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The Knitted Mesh Pad Mist Eliminator is fabricated in pad form from symmetrical interlocking loops of knitted metal wire or plastic monofilaments. The pad with a high free volume and large impingement area, can be installed in any existing or new process vessel to provide separation efficiencies up to 99% for particles down to five microns at pressure drops in the vicinity of 25 mm WG. The HESLY MIST ELIMINATOR is a static, in-line device and in a majority of the cases it can be installed in the evaporator, scrubber, pressure vessel etc., without a special housing. There is practically no maintenance required except for cleaning when used in fouling services.
When vapour carrying entrained liquid droplets or mist passes through the Mist Eliminator, the vapour passes freely through the layered mesh structure of the Mist Separator but the liquid droplets, having greater inertia, contact the large wire surface exposed and are briefly held there. As more droplets collect, they coalesce and grow in size and become large enough to drain back into the system. The overhead product is pure vapour containing practically no liquid.
The separating action of a separator largely depends upon the contact surface area necessary for impingement which must be evenly distributed. Generally speaking, a higher free volume leads to a lower pressure drop. In critical cases, it may be necessary to decide whether pressure drop or efficiency should be sacrificed. However, the Mesh Pad Mist Eliminator allows the greatest possible efficiency at the lowest possible pressure drop.
Normally HESLY MIST ELIMINATOR will remove droplets down to 5 microns with an efficiency upto 99%. This efficiency will vary depending upon the particle size distribution and other operating conditions. Furnished in a wide variety of mesh styles, the HESLY Mist Eliminators offers collection efficiency and pressure drop combinations that can be suited exactly to specific process requirements. Special design are now available with higher efficiencies for specific applications.
The wiremesh Demister Pad of the MIST ELIMINATOR is sandwitched between a top hold down grid and a bottom support grid. Special grids with a high percentage of open area have been developed for this purpose. The wiremesh pad is resilient and is slightly oversize to provide a snug fit in the vessel. The purchaser should provide a 50 to 75 mm wide annular support ring drilled with 3 to 6 mm diameter holes and welded to the vessel wall. The wiremesh pad and grid assembly is then fastened securely to the grid using 2 mm diameter tie wires (or when specifically required with suitable fasteners). Intermediate support beams are also recommended for all spans larger than 1800-2000 mm.