Ventilation Protection - Mist eliminator systems adaptable for all atmospheric conditions
Munters has introduced a new range of mist eliminators for the offshore and marine sectors. Deliveries have already been made to Petrobras projects and to Sakhalin.
According to Torbjörn Yllén, marketing manager for Munters' HumiCool division, offshore companies and shipowners commonly face problems brought on by moisture in the ventilation systems of their installations and vessels, such as corrosion, wet filters, and mold, which could be avoided or significantly reduced.
The company maintains that a proper understanding of fluid dynamics and condensation is required to design mist eliminators that will work effectively in a range of weather, wind, and water loading.
Munters has formulated three basic design principles for mist eliminators. These are that the smaller the droplet size range, the narrower the spacing should be between the profiles; the higher the water load, the more separation chambers are required; and for the efficient removal of salt-laden particles, filter as well as coalescer components are necessary.
These principles provided the basis for development of the new DCF and DFF ranges of mist eliminators. The former are two-stage solutions that combine inertial vanes with filters/coalescers and cover higher efficiency needs, including the removal of salt-laden droplets and solids.
The DFF products are three-stage solutions that incorporate an additional inertial vane stage behind the second-stage coalescer, so that at higher velocities, carry-over from the coalescer panel is entirely captured in the third stage. Alternatively, final filters can be installed for dry salt removal. This version is particularly suitable for supply air in marine propulsion systems, delivering air with a salt content of less than 0.01 ppm by weight. A single-stage solution is also available.
Munters' mist eliminators offer increased protection against moisture problems.
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The decision on where to place an intake and which solution to use involves factors such as on-board location, weather and sea-spray exposure, and protection needs.
For intakes exposed to sea spray, reinforcement on the intake face and the addition of extra stages may be required, as well as higher drainage capacity. An intake located in the area of sensitive machinery must be capable of removing salt-laden droplets, which may require a two or three-stage solution with coalescers."
For more information, contact Torbjörn Illén, Munters. Tel. +46 8 626 63 57, Fax +46 8 754 56 66, [email protected], www.munters.com.
