What are the advantages and disadvantages of stand alone dust collectors?

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 dust collectors and bag dust collectors.

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) The exhaust volume is weighed by the lead.

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) Unbonded cleaning is used 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.

The advantage of the dust collector's quiet closure is that it can effectively remove start-up dust and other particulates from the air, thereby reducing air pollution. In addition, they can effectively improve indoor air quality and reduce allergy symptoms. The disadvantage is that the dust collector needs to be cleaned and maintained regularly to ensure its effective volatile.

The quality of small stand-alone dust collector is determined by the quality of five aspects: shell and coating, filtration system and ash cleaning system, and electronic control system.

Stand-alone dust collectors, especially small ones, should consider the following factors in the quality of the equipment if they want to be effective when dealing with dust at conventional temperatures.

1: Regarding the emission requirements, regardless of the amount of dust of the user, there are requirements for the industry emission standards, and the emission standards directly affect the basic design ideas of the equipment.

2: The differential treatment of dust, different dust, requires different accessories and materials to be treated, otherwise it will directly affect the service life of the equipment, and will increase the replacement cost of accessories.

3: The ratio of actual wind speed and wind pressure, if you don't understand, the increase of wind speed will cause the life of equipment accessories to be reduced, and at the same time increase the increase in operating electricity costs.

4: The production of equipment and the selection of accessories, can not be dried, the solder joints jump randomly during production, the air leakage rate is high, and the dust removal effect of the equipment is discounted.

In terms of design and production, technical design is also needed to complete the reasonable treatment effect of the user's working conditions.

The quality of a small stand-alone dust collector is affected by the following aspects:

1.Material Quality: The quality of the material selected determines the durability and longevity of the dust collector. Generally speaking, qualified materials should have the characteristics of wear resistance, corrosion resistance, corrosion resistance, high temperature resistance, etc.

2.Design quality: The design quality of the dust collector also has a great impact on the dust removal effect and service life. A well-designed dust collector will have a better structure and operation, making it more efficient and reliable.

3.Manufacturing process: The manufacturing process of the dust collector should also be fine, so as to ensure the accuracy of the device and the stability of the function.

Certain specifications need to be followed during the manufacturing process to ensure the ease of repair and maintenance of the dust collector, but also to avoid breakdowns and accidents in use.

4.Product testing: After the dust collector is manufactured, various tests are required to verify its quality. For example, it is necessary to test the dust removal effect and stability of the dust collector to ensure that the product fully meets the requirements and is safe and reliable.

In summary, the quality of the dust collector is affected by many factors, and the key lies in the quality of materials, design and manufacturing, as well as the strict management of product testing and quality assurance.

a) The main advantages of electrostatic precipitators.

1. High purification efficiency, it can improve the dust removal efficiency by increasing the effective flow area of the electric field, improving the control quality of the controller, lengthening the length of the electric field, and modulating the flue gas. During the normal operation of conventional electrostatic precipitators, the dust removal efficiency is usually higher than 99%, and it can capture fine dust above microns.

2. The resistance loss is small, the equipment resistance is small, and the total energy consumption is low. The total energy consumption of the electrostatic precipitator includes the energy consumption of the power supply device, heating device, equipment resistance, rapping and auxiliary equipment (ash discharge motor, gasification fan, etc.). The resistance loss of the electrostatic precipitator is usually 150-300pa, which is about 1 5 of the bag filter, and its proportion in the total energy consumption is relatively low.

Generally speaking, only electricity is required for every 1000 m h of flue gas processed.

3. Large flue gas treatment capacity. Because the structure of the electrostatic precipitator is easy to modularize, its device can be relatively large. The electric field cross-sectional area of a single electrostatic precipitator can reach 400 square meters.

4. The allowable operating temperature is high. Just like the SHWB electrostatic precipitator, it allows the operating temperature to reach 250, and some can even reach 350-400 and beyond.

5. The electrostatic precipitator fully realizes the function of automatic control and automatic operation.

b) The main disadvantages of electrostatic precipitators.

1. The equipment is relatively complex, and it is not very easy to transport, install and maintain the management level of the equipment, and the operator is required to have a certain level.

2. There are certain requirements for dust resistance, so dust has a certain selectivity, that is to say, not all powder liters and dust have a generally high purification efficiency.

3. It will be affected by the operating conditions such as gas humidity and temperature, and the influence is greater. For example, even if the same dust is operated under different temperatures and humidity, its use effect is different. Some dusts can play a good role in a specific temperature and humidity, but in another temperature and humidity state, due to the change of dust resistance, the electrostatic precipitator may be almost impossible to use.

4. The electrostatic precipitator is large at one time, and the horizontal electrostatic precipitator needs to occupy a large area.

