Common problems & treatment measures of ball mill
In the course of using the ball mill, various problems will inevitably occur, and there are different treatment measures for different problems.
1. When the ball mill is running, there is a regular beating sound, and the sound is loud. This is because part of the liner bolts are not tightened. When the ball mill rotates, the liner hits the barrel of the ball mill. Judge the position of the liner of the ball mill according to the sound, find out the loose bolts, and tighten them separately.
2. The temperature of the bearings of the ball mill and the motor has risen, exceeding the regulations. Try to check whether the temperature of the bearing part or all of it is too high by hand. Check and deal with the ball mill from the following points.
(1) Check the lubrication points of each part of the ball mill, and whether the type of lubricating oil used is consistent with the factory manual of the equipment.
(2) Check whether the lubricating oil and grease of the ball mill have deteriorated.
(3) Check whether the lubrication pipeline of the ball mill is blocked, or the lubricating oil does not directly enter the lubrication point, and the insufficient amount of oil causes heat.
(4) The side clearance of the bearing bush of the ball mill is too small, the clearance between the bearing bush and the shaft is too large, and there are too many contact points, which can not form a uniform oil film on the bearing bush.
(5) There is too much or too little grease in the rolling bearing of the ball mill. Too much forms the rolling elements and agitates the grease to generate heat, and the heat is not easy to dissipate. If the lubrication is too little, the oil should be added enough according to the regulations, generally 1/3~1/2 of the bearing gap is more appropriate.
(6) The sealing device of the hollow shaft at both ends of the ball mill body is too tight, or the iron part of the sealing body is in direct contact with the shaft.
The above-mentioned problems shall be dealt with according to their reasons. If the side clearance of the bearing bush is too small, or the contact angle at the bottom is too large, the grinding cylinder must be jacked up with an oil hydraulic jack, the bearing bush must be pulled out from one side of the shaft, and the tile opening must be scratched separately.
3. Heating of ball mill reducer bearing:
In addition to checking the bearing temperature rise of the ball mill, check whether the vent hole of the reducer is blocked, and unblock the vent hole.
4. After the ball mill motor with reducer is started, the vibration occurs, the main reasons are:
(1) The gap between the two wheels of the ball mill coupling is too small to compensate for the amount of movement caused by the self-finding magnetic center when the motor is started.
(2) The method of aligning the coupling of the ball mill is incorrect, causing the two shafts to be misaligned.
(3) The connecting bolts of the ball mill coupling are not tightened symmetrically, and the degree of tightening force is different.
(4) The outer ring of the ball mill bearing moves.
Treatment method: Adjust the gap according to the regulation to make the two shafts concentric. Tighten the coupling bolts of the coupling symmetrically with the same torque. When the rotor is unbalanced, take out the rotor of the ball mill to find a static balance.
5. When the ball mill reducer drives the mill, huge vibration occurs:
(1) The balance shaft of the ball mill and the reducer, the shaft center is not in a straight line, the reason is:
When the mill was installed with the liner, the secondary grouting was not carried out, or the anchor bolts after the secondary grouting were not fastened properly, the mill cylinder was rotated by the hoist, which caused one end of the mill cylinder to shift, and the two shaft centers were not in line. Vibration occurs after the reducer drives the mill.
Treatment method: re-adjust so that the axis of the ball mill mill and the axis of the reducer are on the same plane axis.
(2) The large-scale ball mill is large in size and heavy, which causes the foundation to sink; displacement occurs. Set up monitoring settlement points next to the foundation; make observations and make adjustments if there is sinking.
6. The running sound of the reducer of the ball mill is abnormal:
The sound of the normal operation of the ball mill reducer should be uniform and stable. If the gear has a slight knocking sound, a hoarse friction sound, and there is no obvious change during operation, you can continue to observe, find out the cause, and stop the ball mill for treatment. If the sound is getting louder, stop the ball mill for inspection immediately.
