fume purification integrated system selection should be considered:

1. Use temperature

For fume purification integrated system, its use temperature depends on two factors, the first is the maximum allowable temperature of filter material, the second is the gas temperature must be above the dew point temperature. At present, due to a large number of glass fiber filter material selection, its maximum use temperature up to 280℃, higher than the temperature of the gas must be taken cooling measures, lower than the dew point temperature of the gas must be taken temperature measures. For fume purification integrated system, the relationship between fume purification and dust removal efficiency is not obvious, which is different from electric fume purification integrated system. The change of temperature will affect the specific resistance of dust and affect the efficiency of dust removal.

2. Treated air volume (Q)

Treatment air volume refers to the volume of gas that can be purified by the dust removal equipment in a unit time. The unit is 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 fume purification integrated system.

fume purification integrated system can not be operated at fume purification integrated system beyond the specified air volume when it is designed or selected according to the air volume. Otherwise, the filter bag is easily blocked and its life is shortened. The pressure loss increases greatly, and the dust removal efficiency also decreases. But also can not choose too much air volume, otherwise increase the equipment investment and cover an area. The reasonable choice of treatment air volume is often determined according to the process situation and experience.

3. Dust concentration at the entrance

The inlet dust concentration, which is determined by the process of fume purification integrated system, is another important factor second only to the treated air volume when designing or selecting a fume purification integrated system. In terms of g/m3 or g/Nm3.

For fume purification integrated system, the inlet dust concentration will directly affect the following factors:

⑴ Pressure loss and cleaning period. With the increase of inlet concentration, the ash accumulation speed in the same filtration area is fast, and the pressure loss is increased accordingly. As a result, the cleaning times have to be increased.

⑵ Wear and tear of filter bag and box. In the case of strong abrasive dust, the amount of wear can be considered to be proportional to the dust concentration.

It is necessary to collect dust in advance. Pre-dust collection is to add a level of dust removal equipment before the fume purification integrated system entrance, also known as pre-level dust removal.

(4) The ash discharge capacity of the ash discharge device. The ash discharge capacity of the ash discharge device shall be based on the dust that can be discharged completely. The dust quantity is equal to the dust concentration at the inlet multiplied by the air volume treated.

⑸ Mode of operation. fume purification integrated system can be divided into two operating modes: positive pressure and negative pressure. In order to reduce fan wear, positive pressure is not suitable for those with high inlet concentration.

4. Operating pressure

The operating pressure of fume purification integrated system is determined according to the static pressure value of the fume purification integrated system and the installation location of the fume purification integrated system. It is also the design pressure tolerance value of fume purification integrated system.

5. Dust concentration at the outlet

Export dust concentration refers to the emission concentration of fume purification integrated system and is expressed in the same way as the import dust concentration. The export dust concentration should be determined by local environmental protection requirements or user requirements. The emission concentration of fume purification integrated system can generally reach below 50 g/Nm3.

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