Vane type mist eliminator

The vane type mist eliminator consists of a series of baffles or plates, and the gas flows between them, as shown in Figure 3.3. The droplet that is impinged on the surface has a free fall downward. The space between the baffles varies from as low as 5 mm to 75 mm, and the depth in the direction of the flow varies from between 150 to 300 mm. 

In case of a horizontal separator, significantly higher gas flow can be achieved in comparison to vertical gas flow, simply because, in the horizontal mode the liquid can easily drain downwards due to gravity. This is the reason the vane type mist eliminator is very popular in horizontal separators. 

The efficiency of the vane type mist eliminator is defined as [3]... 

The pressure drop for a vane type mist eliminator can be calculated as the summation of the number of rows of baffles present [2] ... 

Flo. 9—These popular mist eliminator designs are wire mesh pods, vane eliminators and arch plates. Wire mesh is least expensive, but velocity sensitive Vane eliminators impose laminar flow and directional changes on gas stream. Arch plates, consisting of cylinders of corrugated piste, function much like vane-type eliminators. 

Two special requirements for the effective use of structured packing are efTiciem mist eliminators and uniform iiquid distribution. Kean et al. (1991) recommend a vane type eliminator with a 3- to 4-in. mesh pad face to minimize carry-over. A simple wire-mesh mist eliminator is not considered adequate at the high gas velocities employed with structured packing. They also recommend that a high-efficiency drip-type distributor be used with typical matrix dimensions of 4 in. by 4 in. and the peripheral drip points iocated no more than 2 in. from the wall. The distributor must be installed as close as possible to the packing to ensure good distribution and minimize carry-over. 

Mist eliminator is used to remove the liquid droplets in vapor flow. There are three types of mist eliminator -wire mesh, vane, and fiber bed. Each has its own plication. 

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