Demisting Internals - FMC Technologies

A gas stream separated from the liquid hazes by gravity alone will always contain a certain amount of liquid. This liquid may cause damage to downstream processes, such as compression and gas dehydration. Demisting internals is required to achieve a good quality gas that meets expectations to such equipment. It is also required to avoid loss of chemical used for gas treatment. Over many years we have delivered demisting internals applicable to both low and high pressure applications. Our equipment increases the liquid-from-gas separation efficiency while allowing for compact separation processes.

CDS SpiraFlow™

The CDS Spiraflow™ is a patented technology known as an industry standard for high efficient demisting internals. Due to high G-forces and a gas recirculation concept, very high droplet efficiency at high flow rates can be achieved. The technology is commonly installed in separator vessels in combination with other separator internals, such as inlet devices and coalescing internals. In new-build applications these internals allows for substantially smaller vessels which again results in considerable weight savings and cost reductions. For retrofit applications, CDS Spiraflow™ cyclones are commonly installed in separator vessels to increase throughput capacity and demisting performance. It can be positioned vertically or horizontally within a vessel.

Vane Pack

The Vane Pack is designed for maximum performance at low-pressure drop. It is based on an aerodynamic flow concept that eliminates hooks extending into the flow stream by utilizing troughs that are flushed with the side walls of the vane plates. These troughs provide a high liquid removal capacity and position isolation of the separated liquid to the liquid section below. The vane pack consists of a series of parallel plates with side troughs for the collection of the liquid residue. The liquid-laden vapor approaching the vane plates are forced to change direction several times, with some degree of centrifugal action introduced as the change occurs. The heavier liquid droplets are thrown against the wetted walls, converting the droplets to sheet flow. Coalescence of small droplets is accomplished by the two mechanisms of agitation and surface contact; the vane surface is wet and small droplets striking it are absorbed. The agglomerated liquid then travels to the troughs that are perpendicular to the flow of the gas and drain into a liquid collector. From the liquid collector the liquid is drained into the bottom of the scrubber via a down comer tube.

Mesh Pad Demister

This device contains a knitted wire mesh, supported by an open grid. The gas flows unimpeded through the wire mesh and the inertia of the droplets causes them to impact the wire surface. The droplets then coalesce on the wire surface. When the droplets reach a certain size they fall down due to gravity.