The vane types are very usual and useful internals for liquid separation from gas. These types according to design and shape can remove the droplets more than 8 microns.
The mist droplets, which are separated by the resulting centrifugal forces, collect on the vane blades. This coalesced liquid film is then drained through slits or pockets to a liquid sump from where it drains to the liquid compartment of the vessel.
Materials of Construction
- Stainless steel
- Carbon steel
- Nickel-based alloys
- Titanium
- Fluoroplastics
- Polypropylene
- Polysulfone
- ther special materials
- available on request
Capacity
Vanes can operate at higher gas velocities than knitted mesh mist eliminators. The Souders-Brown equation, a function of gas velocity, gas density and liquid density, is used to determine the appropriate flowing velocity for a given system. . The Souders-Brown Equation is:
Where VG = Design Gas Velocity
K = Capacity Factor
pL = Liquid Density
pG = Gas Density
The capacity factor is determined through experience and for each application. It is influenced by the type and style of mist eliminator, the relative geometry of mist eliminator to vapor flow, as well as process considerations such as operating pressure, fluid viscosities and liquid surface tension. Typical values are 0.5 ft/sec for vertical flow and 0.65 ft/sec for horizontal flow, assuming an air/water system at ambient conditions.
