1. Bag filter:
The working principle of the dust collector is as follows: the dust-laden gas enters the filter room through the open flange at the lower part, and the coarser particles directly fall into the dust bin. The dust-laden gas is filtered by the filter bag, the dust is retained on the bag table, and the net gas passes through the bag mouth. The clean room is vented to the atmosphere by a fan. When the dust on the surface of the filter bag continues to increase, the programmable controller starts to work, and the pulse valve is opened one by one so that the compressed air blows and clears the filter bag through the spout, so that the filter bag suddenly expands, and the bag is given under the effect of the reverse airflow. The dust rapidly falls out of the filter bag and falls into the ash bin, and the dust is discharged from the ash discharge valve.
The dust collector is mainly composed of an upper box body, a middle box body, a ash bucket, an inlet air flow equalizing tube, a support filter bag, an injection device, and an ash discharge device. Dust-laden gas enters the ash hoppers of each sub-chamber from the air inlet flow-distributing pipe of the dust collector, and under the diversion of the ash hopper diversion device, the large-particle dust is separated and directly falls into the ash hopper, and fine dust enters evenly. The middle box is adsorbed on the outer surface of the filter bag, clean gas passes through the filter bag into the upper box, and is discharged into the atmosphere through the off-line valves and the exhaust pipe. As the filtering conditions progress, the dust on the filter bag builds up more and more. When the resistance of the device reaches the limited resistance value (usually set to 1500Pa), the set value or cleaning time of the differential pressure is set by the cleaning control device. After the set value is automatically shut off the off-line valve in one chamber, the electronically controlled pulse valve is opened according to the setting procedure to stop the air blow and the pressure in the filter bag is increased by the instant injection of compressed air, and the dust on the filter bag is shaken off. (Even fine dust can be cleaned thoroughly) In the ash bucket, it is discharged by the ash discharge mechanism.
2. Cyclone dust collector:
After the cyclone is bypassed, its working principle is that the dust-laden gas enters from the inlet into the tangential direction. At the same time when the air flow obtains the rotary motion, the air flow is separated from the upper and lower sides to form a double spiral vortex motion. The dust generates strong turbulence at the boundary of the twin spiral vortex. The separation of the coarse dust particles with the down spiral vortex air flow to the outer wall, part of the dust from the bypass hole in the middle of the separation chamber, the remaining dust from the downward flow of people ash bucket. The upper vortex air flow has aggregating effect on fine-grained dust, thereby improving dust removal efficiency. This part of the finer dust particles, from the upper spiral vortex to the upper part, forms a strong rotating upper dust ring under the top cover, and enters the upper hole of the bypass separation chamber together with the upper spiral worm gas flow, and is introduced into the cone through the return air inlet. With the internal air flow, the purified gas is discharged from the exhaust pipe, and the separated dust enters the hopper.
After the dust-laden gas enters the equipment from the air inlet at the top of the equipment, it passes through the cyclone separator at a high speed to rotate the dust-laden gas downwards along the axis adjustment spiral. The centrifugal force removes dust from the coarser particles and effectively controls the initial entry of the electric field. Dust concentration. Then, the gas enters the electric field through the lower ash hopper. Because the cross-sectional area of the lower ash bucket is greater than the number of times the inner tube is multiplied, the radial wind speed and axial wind speed are rapidly reduced to produce a zero-speed interface and the inner tube The heavy particulate dust settles in the lower ash hopper, which reduces the concentration of dust entering the electric field. The low concentration of dust-laden gas is condensed on the cathode and anode plates by electric dust collection, and the collected dust is discharged from the lock air by raking. The ash device is transported away. In order to prevent the secondary dust formed in the lower hopper after the cyclones of the inner tube and the electric field plate are shaken, an isolation cone is provided in the lower ash hopper. Use range of cement, fertilizers, and other industries, a variety of mills, crushing point feed port, packaging machine and dryer and a variety of similar sources of dispersion.
