The EVERON range of mist eliminators are the Chevron type of mist eliminators which consist of a set of specially designed vanes with a well defined geometry. Gas with entrained liquid droplets flows between the vanes of the EVERON Separator. The gas can easily take the turns while the liquid droplets cannot follow the gas streamlines and impinge upon the walls of the vanes and coalesce to a size where they drop down and are collected and removed.
CAPACITY
The EVERON separators working on the inertial separation mechanism can be used efficiently over a wide gas velocity range without a significant loss of droplet removal efficiency. Thus, for situations where wide flow rate ranges are possible, the EVERON is a preferred choice compared to cyclonic type mist eliminators.
The operating velocity is obtained by a force balance between the gravitational, drag and surface tension forces acting on the entrained droplets. A wide operating velocity range is possible & the capacity of the EVERON is only limited by the phenomenon of reentrainment of the coalesced droplets and hence the design velocity has to be kept well below this critical velocity which leads to reentrainment.
EFFICIENCY
EVERONS are largely used for the separation of coarse mist (or spray) from gases and vapours. A limit drop size (Dp) is used to characterize them and it is defined as the smallest particle which can be removed to an extent of 99%. The normal (Dp)are in the region of 25 microns and higher. However, special designs are available for applications requiring removal of particles smaller than this size.
PRESSURE DROP
Due to the large percentage of the cross section available for gas flow, the pressure drop in a vast majority of applications is less than 25-50 mm WG. As mentioned above, for high efficiency applications, a larger pressure drop is to be expect.
APPLICATIONS
Due to its constructional features, the EVERON has a lower tendency to fouling. Recommended areas of operation would therefore include:
• Applications where droplets will be sticky or viscous and will plug conventional Knitted/Fibre Bed Mist Eliminators.
• For systems containing certain solids it would be possible to carry out intermittent cleaning with spray nozzles.
• Situations where wide flow rate ranges are possible which renders the cyclonic type systems unsuitable.
SPECIAL DESIGN FOR HIGH PRESSURE/HIGH EFFICIENCY APPLICATIONS.
EVERGREEN has designed a range of EVERON mist eliminators for critical applications in the oil and gas sector, for high-pressure boiler applications. These are primarily of the EVERON HFV configuration with collection efficiency of essentially 100% for particles 8 microns and larger and pressure drops below 0.1 kg/cm 2 . These are compact designs which are useful in high-pressure installations and offshore platform due to their reduced size. EVERON mist eliminators have now been operating for such critical duties at operating pressures as high as 100 bar. In addition, EVERGREEN also offers designs for horizontal gas flow wherein the EVERMESH media is used as an agglomerator / coalescer for fine aerosols which are subsequently fed into a vane (typically EVERON HFV configuration) for removal as a larger drop.
Alternatively, for vertical gas flows an EVERON VFH mist eliminator is placed as the first stage coarse separator for situations where a high inlet liquid load or a fouling situation is envisaged. An EVERMESH unit is then used to effectively clean/polish these gases downstream of the vane mist eliminator.
MATERIAL OF CONSTRUCTION
Standard Material of construction for the EVERON VFH series are polypropylene & stainless steel while for EVERON HFV series it is PVC & stainless steel. Other materials can be manufactured upon request.