What is a Coalescer Filter
Author:huahang Time:2016-03-11 16:13:44
When using fuels or other fluids, it is essential that they are free from particulate contamination and free water. If the fluid does not meet the required
cleanliness standards, fouling and corrosion of the equipment downstream may occur, leading to expensive maintenance costs and reduced
component life. In today’s environment, it is also necessary to recover and recycle the ‘waste’ fluids from the process.
Coalescing is one of the separation technique used worldwide by the process industry for liquid-liquid and liquid gas separation. This technique
involves coalescing of small particles or droplets into larger ones by means of barrier or electrical energy. It is one of the most cost effective methods
used today as compared to salt driers, settlers or thermal / vacuum separators. Nowadays, coalescers are often considered preferable to conventional
gravity separators. It requires less capital, low operating cost, minimal maintenance and requires less floor space.
Coalescence is the process by which two or more small droplets come together to form larger droplets. It works by attracting miniscule droplets of
water or other liquid, possibly even as small as a single molecule. The droplets come together by the force of molecular attraction and surface tension.
When they reach a sufficient size, they can be removed from the system by suitable means.When two liquids are immiscible, or nonsoluble in one
another,they can form either an emulsion or a colloidal suspension. In either of these mixtures, the dispersed liquid forms droplets in the continuous
phase. Traditionally, gravity separators were used to handle emulsions before the use of coalescer became common. In this equipment, differences
in densities of the two liquids cause droplets to rise or fall by their buoyancy. The greater the difference in densities, the easier the separation becomes.
Rising or falling droplets are slowed by frictional forces from viscous effects of the opposing liquid. This mechanism of separating liquids by gravity is
called Stokes Settling. The various steps of coalescing are:
1 Collection of droplets
2 Small droplets coming together to form larger ones
3 Rise or fall of the enlarged droplets
A coalescer is a device for separating immiscible liquids (L/L) or liquids from a gas stream (L/G).
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