Bag filter cage

Types of bag filter cages

A bag filter cage is a support structure used in bag filter machines. The cage delivers support to the filter bags and ensures the filtration system works well. Used to support the filter bags of the same type, this wire frame helps the filter bags stay in shape while collecting dust. There are different types of bag filter cages described below:

• Fan-shaped filter cage

  The bag filter frames in a fan shape have cages resembling a fan. These filter cages hold the filter bags in a specific way to provide room for dust particles to enter the filter. The fan-shaped filter cage design delivers lesser resistance, leading to better airflow. Many filtration systems use the fan-shaped cage in the cement industry.

• Hooped filter cage

  The hooped filter cage has horizontal hoops on the filter cage post. These hoops provide the filter bags with support at different levels. The design allows the filter bags to expand when the dust particles come in during the filtration process. The hooped filter cages are used in power plants and industries that handle metal and mineral ore. The support these cages offer prevents the filter bags from collapsing during work operations.

• Rectangular filter cage

  The rectangular bag filter cage looks like a rectangle. It has vertical posts with welded horizontal rods integrated into them. The design of the rectangular cage makes it easy to support a larger number of filter bags. It also helps to create a bigger space for dust particles to come in during the filtration process. Many industries, like the chemical and petroleum industries, use the rectangular filter cage. This is mostly done when there's a need for accommodation and high volumes of filtration.

• Spider filter cage

  The spider cage filter has tubular pipes resembling a spider or a web. This specific design provides adequate support for the filter bags. It also gives room for the air to flow freely through the filter bags. The spider bag filter cage is commonly used in power plants, steelmaking, and food processing industries.

Specification and maintenance of bag filter cages

Specification

• Dimension

  Due to the variety of filter bags, the sizes of the filter cages are also different.

• Material

  Generally, the materials with high strength and excellent corrosion resistance, such as carbon steel, stainless steel, and alloy steel, are chosen.

• Structure

  Typically, the filter cage possesses a supporting rod, top cap, and lower base. The supporting rod offers support to the filter bag, which prevents the filter bag from collapsing. The top cap connects and fixes the filter cage to the equipment or pipeline. The lower base determines the filter cage's height and location.

• Mesh

  Due to the widespread use of mesh filter cages, they usually have different mesh sizes and numbers. The common mesh specifications include 1x1 inches, 1x2 inches, etc.

Maintenance

Clean. After prolonged use, dust and dirt will accumulate on the surface of the filter cage. Therefore, it is necessary to clean the filter cage regularly to ensure that it remains clean and free from impurities. When cleaning, some mild surfactants and soft brushes can be used to avoid damage to the surface of the filter cage.

Check for damage. Regularly check the filter cage for signs of damage, such as bends, breakages, or deformations, in order to maintain its filtering efficiency. If any damage is found, promptly repair or replace it in order to ensure its normal use.

Prevent corrosion. The service life of a filter cage is often shortened by corrosion. Therefore, it is necessary to take anti-corrosion measures, such as applying anti-corrosion coatings or using filter cages with anti-corrosion treatments, to prolong the service life of the filter cage.

Keep ventilated. It is essential to ensure good ventilation and ventilation to avoid the breeding of mold and bacteria, which, in turn, affects the service life of the filter cage. In addition, ventilation can keep the filter cage dry, thus preventing rust.

Storage. When not using the filter cage, it should be stored in a dry, ventilated place away from direct sunlight and precipitation. At the same time, it should be kept away from harmful substances, such as chemicals, to avoid damage to the filter cage.

Scenarios of bag filter cages

Bag filter cages are used in different industries for various filtering or dust collection applications. A few of those industry-specific uses are as follows:

• Dust collection and filtration

  One of the primary uses of bag filter cages is to provide support to bag filters in dust collectors. These cages help obtain better filtration by giving the fabric filter bags the necessary support. This also prevents any bag swelling or collapsing when the dust-laden air passes through them.

