Sometimes happens that:
- the dimension of the droplets is too small to be intercepted by the vanes (for example 4/5 microns)
- the flowrate speed is too high for a normal wire mesh demister and with it is not possible to entertain the droplets and they are teared over the mesh
- the required efficiency is high
- the diameter of the vessel is too small to install a properly sized wire mesh demister


In this particular case the solution is to apply a properly sized wire mesh agglomerator before the window of the vane pack. As showed in the scheme below, the droplets, passing through the agglomerator, increase their dimension arriving at the vane pack with the correct speed and diameter.

vane pack with agglomerator
perforate sheet scheme
Explanation of benefits of the use of wire mesh agglomerator and distribution perfoarted plates



When the diameter of the vessel is too small to allow a correct distribution of the flowrate there is the risk that the gas passes through only a fraction of the available area of the vane pack window.
This bad distribution of the gas flow generates two problems:
- a too fast speed of the gasglow through the vane pack
- a lower efficiency of the process because many droplets can be captured by the vanes and they are teared over the mesh.

To solve this problem is possible to apply a distribution perforated sheet that force the flowrate to be distribuited all over the available area of the vane pack window (see the scheme below)

agglomerator 2
vane pack with sheet

Left: a sample of the phase of mounting of the wire mesh agglomerator on a vane pack for horizontal vessels
Right: a vane pack with distribution plate designed for separation in small vessels