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Principle of Bag Dust Collector Bag Dust Collector Classification

NegotiableUpdate on 02/02

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Overview

Principle of Bag Dust Collector Bag Dust Collector Classification

Product Details

Principle of Bag Dust Collector Bag Dust Collector Classification

Keywords: bag filter, bag filter, dust collector

Bag filter is a dry dust filtering device. The dusty gas enters the pulse bag filter box through the air inlet, and the purified gas filtered by the filter bag is directly sucked in and discharged by the fan. As the filtration time increases, more and more dust accumulates on the filter bag, increasing the resistance of the filter bag and gradually reducing the processing air volume. In order to work normally, the resistance must be controlled within a certain range, and the filter bag must be cleaned. During cleaning, the pulse controller sequentially triggers each control valve to open the pulse valve. The compressed air in the air bag instantly passes through the pulse valve and is sprayed into the filter bag through various holes of the spray pipe. The filter bag expands rapidly, causing the dust accumulated on the surface of the filter bag to fall off and regenerate. The cleared dust and ash hopper are discharged through the ash discharge valve. As a result, the dust accumulated on the filter bag is periodically pulse blown to clean the dust, allowing the purified gas to pass through normally and ensuring the operation of the dust removal system.

What is the working principle of a bag filter?

1. The product function principle is that the bag filter is one of the standard general bag filters. The development of the main equipment is based on the absorption of German equipment process and work experience, and closely combined with the specific application of Chinese Mainland; The KDS bag filter adopts full negative pressure operation, and the filter carrier is a dust removal bag. Its material is mainly made of anti-static filter material or flame-retardant material, matched with a keel frame and a Venturi tube, making it more stable and the dust cleaning effect more stable; The equipment body adopts an explosion-proof structure design, with a pressure resistance of up to -10000 Pa; the equipment body is equipped with an explosion-proof safety device to protect the equipment body from damage due to explosion; The electrical equipment adopts explosion-proof standards, including solenoid valves, pulse controllers, fan motors, electrical control cabinets, etc;

2. In terms of application areas, bag filters are also applicable to all dust generating industries listed in the "Catalogue of Key Combustible Dust in Industry and Trade"; Industries include: metal product processing, agricultural and sideline product processing, wood/paper product processing, textile processing, rubber and plastic product processing, metallurgy, non-ferrous metals, building materials, mechanical processing, light industry, tobacco, etc;

3. Product advantages: ⑴ High dust removal efficiency, using PTFE coated filter material, with a filtration efficiency of over 99%. The dust concentration at the outlet of the dust collector is within 10mg/m3, and it has a high classification efficiency for fine dust with sub micron particle size.

What is the working principle of a bag filter

1. Screening effect: When the particle diameter of dust is larger than the gaps between filter fibers or the pores between dust particles on the filter material, the dust is retained, which is called screening effect. For commonly used fabric filter media, this effect is minimal because the gaps between fibers are often larger than the diameter of dust particles. Only when a large amount of dust deposits on the fabric, the filtering effect is fully displayed.

2. Collision effect: When the dusty airflow approaches the filter fiber, the airflow bypasses the fiber, but larger particles larger than 1 μ m deviate from the airflow streamline due to inertia and still maintain their original direction, hitting the fiber and capturing the dust, which is called collision effect.

3. Hook effect: When the dusty airflow approaches the filter fiber, fine dust still remains in the streamline, and the streamline is relatively tight. If the radius of dust particles is greater than the distance from the center of the dust to the edge of the fiber, the dust is captured, which is called the hook effect.

4. Diffusion effect: When dust particles are extremely small (below 0.2 μ m), they deviate from the streamline and undergo irregular motion (also known as thermal motion or Brownian motion) under the collision of gas molecules, which increases the opportunity for dust to come into contact with fibers and capture them. The smaller the dust particles, the more intense their movement, and thus the more opportunities they have to come into contact with fibers.

What are the specific advantages of bag filters?