There are many factors that go into choosing dust removal equipment, which can be summarized into three categories: environmental, engineering and economic.

1) Environmental factors include the location of the dust removal equipment, the available space, the surrounding conditions, the maximum allowable discharge concentration, the wastewater and solid waste that may be generated, etc.

2) Engineering factors include the characteristics of dust-containing gases, the characteristics of soot and dust removal performance and design.

3) Economic factors include basic investment (equipment costs, installation costs, engineering costs, etc.), operating costs (electricity, water and maintenance), equipment life and depreciation costs, etc.

Particulate pollutant control technology, often referred to as dust removal technology, has many types of methods and equipment, each with different performance and characteristics.

The advantages of a dust collector are:

1) Because the whole process of convection heat transfer and heat conduction is generated together in the whole process of vapor and liquid contact, this dust removal equipment not only has the effect of ash removal, but also has the effect of reducing the temperature of smoke and dust and digesting and absorbing harmful substances.

2) It is suitable for solving high temperature, flammable and explosive materials and harmful substances.

3) Everything is working normally, clean and efficient.

4) It can be used to collect smoke and vapor.

5) Displacement weighting.

6) The structure is simple, the land occupation is small, and the project investment is low.

7) Operational safety, practical operation and convenient maintenance.

The defects of the dust collector are:

1) The drilling mud discharged from the wet dust collector should be solved, otherwise it will lead to pollution.

2) When there are corrosive and combustible substances in the cleaning, the organic chemical adhesion migrates into the water, so the wastewater system software must be maintained with anti-corrosion coatings.

3) It cannot be used for hydrophobic soluble dust; For sticky dust, it can clog pipes and leaves.

4) Compared with dry well dust removal equipment, it must consume water, and it is difficult to solve, so cold protection measures should be selected in plateau areas.

Nowadays, vacuum cleaners have become an essential tool for many families. But when you use a vacuum cleaner to clean your home easily, do you think of a mechanical dust collector? Do you know how a mechanical dust collector works?

Next, let me introduce you to the working principle of different mechanical dust collectors.

A mechanical dust collector is a device that relies on mechanical forces (gravity, inertia, centrifugal force, etc.) to remove dust particles from the gas stream. It is characterized by simple structure, low equipment cost and operating cost, but dust removal efficiency is not high. According to the different dust particles, it can be designed as gravity dust chamber, inertial dust collector and cyclone dust collector.

It is suitable for airflow with high concentration of macro-air dust removal and large particle strength. It is widely used in occasions where dust collection requirements are not high, or as a pre-pre-dust collector for high-efficiency dust collection devices.

Gravity settling chamber:The gravity settling chamber works by using the gravity of dust, which is the attraction of the earth to objects. The dust in the dusty gas is separated in the settling chamber by gravity.

Inertial Dust Collector:Inertial dust collectors utilize inertial forces. The so-called inertial force is a force that reflects the state of motion of matter itself, and the state of motion of matter changes when it is subjected to external force.

Under the same action, the object with small inertia is easier to change the state of motion than the object with large inertia, that is, the acceleration obtained is relatively large, which is beneficial to the dust separation with small inertia.

Cyclone Dust Collector:Cyclones use centrifugal force. The so-called centrifugal force refers to the reaction force of the object in circular motion to the centripetal separation force applied to it, and the separation process of separating the heterogeneous system by centrifugal force is commonly known as centrifugal separation, and the cyclone dust collector is also called the cyclone separator, which is based on the principle that the centrifugal force obtained by the mass and fast rotation speed in the rotation process is also large.

The mechanical dust collector has low efficiency, low resistance, energy saving, and can be used alone in occasions where the air volume is not large and the dust removal requirements are not high; In the case of strict requirements, it is often used as a pre-dust removal for advanced dust collectors.

The selection of the dust collector should take into account the nature of the dust.

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Factors that should be considered in the selection of general dust collectors:

1. Chemical composition, corrosivity, temperature, humidity, flow and dust concentration of dust-containing gas; 2. Chemical composition, density, particle size distribution, corrosiveness, water absorption, hardness, specific resistance, adhesion, fibrous and flammability, etc. of dust;

3. Allowable emission concentration of purified gas;

4. The grading efficiency or total efficiency of the dust collector;

5. The value and utilization form of dust;

6. The complexity of maintenance management.

1.chemical composition, corrosivity, temperature, humidity, flow rate and dust concentration of dusty gases;

2.Chemical composition, density weight, particle size distribution, corrosivity, water absorption, hardness, specific resistance, cohesiveness, fibrous and flammability, etc. of dust;

3.the allowable emission concentration of the purified gas;

4.the grading efficiency or total efficiency of the dust collector;

5.the value of dust and the form of utilization;

6.The complexity of maintenance management.