Dust collector fan, how to select, what are the types of dust collectors

Dust collector fan selection: The fan selection is determined according to the dust removal system, which mainly determines the air volume and pressure loss of the dust removal system. Then it is determined according to the selection parameters of the fan manufacturer. You can also refer to ** Selection Software after screening.

Fan selection method.

In the application of wind turbines, in addition to meeting the requirements of its flow rate and air pressure, the requirements for efficient operation of the fan should also be considered, which is an important factor in the reasonable selection of the fan. Fan performance is the basis for reasonable selection of fans, and the methods of fan selection are different in different ways of expressing fan performance.

1) Use the fan performance table to select the fan.

This method is the same as using the pump performance table to select the pump, although it is simple and convenient, but it cannot accurately determine the working condition of the fan unit. This method is only suitable for the selection of fans under a single working condition, and it is difficult to compare and analyze the selection, and cannot solve the problem of working condition adjustment.

2) Use the fan performance curve to select the fan.

This method is the same as the selection of a pump using the pump performance curve, which is the most basic and relatively simple method. This method is convenient for the analysis of working condition adjustment and the determination of adjustment parameters. The comparative selectivity of the performance curve is poor.

3) Use the dimensionless performance curve of the fan to select the fan.

The dimensionless performance curve of the fan is the dimensionless performance parameter representing the series of fans of various types and different machine numbers. In order to narrow down the range of options, first select the speed of the fan (if possible, try to choose a higher speed, but the boiler induced draft fan and dust exhaust fan should consider the wear problem of high speed). The specific number of revolutions of the fan is calculated by the fan selection parameters and equation ( ) or equation ( ).

Then find the dimensionless curve of the centrifugal fan by the value, and find the fan that is closest to the calculation ratio revolution and has high efficiency as the selected fan type.

It is determined that the blower or induced draft fan can be used to select the required fan according to the air volume, wind pressure and medium.

It depends on how much time is required for space and traffic.

1) First, the amount of gas that needs to be treated is determined by calculation. When the gas temperature. When the density, water vapor content, etc. changes greatly, the amount of gas should be converted in order to determine the diameter of the dust collector.

2) Determine the inlet airflow velocity of the dust collector according to the amount of gas to be processed. Then determine whether the cyclone dust collectors are used in parallel.

3) Calculate the dust particle size of the separation interface and the expected dust removal efficiency of the dust collector according to the given conditions. Or directly select according to the table of "main technical performance of cyclone dust collector"; Or check the performance data against the calculation results.

4) The dust collector must be equipped with a dust discharge valve with good air tightness to prevent air leakage in the lower part of the dust collector body and ensure the dust removal effect.

5) When used in parallel, the cyclone dust collector must be of the same model and specification, and the connecting air duct needs to be reasonably designed to make the amount of gas processed by each dust collector equal, so as to avoid the cascade phenomenon between the dust collectors and reduce the dust removal efficiency.

The volume of the cyclone dust collector and purifier should be consistent with the actual amount of dusty gas that needs to be treated. When selecting the diameter of the dust collector, it should be as small as possible, and if the air volume required to pass through is large, it is advisable to use several small diameter cyclone dust collectors in parallel; If the air volume is consistent with the multi-tube cyclone dust collector, it is advisable to choose a multi-tube dust collector.

According to the principle of action, dust collectors can be divided into the following types:

1. Dry mechanical dust collector mainly refers to the dust removal equipment designed by the application of dust inertia and gravity, such as high-concentration dust collectors such as settling chambers, inert dust collectors, cyclone dust collectors, etc., which are mainly used for the separation or concentration of high-concentration coarse particle size dust.

2. Wet dust collectors rely on hydraulic affinity to separate and capture dust particles, such as spray towers, scrubbers, impact dust collectors, venturi tubes, etc., which are used more in the treatment of dusty gases with high concentration and large air volume in the process of treatment. The separation efficiency of coarse, hydrophilic dust is higher than that of dry mechanical dust collectors.

