1. Processing air volume (Q)
The processing air volume refers to the volume of gas that the dust removal equipment can purify in a unit of time. Units are cubic meters per hour (m3/h) or standard cubic meters per hour (Nm3/h). It is one of the most important factors in the design of bag filter.
2. The use of temperature bag filter temperature depends on two factors, the first is the maximum temperature of the filter material, the second is the gas temperature must be above the dew point temperature. At present, due to the large number of glass fiber filter materials used, the maximum use temperature can reach 280°C. Gas cooling measures must be taken for gases above this temperature, and measures must be taken for gases below the dew point temperature.
3. The inlet dust concentration is the inlet dust concentration, which is determined by the process of the dust point. When designing or selecting a bag filter, it is another important factor after the air flow. Expressed in g/m3 or g/Nm3.
4. Export dust concentration The export dust concentration refers to the dust concentration of the dust collector. The method is the same as the inlet dust concentration. The export dust concentration should be based on the local environmental protection requirements or the user's requirements. The discharge concentration of the bag filter is generally Can reach 50mg/Nm3 or less.
5. Pressure loss Bag pressure is the pressure drop, or resistance, from the inlet to the outlet of the dust collector. The pressure loss of bag dust depends on the following three factors:
(1) Pressure loss of the prepared structure.
(2) pressure loss of the filter material. With the nature of the filter (such as porosity, etc.).
(3) Dust layer pressure loss accumulated on the filter material.
6. The aspect ratio of the filter bag is the ratio of the length and diameter of the filter bag. The aspect ratio of the filter bag is as follows:
Anti hair dryer type - 30 ~ 40
Mechanical shaking type -15 ~ 35
Pulse type - 18 ~ 23
7. Filtration speed Filtration speed is an important factor in the design and selection of bag filters. It is defined as the ratio of the speed at which the filtered gas passes through the filter media, or the ratio of the air flow through the filter media to the area of ​​the filter media. The unit is expressed in m/min.
The filter area of ​​the bag filter is determined, then the size of the processing air flow depends on the selection of the filtration speed. The formula is:
Q = v × s × 60 (m3/h)
In the formula: Q — Process air volume v — Filter wind speed (m/min)
s — total filter area (m2)
8. The operating pressure of the operation pressure bag type dust collector is determined according to the static pressure value and installation position of the device before and after the dust collector and the fan, and is also the designed pressure resistance value of the bag filter.
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