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How to choose a dust collector

Source: Official website   |   Date:2017-08-01

l. Selection based on gas processing volume
The amount of gas processed is the decisive factor in determining the size and type of dust collector. For large gas volumes, it is necessary to choose a dust collector that can handle large gas volumes. If multiple dust collectors that handle small gas volumes are used in parallel, it is often uneconomical; Which type of dust collector should be used more economically and easily to meet the environmental requirements of dust source control and dust emissions for smaller gas volumes.
Due to the unpredictable impact of operation and environmental conditions on the actual operation of the dust collector, it is necessary to ensure a certain margin or reserve some space that may increase the equipment capacity when determining the equipment capacity.
2. Selection based on dust dispersion and density
The dispersion of dust has a significant impact on the performance of dust collectors, and the same dispersion of dust can also vary due to different operating conditions. Therefore, when choosing the type of dust collector, the first thing is to accurately grasp the dispersion of dust, such as choosing a cyclone dust collector when the particle size is more than 10 μ m. If the particle size is mostly several micrometers or less, electrostatic precipitators and bag filters should be selected. The specific selection can be based on dispersion and other requirements, referring to the commonly used dust collector types and performance table for preliminary selection; Then determine the type and performance of the dust collector according to other conditions and the introduction.
The dust density also has a significant impact on the dust removal performance of the dust collector. This impact is evident in the dust collectors with gravity, inertial force, and centrifugal force. A common feature of all dust collectors is that the lower the stacking density, the more difficult it is to separate and capture dust particles, and the more severe the secondary dust flying. Therefore, special measures should be taken in operation and equipment structure.
3. Selection based on gas dust concentration
For Zhangli, inertia, and cyclone dust collectors. Generally speaking, the higher the concentration of imported dust, the higher the dust removal efficiency. However, this will increase the dust concentration at the outlet. Therefore, it is not appropriate to assume that the dust treatment effect is good simply based on the high dust removal efficiency. For wet dust collectors such as Venturi scrubbers and jet scrubbers, it is advisable to have an initial dust concentration below 10g/m; For bag filters, the lower the dust concentration, the better the removal efficiency, especially at higher initial concentrations. Continuous ash cleaning, pressure loss, and emission concentration can also meet environmental requirements. The initial concentration of the electrostatic precipitator is below 30g/m3, and it can be used without a pre dust removal device.
4. The influence of dust adhesion on selection
The adhesion mechanism between dust and walls is closely related to the specific surface area and moisture content of dust. The smaller the dust particle size d, the larger the specific surface area, the more water content, and the greater its adhesion.
In a cyclone dust collector, dust adheres to the wall due to centrifugal force, which poses a risk of blockage; The dust adhered to the bag filter is prone to clogging the pores of the filter bag, while the dust on the discharge electrode and dust collector of the electrostatic precipitator is prone to dust accumulation.
5. The influence of dust specific resistance on selection
The dust specific resistance of the electrostatic precipitator should be between 104 and 10n Ω· Within a range of cm. The specific resistance of dust varies greatly with the temperature and humidity of the dusty gas. For the same type of dust, the specific resistance value is higher between 100 and 200 ℃; If dust containing gas is quenched and tempered with sulfur, the specific resistance will decrease. Therefore, when selecting an electrostatic precipitator, it is necessary to grasp the specific resistance of the dust in advance, fully consider the selection of the temperature of the dusty gas and the adjustment of the properties of the dusty gas.

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