|Industrial dust treatment equipment series|
|Welding fume exhaust gas treatment series|
|Grinding polishing dust removal equipment|
|Stand-alone dust collector|
|Spiral duct and accessories series|
How to choose dust removal equipment? Aspects of dust removal equipment selection:
The method of selecting the dust removal equipment should consider various factors and conditions. In general, the following principles can be followed.
How to choose dust removal equipment? What parts does a dust removal system usually consist of?
The dust removal system mainly includes air hood, air inlet pipe, dust collector, exhaust pipe, fan, motor, ash unloading device, dust removal recovery system and auxiliary facilities. Its working principle is to use the power generated by the fan to send dust-containing gas to the dust removal device for purification through the exhaust pipe. The purified gas is discharged from the chimney through the exhaust pipe, and the collected dust is discharged from the exhaust device. Power supply equipment, other equipment is supporting facilities.
The amount of processing gas is the decisive factor in determining the size and type of dust removal equipment. When the gas volume is large, you must choose a dust removal equipment that can handle the amount of air. It is generally uneconomical to use multiple dust removal equipment that processes a small amount of air in parallel. Which type of dust removal equipment It is the most economical to use in the case of small air volume, and it is the easiest to meet the requirements of dust source point control and dust emission environmental protection.
After the dust removal equipment enters actual operation, it is sometimes difficult to predict the impact of 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 capacity.
The degree of dust dispersion selected according to the degree of dust dispersion and density has a great impact on the performance of the vacuum cleaner. Therefore, when selecting the type of dust collector, you must first grasp the degree of dust dispersion. If the particle size is greater than 1011, you can choose a cyclone dust collector. The particle size is mainly? !!! The following uses electrostatic precipitator and bag precipitator. When the dust dispersibility is the same, select according to other requirements. The initial selection generally refers to the type and performance table of common dust collectors. Then it is determined according to the types and performance of other strips and ordinary dust collectors.
Dust concentration also has a great impact on the dust removal performance of the dust collector, especially gravity dust collector, inertial dust collector and centrifugal dust collector. A common feature of all vacuum cleaners is that the smaller the bulk density, the more difficult it is to separate and collect dust particles, and the more serious the secondary flying of dust. Therefore, special measures should be taken in operation and equipment structure.
Generally speaking, gravity, inertia and cyclone dust collectors have high dust concentration at the inlet. Although the dust removal efficiency is high, the dust concentration at the outlet does not meet the requirements. Therefore, the dust removal effect cannot be judged based on the dust removal efficiency alone. For wet scrubbers such as Venturi scrubbers and jet scrubbers, the initial dust concentration should be lower than 108 / claw 3. The lower the dust concentration of the bag filter, the better the dust removal effect. When the initial concentration is higher, continuous Ash removal, pressure loss and emission concentration can also meet environmental protection requirements. When the initial concentration of dust-containing gas entering the electrostatic precipitator is lower than 308/013, it can be used directly without a pre-dust collector.
How to choose dust removal equipment? Influence of dust adhesion on selection
The adhesion mechanism of dust to the wall is closely related to the specific surface area and moisture content of the dust.
The smaller the dust particle size, the larger the specific surface area, the larger the water content, and the stronger the adhesion.
In cyclone dust removal equipment, dust adheres to the wall due to centrifugal force, and there is a danger of clogging. For bag dust collectors, the adhered dust easily blocks the pores of the filter bag.
For electrostatic precipitators, large dust adherence makes it easy for the discharge electrode and dust collector to accumulate dust.
How to choose dust removal equipment? Influence of dust specific resistance on selection
The specific resistance of dust varies greatly with the temperature and humidity of the dust-containing gas. The specific resistance of dust is 100? The resistivity value is the largest in 2001. If the dust-containing gas is conditioned with pork, the specific resistance will decrease. The electrostatic precipitator requires a specific dust resistance of 104 ?. Therefore, when choosing an electrostatic precipitator, still in this range, you need to know the resistivity of powder 12 in advance, and fully consider the choice of the temperature of the dust-containing gas and the combination of the performance of the dust-containing gas.
How to choose dust removal equipment? Effect of dusty gas temperature on selection
In principle, the feed temperature of the dry dedusting equipment must be higher than the dew point of the dusty gas.
In wet dust collectors, due to the evaporation of water and the condensation after discharge to the atmosphere, they should be treated at the lowest possible temperature. In the filter dust collector, the temperature of the dust-containing gas directly or indirectly handled by him should be lower than the heat-resistant temperature of the filter cloth. The use temperature of the glass fiber filter is generally lower than 2501. Another filter cloth is 80? 2001 . In electrostatic precipitators, the operating temperature can reach 4001 ° C. At the same time, the temperature selection and treatment of dust-containing gas should take into account the thermal expansion of dust-specific electrical muscles and the structure of the dust collector.
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