1. High dust removal efficiency, capable of capturing fine dust particles larger than 0.3 microns. The dust removal efficiency can reach over 99%.

2. It can handle air volumes flexibly from hundreds of cubic meters per hour to hundreds of thousands of cubic meters per hour. It can be located directly indoors near the machine tool as a small unit, or as a large dust removal chamber.

3. Simple structure and stable operation. Low initial investment (compared to electrostatic precipitators) and easy maintenance. Therefore, bag filters are widely used to eliminate dust pollution, improve the environment, and recycle materials.

4. Dust treatment is easy. Bag filter is a dry purification equipment that does not require water. Therefore, there is no problem with sewage treatment or sludge treatment, and the collected dust is easy to recycle and reuse.

Bag filter

1. Mechanical vibration type refers to bag filters that use mechanical devices (including manual, electromagnetic, or pneumatic devices) to vibrate filter bags and clean dust. There are two types of bag filters: non compartment structures suitable for gap work and compartment structures suitable for continuous work.

2. Chamber back blowing type, adopting a chamber structure, using valves to switch air flow from chamber to chamber, under the action of reverse air flow, forcing the filter bag to shrink or swell and clean the dust.

3. Spray nozzle blowback type, a bag filter that uses a high-pressure fan or compressor to provide blowback airflow, and uses a moving nozzle to blow back, causing the filter bag to deform, shake, and penetrate the filter material to clean the dust (both are non chamber structures).

4. A bag filter with a combination of vibration and blowback, mechanical vibration (including electromagnetic vibration or pneumatic vibration) and blowback cleaning methods (both of which are chamber structures).

5. Pulse jet type, using compressed air as the cleaning power, uses the pulse jet mechanism to instantly release compressed air, inducing several times the secondary air to enter the filter bag at high speed, causing the filter bag to swell rapidly, and relying on impact vibration and reverse airflow to clean the dust bag filter.

Method of cleaning dust with bag filter

1. The dust removal method of gas involves using high-pressure gas to expand the dust removal bag, thereby achieving dust removal operation.

2. Vibration cleaning method: Perform vibration cleaning on the dust bag, and the dust will be automatically removed.

3. Manual tapping method for dust removal: manually tap the dust removal bag to clean the dust on the bag.

The bag filter has the following advantages:

1. The dust removal efficiency is very high, generally reaching 99%, and can capture small dust particles with a particle size greater than 0.3 microns, which can meet strict environmental requirements.

2. Stable performance. The changes in working conditions such as air volume, gas dust content, and temperature have little effect on the dust removal efficiency of bag filters.

3. Dust handling is easy. Bag filter is a dry purification equipment that does not require water, so there is no problem with sewage treatment or mud treatment, and the collected dust is easy to recycle.

4. Flexible use. The processing air volume can range from several hundred cubic meters per hour to several hundred thousand cubic meters per hour. It can be used as a small unit directly installed indoors or nearby, or as a large dust removal room.

5. The bag filter has a relatively simple structure, stable operation, low initial investment, and easy maintenance.

What are the main characteristics of a bag filter?

1. It has a very efficient dust removal efficiency, which is also a key factor in its widespread application. The dust removal efficiency is higher, reaching 99%, which is highly favored by the market and widely used in many fields.

2. The range of air volume processed is more extensive, especially in industrial boilers, which can better reduce air pollution and have been highly recognized by many consumers. Therefore, their application in the entire market is relatively large. Moreover, the design of this type of dust collector is relatively simple, making it relatively convenient for daily use and achieving excellent dust removal effects. Daily maintenance operations are relatively convenient, which can save more cost investment for more consumers, and this is also an important reason why bag filters are widely used.

3. Under the same dust removal effect, the dust removal effect of bag filters is better than many dust collectors. Even in high temperature environments, it can still be applied and the dust removal effect is very good. Not sensitive to the characteristics of dust and not affected by dust and resistance.

What are the characteristics of using a bag filter?