3. Cartridge dust collector:
Under the action of the main fan of the system, the dust-containing gas enters the air box at the bottom of the precipitator from the air inlet at the bottom of the precipitator to pretreat the dust-containing gas, and then enters into the dust-collecting chambers of the upper tank from the bottom; the dust is adsorbed. On the outer surface of the filter cartridge, the filtered clean gas passes through the filter chamber and enters the clean air chamber of the upper cabinet and is collected at the air outlet.
As the filtration conditions continue, the dust accumulating on the outer surface of the filter cartridge will accumulate more and more, which will increase the operating resistance of the equipment. In order to ensure the normal operation of the system, the upper limit of the dust collector resistance should be maintained in the range of 1400 to 1600 Pa. Internally, when this limit is exceeded, the PLC pulse automatic controller shall issue a command through a fixed resistance or timing to perform three-state cleaning.
The dust removal process of the filter cartridge dust collector is to cut off the net gas outlet passage of a certain chamber first, so that the chamber is in a stationary state of the air flow, and then the compressed air is pulsed and blow cleaned to clear the dust, and then cleaned for several seconds. After natural settlement, open the net gas outlet passage of the chamber, not only clearing the dust completely, but also avoiding the secondary adsorption of dust generated by the spray cleaning, so that the dust is removed from the chamber.
4. Multi-pipe dust collector:
Dust-laden gas enters the gas distribution chamber from the main intake pipe and then enters the annular space between the ceramic cyclone body and the deflector. The baffles cause the gas to change from rectilinear motion to circular motion. The majority of the swirling air flow spirals downward from the cylinder body along the cyclone body and flows toward the cone. The dust-laden gas generates centrifugal force during the rotation and the density is greater than Dust particles of gas are thrown toward the wall of the cylinder. When the dust particles contact with the wall of the cylinder, they lose their inertial force and the momentum of the entrance velocity and the downward gravitational force fall along the wall surface into the dust ash outlet to enter the total ash hopper. When the swirling descending outer swirling airflow reaches the lower end of the cone, the spiral flow (clean gas) continues from the bottom to the top in the direction of the axis of the cyclone tube due to the contraction of the cone, passing through the ceramic cyclone body exhaust pipe. Into the exhaust chamber, exhausted by the total exhaust.
5. Electrostatic precipitator:
The electrostatic precipitator is based on the electrostatic precipitator and dust source control method, and it is a new way to solve the small dispersed dust point dust removal. It uses the exhaust pipe or the airtight cover of the production equipment as the electrode plate. The discharge electrode is placed inside the cover or tube, and the high voltage power supply is connected to form the electric field. When the dust-laden gas passes through the electric field, the dust collects 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. Ashes are shaken off by hand or dropped off. Particularly suitable for crushing, screening workshops and sintering conveyor belts, such as scattered dust points and mine roadway, small boiler dust purification. Although simple electrostatic precipitators are available in many forms, they can be summed up in three types: hood type, tube type, and open type.
Dust removal device:
The hood type dust removal device controls the locally generated dust source point within the airtight hood and suppresses or traps the dust by the high voltage electric field. Typical hood type dust collectors are used in the process equipment for crushing, transporting and screening of raw materials, such as belt conveyors, vibrating screens, bin tops, and dusting points where the material level drops.