Maintenance of ultra-fine grinder
The maintenance of the ultra-fine grinding machine is an extremely important and frequent work, and it is closely coordinated with the operation and maintenance, and it should be checked by a full-time staff.
The ultra-fine grinder is an equipment that uses air separation, heavy pressure grinding, and shearing to achieve ultra-fine grinding of dry materials. Let's take a look at the maintenance of the ultra-fine grinder:
1. The shaft bears the full load of the negative machine, so good lubrication has a great relationship with the life of the bearing, it directly affects the life and operation rate of the machine, so the injected lubricating oil must be clean and well sealed. The main oil injection points of the machine include: rotating bearings, roll bearings, all gears, movable bearings, and sliding planes.
2. The newly installed wheel tyres are prone to looseness and must be checked frequently.
3. Pay attention to whether all parts of the machine work normally.
4. Pay attention to check the degree of wear of easily worn parts, and pay attention to replacing worn parts at any time.
5. The plane of the bottom frame of the movable device should be cleaned of dust, so as to prevent the movable bearing from moving on the bottom frame when the machine encounters unbreakable materials, which may cause serious accidents.
6. If the bearing oil temperature rises, stop the machine immediately to check the cause and eliminate it.
7. When the rotating gear is running, if there is an impact sound, stop and check it immediately and eliminate it.
Ultra-fine grinding technology is a technology that has been developed and widely used in recent decades. At the same time, the ultra-fine grinder industry has also been rapidly developed, especially in the pharmaceutical industry, and has been more widely used. The future development prospects are promising. It has been successfully applied to many industries such as chemical industry, medicine, machinery and so on. Especially the ultra-fine grinding products produced by the vibration method have the advantages of fine grinding particle size, fully enclosed production process, no pollution, and no loss of nutrients. The ultra-fine grinding machine is all made of high-quality stainless steel to avoid the entry of other impurities; the structure of the whole machine is smooth, the material is crushed and collected sufficiently, and the loss is reduced; the grinding wheel and rail are made of special super-hard stainless steel, which is not easy to wear and has a long service life, thereby reducing the cost.
Common troubleshooting of ultra-fine grinder
Ultra-fine grinders can be divided into dry grinding and wet grinding. According to the different principles of the grinding force generated during the grinding process, dry grinding has airflow, high-frequency vibration, rotating ball (rod) grinding, hammering and self-grinding, etc.; wet grinding mainly uses colloidal grinding and Homogenizer to complete.
The host system of the ultra-fine grinder is composed of an air compressor, an air purifier system, a supersonic jet mill, a classifier, and a cyclone separator. Medium and small fluidized bed type airflow ultra-fine grinders usually combine supersonic jet mills, classifiers and cyclones into an integrated machine, which can greatly save floor space and facilitate installation, transportation and use.
Elimination of common faults of ultra-fine grinder:
1. Reverse injection at the feed inlet: improper adjustment of the air door, blockage of the conveying pipe, clogged sieve, too short powder collection bag or poor air permeability, serious wear on the edge of the hammer, etc. will cause the reverse injection at the feed inlet. When this phenomenon occurs, you should first find out the cause, and then take targeted elimination measures, or adjust the air door to clear the blockage, or exchange the powder bag to increase the air permeability, or replace the hammer.
2. Bearing overheating: When the bearing is poorly lubricated, damaged, or the main shaft is bent, the rotor is severely unbalanced, and the belt is too tight, the bearing will overheat. The bearings can be restored to normal conditions by adding or replacing lubricating oil, replacing bearings, spindles, balancing rotors, and adjusting belt tightness.
3. The grindervibrates strongly:
① If the hammers are installed incorrectly, they should be rearranged according to the requirements of the manual;
② The weight deviation of the corresponding two sets of hammers is too large, and their weight should be balanced so that the weight difference does not exceed 5 grams;
③If the bearing is damaged or the main shaft is bent, it should be replaced in time;
④ The foot connecting screws are loose and should be tightened.
