Introduction to the working principle of various dust collectors

Release time:06-10-2019
Abstract:

Multi-tube dust collector The dust-laden gas enters the […]

Multi-tube dust collector
The dust-laden gas enters the gas distribution chamber from the total intake pipe and then enters the annular space between the ceramic cyclone body and the baffle. The deflector changes the gas from a linear motion to a circular motion. The majority of the swirling airflow spirals downward from the cylinder to the cone, and the dust-containing gas generates centrifugal force during the rotation, which is greater than the density. The dust particles of the gas smash toward the wall of the cylinder. When the dust particles come into contact with the wall of the cylinder, the inertia force is lost and the momentum of the inlet velocity and the downward gravity fall down the wall toward the ash discharge port and enter the total ash hopper. When the rotating external swirling airflow reaches the lower end of the cone, the spiraling flow (purge gas) continues from the bottom to the top in the direction of the cyclone axis due to the contraction of the cone, and the ceramic cyclone exhaust pipe passes through the ceramic cyclone exhaust pipe. Enter the exhaust chamber and discharge from the total exhaust port.
Electrostatic precipitator
The electrostatic precipitator is based on the electrostatic precipitator and dust source control method, and is a new way to solve the dust removal of small scattered dust spots. It uses the exhaust pipe or the closed cover of the production equipment as the pole plate, and the discharge electrode is placed in the cover or the pipe, and the high-voltage power source is connected to form an electric field. When the dust-containing gas passes through the electric field, the dust accumulates on the cover or the pipe wall under the action of the electric field force, and the purified gas is discharged through the exhaust pipe. The cleaning is performed by manual rapping or self-weight. It is especially suitable for dispersing dust spots such as crushing, screening workshops and sintering conveyor belts, as well as dust purification of mine roadways and small boilers. Although simple electrostatic precipitators are available in a variety of styles, they are available in hood, tube and open styles.
Dust removal device
The hood type dust removing device controls the locally generated dust source point in the sealed hood, and suppresses or traps the dust by the high voltage electric field. A typical hood type dust removal device is used on process equipment for crushing, transporting and sieving raw materials, such as belt conveyors, vibrating screens, warehouse roofs, and dust spots with material drop.
Explosion-proof dust collector
Because aluminum powder explosive dust is likely to explode or burn in the presence of sparks or static electricity at a certain concentration.
Because the aluminum powder explosion, the most critical factor is the aluminum powder concentration, the most effective way to control the aluminum powder explosion is to control the concentration of aluminum powder. The tool for controlling the concentration of aluminum powder is the dust collector. As long as the working mode of the shot blasting machine is good, the dust removal effect is good, and the aluminum powder concentration of the whole shot blasting machine equipment will not rise. Therefore, ensuring the good dust removal effect of the dust removal device is the key to whether the device can operate normally. The effectiveness of the dust removal effect depends mainly on the filter material, and the dust removal effect is greatly reduced when the filter material is clogged. When the ventilation and filtration of the filter material is good, the pressure difference between the static pressure chamber and the dynamic pressure chamber of the dust collector will be stabilized within a fixed range, so controlling the pressure difference of the dust collector is the most effective way to control the working state of the dust collector. Method. Based on this point, Disha Company invented the explosion-proof dust collector. The main method is to install the differential pressure control instrument in the place where there is no vibration near the dust collector of the shot blasting machine. When the shot blasting machine is working for a period of time, the The pressure difference detected by the instrument will change. When the detected value exceeds the upper and lower limits, the differential pressure controller will control the cleaning mechanism of the filter bag of the dust collector. For example, the shock filter or the backflushing mechanism will filter the filter. The dust on the surface is removed to ensure that the dust collector has a good working condition. When automatic cleaning still does not meet the requirements, the differential pressure controller will control the alarm and control the device to automatically shut down to prevent accidents.
In order to ensure safe operation, we also installed a gravity-type automatic squib door in the key part of the shot blasting machine. The device is generally designed on the top of the blasting chamber and the dust-removing pipe, and the dust-intensive part is accurately The calculation can automatically open the door when the explosion just occurs, and the explosion pressure is released to avoid damage to equipment and personnel. The door is automatically closed by gravity after pressure relief.
The shot blasting machine adopts the bag type dust collector of FEF210 sub-chamber backflushing. The dust removal efficiency is over 99%? The exhaust gas emission is ≤90mg/m3, which conforms to the GBJ4-73 industrial “three wastes” emission standard. The main fan power is 30kw, and the dust removal bag is used. The anti-static function of the needle felt industrial filter cloth is precision-sewn, and the cloth bag can be easily removed for cleaning and reuse. Moreover, the filter bag is reliably grounded during the installation process, which can effectively avoid the possibility of aluminum powder explosion caused by static electricity.
Pulse bag filter
Since the introduction of the pulse bag type dust collector in the 1950s, it has been widely used at home and abroad, and has been continuously improved. It has made great progress in purifying dust-containing gas. Due to the advanced cleaning technology and the large increase in gas-to-cloth ratio, it has a treatment air volume. Large, small footprint, high purification efficiency, reliable work, simple structure, small maintenance and so on. Dust removal efficiency can reach more than 99%. It is a mature and relatively efficient high-efficiency dust removal equipment.