What is the basis for choosing a wet dust collector?

Dust removal efficiency: The efficiency of the wet dust collector is one of the most important performance indicators to choose, the gas flow rate in a certain state is specific to the dust pollutants, and the state of the gas has a direct impact on the capture efficiency.

Operational flexibility: For any piece of equipment, it is important to consider its load, the effect on the capture efficiency when the air flow exceeds or falls below the design value, and how it will operate when the dust concentration is unstable or continuously higher than the design value.

Hydrophobicity: The wet dust collector is not very efficient at purifying hydrophobic dust, and it is generally not suitable for how it will be operated when the design value is intended.

Cohesiveness: Wet dust collectors can purify cohesive dust, but flushing and cleaning should be considered to prevent clogging.

Corrosiveness: Anti-corrosion measures should be considered when purifying corrosive gases.

Water consumption: how much water is consumed by the dust collector and the sewage treatment and winter anti-freezing measures for the discharged water.

Mud treatment: Mud treatment is an inevitable problem for wet dust collectors, and efforts should be made to reduce the degree of pollution.

Operation and maintenance: In general, it should be avoided that there are moving or rotating parts inside the dust collector, and it should be noted that the gas passing through the flow channel section too small will cause blockage.

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The nature of dust, flammable and explosive stickiness, etc.!

Advantages of wet dust collectors:

1. When the same energy consumption is consumed, the efficiency of the wet dust collector is higher than that of the dry dust collector, and the dust removal efficiency of the high-energy wet dust collector is still very high after washing the dust particles below.

2. The dust removal efficiency of the wet dust collector is not only comparable to that of the cloth bag and the electrostatic precipitator, but also can be applied to the dust removal conditions that these dust collectors are not capable of. The wet dust collector has a high exhaust gas treatment efficiency for purifying dusty gases with high specific resistance, high humidity, high temperature, flammable and explosive.

3. The wet dust collector can remove the water vapor and some toxic and harmful gas pollutants in the gas while removing the dust particles containing the dust. Therefore, the wet dust collector can not only remove dust, but also play an exhaust gas treatment role for gases.

Disadvantages of wet dust collectors:

1. The sediment discharged by the wet dust collector needs to be treated, and the clarified washing water should be reused, otherwise it will not only cause secondary pollution, but also cause waste of water resources.

2. When purifying corrosive pollution, the washing water (or liquid) will have a certain degree of corrosiveness, so the dust removal equipment should have certain anti-corrosion measures.

3. The wet dust collector is not suitable for purifying organic waste gas containing hydrophobic and hydraulic dust.

4. The application of wet dust collector in cold areas is easy to freeze, so anti-freezing measures should be taken.

Wet dust collector, also known as "water dust collector", is a device that makes the dust-containing gas in close contact with the liquid, and uses the inertial collision of water droplets and particles and other effects to capture particles or make particles larger.

The wet dust collector is a combination of water bath and spray in one. First, the suction power of the high-pressure centrifugal fan is used to press the dusty gas into a water tank filled with water at a certain height, and the water bath will adsorb a part of the dust in the water.

After the distribution is evenly distributed, the gas flows from the bottom to the top, while the high-pressure nozzle sprays water mist from the top down to capture the remaining dust particles. Its filtration efficiency can reach more than 85%.

Summary. Wet electrostatic precipitator is a new dust removal equipment used to deal with trace dust and fine particles, mainly used to remove dust, acid mist, water droplets, aerosols, odors, and other harmful substances in humid gases, and is an ideal equipment for controlling atmospheric dust pollution. Wet electrostatic precipitators, often referred to as WESPs, have the same basic principle of dust removal as dry electrostatic precipitators, and go through three stages: charging, collection, and cleaning.

Wet electrostatic precipitator is a new dust removal equipment used to deal with trace dust and fine particles, mainly used to remove dust, acid mist, water droplets, aerosols, odors, and other harmful substances in humid gases, and is an ideal combustion mold for controlling atmospheric dust pollution. The wet electrostatic precipitator, usually referred to as WESP, has the same basic principle of dust removal as the dry electrostatic deskinning section dust retarder, and has to go through three stages: charging, collection and ash cleaning.

Can you add, I don't quite understand it.