4. There is abnormal sound in the grinder: the parts in the grinder are damaged or falling off, or if hard objects such as rocks or iron enter the machine, abnormal sound will be generated. Stop the machine for inspection immediately, replace the damaged parts and remove the hard objects.
5. Low production efficiency: Insufficient motor power, improper belt pulley preparation, belt slippage, severe hammer wear, uneven feeding or excessive water content of raw materials are the main reasons for low production efficiency. When the above situation occurs, corresponding measures can be taken to solve the problem, or the motor or belt pulley can be replaced to increase the speed, but the rated operating speed should not be exceeded; or the belt tightness can be adjusted, or the belt should be replaced, or the hammer can be replaced. During operation, the feed should be uniform, and a small amount should be fed quickly to maintain continuous and uniformity; the over-wet raw materials should be dried before grinding.
Installation precautions of air classifier
1. Perform a preliminary inspection of the classifier, fan and other host equipment. Whether there is any damage to the components during transportation or after long-term storage, check whether there is any foreign matter in the internal cavity of the equipment and the air duct of the fan, rotate the grading impeller and the main shaft of the fan, and observe whether Flexible rotation.
2. Check the tightness of the pre-installed parts of the equipment, and add lubricating oil to the parts that need to be lubricated.
3. Install the grading wheel to prevent collision. The grading main engine and fan should be level tested, and the level should be found with gaskets, and those with basic requirements should be fixed with the foundation.
4. Sealing gaskets should be equipped for the pipeline interfaces that require sealing.
5. After the classifier is installed, observe the running direction of the classifying motor first.
6. When installing and wiring the electric control cabinet, carefully check the corresponding relationship between the serial number of the wiring terminal and the equipment, and it should not be misplaced.
7. After installation, you can run the vehicle empty for 1-2 hours, tighten the loose bolts at any time, and carefully check the accuracy and coordination of the equipment actions.
Correct use method of ultra-fine grinder
1. The ultra-finegrinderand power unit should be installed firmly. If the ultra-fine grinder is fixed for long-term operation, it should be fixed on the cement foundation; if the grinder is mobile operation, the unit should be installed on a base made of angle iron, and the power machine (diesel engine or electric motor) and the grinder should be ensured The pulley grooves are in the same plane of rotation.
2. After the grinder is installed, check the fastening of each part of the fasteners, and tighten them if they are loose. At the same time, check whether the belt tightness is appropriate.
3. Before starting the grinding machine, turn the rotor by hand to check whether the claws, hammers and the rotor are running flexibly and reliably, whether there is any collision in the shell, and whether the rotation direction of the rotor is consistent with the direction of the machine arrow, power machine and grinding Whether the machine lubrication is good.
4. Don't change the belt pulley casually, in case the speed is too high to cause explosion in the grinding chamber, or the speed is too low to affect the working efficiency of the grinder.
5. After starting the grinding machine, it should be idling for 2~3min, and then feeding work after there is no abnormal phenomenon.
6. Pay attention to the operation of the grinder at all times during work, and feed evenly to prevent blocking the car, and do not overwork for a long time. If there are vibrations, noises, excessive temperature of the bearings and the machine body, or spraying materials, the machine should be shut down immediately for inspection, and the work should continue after troubleshooting.
Maintenance measures for the ultra-fine grinder, the machine must be cleaned up after the end of daily work. Fill the oil nozzle with lubricating oil at any time to protect the normal operation of the bearing and prolong the service life of the bearing. After working for 1000 hours, the bearing must be cleaned and replaced with calcium-based lubricant to half full to ensure good lubrication during use and prolong service life.
Factors affecting the adsorption of pulse dust collector
As the filtration time increases, more and more dust accumulates on the filter bag of the pulse dust collector, and the resistance of the filter bag increases, resulting in a gradual decrease in the processing air volume. In order for the pulse dust collector to work normally and control the resistance within a certain range, the filter bag must be cleaned. When cleaning dust, the pulse controller triggers the control valves in sequence, opens the pulse valve, and the compressed air in the air bag instantaneously sprays out into the filter bag through the pulse valve to the holes of the injection pipe. The dust attached to the surface of the filter bag falls off.
