What is a Bag Filter Housing?
A bag filter housing is a common industrial filtration device primarily used for solid-liquid or solid-gas separation. It captures solid particles in fluids (liquids or gases) through filter bags (made of fibrous materials), thereby achieving purification or recovery. Below is a detailed introduction to its core features and working principles:
- Basic Structure
- Filter Bag: The core filtration element, typically made of polyester, nylon, polypropylene, etc., with precision ranging from 1 micron to 200 microns, selectable based on particle size.
- Filter Basket/Support Mesh: Made of metal or plastic, it supports the filter bag to prevent collapse.
- Housing: Usually constructed from stainless steel or carbon steel, designed for pressure resistance, available in side-entry or top-entry configurations.
- Sealing Ring: Ensures system tightness to prevent leakage.
- Drain Port: Used to discharge impurities or clean the filter bag.
- Working Principle
- Filtration Process: Fluid enters the filter through the inlet, solid particles are trapped by the filter bag, and clean fluid passes through the bag and exits via the outlet.
- Cleaning/Replacement: When pressure drop increases (indicating clogging), manual or automatic backwashing/replacement of the filter bag is required.
- Main Types
- Single Bag filter housing: Suitable for small-scale applications, cost-effective.
- Multi-Bag filter housing: Designed for high-flow scenarios, multiple filter bags can be connected in parallel.
- Self-Cleaning Type: Equipped with reverse air blowing or vibration mechanisms for automatic dust removal (commonly used in gas filtration).
- Applications
- Liquid Filtration:
- Chemical industry: Removal of catalysts, resin particles.
- Electroplating: Recovery of precious metal powders.
- Food & Beverage: Filtering impurities to ensure hygiene.
- Advantages
- High Efficiency: Capable of capturing fine particles with high filtration precision.
- Flexibility: Various filter bag materials available (acid-resistant, high-temperature resistant, etc.).
- Low Cost: Easy maintenance with affordable filter bag replacement.
- Eco-Friendly: Useful particles can be recovered, reducing waste.
- Key Selection Factors
- Flow Rate: Housing size depends on processing capacity.
- Particle Size: Match filter bag precision (e.g., 10μm, 50μm).
- Fluid Properties: Corrosive fluids require PP or stainless steel materials.
- Operating Pressure: Standard designs usually handle ≤1.0MPa; special designs needed for higher pressures.
- Maintenance Notes
- Regularly monitor pressure drop to avoid filter bag rupture.
- Thoroughly clean during shutdown to prevent media hardening.
- Avoid overpressure or high temperatures that may damage the filter bag.
Due to its simplicity and reliability, bag filter housings are widely used in industries such as chemicals, pharmaceuticals, and environmental protection, serving as key equipment for pre-treatment or fine filtration. For more specialized selection advice, specific operating conditions (e.g., viscosity, temperature, particle concentration) must be considered.
Contact us today for a free consultation!
Julie
Email: sales@filtrationchina.com
Mobile / WA / WeChat / Line / Viber: +86 159 2865 0174
