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.
Some benefits of Fiber Bed Filters are that they have high collection efficiency of sub-micron particulates. There are no moving parts. They offer low maintenance and operating cost. Typically, they guarantee low pressure drop and deliver proven results. One of notable benefits is that the filters can be a new design or replace an existing design and filter cages can be re-packed, allowing for an economical solution.
By choosing a company that specializes in Mist Elimination and Fiber Bed Filters, you can essentially remove any type of mist from the gas stream. By trapping and removing contaminant mist particles, even those that are submicron in size, you will be able to meet stringent air pollution standards, increase manufacturing process, produce a cleaner working environment, and avoid costly shutdowns. Companies that test their filters in house for bed performance and pressure drop will provide piece of mind.