High Filtration Precision Bag Filter

The high filtration precision bag filter is a highly efficient solid-liquid separation device widely used in industrial production, environmental engineering, food and beverage processing, pharmaceuticals, water treatment, and other fields. It operates by utilizing a filter bag as its core component to intercept solid particles, suspended matter, bacteria, colloids, and other impurities on the surface or within the bag, thereby achieving purification purposes.

 

I. Structural Components

The high filtration precision bag filter primarily consists of the following parts:

1. Housing

Typically made of stainless steel (e.g., 304, 316L) or other corrosion-resistant materials, ensuring the stability and durability of the equipment. The housing features an inlet for the liquid or gas to be treated, an outlet for the filtered medium, a drain port, and openings for fixing and replacing the filter bag.

2. Filter Bag

The filter bag is the heart of a bag filter, available in various materials such as polypropylene (PP), polyester (PE), nylon, polytetrafluoroethylene (PTFE), metal mesh, and more, tailored to different application requirements. Filter bags offer a wide range of filtration precision, from a few microns to several hundred microns, and even down to sub-micron levels. An internal support skeleton is incorporated into the bag to enhance its mechanical strength and maintain a stable filtration area.

3. Sealing Devices

These include O-rings, compression rings, clamps, etc., which ensure airtight seals between the filter bag and housing, preventing leakage of the medium being filtered.

4. Support Basket/Frame

This component secures the filter bag in place, maintaining stability during filtration and facilitating installation and replacement.

5. Vent Valve/Relief Valve

The bag filter is equipped with a vent valve or relief valve to discharge air or overpressure within the housing during startup or filter bag changes, ensuring safe operation.

 

II. Working Principle

The high filtration precision bag filter's operation involves the following steps:

1. Inlet Flow

The liquid or gas to be filtered enters the filter housing through the inlet.

2. Interception

As the fluid passes through the filter bag, solid particles, suspended matter, and other impurities are trapped by the bag's microstructure, accumulating on the bag's surface or interior, forming a filter cake. The filtration precision of the bag determines the smallest size of impurities that can be retained.

3. Clean Fluid Exit

The filtered, clean fluid then passes through the bag and exits the housing via the outlet, completing the filtration process.

4. Backwashing/Filter Bag Replacement

As the filter bag accumulates more impurities over time, increasing resistance and affecting filtration efficiency, backwashing (for cleanable bags) or direct replacement can be employed for maintenance. Backwashing involves introducing clean fluid from the inside of the bag, countercurrently flushing away adhered impurities; if the bag is not cleanable or cleaning proves ineffective, the unit must be stopped for a new bag replacement.

 

III. Features & Advantages

1. High Filtration Precision

Bag filters offer a variety of filter bag precision grades to meet different applications' filtration accuracy needs.

2. Large Processing Capacity

Due to the large surface area of the filter bag, a relatively high volume of fluid can be processed per unit time. The processing capacity can be further increased by parallel or series connections to increase the filtration area.

3. Ease of Operation

Filter bag replacements are straightforward, requiring no complex tools, significantly reducing maintenance time and labor intensity.

4. Versatility

Different material and specification filter bags can be selected according to actual operating conditions, accommodating various temperatures, pressures, and chemical properties of fluids to be filtered.

5. Cost-effectiveness

Although disposable filter bags may have a higher initial cost, overall operating costs are lower, particularly in applications where filter media need frequent replacement.

 

IV. Applications

1. Industrial Production

In sectors like chemicals, metallurgy, power generation, oil & gas, coatings, papermaking, etc., bag filters are used for raw material pretreatment, product refinement, wastewater treatment, and more.

2. Environmental Engineering

In water treatment, air pollution control, flue gas desulfurization, and other areas, bag filters remove suspended solids, particulate matter, oil mist, harmful gases, and other pollutants.

3. Food & Beverage Processing

Bag filters clarify juices, beer, wine, filter edible oils, dairy products, and treat drinking water, ensuring product quality and food safety.

4. Pharmaceutical Industry

In raw material extraction, formulation production, cleanroom air purification, and other stages, bag filters perform sterilizing filtration and particle removal, complying with GMP requirements.

5. Water Treatment

In municipal water supply, industrial circulating water systems, seawater desalination, and reclaimed water projects, bag filters serve as primary filters or safety filters, protecting downstream precision equipment from damage by larger particles.

 

V. Parameters

Accuracy	0.5 - 1250μm
Filtration area	0.1 - 24 m2
Viscosity	1 - 20000 cp
Filter bag number	1 - 24
Filter bag material	PP, PE
Housing material	304, 316L
Flow rate	1 - 1000 m3/h

 

FAQ

1. Q: What is the function of a filter?

A: The main function of a filter is to remove solid particles, impurities, and harmful substances from liquids or gases, in order to achieve purification, clarification, and protection of equipment.

2. Q: How to choose a suitable filter?

A: When choosing a filter, factors such as the properties of the material being filtered (e.g., viscosity, temperature, corrosion), required filtration accuracy, processing capacity, operating pressure and medium, as well as the type, material, size, and installation method of the filter should be considered.

3. Q: What is the working principle of a filter?

A: The working principle of a filter mainly relies on physical screening, deep interception, absorption, or chemical reactions to remove impurities or harmful components from the material being filtered.

4. Q: How to maintain and care for a filter?

A: Maintenance of filters includes regular cleaning or replacement of filter elements, inspection of seals and fasteners, maintaining stable operating pressure, and avoiding overloading. Specific methods should be referenced from the filter's instruction manual and maintenance guides.

5. Q: What is the service life of a filter?

A: The service life of a filter depends on its working environment, processing volume, and filtration accuracy. Generally, when the filter's pressure drop reaches a certain value or the filtration effect decreases significantly, it needs to be replaced or cleaned.

6. Q: What should be paid attention to during filter installation?

A: During filter installation, attention should be paid to the directionality, ensuring that the fluid enters and exits from the correct ports. Also, the piping system should be cleaned before installation, and the filter should be securely fastened and sealed as required by the instructions.

7. Q: What is the replacement cycle for filters?

A: The replacement cycle for filters depends on their working conditions and filtration requirements, and is usually indicated by pressure difference indicators or timers. When the filter's pressure drop reaches the set value or the filtration effect decreases, it should be replaced in a timely manner.

 

Why Choose Us

· Professional manufacturer with many years' experience

· Good quality with competitive price

· OEM & ODM are welcome

· Various payment items are acceptable

· Good service by experienced manager

 

AIDA Philosophy

1. Management Concept:

· Satisfy the customers' demand --- Touch customers, trust with our products and services

· Make employees happy --- Pursue higher material and spiritual happiness

2. Company Mission:

· Focus on customer needs, provide best filtering solution

· To be the lifelong partner with customers

3. Corporate Vision:

· Become a global purification leadership brand

4. Values:

· Customer: Pursue the ultimate experience, enjoy excellent quality

· Team: Trust, responsibility, growth, win-win

· Work: Simple, sincere, efficient, dedicated