3. The particle layer dust collector uses the granular material accumulation layer of different particle sizes as the filter material to block and filter the dust contained in the air dissolution. It is mainly used in the dust removal point in the production process of building materials and metallurgy, and is often used to filter dusty flue gas with high concentration, coarse particles and high temperature.

4. Bag dust collector, the filter is a dust removal device with fiber weaving or filling layer as the filter medium, and its use, form, dust removal air volume scale and function efficiency have a wide range in all aspects, mainly used in the place of collecting fine dust, that is, it is applied in the exhaust dust removal system and the air intake system. In recent years, due to the continuous development of new filter media, the development of fiber filtration technology has also accelerated, new products continue to appear, and the application field has been increasingly expanded.

5. The electrostatic precipitator is to introduce the dust-containing air flow into the electrostatic field, under the action of the high-voltage electric field, the gas is ionized, electrons and positive ions are generated, they move to the positive and negative poles respectively, when the dust particles are negatively charged when flowing through the working electric field, they move to the sedimentation plate opposite to the sign of their negative charge at a certain speed, and settle down there, so as to break away from the air flow and be collected in the electrostatic precipitator. This kind of dust collector has high dust removal efficiency, low resistance, and easy maintenance and management. It is similar to baghouse in capturing fine dust particles.

There are mainly the following classifications:

1. Mechanical dust removal equipment: mechanical dust removal equipment includes gravity dust removal equipment, centrifugal dust removal equipment and inertial dust removal equipment.

2. Washing dust removal equipment: washing dust removal equipment includes water bath dust removal equipment, foam dust removal equipment, venturi dust removal equipment, water film dust removal equipment, etc.

3. Filtered dust removal equipment: The dust removal mechanism of the filtering dust removal equipment is similar to that of a mask, which is achieved by the mechanical interception of fly ash particles in the air by the filter material, and the fly ash particles received first form a viscous and stable ash layer on the surface of the filter material, which is called filter cake or bed, which plays a good role in filtration.

4. Electrostatic precipitator equipment: The working principle of electrostatic precipitator equipment is that when the flue gas passes through the flue in front of the main structure of the electrostatic precipitator equipment, the smoke and dust will be positively charged, and then the flue gas will enter the channel of the electrostatic precipitator equipment with multi-layer cathode plates.

5. Magnetic dust removal equipment: The principle of magnetic dust removal equipment is to use conductive coils to generate magnetic fields and adsorb magnetic particles, which are mainly used for industrial waste gases such as steel.

The dust collector is the equipment that separates the dust from the flue gas, if it is used in industry, the electric bag composite dust collector is better.

Generally, there are three types of bag dust collectors, filter cartridge dust collectors, and cyclone dust collectors.

Hello, there are bag dust collectors, electrostatic precipitators, wet electrostatic precipitators, electric tar precipitators, Hebei Beijing dust removal, thank you.

Aunason Environmental Protection is a domestic company that makes dust collector equipment. Committed to passing the environmental impact assessment of enterprises.

Dust collector equipment:

The dust removal efficiency is high, generally more than 99%, and the dust concentration of the outlet gas of the dust collector is within tens of mg m3, which has a high classification efficiency for fine dust with sub-micron particle size.

The range of air volume is wide, the small one is only 1 min m3, and the large one can reach 1 min tens of thousands of m3, which can be used for flue gas dust removal in industrial furnaces and kilns to reduce the emission of air pollutants.

The structure is simple, and the maintenance and operation are convenient.

On the premise of ensuring the same high dust removal efficiency, the cost is lower than that of electrostatic precipitators.

When using high-temperature resistant filter materials such as glass fiber, PTFE, P84, etc., it can operate under the condition of more than 200 high temperatures.

It is not sensitive to the characteristics of dust, and is not affected by dust and resistance.

Personal suggestion: In this regard, I suggest you look for manufacturers in the Kunshan area, Aunason Environmental Protection Company focuses on waste gas treatment and provides one-stop solutions, you can consider it.

1. Bag type dust collector.

The dust removal efficiency is high, and the efficiency of fine dust can reach more than 99%.

