What is coalescing filter and how does it work?

Compared with particulate filtration, coalescing filtration usually adopts more fine glass fiber filter elements to remove droplets and aerosols. If you want to know more about coalescing filtration, then read the article below.

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What are the coalescer filter and separator filter?

 To separate liquid droplets and aerosols from both liquid and gas media, a coalescer and separator filter are utilized. Specialized materials such as micro-fiberglass, synthetic fibers, and thermoplastic resins are used in the production of coalescer filter components.

Each coalescer filter material has a range of filtering grades for various coalescer functions and media and is specifically designed to meet the requirements of the application.

Coalescer cartridges are employed as the first stage in filter/separator vessels for hydrocarbon fluids. They perform two functions: (1) coalesce (combine) highly dispersed, emulsified water particles into larger water drops and (2) filter-out particulate contaminants. The left photo below shows a highly magnified view of the coalescing process. Tiny droplets of water contact and adhere to strands of fiberglass. Flow pushes the droplets along the strand until they reach an intersection of strands where they combine with other droplets (coalesce) into large drops. These large drops are then carried to the outside surface of the cartridge. Having a higher specific gravity than the hydrocarbon fluid, they release and gravity pulls the droplet to the bottom of the vessel. The larger the drops, the faster and more efficiently they fall out. (See top right photo.) In general, particle removal efficiency increases with coalescing efficiency.

This is accomplished by employing a tighter, finer filtration media. Flow direction is from inside to outside of the cartridge. This minimizes surface velocity and helps prevent the water drops from breaking up and being carried downstream.

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