l, according to the amount of processing gas selection The amount of gas to be treated is the decisive factor determining the type of dust collector. For the amount of air, it is necessary to select a dust collector with a large amount of gas. It is often uneconomical to use multiple dust collectors for parallel operation. It is more economical and the easiest to meet the environmental requirements of dust source control and dust emission. Since the dust collector enters the actual operation, it is sometimes difficult to predict due to the operation 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. According to the dispersion and density of dust Dust dispersion has a great influence on the performance of the precipitator, and the dispersion of the dust is the same, and there are also differences due to different operating conditions. Therefore, when selecting the type of the precipitator, the first thing is to know the dispersion of the dust. For example, if the particle size is more than 10υm, the cyclone can be selected. When the particle size is more than a few micrometers, the electrostatic precipitator and the bag filter should be selected. The specific selection can be based on the dispersity and other requirements, and the preliminary selection of the common dust collector type and performance table can be made; then according to other conditions and introduction The type and performance of the precipitator are determined. The dust density also has a great influence on the dust removal performance of the dust collector. The most obvious manifestations of this effect are gravity, inertial forces and centrifugal dust collectors. A common feature of all dust collectors is that the smaller the bulk density, the more difficult it is to separate and trap dust particles, and the more severe the secondary flight of dust, so special measures should be taken in terms of operation and equipment structure. 3, according to the gas dust concentration selection For Zhang Li, inertia and cyclone. Generally speaking, the greater the concentration of dust in the inlet, the higher the dust removal efficiency, but this will increase the concentration of dust in the outlet. Therefore, it is not considered that the dust treatment effect is good only from the high dust removal efficiency, and the venturi dust collector and spray For wet scrubbers such as scrubbers, the initial dust concentration is preferably below 10g/m; for bag filter, the lower the dust concentration, the better the performance in the middle, at higher initial concentrations. Continuous 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 pre-empting the dust collector. 4, the impact of dust adhesion on the selection The adhesion mechanism of dust and wall has a great relationship with the specific surface area and moisture content of dust. The smaller the dust particle size d is, the larger the specific surface area is, and the more the water content is, the more the adhesion is. In the cyclone dust collector, the dust adheres to the wall due to the centrifugal force, and there is a danger of clogging; and the dust adhered to the bag filter is easy to block the pores of the filter bag, and the electrode is easy to be placed on the electrode and the dust collector. Dust. 5, the impact of dust specific resistance on the selection The dust specific resistance of the electrostatic precipitator should be within the range of 104 to 10 nΩ ̇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 the highest between 100 and 200 °C; if the dust-containing gas is sulphur-regulated, the specific resistance is lower. Therefore, when selecting an electrostatic precipitator, it is necessary to know the specific resistance of the dust in advance, and fully consider the choice of the temperature of the dust-containing gas and the adjustment of the nature of the dust-containing gas. 6. Influence of temperature of dusty gas on selection In principle, dry scrubbers must be carried out at temperatures above the dew point of the dust-containing gas. In wet scrubbers, treatment should be carried out at low temperatures as much as possible due to evaporation of water and condensation after discharge to the atmosphere. In the filter cartridge dust collector, the temperature at which the dust-containing gas is directly or indirectly treated should be lowered below the heat-resistant temperature of the filter cloth. The glass fiber filter cloth is generally used at temperatures below 260 °C. Other filter cloths are between 80 and 200 °C. In the electrostatic precipitator, the use temperature can reach 400 °C. The temperature of the dust-containing gas should be selected in consideration of the specific resistance of the dust and the thermal expansion of the structure of the precipitator. 7. Precautions for selecting wet dust collector Most of the wet scrubbers use water. If the dust source equipment is small in scale, it is necessary to remove harmful gases at the same time, or it is necessary to completely collect dust such as extremely fine carbon black and lead dust, and a wet dust collector is often used. The use of wet scrubbers should consider wastewater treatment to prevent secondary pollution. In addition, in order to effectively use the dust collector, it should be handled according to the situation. When treating flue gas containing carbon monoxide, measures should be taken to prevent explosion, such as introducing air into the high temperature part of the flue of the furnace exit to oxidize carbon monoxide to carbon dioxide.
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Choose the seven elements of the dust collector
The selection of the precipitator should consider a variety of factors and conditions. The following are the most important issues.