive to the physical and chemical properties of dust.

    3. The inlet dust concentration is within a wide range of variation, which has less influence on dust removal efficiency and resistance.

    4. Simpler structure, smaller land area, lower primary investment, can do online rotation of maintenance and bag change in separate chambers. With dry and semi-dry desulfurization system, it has certain desulfurization effect.

    5. The service life of dust bag can reach 30000 hours.

Disadvantages of dust filter bags

Dust bag filter media is sensitive to the nature of the soot, such as temperature, humidity, acid dew point, oxygen content, etc., although there are already temperature-resistant 170-190 ℃ dust bag, but must be equipped with temperature reduction measures. The following network to PPs dust bag as an example of the relationship between flue gas oxygen content, flue gas temperature, service life. It shows that in the case of ensuring the service life of the dust bag, the higher the oxygen content of the flue gas, the lower the temperature of the dust bag used, because every 10'C increase, the chemical reaction into a double increase. That is to say the original life of 4 years, if the temperature increases by 100C, its life will only be 2 years due to the higher cost of dust bag, so the operation and maintenance costs are higher. Equipment system pressure loss is large, generally at 1500-2000 Pa. Improper combustion control in boiler operation directly affects the service life of dust collector dust bag.

At the initial stage of using dust bag, the main role of dust removal mechanism is inertial collision, diffusion and retention, in addition, electrostatic force and gravity also have a role. During this period, the dust removal efficiency is slightly lower than the normal use period. However, the dust layer (usually called the filter cake layer) that accompanies the dust deep on the surface of the filter media, and the baghouse in normal use into the filter media interior, so that the fiber space is gradually reduced and eventually formed to attach to the period is mainly dependent on this initial layer and the dust layer that gradually builds up afterwards to play a role in dust removal. It usually depends on the fiber density of the filter media in the thickness direction to determine the filtration capacity. That is, the surface area of all the fibers of the filter media (the influence of the gram weight of the filter media; the influence of fine denier, the influence of fiber shaped cross-section, the influence of fiber specific gravity, etc.).

In the case of ensuring the service life of the dust bag, the higher the oxygen content of the flue gas, the lower the temperature of the dust bag used, because every 10'C increase, the chemical reaction into a double increase. That is to say the original life of 4 years, if the temperature increases by 100C, its life will only be 2 years due to the higher cost of dust bag, so the operation and maintenance costs are higher. Equipment system pressure loss is large, generally at 1500-2000 Pa. Improper combustion control in boiler operation directly affects the service life of dust collector dust bag.