How to choose the right industrial dust collector

A dust collection hood is set up in each ash place, and the dust-containing gas is transported to the dust removal device through the pipeline gas path, in which the dust is collected in the dust removal device after the gas-solid separation is carried out, and the clean gas is introduced into the main pipe or directly discharged into the whole set of equipment into the atmosphere, that 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 solid small particles that can float in the air for a long time, and is a dispersion system, called aerosol, in which air is the dispersed medium and solid particles are the dispersed phase. A dust collector is a device that separates these small solid particles from aerosols.

1. Different capacities: industrial vacuum cleaners are used in the industrial field, usually with more garbage, so the capacity of the trash bin is larger when designed. Commercial vacuum cleaners, on the other hand, are much smaller.

2. Different materials: industrial vacuum cleaners on the barrel body are generally metal shells, while commercial vacuum cleaners are mostly made of polyethylene.

3. Different filters: The filtration accuracy of industrial vacuum cleaners is much more precise than that of commercial vacuum cleaners, and the filters used by various brands are also different.

5. Wind power: Wind power directly affects suction, and industrial vacuum cleaners require strong suction power because of the heavy garbage they clean. Commercial vacuum cleaners are often designed to have a relatively small suction power due to different application ranges.

6. Power selection: industrial vacuum cleaner uses 380V power supply because of its long use time; Commercial vacuum cleaners generally use 220V civil electricity due to their different use time and use environment.

This is not, according to the air volume and emission requirements to determine the appropriate, each enterprise is different, can not be partial to the whole to do the project, the dust collector is large first of all, the cost is high, followed by the large occupation of the place, the maintenance workload is large, undoubtedly each point has caused a huge burden to the owner of the enterprise.

Hebei Beijing Dust Removal Equipment: According to the site conditions, site environment, dust concentration and local requirements of the emission standards to choose.

1. Determination of filtration wind speed

Filtration wind speed is one of the key parameters of dust collector selection, should be determined according to the nature of dust or smoke in different applications, particle size, temperature, concentration and other factors, under normal circumstances, the inlet dust concentration is 15 30g m3, and the filter wind speed should not be greater than; The dust concentration at the inlet is 5 15g m3, and the filtration wind speed should not be greater than; The dust concentration at the inlet is 5g m3, and the filter wind speed should not be greater than that. In short, when selecting the filtration wind speed, in order to reduce the resistance of the equipment, the general filtration wind speed should not be too large.

2. Choose a good filter material:

JWST filter cartridge dust collector adopts PS or PSU polymer coated fiber filter material, when the filter gas is at room temperature or lower than 100, PS polymer coated fiber filter material is generally used, if used in high temperature occasions, PSU polymer coated fiber filter material should be used, if used in special occasions, it must be explained before ordering, and the filter material should be selected.

3. Understand the form of ash discharge:

JWST series filter cartridge dust collectors all use screw conveyor to discharge ash (1-5 rows of dust collectors use star discharger for ash discharge).

The selection of dust collector should consider a variety of factors and conditions, and the model can generally be selected according to the following principles.

1) Select according to the amount of gas processed.

The amount of gas to be processed is the decisive factor in determining the size and type of dust collector, when the gas volume is large, it is necessary to choose a dust collector that can handle the atmospheric volume, and it is often uneconomical to use multiple dust collectors to deal with small gas volume in parallel; For smaller gas volumes, it is more economical to use which type of dust collector is the easiest to meet the environmental protection requirements of dust source control and dust emission.

Since the impact of operation and environmental conditions is sometimes unpredictable after the dust collector enters actual operation, it is necessary to ensure that there is a certain margin or reserve some space that may increase the equipment when determining the capacity of the equipment.

2) The dispersion of dust is greatly affected by the dispersion and density of dust, so when choosing the type of dust collector, it is necessary to accurately grasp the dispersion of dust. If the particle size is more than 10um, the cyclone dust collector can be selected; If the particle size is mostly less than 1 m, the electrostatic precipitator and bag filter should be selected. When the dust dispersion is the same, the model is selected according to other requirements.

Usually refer to the common dust collector type and performance table for preliminary selection; Then it is determined according to other conditions and the type and performance of the commonly used dust collector.

Dust density also has a great impact on the dust collection performance of the dust collector, especially the gravity dust collector, inertial force dust collector and centrifugal force dust collector. A common point of all dust collectors is that the smaller the bulk density, the more difficult it is to separate and capture dust particles, and the more serious the secondary flying of dust, so special measures should be taken in operation and equipment structure.

3) Select according to the concentration of gas dust.

Generally speaking, for gravity, inertia and cyclone dust collectors, the inlet dust concentration is large, although the dust removal efficiency is very high, it is not possible to ensure that the outlet dust concentration meets the requirements, so the dust treatment effect can not be judged only from the dust removal efficiency. For wet dust collectors such as venturi scrubbers and jet scrubbers, it is advisable to have an initial dust concentration of less than 10g m3. For the bag filter, the lower the dust concentration, the better the dust removal performance; At higher initial concentrations, continuous cleaning is carried out, and the pressure loss and discharge concentration can also meet the environmental requirements.

When the initial concentration of dust-containing gas entering the electrostatic precipitator is less than 30g m3, it can be used directly without adding a pre-dust collector.

When choosing a dust collector, you should start with the following points: Different dust collectors have different dust collection efficiency. Dust removal efficiency will be affected by operating conditions, so when selecting a dust collector, it is necessary to consider whether the operation is stable or not, and the change in flue gas treatment capacity will also affect the dust removal efficiency.

Among the many dust collectors, the bag filter is the best dust collector, while the gravity dust collector is the lowest.

Factors such as air volume, temperature, composition, and humidity of the gas will affect the selection of dust collectors. Take the electrostatic precipitator as an example, which is suitable for flue gas purification with a large air volume and a temperature of <400. The bag filter is suitable for flue gas purification at a temperature of < 260, which is not limited by the amount of flue gas, and when the temperature is 260, the flue gas should be cooled down before it can be used.

Flammable and explosive gas purification (e.g. gas) is suitable for wet dust collectors. The cyclone dust collector has a limited air volume, and when the air volume is large, multiple dust collectors can be connected in parallel; When it is necessary to remove dust and purify harmful gases at the same time, a spray tower and cyclone water film dust collector can be considered.

The temperature control mainly depends on its industrial and mining, and the cloth selection has temperature control and corrosion resistance

When choosing a dust collector, you need to consider the following aspects: Dust collection efficiency of the dust collector (the dust collection efficiency of various dust collectors for dust of different particle sizes). Whether the selected dust collector meets the emission concentration specified in the emission standard.

Pay attention to the physical properties of dust (such as viscosity, resistivity, wettability, etc.) have a great impact on the dust removal efficiency; In addition, the dust removal efficiency of dust collectors with different particle sizes varies greatly. When the dust concentration of the gas is high, a low-resistance primary purification equipment should be set up in front of the electrostatic precipitator or bag filter to remove coarse dust, so that the equipment can play a better role. Gas temperature and other properties are also factors that must be considered when selecting dust collection equipment.

Handling of the captured dust. Factors such as the location of the equipment, the available space, environmental conditions, etc. One-time investment in equipment (equipment, installation, construction, etc.) as well as economic factors such as operating and maintenance costs.

Nowadays, it is difficult for many dust collectors to meet the environmental protection acceptance standards, generally when we choose the dust collector, we will give priority to the CCEP environmental protection product certification certificate unanimously recognized by the environmental protection expert group, and the third-party inspection agency testing and calibration meet the environmental protection standards to meet the environmental protection acceptance requirements.