1. Generally, bag filters adopt a compartment structure and leave a margin in the design. The compartments of the dust collector can be rotated for maintenance without affecting the operation of the boiler. Therefore, the impact on the availability of boiler equipment is close to zero.

2. The concentration discharged from the bag filter is not affected by the specific resistance, concentration, particle size, and other properties of the dust. The effect of changes in boiler load and fluctuations in flue gas volume on the outlet concentration of the dust collector is not significant.

3. As a key issue in dust collectors, there has also been a breakthrough in the material of filter media. The service life is generally over two years, but in fact, there have been achievements of up to 4-6 years.

4. The dust concentration discharged by bag filters is low, generally below 50mg/Nm3, and can even be less than 20mg/Nm3. For low sulfur coal and high ash coal. It is very difficult to achieve such a low concentration with an electrostatic precipitator, or it requires a significant increase in investment (i.e. expanding from the conventional 3-field to 4-6 field).

5. Due to its more effective capture of fine dust, bag filters remove more rare metal particles from fly ash than electrostatic precipitators. Moreover, it can effectively remove PM10 and PM2.5 fine dust, reducing the harm to the health of the surrounding population. Bag filter has the characteristics of high cleaning energy and efficiency, as well as small size, light weight, simple and compact structure, easy installation, and convenient maintenance (external filter type).

The structure and maintenance of bag filter are relatively simple.

1. The box adopts an airtight design with good airtightness. During production, kerosene is used to check for leaks, resulting in a low air leakage rate.

2. Adopting the technique of stopping air pulse spraying and cleaning dust in separate rooms to overcome the shortcomings of conventional pulse dust collectors and separate room spraying dust collectors. Strong dust cleaning ability and high dust removal efficiency. Low emission concentration, low air leakage rate, and low energy consumption.

3. Due to the use of segmented air pulse spraying for dust cleaning, only one injection is required to achieve complete dust cleaning. Therefore, the cleaning cycle becomes longer, which can reduce the energy consumption of cleaning and significantly reduce the pressure consumption. At the same time, the fatigue level of the filter bag and pulse valve is correspondingly reduced, doubling the service life of the filter bag and valve seat.

4. Checking and replacing the bag without stopping the system fan can be carried out in separate rooms under normal system operation conditions. The filter bag mouth adopts an elastic expansion ring, which has good sealing performance and is firm. The filter bag keel adopts a polygonal shape to reduce friction between the bag and the keel. Extend the lifespan of the bag and facilitate the discharge of the filter bag.

5. Using the upper pocket method, when replacing the pocket, pull out the frame. Putting the dirty bag into the ash hopper at the bottom of the box and taking it out from the manhole improves the operating conditions for bag replacement.

6. The air duct configuration at the entrance and exit is compact, with low airflow resistance.

Do you make a bag filter with 5 advantages and 3 disadvantages?

1. Bag filter, the main structure of the bag filter is mainly composed of upper box, central box, lower box (ash hopper), cleaning system, and unloading mechanism. Let's first take a look at the 5 advantages of bag filters. In the previous introduction to the advantages, disadvantages, and prospects of bag filters, Xiaoyang Environmental Protection also provided a general overview of the advantages, disadvantages, and prospects of bag filters.

2. The bag filter has high dust removal power. The bag filter designed by Xiaoyang Environmental Protection has a dust removal efficiency of up to 99% and can capture dust particles up to 0.3um, fully meeting the requirements of environmental impact assessment.

3. The bag filter has a stable dust removal effect. We know that the working environment of bag filters, such as air volume, gas dust content, temperature, etc., will change with the working conditions, but the dust removal effect of bag filters is not significantly affected.

Regular maintenance and upkeep of bag filter

1. When the dust collector is temporarily stopped, all heating devices should continue to operate.

2. Open the ball valve at the bottom of the bag cleaning system's air bag once per shift to release the condensed water generated by the compressed air inside the bag.

3. Regularly check the operation of each pulse valve in the bag cleaning system, and promptly deal with any malfunctions.

