Mist Eliminators
Functions
The EUROFORM mist eliminator T100 is an impingement separator designed for horizontal gas flow.
It is composed of sine shaped baffles assembled with phase separating chambers. The baffles are manufactured by an extrusion process: this enables their surfaces to be adapted to the particular separation problem. They are mounted on a frame with a sump and form a separation unit.
The baffles split the gas flow into single streams. This change of direction produces the inertia in the droplets and they strike the corrugations - thus impingement separation. As the forces of inertia act most strongly on the bigger drops, these are driven by the gas flow on to the wall of the phase separating chamber. There, gravity causes the film of moisture to fall into the sump. The construction of the phase separating chamber facilitates the flow and cuts out waste and eddying. By this means low energy is expended at high face velocities.
Types
The EROFORM mist eliminator profiles T100 can be assembled to cope with special requirements. All types of operating conditions can be met by changing the spacing of the baffles, by arranging two layers of baffles and by selecting the most suitable material. Type T120, T125 resp. T 130 Mist eliminator unit with a pitch of 20mm (T120) or 25mm (T125) or 30mm (T130) used when favorable flow conditions and low liquid load prevail. Type T120/2 resp. T125/2 Mist eliminator similar to T120 or T125 but of doubled layer construction used for high face velocities in all kinds of chemical plants.
use/special designs
The T100 profiles can be arranged to obtain the most suitable separation unit, with regard to pressure drop, separation efficiency and material in many fields of application.
So far, it has proved satisfactory in:
Moistening and air conditioning plants
Removal by suction in acid baths (e.g. chromic acid)
Ventilation plants
Behind scrubbers and washers (e.g. venturi and spray washers)
Drying plants (e.g. behind coolers)
Flue gas purifying plants
Air intake stacks (e.g. gas turbines)
Flue gas desulfurization plants
In especially difficult cases it is possible that a great number of small droplets are contained in the gas in the form of mist. Unless extra steps are taken, these could pass the mist eliminator untouched. In such cases, experience shows that a coalescer, in the form of a wire meshes. Installed in front of the mist eliminator, causes the droplets to form larger drops, which can then be separated in the eliminator.
Material Notes
The EUROFORM mist eliminator profiles T100 are made of the following materials.
Polystyrene, PVC, or Polypropylene. These operate continuously at temperatures of 75 degrees C, 55 degrees C and 85 degrees C respectively. Aluminium is also used and has no limit for temperature.
Mist eliminators are delivered as units ready for installation with a frame or complete with casing.
The EUROFORM mist eliminators are designed following special calculation methods, the limit drop size D,TGR is determined by computer. The operating principle remains effective for all densities. The eliminator can therefore, when properly designed, be used for any operating pressures and temperatures. Under normal conditions (20 degrees C and 1 bar) we recommend for the T120/2 type a face velocity of 6 to 8 m/s. Higher or lower face velocities are possible after checking the operating conditions (liquid load, overall height, distribution of velocity, etc). Under normal flow conditions EUROFORM guarantees a separation efficiency of 99.9% for drops larger in size than the limit drop D,TGR.