Various factors and conditions should be considered when selecting an exhaust fan for soldering station. Let's list them one by one:

1. Model selection according to gas treatment volume

The amount of gas to be treated is a decisive factor in determining the size and type of the precipitator. For large gas volume, it is necessary to select a precipitator that can handle large gas volume. It is often uneconomical to use multiple precipitators that can handle small gas volume in parallel; It is easy for Zui to meet the environmental requirements of dust source point control and dust emission for which type of dust remover should be used for small gas volume.

Since it is sometimes difficult to predict the impact of the operating environmental conditions after the dust remover enters the actual operation, it is necessary to ensure a certain margin or reserve some space that may increase the equipment when determining the capacity of the equipment.

2. Type selection according to dust dispersion and density

The dust dispersion degree has a great influence on the performance of the dust remover, while the dust dispersion degree is the same, and there are differences due to different operating conditions. Therefore, when selecting the form of dust remover, the first thing is to accurately grasp the dispersion of dust. If the particle size is more than 10um, cyclone dust remover can be selected. If the particle size is more than several microns, electrostatic precipitator and bag type dust remover should be selected. The specific selection can be made by referring to the type and performance table of common precipitators according to the dispersion degree and other requirements. Then it will be determined according to other conditions and the type and performance of the dust remover introduced.

The dust density also has a great influence on the performance of the dust collector, which is manifested by the gravity, inertial force and centrifugal force dust collectors. The common point of all dust collectors is that the smaller the stacking density is, the more difficult it is to separate and capture dust particles, and the more serious the secondary flying of dust is. Therefore, special measures shall be taken for operation and equipment structure.

3. Type selection according to dust concentration of gas

For gravity, inertia and cyclone dust collectors, generally speaking, the higher the inlet dust concentration is, the higher the dust removal efficiency is. However, this will increase the dust concentration at the outlet, so it is not a general idea to think that the dust removal efficiency is good only from the perspective of high dust removal efficiency. For wet dust collectors such as Venturi tube dust remover and jet scrubber, the initial dust concentration should be 10g/m3; For bag filter, the lower the dust concentration, the better the dust removal performance; When the initial concentration is relatively high, continuous ash removal is carried out, and the pressure loss and discharge concentration can also meet the environmental requirements. The initial concentration of electrostatic precipitator is 30g/m3, which can be used without pre precipitator.

4. Effect of dust adhesion on dust

The adhesion mechanism between dust and wall is closely related to the specific surface area and moisture content of dust. The smaller the particle size d, the larger the specific surface area, the more water content, and the greater the adhesion.

In cyclone dust remover, the dust adheres to the wall due to centrifugal force, which may lead to blockage. The dust adhering to the bag type dust remover is easy to block the hole of the filter bag, while the electrostatic precipitator is easy to deposit dust on the discharge electrode and the dust collector.

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