The wet electrostatic precipitator and the dry electrostatic precipitator have the same principle of dust collection, both rely on high-voltage corona discharge to make the dust charged, and the charged dust reaches the dust collection plate under the action of electric field force. The dry electrostatic precipitator mainly treats dry gases with very low water content, and the wet electrostatic precipitator mainly treats wet gases with high water content or even saturated. In the dust collection plate tube to the dust collection to remove the way of WESP and DESP has a big difference, the dry electrode number dust collector generally adopts mechanical vibration or sonic cleaning and other methods to remove the dust on the electrode, and the wet electrostatic precipitator adopts the mode of regular flushing traces, so that the dust is removed with the flow of scouring liquid.

The head of the state.

Dry dust collectors do not require water as the dust removal medium and account for more than 90% of all dust collection systems.

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

Unable to remove toxic and harmful components from the gas; Improper treatment is easy to cause secondary dust. It should be noted that when dealing with dusty gases or high-temperature gases with high relative humidity, it is necessary to take anti-condensation satanic application, otherwise it is easy to produce dust bonding and blockage of pipelines.

Wet dust collector with water as the purification medium.

Characteristics of wet dust collector: the structure of the dust collector is simple, the initial investment is low, and the purification efficiency is high; While removing dust, the wet dust collector can also absorb other harmful components in the dust-containing gas and reduce the gas temperature; Able to handle corrosive dusty gases with high relative humidity. The disadvantages are:

The water consumption is large, and the dusty sewage discharged must be set up with sewage treatment facilities for secondary treatment; The overall energy consumption is higher, for example, the resistance of a venturi dust collector (which must be sharpened first in a high-efficiency wet dust collector) is much higher than that of a dry dust collector with the same efficiency. It should be noted that flushing devices need to be set up on the pipes and dust collectors to prevent dust sticking and pipeline blockage.

If dusty gases are corrosive, dust collectors and pipes need to be made of corrosion-resistant materials or waterproof paint applied to the inside of the pipes.

Hope it helps.

Dry dust collectors are generally divided into several categories: 1. Gravity dust collectors. 2. Inertial dust collector. 3. Filtering dust collector.

The commonly used settling chamber belongs to the first type, and the cyclone dust collector and multi-tube cyclone dust collector belong to the second type. Cartridge dust collector and bag dust collector belong to the third type.

Wet dust collectors include: water film dust collector, cyclone water film dust collector, water bath dust collector, multi-tube impact dust collector, impulse dust collector, venturi dust collector, foam dust collector, turbulence tower, packing tower, adsorption tower, etc.

Dry dust collectors are generally used in situations where the dust concentration is large, the particle size is small, the flue gas humidity is not large, or the flue gas hydrophilicity is not good. Wet dust collectors are generally used in occasions with large dust particle size, flammable and explosive dust, and good hydrophilicity.

Generally speaking, the dust removal efficiency of the wet dust collector is lower than that of the bag and filter cartridge dust collector in the dry dust collector, but the wet dust collector has low cost and low maintenance cost. Therefore, in the occasion of high environmental protection requirements, dry dust collectors are used more, and wet dust collectors have a tendency to be eliminated, except for special occasions such as flammable and explosive or limited investment, they are rarely used.

The so-called dry dust removal means that the liquid is not suitable in the dust removal process, mainly water, and the dust exists in a dry powder state. The equipment used in dry dust removal is mainly electrostatic dust removal and bag dust removal.

Corresponding to dry dust removal, wet dust removal is the use of liquid, mainly water, in the dust removal process, and the dust-containing gas is in contact with water, and the dust particles in it remain in the water and are in the form of mud.

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In the existing environmental protection product industry, both manufacturers and users are helpless about the problems existing in wet purification equipment (especially wet purifiers). Taking the wet boiler dust collector as an example, as the wet dust collector that must be used for boiler flue gas desulfurization, its problems are as follows.

1) To improve the purification efficiency, it is necessary to increase the resistance of the equipment, and the increase of resistance is difficult to meet the needs of the original configuration of the fan of the system for the transformation project, if the fan is to be replaced, this is not only a waste, but also makes it difficult for the user to accept it due to the increase in the cost of transformation.

