Dust Collector Selection Basis

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 area and surrounding residents, the wear and life of the fan blades, and also involves the use of economically valuable materials. Recycling issues. Therefore, dust collectors must be properly designed, selected and used. When choosing a dust collector, it is necessary to fully consider the primary investment and operating costs, 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. The electrostatic precipitator is suitable for flue gas purification with large air volume and temperature <400℃; the="" bag="" filter="" is="" suitable="" for="" flue="" gas="" purification="" with="" temperature=""><260℃, and="" is="" not="" limited="" by="" the="" size="" of="" the="" flue="" gas.="" when="" the="" temperature="" is="" ≥260℃,="" the="" 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.="">< p="">

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.