Dust removal equipment matching filter bag: Practical guide for high-temperature and corrosion-resistant dust removal bags
Apr 25,2026
The filter bag is the core supporting component of dust removal equipment, and its performance directly determines the dust removal efficiency and equipment service life. Among them, the high temperature and corrosion resistant dust removal bag is specially designed for high temperature and corrosive working conditions, and is suitable for the tail gas treatment needs of industries such as metallurgy, chemical engineering, and waste incineration.
1、 Core positioning: Suitable scenarios for high-temperature and corrosion-resistant filter bags
Conventional filter bags (such as polyester filter bags) have limited temperature and corrosion resistance, and cannot adapt to working conditions with high temperatures (>120 ℃), acid and alkali content, and corrosive gases. They are prone to problems such as carbonization, damage, and aging, leading to a decrease in dust removal efficiency and frequent replacement of filter bags. The high-temperature and corrosion-resistant dust removal bag, made of special materials and processes, can stably adapt to such complex working conditions, avoiding equipment failures and excessive emissions caused by filter bag damage. It is the core supporting component for high difficulty dust removal scenarios.
2、 Mainstream materials and core characteristics
The performance core of high-temperature and corrosion-resistant filter bags depends on the material. Common materials and adaptation points in foreign trade scenarios are as follows. There are no product recommendations, only practical selection references are shared:
1. Fiberglass filter bag: Temperature resistance range of 120-260 ℃, good acid and alkali resistance, suitable for medium high temperature and moderate corrosive working conditions, high cost-effectiveness, but the disadvantage is slightly poor wear resistance, not suitable for dust containing hard particles.
2. PTFE filter bag (polytetrafluoroethylene): Temperature resistance range -200-260 ℃, resistant to strong acids, alkalis, and oxidants, suitable for high corrosion and high temperature conditions, high filtration efficiency, not easy to bond, long service life, suitable for complex and harsh scenarios.
3. PPS filter bag (polyphenylene sulfide): with a temperature range of 120-190 ℃, excellent acid resistance, moderate alkali resistance, suitable for sulfur-containing dust working conditions such as coal-fired boilers and chemical industries, and better wear resistance than fiberglass filter bags. It is a commonly used choice for medium to high temperature acidic working conditions.
4. Fumes filter bag: made of glass fiber and PTFE composite, with a temperature resistance of 200-240 ℃, it has high temperature resistance, corrosion resistance and wear resistance, and is suitable for high-temperature corrosive dust containing hard particles, with a wider range of adaptability.
3、 Key points of selection
The selection should be accurately matched according to the working conditions to avoid damage to the filter bag due to material mismatch, with a focus on three points:
1. Temperature matching: Based on the inlet flue gas temperature of the dust removal equipment, select the corresponding temperature resistant filter bag to ensure that the actual temperature is 10-20 ℃ lower than the maximum temperature resistance of the filter bag, avoiding carbonization and damage to the filter bag.
2. Medium matching: Clarify the corrosive components in the flue gas. PPS and PTFE filter bags are preferred for acidic media, PTFE filter bags are preferred for strongly corrosive media, and fiberglass and fluoromethane filter bags can be selected for alkaline media.
3. Dust characteristics: For dust containing hard particles, PPS and Flumes filter bags with good wear resistance are preferred; PTFE coated filter bags are preferred for sticky dust to avoid dust adhesion and blockage of the filter bags.
4、 Key points for use and maintenance
Reasonable use and maintenance can extend the service life of filter bags and reduce operating costs. The core points are as follows:
1. Pre treatment protection: If the flue gas contains high humidity and high concentration corrosive substances, cooling and desulfurization devices should be installed in advance to reduce the corrosion of the filter bag and avoid the "sticking" and "brittleness" of the filter bag.
2. Dust cleaning regulation: Adjust the dust cleaning pressure and cycle according to the dust concentration and viscosity. High pressure can damage the filter bag, and long cycle can cause filter bag blockage. It is recommended to control the dust cleaning pressure at 0.3-0.5MPa.
3. Regular inspection: Check the surface wear, damage, and aging of the filter bag every month. If any damage is found, replace it immediately to avoid dust penetration and reduce dust removal efficiency; Regularly clean the surface area of the filter bag to prevent excessive accumulation of dust and further corrosion.
4. Storage and installation: Filter bags should be stored away from damp and corrosive environments, and avoid direct sunlight exposure; During installation, avoid scratching the filter bag with sharp objects, ensure a tight seal between the filter bag and the flower board, and prevent short circuits in the airflow.
5、 Core Summary
High temperature and corrosion-resistant dust removal bags are the core supporting components of dust removal equipment under high temperature and corrosive working conditions. The key to their selection is to match the working condition temperature, corrosive medium, and dust characteristics. Mainstream materials have their own suitable scenarios. For foreign trade enterprises, reasonable selection of filter bag materials and good daily maintenance can not only ensure the stable and efficient operation of dust removal equipment, meet environmental emission requirements, but also reduce the frequency of filter bag replacement and lower operating costs, which is a key link in dust removal under complex working conditions.
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