What are the factors that affect the efficiency of a cyclone?

1. Inlet flow rate Increasing the flow rate of the inlet pipe within a certain range can improve the dust removal efficiency. However, if the inlet flow rate is too high, some of the separated dust particles will be swept away by the inner swirl, resulting in a decrease in dust removal efficiency. In addition, the pressure loss is proportional to the square of the inlet velocity, and if the inlet flow velocity is too large, the pressure loss rises.

Thus. From the comprehensive consideration of technology and experience, the appropriate range of inlet flow velocity is generally taken as one, two, two 0m s, and should not be lower than one 0m s, so as to prevent dust accumulation in the inlet pipeline. 2. The smaller the diameter of the simplified body, the greater the centrifugal force of the dust particles and the higher the dimensional efficiency at the same tangential speed.

The change of the height of the simplified body has no obvious effect on the dust removal efficiency, and the appropriate lengthening of the height of the vertebral body is conducive to improving the dust removal efficiency. 3. Dust particle size and density Because the centrifugal force of dust particles is proportional to the cubic of particle size, and the radial gas resistance is only proportional to the primary square of particle size, large particle size is easier to capture than small particle size. The dust removal efficiency increases with the increase of the true density of dust particles, and the dust removal efficiency decreases when the density is small and difficult to separate.

Fourth, gas temperature and viscosity The gas viscosity increases with the increase of temperature, and the segmented particle size is proportional to the square root of viscosity, so the dust removal efficiency of cyclone dust collector decreases with the increase of gas temperature and viscosity. 5. The air tightness of the lower part of the dust removal equipment The internal static pressure of the dust collector gradually decreases from the outer wall to the center, and even if the dust removal is running under positive pressure, the bottom of the cone may be in a negative pressure state. If the lower part of the dust collector is not strict and leaks air, the dust that has fallen into the ash hopper will be taken away again, so that the dust removal efficiency will be significantly reduced.

The efficiency of the vacuum cleaner has the factor of sufficient power, and it is also judged by how much power it has.

There should be a big reply in the vacuum cleaner.,It should be poured out.,The specific words are clear.。

The shortcomings of the dust collector are mainly manifested in the innovation of filter media and the change of ash cleaning methodsThe filter bag is the heart of the bag filter, and the maintenance cost of the filter bag accounts for the largest proportion of the maintenance cost of the dust collector, up to more than 70% of the maintenance cost. Filter bags are the most critical factor in determining the performance of a dust collector. The main factors that cause damage to filter bags are:

High temperature burning, corrosion, mechanical damage, installation quality, product quality, operation, management and other reasons.

Design issues. Reasonable design is the premise to ensure the life of the filter bag, but in the design process of the bag filter, too much attention is often paid to various economic indicators, and it is easy to ignore the rationality of the distribution of the air flow field in the filter chamber. Due to the unreasonable distribution of airflow, the speed between the bags will be too fast, resulting in damage to the filter bags from time to time.

In the early mechanical rotary flat bag dust collector, the density of the inner filter bag arrangement was the largest among the existing dust collectors, resulting in the erosion damage of the filter bag by the air flow. The selection of the length-diameter ratio of the filter bag is unreasonable, which will also cause the bag mouth speed to be too fast and wear the filter bag.

Dust collectors can be divided into two categories: Dry dust collectors: including gravity settling chambers, inertial dust collectors, electrostatic precipitators, bag dust collectors, and cyclone dust collectors.

Wet dust collectors: including spray towers, impact dust collectors, venturi detergents, foam dust collectors and water film dust collectors, etc. At present, the most common applications are cyclone separators, electrostatic precipitators and bag filters.

Advantages of dry dust collector: wide range of use, most dust collection objects can use dry dust collector, especially for large centralized dust collection system; The state of dust discharge is dry powder, which is conducive to centralized treatment and comprehensive utilization.

The disadvantages of dry dust collectors are: they cannot remove toxic and harmful components in the gas; Improper treatment is easy to cause secondary dust.

The advantages of wet dust collector are: (1) Because the process of mass transfer and heat transfer occurs at the same time during the contact between gas and liquid, this type of dust collector not only has the effect of dust removal, but also has the effect of flue gas cooling and absorption of harmful gases. (2) It is suitable for dealing with high temperature, flammable, explosive and harmful gases.

3) Normal operation and high purification efficiency. (4) It can be used for dust and gas accumulation. (5) Exhaust weight and balance.

6) Simple structure, small footprint, low investment. (7) Safe operation, easy operation and maintenance.

The disadvantages of the wet dust collector are: (1) The slurry discharged from the wet dust collector must be treated, otherwise it will cause secondary pollution. (2) When there is an aggressive gas in the purification, the chemical aggressiveness is transferred to the water, so the sewage system should be protected with anti-corrosion materials.

