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The core logic for selecting dust removal equipment is "matching working condition requirements + meeting emission standards + considering operating costs". A wrong selection will not only lead to substandard dust removal efficiency and high equipment failure rates, but also cause a waste of energy consumption and maintenance costs. The following is an elaboration from 10 core points, covering the key dimensions of the entire selection process:
- Refers to the total flow of dust-laden gas that needs to be treated by the dust removal equipment, with the unit being m³/h.
- It needs to be comprehensively calculated based on the exhaust volume of production equipment, the number of workshop air changes, the air leakage rate of pipelines, etc. Excessively large air volume may cause energy waste, while excessively small air volume cannot effectively capture dust.
- The mass of dust in a unit volume of dust-laden gas, with the unit being g/m³ or mg/m³.
- For high-concentration dust (such as >20g/m³), pre-dust removal devices (such as cyclone dust collectors) should be considered to avoid directly entering high-precision dust removal equipment, which may cause filter material blockage or electrode pollution.
- Temperature: For high-temperature dust (such as >120℃), high-temperature resistant filter materials (such as glass fiber, aramid) or cooling devices should be selected; low-temperature and high-humidity dust is prone to condensation, so thermal insulation or heating measures should be considered.
- Humidity: High-humidity dust (relative humidity >80%) is easy to agglomerate. Bag filters (filter bags are easy to get pasted) should be avoided, and wet or cyclone dust collectors can be preferred.
- Floor area: For workshops with limited space, vertical structures (such as cartridge dust collectors) or compact bag filters can be selected; for sufficient space, horizontal or combined systems can be considered.
- Installation height: It needs to meet the space requirements for fans, pipelines and equipment maintenance, and also consider the load-bearing capacity of the factory building.
The characteristics of dust directly determine the adaptability of dust removal equipment, and the following points should be focused on:
- Coarse dust (particle size >10μm): Cyclone dust collectors and gravity settling chambers can meet the requirements with low cost.
- Fine dust (particle size 1-10μm): Bag filters and cartridge dust collectors can achieve an efficiency of over 99%.
- Ultrafine dust (particle size <1μm): Electrostatic precipitators, wet electrostatic precipitators or high-efficiency bag filters (equipped with membrane filter materials).
- High-viscosity dust (such as cement, putty powder): It is easy to agglomerate on filter materials or pipelines. Wet dust collectors and cyclone dust collectors are preferred, while bag filters (which require frequent cleaning) should be avoided.
- Corrosive dust (such as acid mist, alkali dust): Anti-corrosion materials (such as PP, stainless steel, glass fiber reinforced plastic) should be selected, and filter materials can be corrosion-resistant materials such as FMS and PTFE.
- For example, aluminum powder, magnesium powder, coal powder, etc., **explosion-proof dust removal equipment** should be selected, equipped with anti-static filter materials, explosion relief devices, flame arresters, etc. At the same time, the wind speed and dust concentration in the equipment should be controlled to avoid static accumulation.
- It must comply with national and local industry emission standards (such as "Integrated Emission Standard of Air Pollutants" GB16297-1996, and exclusive emission standards for various industries).
- If the emission requirements are strict (such as <10mg/m³), high-efficiency dust removal equipment (such as membrane-coated bags, electrostatic precipitators, wet electrostatic precipitators) should be selected.
- If the dust-laden gas is accompanied by harmful gases (such as SO₂, NOₓ), combined treatment processes (such as dust removal + desulfurization and denitrification integrated equipment) should be considered.
Different types of dust removal equipment have significant differences in applicable scenarios, and should be selected according to the above working conditions and dust characteristics. The comparison and selection suggestions of common equipment are as follows:
| Equipment type | Core advantages | Applicable scenarios | Limitations |Cyclone dust collector | Low cost, low resistance, simple maintenance | Pre-dust removal for coarse dust, pre-treatment for high-concentration dust | Low removal efficiency for fine dust (<60%) |
| Bag filter| High efficiency (>99%), strong adaptability | Most industrial dust, fine/ultrafine dust | High-humidity and high-viscosity dust is easy to paste the bag, and filter materials need to be replaced regularly |Cartridge dust collector | Small size, high efficiency, good ash cleaning effect | Workshop station dust removal, small air volume fine dust | Large air volume conditions require multiple units to be combined, with high cost |Electrostatic precipitator | Large air volume, low resistance, no consumables | Large air volume and low concentration dust in thermal power, metallurgy, etc. | Sensitive to dust specific resistance, large equipment volume, high initial investment | Wet dust collector| Friendly to high-humidity, high-viscosity/flammable and explosive dust | High-humidity and high-viscosity dust in chemical industry, foundry, mining, etc. | Produces sewage that needs to be treated, and is easy to freeze in winter |
Selection should not only consider the initial investment, but also pay attention to the whole life cycle cost:
- Fan power is the main source of energy consumption. A suitable fan should be selected according to the equipment resistance; the energy consumption of electrostatic precipitators increases significantly with the increase of processing air volume, and the resistance of bag filters increases with the degree of filter material blockage.
- The filter bags of bag filters and the filter cartridges of cartridge dust collectors are core consumables. Their service life is affected by dust properties and ash cleaning frequency, generally 1-3 years; electrostatic precipitators have no consumables, but electrodes need to be cleaned regularly.
- Priority should be given to equipment with simple structure and easy disassembly. For example, the replacement of filter cartridges in cartridge dust collectors is more convenient than that of filter bags in bag filters; wet dust collectors need to clean the sedimentation tank regularly, with a large amount of maintenance work.
- Fan: It needs to match the resistance and processing air volume of the dust removal equipment, and high-efficiency and energy-saving fans (such as permanent magnet variable frequency fans) are preferred.
- Ash discharge device: Select screw conveyors, star-shaped ash discharge valves, scraper conveyors, etc. according to the dust amount to ensure smooth ash discharge and avoid secondary dust.
- Pipeline system: Reasonably design the pipeline diameter and wind speed to avoid pipeline blockage or dust accumulation. Wear-resistant linings can be set at elbows.
- A PLC control system can be configured according to needs to realize functions such as automatic adjustment of ash cleaning cycle, monitoring of equipment operation status, and fault alarm, so as to reduce manual operation intensity and improve operation stability.
The working conditions of most industrial scenarios are non-standard, requiring manufacturers to provide customized designs:
Such as multi-point air intake of dust-laden gas, bypass cooling of high-temperature gas, etc.
Such as high-temperature resistant, corrosion-resistant, anti-static, water-repellent and oil-proof functional filter materials.
Such as dust removal + material recovery integrated equipment, suitable for the recovery and utilization of precious metal dust or raw material dust.
