The application of demister systems has become of age, and various techniques are now available for use in cleaning vaporized liquids. A typical process involves the use of a demister pad, and a vane pack, a combination best known to yield perfect results. When fitted in vapor-liquid separator systems, demisters allow for the removal of liquid (water) droplets contained in vaporized steam. As a result, a uniform operational humidity, temperature and steam purity is attained. The article detailed under outlines how the demister pad works.
At the inlet phase, vaporized steam is injected into the demister, where it comes into contact with a specially positioned demister pad. The uniquely crafted wire mesh pad (mist pad) allow for the trapping of liquid droplets in the vaporized steam. At this stage, the mist eliminator “catches” the droplets by allowing the mesh surface to effectively collide with the liquid droplets.
At the pad
Continuous pumping of the steam through the mesh filaments allow for further collision, leading to substantially high levels of surface contact between the pad and the steam. As the mist diffuses through the filament, the trapped droplets flow along the filaments towards the adjoining mesh intersections. As the drops flow downwards, they become bigger making them heavier to be strongly held in the filament. Consequently, the gravitational pull on the droplets leads them to detach from the filaments, as further steam passes through the pad. As the demister surface bordering the pad becomes more saturated with the condensed droplets, the pad released the excess droplets through the outlet valve.
When saturated, mist pads require replacement in order to restore the demisters in their perfect working condition. This combines tactful removal of the saturated pad and replacement of the used pad with a new one. Expert advice is required at this stage to avoid damaging the pad or the demister. For further details, contact Aeroex today.