Performance of Dust Removal Filter

Update time : 2019-04-01 15:29:30

The performance of dust removal filter mainly involves filtration speed, dust removal efficiency, filtration resistance and dust removal methods.
Filtration speed is one of the main factors affecting the performance of filter dust collector. The filtration rate is calculated by the following formula:
v=Q/60×A
In formula:
V - Filtration speed, m/min
Q-Filtration Dust Collector Processing Gas Volume, m3/h
A-Filtration area of filter material for dust removal filter, m2
It is generally believed that the true velocity (Vp )of gas passing through the filter layer is as follows:Vp=v/εp
In formula:
Vp－Real speed of filtration through the filter layer, m/min
εp－The average voidage of dust layer is generally 0.8-0.95.
In the actual operation process, the filtration speed is determined by the type of filter material, the size of dust particle size, the physical and chemical properties and the way of ash removal. High filtration speed will increase the pressure difference between the two sides of the filter material, squeeze the fine dust which has been attached to the filter material, so that the filtration efficiency can not reach the prescribed discharge value or wear the single fiber of the filter material, especially accelerating the damage of the glass fiber filter material. If the filtration speed is small, the volume of the dust collector will be increased, thus the investment will be increased. Table 2-1 lists the filter speed design reference values of bag filter.
Table2-1 Design Reference Value of Filtration Speed of Bag Dust Collector (m/min)

Dust species	Dedusting method
Dust species	Combination of shaking and Adverse airflow	Pulse jet	Reverse air blow
Talc powder, coal, sand blasting cleaning dust, fly ash, ceramic firing dust, carbon black, pigments, kaolin, limestone, sand dust, tin ore, cement (from cooler), enamel firing	0.7～0.8	2.0～3.0	0.6～0.9
Sublimation of ferroalloy, cement discharged from casting dust, alumina, ball mill, sublimation of carburizing furnace, lime, corundum, powder and other fertilizer production, plastics, starch	0.5～0.75	1.5～2.5	0.45～0.55
Sublimates of carbon black, silicon oxide, tin and zinc, and other aerossols, cosmetic powder, detergent powder, milk powder, activated carbon and cement formed by condensation and chemical reaction in gases, etc.	0.45～0.5	0.8～2.0	0.33～0.45
Tobacco, Leather Powder, Mixed Feed, Dust from Wood Processing, Crude Vegetable Fiber (Casuarina, Jute, etc.)	0.9～2.0	2.56～0.6
Asbestos, fibre dust, gypsum, pearlite, rubber production dust, salt, flour, grinding process dust	0.3～1.1	2.5～4.5

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