Mist Eliminators

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Mist eliminators are used to remove liquid from different gas streams, and are regularly found in cooling towers, ventilation systems and air scrubbers. They operate using a variety of methods, from changing the direction of the gas flow and centrifugal force to various filters. Originally, mist eliminators simply consisted of a collection of packed plates, but advanced materials and techniques have allowed them to become smaller and more efficient.

The primary types of mist eliminators used are knitted wire, vane and fiber bed, although other designs are available for specialized applications or requirements. Knitted wire mist eliminators are among the most common and consist of a net of crimped wire. These crimped wire nets can be used in multiple layers or can be stacked in a larger pad for better mist reduction. As the moist air passes through the mesh, the mist droplets attach to the wire while the dried air escapes.

Vane mist eliminators perform the same function using a series of stacked, corrugated plates. These plates are spaced a short distance apart and shaped in various curves and contours to force the passing mist to come in contact with them. Although relatively inexpensive, vane mist eliminators are not suitable for use with extremely small droplets of mist. For the most minute droplets, fiber bed mist eliminators are preferred. These devices use a weave of thin glass or synthetic fibers to remove mist droplets from the passing gas stream (including droplets less than one micron in size). However, due to the relatively tight weave of the fiber filter, the maximum flow capacity of fiber bed eliminators is lower than that of knitted wire and vane units. Generally, wire mesh pads and vane eliminators are manufactured in circular or rectangular shapes, while fiber bed eliminators are typically designed in tubes known as candles.