3) Not suitable for hydrophobic fumes; For sticky soot, it is easy to clog pipes, blades, etc. (4) Compared with the dry dust collector, it needs to consume water, and it is difficult to deal with, so anti-freezing measures should be adopted in severe cold areas.

In the actual use process, there are some inevitable problems in the general cyclone dust collector, such as: compression of local air flow, short-circuit flow of dust collector, secondary dust in different parts, mutual friction and interference between air flows, dust accumulation, etc., these problems will have a non-negligible impact on the performance of the cyclone dust collector. Some problems have been solved relatively well by existing improvement measures, but there are still some problems, such as:

Secondary dust generated by local vortex in the cone part, pressure loss in the exhaust pipe, etc. The cyclone dust collector is a high-speed rotating airflow, and small changes in structure and size will have a non-negligible impact on the movement of the airflow.

There is a cause of the problem and how to solve it.

The problems of the baghouse are mainly focused on the filter material and the design air velocity, while the problem of the cyclone is manifested in the study of the relationship between the airflow and dust particles and the design of the structure size. The problems existing in the bag filter and the cyclone dust collector are mainly determined by the dust removal mechanism of the two, and the dust removal effect of the bag filter mainly depends on the filter material, so the filter material of different materials and different textile densities largely determines the dust removal efficiency of the bag filter. The problem of cyclone dust collector mainly involves the law of air flow movement, so when improving the cyclone dust collector, we should deeply study the law of air flow movement, and on this basis, a more reasonable and scientific structure size can be designed.

Advantages of cyclone dust collectors:

The investment is small, the area is small, there is no power, and it is easy to place.

There are no moving parts inside the cyclone, making it easy to maintain.

It is very convenient to make and handle. The layout is simple and the price is homemade.

When dealing with large air volumes, it is convenient for multiple units to be used in parallel, and the obedience resistance is not affected.

It can withstand 400 high temperatures, and can also withstand higher temperatures if special high-temperature resistant materials are used.

The dust collector is equipped with a wear-resistant lining, which can be used to purify flue gas containing highly corrosive dust.

Dry cleaning can be done to facilitate the use of costly dust.

Disadvantages of cyclone dust collectors:

The purification obedience is low, and the purification obedience can reach 70% for large particle dust, while the fine dust does not have much effect.

If the ash discharge valve leaks, it will severely affect the dust removal obedience. Severe abrasion, especially for high-concentration or abrasive dust, the inlet and cone parts are easy to wear.

The dust removal obedience is not high (for the fine dust with a captured particle size of less than 5um and the dust with small dust particle density, the obedience is very low), and the requirements of dust-containing gas emission concentration cannot be met by chance when used alone.

The cyclone dust collector we usually use is a dust removal device that uses the centrifugal force generated by the rotating air flow to separate the dust particles from the combined air flow. The cyclone dust collector is generally used to capture particles above 5-15 microns, and the dust removal efficiency can reach more than 80, and the special cyclone dust collector that has been improved in recent years can have a dust removal efficiency of more than 95. The dust removal mechanism is that the dusty flue gas enters the airflow distribution chamber, flows into the cyclone, and forms a swirl in the cylinder through the spiral guide piece, and the dust particles are separated from the gas due to the action of centrifugal force, and the separated dust particles are discharged into the ash hopper by the cone along the cylinder wall, and the ash is stored to a certain storage degree, and is discharged by the discharger.

The purified flue gas is discharged from the cyclone sub-core pipe through the outlet of the exhaust chamber. Because the cyclone dust collector has a simple structure and no moving parts (except for the ash discharge valve), the operation management is relatively easy, but once there is a fault such as wear, air leakage, and blockage, it will seriously affect the dust removal efficiency.

Its advantages: there are no other moving parts except the ash unloading device, and it is easy to maintain. Its disadvantages: the dust removal efficiency is not high, and it is difficult to meet the environmental protection requirements when used as a single machine.

Advantages: The installation of cyclone dust collector will extend the life of the bag filter after the system and reduce the operation investment.

Disadvantages: If the cyclone dust collector is used alone, the emission cannot meet the existing standards.

The most commonly used is the bag filter.

The advantages of cyclone dust collector are that there are few accessories, small maintenance, no fan can be used, low counterfeiting, and easy installation.

Xi'an Lanze Environmental Protection introduces the characteristics of the dust collector.

