OIL MIST ELIMINATORS & DROPLET SEPARATION FILTERS

CANDLE FILTERS / FIBER BED FILTER - Blue Smoke Oil Mist Eliminators 

 The role of droplet separators, demisters or mist eliminators is to remove a liquid from an air or gas flow using mechanical collection by surface or filaments. The liquid may be a pollutant or, like water, be per se benign, but in either case it is contaminating the air or gas.

The separation of the liquid from the air or gas within a process may:

-Prevent contamination of the process

-Prevent damage to, or corrosion of, downstream equipment 

-Recover a useful product

-Prevent undesirable atmospheric emissions

The range of filter types

Liquid is entrained in an air or gas flow following either of 2 basic situations.

-The air or gas meeting mechanically generated spray or generating the spray as it passes through a liquid. Such mechanically formed sprays are termed ' droplets ' and are usually always over 5 to 10 microns in size. The coarser droplet filtration is done by impingement in a vane separator, and/ or by knitted wire demisters, also known as mesh pads.

-The air or gas reacts chemically or physically resulting in a fume or condensation mist formation. These particles are mist or aerosols mainly below 3 microns, frequently sub-micron in size. Fine droplet and mist filtration can be achieved using co-knitted wire / fibre coalescers or, for effective sub-micron collection, using Candle Filter type Mist Eliminators.

Fiber Bed Candle Filter     

Oil mist eliminator for turbine and engine lubricating systems  

Candle Filters or Fibre Bed Filters

Mist Eliminators - often referred to as Candle Filters or Fibre Bed Filters - originally developed in the research laboratories of I.C.I. are intended for the complete removal of very fine mist particles less than 2 microns diameter.

The mechanism of Fibre Bed filters is well known and is basically a combination of  impingement for particles greater than 1-2 microns in diameter and diffusion for the finer particles where Brownian motion becomes increasingly predominant.

As the gas passes through the filter bed the small mist particles are bombarded by the gas molecules surrounding them, causing them to move in various directions, towards and away from the surface of the fibres of the filter.