Dust collector selection requires comprehensive consideration of multiple factors and parameters.  Here are some key points:

I. Core Parameters

Processing Air Volume

The volume of dust-laden gas to be processed per unit time (m³/h or m³/min) is a critical parameter in determining the dust collector specifications. It should be determined based on the rated exhaust volume of the process equipment, the pipeline leakage coefficient (usually 10%-15%), and a reserve margin for future capacity (10%-20%) to ensure the equipment can handle peak airflow.

Dust Characteristics

Particle size distribution: Fine dust (such as high proportion of PM2.5) requires the use of ultra-fine fiber membrane filter materials; when coarse particles are predominant, a pre-dust collector (such as a cyclone dust collector) can be considered to reduce the burden on the main dust collector.

Viscosity and humidity: Viscous dust (moisture content >10% or forms clumps when squeezed) requires the use of membrane filter materials and offline pulse cleaning; high-humidity gases require anti-condensation design (such as insulation layers, electric heating).

Corrosiveness and explosiveness: When containing corrosive gases such as SOx and NOx, the casing material needs to be upgraded to 304 stainless steel or carbon steel + epoxy anti-corrosion coating; explosive dust (such as aluminum powder, coal dust) requires explosion relief devices and anti-static filter bags.

Gas Temperature and Humidity

Temperature: The temperature resistance of the filter material should be at least 20℃ higher than the maximum flue gas temperature (e.g., 180℃ flue gas requires a filter material with a temperature resistance of over 200℃). For normal temperature conditions (<130℃), polyester needle felt is selected; for medium temperatures (130-200℃), PPS or aramid materials are preferred; for high temperatures (>200℃), P84 or glass fiber membrane filter materials are required.

Humidity: When the relative humidity is >85% or contains saturated water vapor, enhanced insulation and anti-condensation measures are necessary.

II.Emission Requirements

Determine the target emission concentration based on national, local, or industry emission standards (e.g., ≤10mg/m³ or ≤20mg/m³), and accordingly select the filter material grade, filtration velocity, and cleaning method. II. Key Selection Parameters

Filtration Velocity

For normal temperature dry dust, use 1.0-1.5 m/min; for high-temperature viscous dust, use 0.8-1.2 m/min; for reverse-air cleaning, do not exceed 0.8 m/min. Filtration velocity directly affects equipment volume, resistance, and filter bag lifespan.

Cleaning Method

Pulse jet cleaning: High cleaning efficiency, suitable for high-concentration, large-volume airflow conditions, requires a compressed air system.

Mechanical shaking: Low energy consumption, suitable for small equipment or dry, loose dust.

Reverse-air cleaning: Less wear on filter bags, suitable for low-concentration, fine dust.

Equipment Structure and Materials

The casing material should be selected based on the corrosiveness of the gas (e.g., 304 stainless steel or carbon steel + anti-corrosion coating).

The hopper inclination angle should be ≥60° (≥65° for viscous dust), and equipped with a shaking device and discharge valve to ensure smooth dust discharge.

III. Selection Considerations

Reserve Capacity: A 10%-15% reserve capacity should be included in the processing airflow to prevent exceeding emission limits during load fluctuations.

Air Source Quality: The compressed air for pulse jet cleaning needs to be oil-free and water-free to prevent filter bag clogging.

Total Life Cycle Cost: Consider equipment purchase, filter bag replacement, energy consumption, and maintenance costs to avoid excessively high operating and maintenance costs due to low-priced equipment.

Based on the above parameters and considerations, the appropriate type of dust collector (such as bag filter, cyclone separator, electrostatic precipitator, etc.) can be selected based on specific working conditions to ensure efficient and stable operation and meet environmental requirements.