The Material of Drift Eliminatorss

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The two most common polymers used in cooling tower fills and drift elimina This shows just how important material of construction can be with respect to a drift eliminator.tors are polyvinyl chloride (PVC) and polypropylene (PP). Both materials offer the benefits of durability, compatibility with the water environments of most cooling towers and processes, and cost-effective manufacturing techniques to provide many different engineered profiles suitable for cooling tower uses. However, one of the impediments that both polymers present is their hydrophobic nature. The surface energy of PVC and PP are high enough to want to repel water and make it bead up on the surface. Unfortunately this action is detrimental to the performance of fills and drift eliminators, which achieve their full potential when the water fully wets the polymer surface.The resistance to wetting out is related to the surface energy of the polymer.

Drift eliminators are affected the same way as fills when it comes to their performance in relation to surface conditioning. The efficiency of a drift eliminator relies on the captured drift droplets forming a thin film of water on the drift eliminator surface so that the water drains back into the wet section of the cooling tower properly. Any beads of water on the surface are exposed to the air stream and are susceptible to being stripped off the drift eliminator and exiting the tower.

where new PVC drift eliminators were installed, stating that there was a problem with the product since there were signs of drift issues. The problems disappeared after the eliminators had sufficient time to condition via normal operation of the tower with full heat load, which is typically at least 1,000 hours of service.

What is important to note is that as drift emission restrictions become more stringent, the potential for any perturbation in the air/water interface to cause a failed drift test increases dramatically. If you look at the comparative rates of conditioning of the film fills above, you will note that the water loading on the fill plays a part in the efficiency. Consider that even after three weeks in the accelerated aging tank &#; at 3.5 gpm/ft2 (8.6m3/hr·m2) &#; the fill was only at just over 90% capability. If you were to extrapolate the capability out by month, it does not seem like it would ever reach full potential. That means that the water might never fully wet out the surface.

If the water is not able to ever form a complete film on the surface of the drift eliminator, then the full potential of the drift eliminator efficiency will never be realized. This shows just how important material of construction can be with respect to a drift eliminator.

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