The 4G-FD Demisting Cyclone is an axial (straight through), high performance separation device combining highly efficient droplet separation characteristics with important practical issues such as simplicity to install and non-clogging (minimum maintenance) properties. The cyclones can be utilised in any configuration in horizontal and vertical separators.

Particles enter the cyclone in the gas flow through the optimised swirl element, where the gas motion gradually transforms into a rotational motion. Under the influence of centrifugal forces, the particles are transported to the aerodynamically shaped body of the cyclone where they are separated.

The patented design solves known issues such as liquid-creep and introduces new features such as pre-separation in the swirl-element section, optimal fluid dynamic spin-up features due to the elimination of re-cycle flow in the centre of the cyclone and secondary separation features implemented in the drainage chamber, a feature eliminating known problems with liquid entrainment back into the cyclone from the drainage chamber.

In addition to separating small droplets and thus offering a highly efficient demisting solution, the 4G-FD Demisting Cyclones are designed to extend the operational flexibility of separators by eliminating foam to the downstream equipment (costly anti-foam chemicals can be reduced by 50-100%).

These important characteristics solve liquid carry over problems generated by secondary foam generation, a problem often seen in separation equipment, thus protecting downstream equipment e.g. compressors.

Advantages of the 4G-FD Demisting Cyclones:

• High efficiency at high operating pressures & with complex fluids.
• High throughput.
• High liquid loading.
• Low pressure drop vs. droplet separation efficiency.
• High turndown.
• Elimination of foam, thus reducing OPEX by dramatically reducing usage of anti-foam chemicals.
• Robust construction.
• Wide operational range.
• Commonly reduces the vessel size on a new build project.
• Ideal for upgrades / revamps.
• No moving parts thus no maintenance.

Typical Performance:

• <0.1 USG/MMSCF in gas outlet.
• 100% separation efficiency for droplets > 4.5 microns (atmospheric conditions).
• > 4 : 1 turndown, extendable to 100% turndown in combination with pre-conditioners.
• At increased pressure, 70 bara (gas density 65 kg/m3 and condensate density 610 kg/m3) 100% separation efficiency for droplets > 6 microns.

Applications:

• Scrubbers.
• Separators.
• Slug catchers.
• Distillation, Absorbtion and GDU columns.
• Any operation where droplets need to be removed from a gas stream.
• Floating production systems.