Components of a Fiber Bed Filter

Fiber Bed Filters are typically used in the removal of sub-micron particles and liquids in the gas stream through inertial and Brownian diffusion collection mechanisms. Fiber Bed Filters offer a high collection efficiency, up to 99.9% removal can documented. Fiber Bed Filters capture and collect oil mist from the airstream which optimize performance and protect the downstream equipment from failure. They can be used in organic applications, such as, asphalt roofing products, compressed air and gasses, food processing, metal matching oil mist, plasticizer, and rotating equipment lube oil reservoirs. Fiber Bed Filters can also be used in chemical processing applications, such as, sulfuric acid, chlorine and chlor-alkali, pulp and paper, semiconductor, acid storage tanks and platinum recovery. Overall, filters offer high removal efficiency, easy installation, simplified maintenance, and long filter life.

Fiber Bed filters are typically cylindrical and can range is size, reaching heights reaching 20 feet. The filter is composed of various structural materials known as cages or screens. These cages are made of various durable materials such as, stainless steel, carbon steel, corrosion resistant alloys and polymer materials. Sometimes Fiber Bed Filters are constructed with FRP inner and outer cages and plated, this design is often used for controlling fumes from toxic chemicals from waste incineration applications. The “bed” portion of the filter is typically composed of fine fibers of media consisting of various grades and densities packed between two cylindrical screens with flanges at the end. Pressure drop and collection efficiency are influenced by the fiber material, the diameter of the fibers and the density in which it is packed. Fiber bed filters can be either hanging filters or standing filters and typically can by handled by two technicians.

The contaminated airflow either enters from the center of the filter to the outside (forward flow) or from the outside to the inside (reverse flow). Only particles are collected by the filters, any vapors that enter the filter will pass through and be exhausted with the air. That is why the efficiency is given for particle collection. In addition, the Brownian diffusion collection is achieved through the design of a specific bed depth. This “deep bed” filtration makes it more important to limit the amount of insoluble solids that enter the filter. Insoluble solids will collect permanently in the filter, while liquid particulate, such as condensed asphalt light end will coalesce and drain from the filter.

Source: https://www.kimre.com/components-of-a-fiber-bed-filter/

Fiber Bed Filtration – Not all Filters are designed the Same

Optimal filtration is imperative during times of heavy manufacturing and taxing demands on manufacturing plants. It has never been more important to maintain a line of quality filtration to reduce opacity and emissions. Fiber Bed Filters mist collectors are used to trap, collect, and remove liquids and soluble particulate suspended in a gas stream. Fiber bed filters, also known as Candle Filters, Coalescing Filters, or Fiber Mist Collection Systems effectively remove up to 99.9% percent of sub-micron particulates. They are also used to collect insoluble solids. Fiber Bed filters are known to work well in applications such as asphalt, metalworking or oil mist, food processing, chemical processing, acid mist control, and many other industries.

Fiber Bed Filters are designed to provide the final user with many years of optimal performance and minimal operation or maintenance requirements. Typically, these filters are handcrafted and constructed in cylindrical form, filters can range in size from 1 ft to massive in size approaching 20 ft.

The body of the Candle Filter is made of inner and outer cages composed of Carbon Steel, Alloy materials, FRP, and Polypropylene. Depending on your performance indicators, a specific composition of layers will be selected. The filter unit rest on or are suspended from a tube sheet inside a closed tank. The design will aim to optimize efficiency and pressure drop.

Integral prefilters can be provided to improve performance and life of the Candle Filters in the system. Various replacement options are available to facilitate replacement of the prefilter.

Quality Fiber Bed Filters should provide you with low initial pressure drop that results in energy savings. Filters should yield long filter life which means low replacement cost and low maintenance cost. Each filter should be tested in-house to ensure field performance.

Choosing a manufacturer

You should choose a supplier that can manufacturer Fiber Bed Filters to replace your current filters which will provide improved performance and/or filter life. The sales and technical staff should have extensive experience with existing installations allowing them to provide the exact solution you need.

Mechanisms of filtration

When particles larger than 3 microns are prevented from flowing around the fibers they will then strike and collide with the fiber, known as Inertial Impaction.

Generally, particles between 1.0 and 3.0 microns move with less momentum and follow the air stream until they come in proximity and are collected by the fibers and thereby removing them from the air stream, knows as interception.

As extremely fine particles also known as sub-micron particles that contain little mass collide with gas molecules, they will move in a side-to-side motion or random motion also known as Brownian movement This greatly increases the probability of collision with a fiber on the filter.

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