Dust Collector

Short Description:

A dust collector is a device that separates dust from flue gas, called a dust collector or dust removal equipment.

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The performance of the dust collector is expressed in terms of the amount of gas that can be handled, the resistance loss when the gas passes through the dust collector, and the dust removal efficiency. At the same time, the price, operation and maintenance costs, service life and difficulty of operation and management of the dust collector are also important factors to consider its performance. Dust collectors are commonly used facilities in boilers and industrial production.


A dust hood is set up in each place where dust is generated, and the dust-containing gas is transported to the dust removal device through the pipeline gas path. After gas-solid separation is performed, the dust is collected in the dust removal device, and the clean gas is introduced into the main pipe or The whole set of equipment that is directly discharged into the atmosphere is the dust removal system, and the dust collector is an important part of the system. From the perspective of ventilation and dust removal, dust is all small solid particles that can exist in the air in a floating state for a long time. It is a dispersion system called aerosol, in which air is the dispersion medium and solid particles are the dispersed phase. A dust collector is a device that separates such small solid particles from aerosols.

Selection basis:Dust Collector

The performance of the dust collector not only directly affects the reliable operation of the dust removal system, but also affects the normal operation of the production system, the environmental sanitation of the workshop and surrounding residents, the wear and life of the fan blades, and also involves the use of materials with economic value. Recycling issues. Therefore, dust collectors must be properly designed, selected and used. When selecting a dust collector, the primary investment and operating costs must be fully considered, such as dust removal efficiency, pressure loss, reliability, primary investment, floor space, maintenance management and other factors. Choose a dust collector.
1. According to the requirements of dust removal efficiency
The selected dust collector must meet the requirements of emission standards.
Different dust collectors have different dust removal efficiencies. For dust removal systems with unstable or fluctuating operating conditions, attention should be paid to the influence of flue gas treatment volume changes on dust removal efficiency. During normal operation, the efficiency of the dust collector is ranked as follows: bag filter, electrostatic precipitator and Venturi filter, water film cyclone, cyclone, inertial filter, gravity filter
2. According to gas properties
When choosing a dust collector, factors such as the air volume, temperature, composition, and humidity of the gas must be considered. Electrostatic precipitator is suitable for flue gas purification with large air volume and temperature <400 Celsius; bag filter is suitable for flue gas purification with temperature <260 Celsius,and is not limited by the size of flue gas. The bag filter can be used after cooling down; the bag filter is not suitable for the purification of flue gas with high humidity and oily pollution; the purification of flammable and explosive gas (such as gas) is suitable for the wet filter; the processing air volume of the cyclone Limited, when the air volume is large, multiple dust collectors can be used in parallel; when it is necessary to remove and purify harmful gases at the same time, spray towers and cyclone water film dust collectors can be considered.
3. According to the nature of dust
Dust properties include specific resistance, particle size, true density, scoop, hydrophobicity and hydraulic properties, flammability, explosion, etc. Dust with too large or too small specific resistance should not use electrostatic precipitator, bag filter is not affected by dust specific resistance; dust concentration and particle size have a significant impact on the efficiency of electrostatic precipitator, but the impact on bag filter It is not significant; when the dust concentration of the gas is high, a pre-dusting device should be installed before the electrostatic precipitator; the type, cleaning method and filtration wind speed of the bag filter depend on the nature of the dust (particle size, scoop); wet type Dust collectors are not suitable for purifying hydrophobic and hydraulic dust: the true density of dust has a significant impact on gravity dust collectors, inertial dust collectors and cyclone dust collectors; for newly attached dust, it is easy to cause cat knots on the working surface of the dust collector. Therefore, it is not suitable to use dry dust removal; when the dust is purified and meets water, it can produce flammable or explosive mixtures, and wet dust collectors shall not be used.
4. According to pressure loss and energy consumption
The resistance of the bag filter is larger than that of the electrostatic precipitator, but compared with the overall energy consumption of the filter, the energy consumption of the two is not much different.
5. According to equipment investment and operating costs
6. Requirements for water saving and antifreeze
Wet dust collectors are not suitable for areas lacking water resources; there is a problem of freezing in winter in northern areas, and wet dust collectors are not used as much as possible.
7. Requirements for dust and gas recycling
When the dust has recycling value, dry dust removal should be used; when the dust has high recycling value, a bag filter should be used; when the purified gas needs to be recycled or the purified air needs to be recycled, it should be used. High efficiency bag filter.

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