Key points that cannot be ignored when purchasing a bag filter
Jun 26,2025
In the field of industrial dust removal, bag filters have become the choice of many enterprises due to their efficient filtration performance. However, the quality of products in the market varies greatly, and neglecting key factors when purchasing may lead to poor dust removal efficiency and increased operating costs. The following are the core points that must be paid attention to when choosing a bag filter, to help you select accurately.
1、 Core performance parameters: the cornerstone that determines the dust removal effect
1) Filtration efficiency and emission concentration: The filtration efficiency of bag filter directly affects the dust emission concentration, which is related to whether the enterprise can meet environmental standards. It is necessary to confirm whether the filtration efficiency of the equipment is ≥ 99%, especially focusing on its ability to filter fine dust such as PM2.5. At the same time, it is clear that the equipment meets the emission standards of the country or region where it is located, such as the EU's Industrial Emission Directive (IED), the US Environmental Protection Agency (EPA) requirements, etc., to avoid penalties for non-compliance with emissions standards.
2) Processing air volume: Accurately calculate the required processing air volume based on the actual dust production of the factory, ensuring that the equipment processing air volume is ≥ 1.2 times the actual dust production. If the air volume is insufficient, it will cause the dust collector to operate at overload, resulting in dust overflow; If it is too large, it will increase equipment investment and energy consumption costs.
Performance of the dust cleaning system: The dust cleaning system is the key to maintaining the efficient operation of the bag filter. Pulse jet cleaning system has fast response speed and good cleaning effect, suitable for most working conditions; Mechanical vibration cleaning causes significant wear on filter bags and requires careful selection. It is necessary to understand the spray pressure and frequency adjustment range of the dust cleaning system, as well as whether it has intelligent control functions, to ensure that the dust cleaning strategy can be automatically optimized based on dust characteristics and working conditions.
2、 Filter bag material and structure: key to adapting to working conditions
1) Material selection: Choose the filter bag material based on the physical and chemical properties of the dust. For high-temperature flue gas (>200 ℃), high-temperature resistant materials such as aramid and P84 can be used; Dealing with corrosive dust, polytetrafluoroethylene (PTFE) material has excellent acid and alkali resistance; In flammable and explosive environments, anti-static filter bags should be used. At the same time, the food and pharmaceutical industries must ensure that the filter bag material meets hygiene and safety standards.
2) Structural design: The sewing process of the filter bag and the reinforcement method of the bag mouth and bottom affect its service life. High quality filter bags are sewn with double threads, and the bag mouth is reinforced with elastic or steel rings, which can tightly fit the flower board and prevent air leakage; The bottom of the bag is designed to be thick and wear-resistant, reducing friction with the ash hopper. In addition, the number and depth of folds in the filter bag affect the filtration area, and a reasonable structural design can improve filtration efficiency in a limited space.
3、 Supplier's comprehensive strength: ensuring the full cycle operation of equipment
1) Qualification and Certification: Choose suppliers who have obtained international authoritative certifications (such as CE, ISO 9001, ISO 14001) to ensure that equipment quality and production management comply with international standards. At the same time, verify the relevant patent technologies and industry honors of suppliers to understand their technological research and development capabilities.
2) Industry cases and reputation: Refer to successful cases of suppliers in the same industry to understand the operational stability and dust removal effect of equipment under actual working conditions. Evaluate the product quality, delivery time, and service attitude of suppliers through industry forums, customer reviews, and other channels, and prioritize selecting companies with good reputations.
4、 Cost accounting: Balancing initial investment and long-term operation
1) Equipment procurement cost: When comparing quotes from different suppliers, one should not only focus on the initial price of the equipment, but also understand the differences in configuration. Some low-priced equipment may use low-quality accessories on key components such as filter bag materials and cleaning systems, resulting in increased maintenance costs in the later stage.
2) Operation and maintenance costs: Considering the energy consumption of the equipment, low resistance design and efficient dust cleaning system can reduce fan power and save electricity costs; The service life of filter bags directly affects maintenance costs. Although high-quality filter bags are purchased at a high price, the replacement cycle is long and the overall cost is lower. In addition, it is necessary to estimate the cost of replacing vulnerable parts and manual maintenance of the equipment.
Purchasing a bag filter is a decision that requires comprehensive consideration, from core performance parameters to supplier services, each key point is related to the actual use effect of the equipment and the economic benefits of the enterprise. Only through comprehensive evaluation and careful selection can we choose dust removal equipment that is suitable for working conditions, efficient and reliable, and provide strong support for the green production and sustainable development of enterprises.
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