When the pulse bag filter is working normally, dust-laden gas enters the ash hopper from the air inlet. Due to the rapid expansion of the gas volume, some of the coarser dust particles fall into the ash hopper due to inertia or natural settlement, and most of the remaining dust particles follow. The airflow rises into the bag chamber. After being filtered by the filter bag, the dust particles are retained on the outside of the filter bag. The purified gas enters the upper box from the inside of the filter bag, and then is discharged into the atmosphere through the valve plate hole and the exhaust port. The purpose of dust removal.
As the filtration continues, the resistance of the dust collector also rises. When the resistance reaches a certain value, the ash cleaning controller issues a ash cleaning command. First, the lift valve plate is closed to cut off the filtered air flow; then, the ash cleaning controller pulses The solenoid valve sends out a signal, and as the pulse valve sends the high-pressure reverse airflow used for dust removal into the bag, the filter bag swells rapidly and produces strong shaking, which causes the dust on the outside of the filter bag to shake off and achieve the purpose of dust removal. Since the equipment is divided into several box areas, the above process is carried out on a box-by-box basis. When one box area is cleaning dust, the rest of the box areas are still working normally, ensuring the continuous and normal operation of the equipment. The key to the ability to handle high-concentration dust is that this strong cleaning method requires extremely short cleaning time.
The factors that affect the adsorption of the pulse dust collector are the nature of the adsorbent and the operating conditions. Only by understanding the factors that affect adsorption, can we choose suitable adsorbents and suitable operating conditions, so as to better complete the task of adsorption and separation.
1. Under normal circumstances, low-temperature operation is conducive to physical adsorption, and a proper increase in temperature is conducive to chemical adsorption. However, whether to raise or lower the temperature must be based on the adsorption melting during the adsorption process. If the melting becomes a positive value, increasing the temperature is beneficial to the adsorption operation; otherwise, lowering the temperature is beneficial to the adsorption process. The influence of temperature on gas phase adsorption is greater than that on liquid phase adsorption. For gas adsorption, pressure increase is conducive to adsorption, and pressure decrease is conducive to desorption.
2. The properties of the adsorbent, such as porosity, pore size, particle size, etc., affect the specific surface area, thereby affecting the adsorption effect. Generally speaking, the smaller the particle size of the adsorbent or the more developed the micropores, the greater the specific surface area and the greater the adsorption capacity. However, in the liquid phase adsorption process, the surface area provided by the micropores does not have a significant effect on the adsorbate with a large relative molecular mass.
3. The nature and concentration of the adsorbate have a certain influence on the gas phase adsorption. The equivalent diameter, relative molecular weight, boiling point and saturation of the adsorbate affect the adsorption capacity. If the same kind of activated carbon is used as an adsorbent, for organic substances with similar structures, the greater the relative molecular mass and unsaturation, the higher the boiling point, and the easier it is to be adsorbed. For liquid phase adsorption, the molecular polarity of the adsorbate, relative molecular weight, and solubility in the solvent affect the adsorption capacity. The greater the relative molecular mass, the stronger the polarity of the molecule, the lower the solubility, and the easier it is to be adsorbed. The higher the adsorbate concentration, the lower the adsorption capacity.
4. The activity of an adsorbent is an indicator of the adsorption capacity of the adsorbent, and it is often expressed as a percentage of the ratio of the mass of adsorption on the adsorbent to the total amount of adsorbent. Its physical meaning is the adsorption mass that can be absorbed by a unit of adsorbent.
5. Ensure that the adsorbent and the adsorbent have a certain contact time, so that the adsorption is close to equilibrium, and make full use of the adsorption capacity of the adsorbent. The time required for adsorption equilibrium depends on the adsorption rate, and the contact time is generally determined through economic trade-offs.
