Seven elements for choosing an industrial dust collector
In industrial production, the ventilation and dust removal project is an indispensable part of it, and the dust collector is the main equipment in the ventilation and dust removal project, and it is one of the important technical measures to control the dust, harmful gas or steam in the workshop, so when choosing industrial A variety of factors and conditions must be considered when precipitating.
Industrial dust collector
l. Selection according to the amount of processed gas
The amount of gas to be processed is a decisive factor in determining the size and type of the dust collector. For the air volume, a dust collector that can handle a large amount of air must be selected. It is often uneconomical to use multiple dust collectors that handle small amounts in parallel. It is more economical to compare which type of dust collector with a small air volume, and it is easier to meet the environmental protection requirements of dust source control and dust emission.
After the dust collector enters the actual operation, it is sometimes not easy to predict that it will be affected by operating and environmental conditions. Therefore, when determining the capacity of the equipment, it is necessary to ensure a certain margin or reserve some space that may increase the equipment.
2. Selection according to the dispersion and density of dust
The degree of dust dispersion has a great influence on the performance of the dust collector, and the degree of dust dispersion is the same, and there are differences due to different operating conditions. Therefore, when selecting the type of dust collector, the most important thing is to accurately grasp the degree of dust dispersion. For example, when the particle size is more than 10 υm, the cyclone dust collector can be selected. When the particle size is mostly below a few microns, electrostatic precipitator and bag filter should be used, and the specific selection can be based on dispersion and other requirements, refer to the type and performance table of commonly used precipitators for preliminary selection; and then according to other conditions and introduction The type and performance of the dust collector are determined.
The dust density also has a great influence on the dust removal performance of the dust collector. This effect is more obvious in the gravity, inertial force and centrifugal force dust collector. One common point of all dust collectors is that the smaller the bulk density, the more difficult it is to separate and capture the dust particles, and the more serious the secondary flying of dust, so special measures should be taken in operation and equipment structure.
3. Selection according to gas dust concentration
For Zhang Li, inertia and cyclone dust collectors. Generally speaking, the greater the dust concentration at the inlet, the higher the dust removal efficiency. However, this will increase the dust concentration at the outlet. Therefore, it cannot be considered that the dust treatment effect is good only from the high dust removal efficiency. For wet dust collectors such as scrubbers, the initial dust concentration should be less than 10g/m; for bag dust collectors, the lower the dust concentration, the better the removal performance, at a higher initial concentration. Continuous cleaning, pressure loss and emission concentration can also meet environmental protection requirements. The initial concentration of the electrostatic precipitator is below 30g/m3, and it can be used without a pre-cleaner.
4. The influence of dust adhesion on the selection
The adhesion mechanism between the dust and the wall is closely related to the specific surface area and moisture content of the dust. The smaller the dust particle size d, the greater the specific surface area, the greater the water content and the greater the adhesion.
In the cyclone dust collector, the dust adheres to the wall surface due to centrifugal force, and there is a danger of clogging; while the dust adhered to the bag filter is easy to block the pores of the filter bag, and it is easy to cause the discharge electrode and dust collector Dust.
5. The influence of dust resistance on selection
The dust specific resistance of the electrostatic precipitator should be in the range of 104～10nΩ˙cm. The specific resistance of dust varies greatly with the temperature and humidity of the dust-containing gas. For the same kind of dust, the specific resistance value is between 100 and 200 ℃; if the 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, and fully consider the selection of the temperature of the dust-containing gas and the adjustment of the nature of the dust-containing gas.
6. The influence of dusty gas temperature on selection
In principle, dry dust collectors are operated at a temperature above the dew point of the dust-containing gas. In the wet dust collector, due to the evaporation of water and condensation after being discharged into the atmosphere, the treatment should be carried out at a low temperature as much as possible. In the filter cartridge dust collector, the temperature of directly or indirectly treating the dust-containing gas should be lowered to below the heat-resistant temperature of the filter cloth. The service temperature of glass fiber filter cloth is generally below 260°C. Other filter cloths are between 80 and 200°C. In the electrostatic precipitator, the operating temperature can reach 400℃. The specific resistance of the dust and the thermal expansion of the precipitator structure should be considered to select the temperature of the dust-containing gas.
7. Precautions for selecting wet dust collector
Most wet dust collectors use water. If the scale of the dust source equipment is small and harmful gases need to be removed at the same time, or when extremely fine carbon black, lead dust and other dust need to be completely captured, wet dust collectors are often used. Sewage treatment should be considered when selecting a wet dust collector to prevent secondary pollution.
In addition, in order to effectively use the dust collector, it should be handled according to the situation. When handling the flue gas containing carbon monoxide, measures should be taken to prevent explosion, such as introducing air into the high temperature part of the flue at the outlet of the generator to oxidize the carbon monoxide to carbon dioxide.
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