2) When purifying gaseous pollutants containing corrosiveness, the washing water (or liquid) has a certain corrosiveness, and the metal equipment is easy to be corroded, and anti-corrosion measures must be taken for dust collectors and sewage treatment facilities.

3) The separation of gas and water is not good, and the flue gas carries water, which has an impact on the dynamic balance and service life of the fan after the dust collector.

4) The slurry or waste liquid discharged from the wet dust collector needs to be treated, otherwise it will cause secondary pollution.

5) The energy consumption is relatively large.

There are more water treatment processes, which are more complex than dry ones. Unless the dry type cannot meet the requirements and the wet type must be used to meet the requirements.

There are many types of wet dust collectors, which are generally divided into the following types according to their structure: (1) Gravity spray wet dust collectors, such as spray strip towers.

2. Cyclone wet dust collector, such as cyclone water film dust collector and water film dust collector.

3) Self-excited wet dust collectors, such as impact dust collectors and water bath dust collectors.

4) Packed wet dust collectors, such as packed towers and turbulent ball towers.

5) Foam wet dust collectors, such as foam dust collectors, cyclone dust collectors, leaky plate towers, (6) Venturi wet dust collectors, such as venturi dust collectors.

7) Mechanically induced dust collectors, such as water wheel dust collectors.

There are many types of wet dust collectors, and the efficiency of different types varies greatly. For the purification of ferroalloy electric furnace dust, cyclone water film dust collector, impact dust collector, spray dust collector, etc. can not meet the standard, and only the use of high-energy venturi dust collector and enhanced wet dust collector can meet the requirements. With high-energy Venturi dust collector, the investment is the most economical, but the operating cost is very high, because its throat gas speed is as high as 130m s, and the resistance drop is as high as 18kpa, so it is equipped with a fan with great power, in addition to the inertial collision of the conventional wet dust collector, it also uses diffusion coagulation, static electricity and other effects to remove dust, so it has a high efficiency for the removal of fine smoke and dust, and the operating cost is not too high.

Of course, wet dust collectors have secondary pollution problems, so it is necessary to have water treatment facilities and recycle water.

Desulfurization, treatment of viscous dust, etc.

Hello, the difference between dry dust removal and wet dust removal is: first of all, the advantage of dry dust removal is that it does not need to use water as an introduction, accounting for more than 90% of all dust removal systems. The main feature of the most buried town is the use of impact and rapping for ash cleaning, and most of the dust treated is dry powder, which has the use of centralized production and comprehensive utilization.

It has the characteristics of small footprint, wide range of application and high dust removal efficiency, and is widely used in large-scale dust removal. Common dry dust collectors include bag filters, filter cartridge dust collectors, cyclone dust collectors, etc. Its disadvantage is that it cannot remove the harmful components in the gas, and improper treatment can easily cause secondary pollution.

Secondly, the wet bending rough dust removal, using water as the purification medium, the structure design is simple, the initial investment is low, and the dust removal efficiency is high. When dealing with dust, it can absorb other harmful components in the vacuum cleaner and achieve the purpose of cooling; In addition, it is capable of handling corrosive gases with high relative humidity. Its disadvantage is that the dust removal equipment with single structure, large volume and low relative efficiency can only be coarse purification, and the dust removal efficiency cannot be reached.

First, the main difference is the different structure. Bag filter is a kind of dust removal equipment that uses organic fiber or inorganic fiber filter material to filter out the dust in the dust-containing gas.

The structure of the wet dust collector: Although the structure of different types of wet dust collectors is quite different, it is generally composed of a dust and gas introduction device, a water diversion device, a water vapor contact body, a droplet separator and a sewage (sludge) discharge device.

Both can better capture dust and deal with some harmful gases.

2. Comparison between wet dust collector and bag dust collector:

With the same amount of energy, the dust collection efficiency of a wet dust collector is higher than that of a bag filter.

Wet dust collectors are suitable for handling high-temperature, high-humidity flue gases and viscous dusts. Under the same circumstances, baghouses are often limited;

The wet dust collector can use other liquids instead of water according to the nature of the gas absorption, and it is more appropriate to remove harmful gases with wet.

The wet dust collector has a simple structure, a small footprint, and a low total cost.