4. Regularly clean the filter of the three-way valve air circuit and regularly add clean engine oil to the oil mist generator.

Bag filter, single machine bag filter

1. During the operation of the equipment, specialized personnel should be provided for management and operation records.

2. Managers should be familiar with the principles, performance, and operating conditions of dust collectors, and master their adjustment and maintenance methods.

3. The sealing ring should be kept tight. If aging and damage are found, they should be replaced in a timely manner.

4. The shell and other parts should be repaired in a timely manner to prevent rusting.

5. Inject injection molding of operating components such as fan motors according to regulations, and promptly eliminate any abnormal phenomena.

6. The airbag and air filter should be discharged each time.

7. If the solenoid valve malfunctions, it should be promptly discharged. If there are impurities and moisture inside the valve, it should be cleaned thoroughly. If the diaphragm is damaged, it should be replaced in a timely manner.

Maintenance knowledge of pulse bag filter

1. One reason is that the service life of cloth bags is short, and the selection of cloth bag materials should match the type of dust collector used. One of the reasons is that the purchased cloth bag materials are of poor quality. The material of the cloth bag should be selected according to technical standards and purchased from reputable manufacturers.

2. The sewing quality of the bag is also an important factor affecting the service life of the bag.

3. Thirdly, the diameter of the bag should be appropriate. If the diameter is too small, the number of filter bags, bag mouth seals, valves, and pipelines should be increased accordingly. On the contrary, if the diameter is too large, the airflow resistance increases, which affects the dust removal effect and the service life of the bag.

4. Fourthly, all conductive components of the coal mill dust collector should be grounded, such as the sealing ring of the bag opening, flower plate, shell, etc.

5. Fifthly, the filter bag should be carefully installed by skilled personnel, otherwise a slight negligence may damage the filter bag.

6. The sixth is the sealing parts of the maintenance door, ash discharge valve, and other openings of the pulse bag filter. The oil-water separation of compressed air should be very effective and reliable, otherwise condensation may occur and block the filter bag.

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Related knowledge:

The working principle of some dust collectors

1. The basic principle of a cyclone dust collector is as follows: the dusty gas enters from a tangential direction, and the airflow undergoes rotational motion while separating up and down to form a double volute motion. The dust undergoes intense separation at the boundary between the double volutes, and coarser dust particles are separated by the lower volute airflow to the outer wall. Local dust is led out from the middle opening of the bypass separation chamber, while the remaining dust is carried into the ash hopper by the downward airflow. The upward spiral vortex airflow has a collecting effect on fine particulate dust, thereby improving dust removal efficiency. The finer dust particles in this area are carried upwards by the upper vortex airflow, forming a fiercely rotating upper dust ring under the top cover. They enter the upper opening of the bypass separation chamber together with the upper vortex airflow, and are introduced into the cone through the return air outlet to collect with the internal airflow. The purified gas is discharged through the exhaust pipe, and the separated dust enters the hopper.

2. Working principle of electrostatic precipitator: When a gas containing dust particles passes through a high-voltage electric field formed between a cathode wire (also known as a corona electrode) connected to a high-voltage DC power supply and a grounded anode plate, the cathode undergoes corona discharge and the gas is ionized. At this time, the negatively charged gas ions move towards the anode plate under the action of the electric field force, and collide with the dust particles during the movement, causing the dust particles to be negatively charged. The charged dust particles also move towards the anode under the action of the electric field force, release the electrons they carry, and deposit on the anode plate. The purified gas is discharged from the dust collector.

3. Working principle of filter cartridge dust collector: Under the action of the main fan in the system, the dusty gas enters the gas box at the bottom of the dust collector from the inlet at the bottom of the dust collector to stop the pre-treatment of the dusty gas, and then enters each dust removal chamber in the upper box from the bottom; Dust is adsorbed on the surface of the filter cartridge, and the filtered clean gas enters the clean air chamber of the upper box through the filter cartridge and gathers at the air outlet for discharge.