Explosion-proof dust collector
Because the explosive dust of aluminum powder is in a certain concentration, it is likely to explode or burn under the condition of sparks or static electricity. Because aluminum powder explosion, the most critical factor is the concentration of aluminum powder, the most effective way to control the explosion of aluminum powder is to control the concentration of aluminum powder. The tool for controlling the concentration of aluminum powder is a dust collector. As long as the shot blaster dust collector works well and the dust removal effect is good, the aluminum powder concentration of the shot blasting cleaning machine equipment will not increase. Therefore, it is the key to ensure the normal operation of the equipment by guaranteeing a good dust removal effect. The advantages and disadvantages of the dust removal effect mainly depend on the filter material, and the dust removal effect will be greatly reduced when the filter material is clogged. When the ventilation and filtration of the filter material are in good condition, the pressure difference between the static pressure chamber and the dynamic pressure chamber of the dust collector will be stabilized within a fixed range. Therefore, controlling the pressure difference of the dust collector is the most effective way to control the working status of the dust collector. Method. Based on this, Disa company invented the explosion-proof dust collector. The main method is to install the pressure difference controller at the place where there is no vibration near the shot blasting machine dust collector. When the shot blasting machine dust collector is working for a period of time, it should be blocked. The differential pressure value detected by the instrument will change. When the detection value exceeds the set upper and lower limit, the pressure difference controller will control the cleaning mechanism of the filter bag of the dust collector, such as the shock or back blowing mechanism to filter the filter material. The dust on the surface is removed to ensure that the dust collector has a good working condition. When the automatic cleaning still cannot meet the requirements, the differential pressure controller will control the alarm and control the equipment to automatically shut down to prevent accidents.
In order to ensure safe operation, we also installed a gravity-type automatic diapir blasting door in key parts of the shot blasting dust collector. This device is generally designed on the top of the blasting chamber body and the dust removal pipeline, where the dust is dense, and the device has passed precision. The calculation can open the door automatically when the explosion just happened, and the explosion pressure is vented to avoid the equipment and personnel injury. After decompression, the door automatically closed by gravity.
The shot blasting machine adopts a bag type dust collector with FEF210 chamber back blowing. The dust removal efficiency is more than 99%. The exhaust emission is less than or equal to 90mg/m3. It conforms to the GBJ4-73 industrial “three wastes” emission standard. The main fan power is 30kw, and the dust bag is used. The antistatic function of the needle-punched felt industrial filter cloth is precisely made by sewing, and the cloth bag can be easily removed for cleaning and reuse. And the filter bag is reliably grounded during the installation process, which can effectively avoid the possibility of explosion of aluminum powder due to static electricity.
6. Pulse bag filter:
Pulse bag filter has been widely used at home and abroad since it was introduced in the 50s, and has been continuously improved. It has made great progress in purifying dust-laden gas. Due to advanced ash cleaning technology, the ratio of gas to cloth is greatly increased, so it has a processing 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, relatively complete and efficient dust removal equipment.
Features
1. The dust collector adopts the air-shut pulse-discharge cleaning technology of the sub-chamber and overcomes the shortcomings of the conventional pulse dust collector and the sub-chamber anti-blow dust collector. It has strong dust-removing capability, high dust-removing efficiency, low emission concentration, low air leakage, and energy consumption. Less, less steel consumption, less floor space, stable and reliable operation, and good economic returns. It is applicable to the purification of dust gas and recovery of materials in metallurgy, building materials, cement, machinery, chemical industry, electric power and light industry.
2. As a result of the use of air-separation wind-down pulses to clean the ash and spray once to achieve the goal of complete cleaning, the dedusting cycle is prolonged, the energy consumption of cleaning is reduced, and the pressure consumption can be greatly reduced. At the same time, the degree of fatigue of the filter bag and the pulse valve is also reduced, thereby multiplying the life of the filter bag and the valve plate.
3, maintenance and replacement bags can be kept in the system fan, the system under normal operating conditions under the room. Bag bag mouth adopts elastic ringing, good sealing performance, firm and reliable. The filter bag keel adopts a polygonal shape, which reduces the friction between the bag and the keel, prolongs the life of the bag, and facilitates unloading of the bag.
4, the use of the upper pumping method, after the replacement of the skeleton bag, the dirty bag into the lower hopper of the box, removed from the manhole to improve the bag replacement operating conditions.
5, the use of airtight box design, good sealing, check the door with good sealing material, the production process to detect leaks with kerosene, air leakage rate is very low.
6. The inlet and outlet air ducts are compactly arranged and the airflow resistance is small.