The performance of the adsorber of the pulse dust collector has a significant influence on the adsorption effect. The structure of the adsorber and the laying of the adsorption layer should be designed reasonably to ensure that the adsorber exerts its excellent adsorption performance.
What are the advantages of ceramic-lined jet mill
The ceramic-lined jet mill is mainly composed of a feeding device, a crushing chamber, a discharge port, a steam distribution pipe and a nozzle. The material of the feed nozzle and the grinding nozzle is made of high-strength wear-resistant and high-temperature alloy, and the nozzle structure is supersonic design; the rest of the flow parts are lined with high-strength wear-resistant and high-temperature engineering ceramics, and the feed venturi tube , The ceramic middle ring, the lining of the discharge port, the ceramic upper cover and the ceramic lower cover are made of high-strength reaction sintered silicon carbide; the steam distribution pipe and the main body cover are all made of stainless steel and polished. The appearance of the whole machine is beautiful and compact. The ceramic lined jet mill can be used in conjunction with the jet classifier. According to the physical characteristics of the material and the purity requirements of the finished product, ceramic sheets are lined inside the equipment to increase wear resistance, reduce the impact of materials on the equipment, and increase the use of the equipment Life, and control the iron content of the material in the grinding and classification process. The ceramic-lined jet mill has successfully solved a series of problems such as the adhesion of battery materials, the lack of fineness, and uneven classification.
The working principle of the ceramic-lined jet mill: After being filtered and dried, compressed air is sprayed into the grinding chamber at high speed through the Laval nozzle, and the animal material is repeatedly collided and rubbed at the intersection of the high-pressure airflow to smash. The pulverized coarse and fine mixture is under negative pressure. The fan reaches the classification zone. Under the action of the strong centrifugal force generated by the high-speed rotating classification turbine, the coarse and fine materials are separated. The materials that meet the particle size requirements are collected by the cyclone separator and dust collector through the classification wheel, and the coarse particles descend and continue to grind in the grinding zone. .
The ceramic-lined jet mill has the following performance advantages:
1. It is suitable for dry grinding of various materials with Mohs hardness below 9, especially suitable for the grinding of materials with high hardness, high purity and high added value.
2. The breakthrough of particle acceleration technology has greatly improved the grinding efficiency and reduced the energy consumption. It has small over-crushing, good particle shape, narrow particle size distribution and no large particles, and the product particle size D97=3-74 microns can be adjusted arbitrarily.
3. During the grinding process, the airflow temperature is reduced due to the rapid expansion of the airflow, which is especially suitable for the grinding of heat sensitive, low melting point and volatile materials.
4. Materials collide and grind, which is different from mechanical pulverization, which relies on the impact grinding of materials such as blades or hammers, and the addition of ceramic lining, so the equipment is less worn and the product is of high purity.
5. It can be used in series with a multi-stage air classifier to produce products with multiple particle sizes at one time.
6. The ceramic-lined jet mill is compact in structure, easy to disassemble and clean, and the inner wall is smooth and has no dead corners.
7. The entire system runs in a closed vacuum with no dust, low noise, and the production process is clean and environmentally friendly.
Advantages of jet mill
The structure of the jet mill: It is mainly composed of a grinding chamber, a nozzle orifice, a material outlet, an air flow outlet, a compressed air inlet, and a classification zone. The flat jet mill has a wide range of applications due to its simple structure and easy manufacturing.