• Food and beverage industry

  In the food and beverage industry, filter cages can be found in the production lines of those goods. They are mostly used to support bag filters that separate solid particles from liquids such as beer, juice, and wine. This ensures product quality and prevents any contamination.

• Chemical processing

  Bag filter cages are commonly used in chemical processing plants to support filter bags employed in the production of chemicals. They are also used during the chemical process to remove unwanted solids from chemical streams, protect pumps, and ensure product purity.

• Car wash

  In a car wash facility, bag filter cages are used to support the bag filters that remove dirt, soot, and other contaminants from the water used to clean the vehicles. This not only helps protect the environment but also ensures that the water is clean and safe for the car company's proper functioning and paint.

• Pharmaceutical industry

  In the pharmaceutical industry, bag filter cages are used to ensure product quality. They support bag filters used in drug production to eliminate any potential contaminants, such as particulate matter, that may affect the purity of pharmaceutical products.

• Paint sprayers

  In a paint sprayer machine, bag filter cages support the filter bags that prevent any clogging of the paint sprayer filter. They extend the life of the paint sprayer and protect it from damage by removing dust and particulate matter from the paint.

• Wastewater treatment

  In wastewater treatment plants, bag filter cages are used to support bag filters that remove suspended solids from wastewater. This helps improve the quality of the water and ensures proper functioning of the treatment system.

How to choose bag filter cages

When choosing a bag filter cage, people need to consider a few things. First, they need to know the type of filter bag they are going to use with the filter cage. It's crucial that the bag filter cage is compatible with the filter bag to make sure it works well and lasts a long time. This means looking at things like the shape, size, and material of both the cage and the bag.

Next, people should think about the machine or system where they will use the bag filter cage. They need to check the dimensions and configuration of their equipment to confirm that the filter cage will fit correctly and work effectively in filtering out unwanted particles or impurities from the air or liquid being processed.

Additionally, users need to decide on the material for their bag filter cages based on its intended use and filtering needs. Different materials provide various levels of strength, resistance to temperatures or chemicals, and endurance against physical wear-and-tear. For example, stainless steel is strong against rust but can withstand certain temperatures. In contrast, carbon steel has high durability and thermal resistance but lacks corrosion resistance properties.

Moreover, buyers have to pay attention to how well-structured the filter support is, like its horizontal and vertical spacing, as this affects the distribution of bag tension and dust load during operation. A uniform bag tension helps share the weight evenly while filtering dirt from air passageways. Evenly distributed dust loads prevent overloading of specific spots which could cause premature bag clogging because filter clogging leads to reduced machine efficiency rates.

Finally, consider the manufacturing quality standards applied during production of selected filter cages so that they can offer reliable support for filters inside various types of industrial plants who heavily rely on functionally sound equipment all-day-every-day.

Bag filter cage FAQ

Q1: How strong is a filter bag caged in a dust collector?

A1: The filter bags in the dust collection system are supported and held upright by the bag filter cage. The size, shape, and material of the filter bag cage will affect its strength. Steel filter cages are typically strong enough to support the filter bags for many years.

Q2: How durable is the bag filter?

A2: The typical durability or lifespan of a bag filter used in a dust collector is two to five years. Many factors influence the wear and tear of bag filters. These include the material used for the bag filter, the density of the fabric, the amount and type of dust, and the temperature.

Q3: What is the operating temperature of an air filter bag?

A3: Most air filter bags operate well at temperatures below 60 degrees Celsius. However, high-temperature filter bags are available for use in dust collectors where the temperature can be between 150 to 200 degrees Celsius.

Q4: What dust collector filter has the finest filtration?

A4: The HEPA (High-Efficiency Particulate Air) filter is the bag filter that dust collectors use when looking to achieve the finest filtration. This type of air filter captures and removes up to 99.97% of tiny particles from the air, including those as small as 0.3 microns.