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/
