High-temperature filter bags are key equipment in modern chemical production. Made from special heat-resistant fiber materials, they maintain stable physical and chemical properties even in extreme temperatures. Their primary function is to efficiently filter high-temperature gases or liquids, removing solid particles, dust, and harmful substances. They are widely used in chemical production, encompassing waste gas treatment, catalyst recovery, and product purification, improving production efficiency and environmental performance. Compared to traditional filtration equipment, they can meet the demands of demanding operating conditions such as high temperature, high pressure, and strong corrosive environments, providing businesses with greater operational convenience and cost-effectiveness, helping them optimize processes, save energy, and reduce emissions, in line with sustainable development trends.
Common Applications in the Chemical Industry
- Fertilizer Production
The fertilizer production process generates a large amount of dust. Filter bags can effectively capture this dust and prevent environmental pollution.
- Pharmaceutical Industry
Product purification is an essential step in fine chemical and pharmaceutical production. High-performance, high-temperature filter bags can effectively remove impurities during this process, ensuring the quality of the final product.
- Waste gas treatment
In coal-fired power plants and waste incineration plants, high-temperature flue gas contains a large amount of fine particles and toxic gases. High-efficiency dust filter bags can capture these particles while allowing clean gas to pass through, thereby significantly reducing emission pollution.
- Petrochemical and Refining Industry
Oil processing may generate fumes and other harmful gases. Filter bags can effectively reduce air pollution. In an oil cracking unit, catalyst particles flow out of the reactor along with the hot oil and gas mixture. By installing high-performance filter bags, these particles can be precisely separated for subsequent reuse.
Main materials and characteristics
Polytetrafluoroethylene (PTFE) Filter Bags
- Polytetrafluoroethylene (PTFE) Filter Bag
- Material: PTFE needle-punched felt
- Temperature range: -200°C to +260°C
- Chemical stability: Almost impervious to all chemicals
- Tensile strength: Approximately 45 MPa.
- Filtration Precision: 0.5-1 μm.
Features
- Smooth surface and excellent self-cleaning properties, suitable for frequent cleaning.
- Low coefficient of friction and excellent wear resistance.
- Manufacturing cost is relatively high, primarily used in high-end applications such as pharmaceuticals and food processing.
Fiberglass Filter Bags
- Material: Glass fiber needle-punched felt.
- Temperature resistance: Up to 450°C.
- Tensile strength: Approximately 800 MPa.
- Elastic modulus: Approximately 70 GPa.
- Filtration Precision: 1-5 μm.
Features
- Excellent mechanical strength and high-temperature resistance, with strong resistance to acid and alkali corrosion.
- A special coating enhances water resistance and antistatic properties, making it suitable for high-temperature flue gas treatment in coal-fired power plants, cement plants, and other applications.
- Poor flexibility and prone to breakage; avoid severe vibration or bending.
Aramid(Nomex) Filter Bags
- Material: Aramid needle felt.
- Temperature resistance: 220°C to 260°C.
- Tensile strength: Approximately 2.5 GPa.
- Density: Approximately 1.44 g/cm³.
- Filtration Precision: 2-10 μm.
Features
- High strength, lightweight, excellent thermal stability, and flame retardancy, capable of withstanding short-term, high-temperature shocks.
- High air permeability and low pressure drop make it an excellent choice for ventilation systems.
- Dimensionally stable, but sensitive to certain strong oxidants; operating conditions should be considered when selecting.
Composite Filter Bags
- Material: Glass Fiber + PTFE.
- Temperature Range: Adjustable by formulation.
- Overall Performance: High strength, corrosion resistance, and easy cleaning.
Features
- Combined from multiple materials, such as glass fiber and PTFE, these bags combine the advantages of each material.
- Performance parameters can be customized through impregnation, coating, or braiding.
- Although they may be more expensive, they offer excellent overall performance and are suitable for high-end filtration applications.