Working principle: The compressed air or superheated steam is transformed into high-speed air flow through the nozzle. When the material is fed into the crushing chamber through the feeder, it is sheared by the high-speed air flow. The strong impact and intense friction make the material grind into ultra-fine products. The power engine and grinder are smooth and not prominent. Do not change the pulley at will, lest the speed is too high to cause the grinding chamber to burst, or the speed is too low, which will not affect the working efficiency of the grinder. The jet mill should be idling for 2-3 minutes after starting, and there should be no abnormal phenomena before the feeding operation. Pay attention to the working status of the grinder during the operation, feed evenly, prevent clogging, and do not overload the operation for a long time. If there is vibration, noise, bearing and body temperature too high, the appearance of spraying should be stopped immediately, and the operation should be continued after troubleshooting. With the development of society, some devices have made great breakthroughs in order to play a better role. The jet mill has a good effect on the grinding target and occupies a special position. In the process of operation, the use of the jet mill should pay attention to certain operations, which cannot meet the production needs and work overload. Therefore, we should pay attention to the maintenance of the jet mill to ensure its efficiency.
Advantages of jet mill
1. Non-heating, especially suitable for ultra-fine grinding of heat-sensitive materials. In addition, air can be replaced with inert gas, which is suitable for grinding inflammable and explosive materials.
2. The pollution is very small. Since the grinding principle is the collision grinding of the material itself, compared with other grinding forms, the method of blade or ball grinding will be introduced into other grinding media for comparison. The jet mill is a pulverizing process with minimal pollution, especially suitable for industries such as medicine and food.
3. It is easy to clean, and the internal transmission of airflow grinding is smaller than other ultrafine grinding machines. In particular, the spiral airflow grinder is simple in structure, easy to clean, has no dead ends, and can be used as a sterile medicine grinder.
What are the common non-metallic mineral powder fillers
Non-metallic mineral powders are widely used in plastics, rubber, papermaking, coatings, wires and cables, electronic packaging and other products, mainly for filling, reducing production costs, improving product performance, improving production processes, and enhancing the competitiveness of enterprises . Some common powder processing fillers in the market now include calcium carbonate, barium sulfate, talc, silica powder, wollastonite, mica powder, kaolin, bentonite, and so on. At present, as downstream enterprises have higher and higher requirements for powder characteristics, non-metallic mineral powder fillers are developing in the direction of high purity, ultra-fineness and functionalization.
Calcium carbonate: Calcium carbonate is a product with abundant resources and low price among non-metallic mineral powder fillers. Therefore, it has almost become the first choice for non-metallic mineral powder fillers. If calcium carbonate powder can meet the needs of filling and related functions, other more expensive fillers will not be considered.
Talc powder: Talc has excellent properties such as lubricity, acid resistance, insulation, high melting point, good hiding power, good gloss, and strong adsorption. It has a wide range of applications in plastics, rubber, papermaking, paint and other industries. In coatings and other industries, it can replace part of the expensive titanium dioxide.
Barium sulfate: According to different production processes, it can be divided into barite powder and precipitated barium sulfate powder. Barium sulfate powder is mainly used in the paper industry, paint, rubber and plastic industries. Barium sulfate is used in powder coatings. It has the characteristics of high gloss, good leveling, strong weather resistance, and stable chemical properties. It is the main means to increase the powdering rate. Used in rubber products as a filler and a reinforcement, it can enhance the anti-aging performance and weather resistance of the product, the product is not easy to age and become brittle, and can significantly improve the surface finish and reduce the production cost. Good gloss and transparency can be obtained when used in the filling masterbatch.
Silicon powder: In the industry, silicon powder is also called quartz powder. It has the characteristics of excellent dielectric properties, low thermal expansion coefficient and high thermal conductivity. It is widely used in silicone rubber, coatings, adhesives, precision casting, ceramics, epoxy resin potting materials, as well as insulation casting and integration of ordinary electrical appliances and high-voltage components. Circuit molding materials and potting materials, welding rod protective layer and other resin fillers, etc.