1. The pulse bag filter adopts the pulse injection cleaning technology of sub-chamber air stop, which overcomes the shortcomings of the conventional pulse dust collector and the sub-chamber back-blowing dust collector, with strong ash cleaning ability, high dust removal efficiency, low emission concentration, small air leakage rate, less energy consumption, less steel consumption, less floor space, stable and reliable operation, and good economic benefits. It is suitable for the purification of dusty gases and materials in metallurgy, building materials, cement, machinery, chemical industry, electric power and light industry industries.

2. Due to the use of sub-chamber air stop pulse jet cleaning, the purpose of thorough ash cleaning can be achieved by spraying once, so the ash cleaning cycle is extended, the energy consumption of ash cleaning is reduced, and the compressed air consumption can be greatly reduced. At the same time, the fatigue of the filter bag and pulse valve is also reduced, which doubles the life of the filter bag and valve plate.

3. The overhaul and bag change can be carried out in separate rooms under the normal operation conditions of the non-stop system fan and the system. The mouth of the filter bag adopts an elastic expansion ring, which has 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 is convenient for bag unloading.

4. The upper bag pumping method is adopted, after the skeleton is pulled out when the bag is changed, the dirty bag is put into the ash hopper at the lower part of the box and taken out from the manhole, which improves the operating conditions of bag changing.

5. The box body adopts airtight design, good sealing, excellent sealing materials are used for inspection doors, and kerosene is used to detect leaks during the production process, and the air leakage rate is very low.

6. The inlet and outlet air ducts are arranged compactly, and the airflow resistance is small.

The efficiency of the cyclone increases with the inlet airflow velocity, and the resistance also increases with the inlet airflow velocity.

Therefore, if the efficiency of the dust collector is to be improved, the inlet air velocity must be increased, and the dust collector resistance must be increased.

If you want to reduce the resistance of the dust collector, you have to reduce the inlet air velocity, and the efficiency of the dust collector will be reduced accordingly.

This shows that in the selection of dust collectors, efficiency and energy saving are always contradictory and cannot be both.

The factors that affect the efficiency of a cyclone dust collector are as follows:

1.Dust properties: The physical and chemical properties of different dusts are different, and their density, charge, particle size, surface properties, etc. will affect the efficiency of the cyclone dust collector.

2.Inlet air velocity: The efficiency of the cyclone dust collector is directly proportional to the inlet air velocity, the larger the inlet air velocity, the more obvious the centrifugal effect of the dust on the cyclone dust collector, and the dust can be quickly separated.

3.Separator size: The size of the separator of the cyclone dust collector determines the magnitude of its centrifugal force, the larger the size of the separator, the greater the centrifugal force, and the higher the dust removal efficiency.

4.Cyclone dust collector structure: The structural form and design parameters of the cyclone dust collector will also affect its efficiency, such as cyclone bypass ratio, cyclone cylinder height-to-width ratio, etc.

5.Operating environment: The temperature, humidity, pressure, etc. of the operating environment of the cyclone dust collector will also affect its efficiency, and too high or too low temperature and humidity, too high pressure will affect its performance.

It should be noted that the above factors will affect each other, and the design and adjustment of cyclone dust collectors also need to consider the influence of various factors.

1.Influence of the geometric size of the cyclone dust collector: In the geometric size of the cyclone dust collector, the diameter of the cyclone dust collector, the gas inlet, and the shape and size of the exhaust pipe are the most important influencing factors.

2.The influence of cyclone dust collector gas parameters on the performance of the dust collector: including the influence of gas flow number, gas dust concentration, cyclone dust collector gas moisture content, gas density, viscosity, mountain pressure and temperature;

3.The influence of the physical properties of the dust of the cyclone dust collector on the dust collector;

4.Influence of the roughness of the inner wall of the cyclone dust collector: the dust particles concentrated near the wall will cause swirl due to the rough surface, and the potato cavity cyclone dust collector will throw some dust particles into the rising air flow and enter the exhaust pipe, reducing the dust removal efficiency.

The premise of calculating the dust removal efficiency of the cyclone usually includes the following points:

Determine the type of dust to be removed and the particle size distribution to be removed in order to determine the cyclone diameter and design parameters to be used in the collector.

Determine the inlet airflow velocity, which is usually determined by the velocity of the gas to be treated and the amount of megalead in the flow beam.

Determine the volume concentration of dust in the inlet gas in order to determine the design capacity of the cyclone.

Determine the length and height of the cyclone tube, as well as the length and pressure drop limits of the cyclone duct to ensure adequate rotation and efficient separation of the airflow within the equipment.

Determine the dust collection efficiency of the cyclone and the concentration of dust in the exhaust gas in order to evaluate the performance and cost-effectiveness of the equipment.

It should be noted that the dust removal efficiency of the cyclone dust collector is also affected by many influencing factors, such as airflow velocity, inlet and outlet shape, airflow pressure and temperature, etc., so the actual efficiency may be biased.