In industrial high-temperature dust removal applications, the choice of filter bag materials directly affects the stability, service life and operating cost of the dust removal system. Currently, the most widely used high-temperature filter bag materials include PPS (polyphenylene sulfide), P84 (polyimide), glass fiber, and FMS (FMS). These materials have their own advantages and applicable scenarios. Understanding the differences between them will help to select more scientifically.
First of all, in terms of temperature resistance, these four materials have strong high-temperature adaptability. The continuous working temperature of PPS is approximately between 160℃ and 190℃, which is suitable for medium and high temperature conditions; P84 can work for a long time at around 220℃ and can withstand 260℃ for a short time; glass fiber has the best temperature resistance and can operate stably between 250℃ and 280℃, and the instantaneous temperature can even reach above 300℃; FMS is a composite of multiple high-temperature fibers, with better temperature resistance than PPS and slightly lower than P84, and usually operates stably for a long time within 240℃.
The second is the difference in chemical corrosion resistance. PPS has excellent acid and alkali resistance, but is more sensitive to strong oxidants (such as NOx, O₂), and is easily oxidized and degraded under high oxygen concentrations. P84 has strong oxidation and acid resistance, and is suitable for environments containing corrosive gases such as SO₂ and NOx in flue gas. Glass fiber itself has strong resistance to high temperature and chemical corrosion, but its structure is brittle and not resistant to folding, and is sensitive to mechanical impact of vibration and back-blowing cleaning systems. Since FMS is a composite of glass fiber and aramid or other high-temperature fibers, its corrosion resistance and structural strength are better than those of a single glass fiber material, and it has a wider range of adaptability in a changeable and complex flue gas environment.
In terms of mechanical strength and folding resistance, PPS and P84, as synthetic fibers, have good flexibility and folding resistance, and are suitable for pulse jet cleaning and other working conditions that require high fatigue strength of filter bags. Glass fiber is easy to break and damage, and is not suitable for frequent vibration or high-speed airflow flushing; but its high-temperature stability is excellent, and it is suitable for systems with extremely high temperatures but low cleaning frequencies. Fluoromex filter bags combine the heat resistance of glass fiber and the flexibility of aramid fiber. They are not only heat-resistant, but also resistant to bending and tearing. They are suitable for most cleaning methods and have a long service life.
In terms of service life and cost-effectiveness, PPS is widely used in medium-high temperature and moderately corrosive working conditions due to its moderate price and stable performance. Although P84 has excellent performance, it is more expensive and is suitable for environments that require high filtration accuracy or extremely corrosive flue gas. The cost of glass fiber filter bags is relatively low, but the replacement cycle is short. In addition, the requirements for installation and use environment are high, and the overall cost-effectiveness is not always optimal. Fluoromex is considered to be one of the most cost-effective high-temperature filter bags due to its high stability and wide applicability brought by its composite structure, especially in complex working conditions such as garbage incineration, coal-fired boilers, and cement kiln tails.
Finally, it should be mentioned that the actual selection should also be considered in combination with factors such as the type of dust removal equipment, cleaning method, dust characteristics, and operation cycle. For example, pulse bag dust collectors should use PPS or FEMES materials with strong folding resistance; for high-temperature and highly corrosive combustion exhaust, P84 or PTFE is more recommended; if the equipment design is simple and the operating budget is limited, glass fiber may also be an economical transitional choice.
In summary, PPS, P84, glass fiber and FEMES have their own characteristics and cannot be simply evaluated as "good or bad". Only by truly understanding the on-site working conditions and matching the material properties can we select economical and efficient filter bag materials to ensure the long-term and stable operation of the dust removal system.