Wollastonite and mica powder: Among the non-mineral powder products, wollastonite and mica powder are two types of powder with relatively special particle morphology. The needle-like structure of wollastonite and the aspect ratio of the powder are one of the important indicators for investigation. Mica powder has a flake structure, and the diameter-to-thickness ratio of the powder has an important influence on its application. Wollastonite powder has needle-like, fibrous crystal morphology, high whiteness and unique physical and chemical properties. It is widely used in ceramics, paints, coatings, plastics, rubber, chemicals, papermaking, welding electrodes, metallurgical protective slag and as asbestos Substitutes, etc. Muscovite and phlogopite have good electrical insulation, non-conductivity, acid resistance, alkali resistance and pressure resistance, so they are widely used to make insulating materials in the electronics and electrical industries. Lepidolite is also the main mineral raw material for extracting lithium.
Kaolin, bentonite: Kaolin has become a necessary mineral raw material for dozens of industries such as papermaking, ceramics, rubber, plastics, chemicals, coatings, medicine, and national defense. The ceramic industry is an industry that used kaolin earlier and used a larger amount. Kaolin is used as a material in the rubber industry. Adding it to the latex mixture can improve the properties of rubber, increase the mechanical strength of rubber products, enhance wear resistance and chemical stability, and extend the hardening time of rubber. Kaolin is used as a filler in the plastics industry. Its function is to make the surface smooth, reduce thermal cracking and shrinkage, facilitate polishing, and resist chemical corrosion.
Bentonite: also known as bentonite, bentonite, and the popular name Guanyin clay, known as "a thousand kinds of minerals", it is widely used in metallurgical pellets, casting, drilling mud, textile printing and dyeing, rubber, paper, fertilizer, Pesticides, improved soil, desiccants, cosmetics, toothpaste, cement, ceramic industry, nano materials, inorganic chemicals and other fields.
Brief introduction of cyclone dust collector
The cyclone dust collector is a dust collector that uses the centrifugal force in the high-speed rotating dust-containing airflow to separate dust from the air. Because of its simple structure and easy production, it is widely used. Compared with the gravity sedimentation chamber, the particle size of the dust to be processed is smaller, and the space required to process the same amount of gas is also much smaller. However, the pressure loss of the cyclone dust collector is generally higher than that of the settling chamber, so it consumes more power.
The advantages of cyclone dust collector are:
(1) The equipment has a simple structure and low cost;
(2) The device has no moving parts and is easy to maintain;
(3) It can withstand high temperatures, for example, it can withstand temperatures up to 400°C. If special high-temperature materials are used, it can withstand higher temperatures;
(4) It can withstand high pressure (positive pressure and negative pressure) to collect dust from high-pressure gas;
(5) After the dust collector is covered with a wear-resistant lining, it can be used to purify the flue gas containing high abrasive dust.
The disadvantages of cyclone dust collectors are:
(1) The efficiency of capturing fine dust (less than 5μm) is not high;
(2) Since the dust collection efficiency decreases with the increase of the cylinder diameter, when the processing air volume is large, multiple cyclone dust collectors must be used. If the setting is improper, it will have a greater impact on the dust collection performance.
The housing of the cyclone dust collector is composed of an outer cylinder and a cone. The top of the outer cylinder is closed, and there is an exhaust pipe in the center. The gas inlet pipe is located on the side of the cylinder and is tangent to the outer cylinder. The bottom of the cone is provided with an ash warehouse and a lock air gate. The dust-laden gas enters the device along the tangential direction of the outer cylinder from the air inlet at a higher speed (usually 12-25m/s), and produces a strong rotational movement along the annular space outside the inner cylinder (exhaust pipe). , Divided into two swirling airflows upward and downward. The upward airflow reaches the top cover and then spirals downwards. The downward airflow spirals between the inner and outer cylinders due to the restriction of the inner and outer circle and the upper cover, forming an outer swirling flow. During the rotation, most of the dust particles are thrown to the periphery of the cylinder under the action of inertial centrifugal force, hit the wall of the vessel, lose kinetic energy, slide down the wall, and fall into the ash bin. The dust particles accumulated in the ash bin are automatically discharged through the gate. When the descending outer swirling airflow follows the bottom of the cone, it turns back and rises, forming a bottom-up spiraling inner swirling flow, and is discharged from the top as purified gas through the central exhaust pipe.