It is not suitable to purify dusty gases containing oil mist, condensate and dust with large adhesion, as well as flue gases that are dangerous or have sparks.

When the dust concentration is greater than 10g m3, it is advisable to add a pre-purification dust collector.

The recommended flow rate for baghouses is as follows:

The main properties of various fibers are shown in the table.

The baghouse is a dry and high-efficiency dust collector that uses the filtration action of a porous bag-shaped filter element for dust removal. Because it has the advantages of high dust removal efficiency (for dust, the efficiency is as high as 98% 99%), strong adaptability, flexible use, simple structure, stable operation, easy dust, simple maintenance and so on. Therefore, bag filters are widely used in different industrial sectors such as metallurgy, chemistry, ceramics, cement, food, etc., and are the most competitive dust removal equipment among various high-efficiency dust collectors.

The working principle of the bag filter: the mesh of the filter material used in the bag filter is large, generally 20 50um, and the surface fluffing filter material is about 5 10um. Therefore, the dust removal efficiency of the new filter bag is only about 40% (1um dust).

When the dust-laden air passes through the filter material, due to the action of fiber screening, interception, collision, diffusion and static electricity, the dust is retained on the filter material to form a primary layer.

Compared with the filter media, the porous initial layer has a higher dust removal efficiency. Therefore, the filtration function of the baghouse mainly relies on this initial layer and the dust layer that gradually accumulates later. As the dust layer thickens, the pressure difference between the two sides of the filter bag becomes larger, which increases the resistance loss of the dust collector and reduces the amount of gas processed.

At the same time, due to the acceleration of the speed of air passing through the pores of the filter material, the dust removal efficiency is reduced.

Therefore, after the dust collector runs for a period of time, the dust is cleaned to remove the dust layer, but the initial layer is not damaged, so as not to reduce the efficiency.

2. Filter cartridge dust collector.

The cartridge is sub-micron filtered to create a clean space.

Automated off-line cleaning.

Local collection, local processing.

Convenient operation and maintenance.

It is suitable for the collection of dust from a variety of independent or multiple dust generation points.

The working principle of the filter cartridge dust collector: after the fan is opened, the dusty air enters the box from the dust source through the dust removal cover, air duct and air inlet, due to the sudden expansion of the air flow, the flow rate decreases suddenly, and the large particles are separated from the dusty air by the powder under its own weight and sinks into the ash drawer, and the rest of the dust particles are retained on the outer wall of the filter element due to the role of screening, collision, hooking, static electricity, etc., and the purified air is discharged from the outlet through the fan.

For wet precipitators, electrostatic precipitators can also be used in the dust collection system of pharmaceutical factories, but they are rarely used in actual production. Therefore, for the dust removal system of pharmaceutical factories, the above two dust collectors are commonly used.

Dust collectors are divided into the following five categories according to their principle of action:

1) Mechanical dust collectors include gravity dust collectors, inertial dust collectors, centrifugal dust collectors, etc.;

2) Washing dust collectors include water bath dust collectors, foam dust collectors, venturi dust collectors, water film dust collectors, etc.; (3) Filter-type dust collectors include bag dust collectors and particle layer dust collectors, etc.;

4) Electrostatic precipitator;

5) Magnetic dust collector.

Dust collectors are divided into the following according to the dust removal method:

1) Dry dust collector;

2) Semi-dry dust collector;

3) Wet dust collector.

Dust collectors are now used more in the industry, such as electric bag composite dust collectors and bag filters.

According to the principle of filtration, it is divided into: 1. Electrostatic precipitator: a precipitator designed according to the corona of dust.

2. Bag filter: according to the principle of dust capture, the dust is filtered by the filter bag. It is divided into mechanical ash cleaning, atmospheric backblowing, pulse cleaning, sound wave and other ash cleaning dust collectors.

3. Inertial dust collector: baffle dust collector designed according to the inertia of dust 4. Cyclone dust collector: dust collector designed according to the centrifugal force of dust, and there are many types of dust collector 5. Wet dust collector: