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Alexey Ovchinnikov
Alexey Ovchinnikov

Eliminators



In every cooling tower, there is evaporative water loss to the environment. When liquid water becomes entrained in the leaving air stream, however, drift eliminators are used to minimize the amount of water carried out of the cooling tower with the exhaust air. These water droplets carry the same concentration of impurities as are typically found in cooling towers. Drift eliminators are designed to prevent the droplets and mist from escaping by capturing the droplets and sending them back into the tower. Efficient drift eliminators will keep drift losses to less than .001% of the recirculating water flow rate.




Eliminators



Drift eliminators are affected the same way as fills when it comes to their performance in relation to surface conditioning. The efficiency of a drift eliminator relies on the captured drift droplets forming a thin film of water on the drift eliminator surface. This allows the water to drain back into the wet section of the cooling tower properly. Any beads of water on the surface are exposed to the air stream and are susceptible to being stripped off the drift eliminator and exiting the tower.


That's why you should choose for original BAC eliminators for replacement. Check in the table below which eliminators you need for replacement or upgrading your BAC cooling equipment.


During the 2370s, Leck was an eliminator. Many (or most) Ferengi viewed eliminators as dangerous psychopaths, who appeared to enjoy killing (thus eliminating potential customers, highly discouraged in Ferengi society) as much as or more than the profits derived thereby. (DS9: "The Magnificent Ferengi")


EXAIR industrial Static Eliminators combine our engineered airflow products with ionizers which give our products the abilty to eliminate static charges quickly and from long distances. Prevent dust from clinging to products, materials jamming or tearing, sheet feeding woes, and hazardous shocks by neutralizing static with our eliminators. Perfect for webs, sheet stock, three dimensional parts, extrusion, packaging and much more! Prevent static with EXAIR Static Eliminators.


Solberg designs and manufactures high-efficiency oil mist eliminators (OME) to capture oil mist and particulate emissions from turbomachinery and engines. Browse our powered and static vent oil mist eliminator systems, some of which include oil demister pads for pre-separation in heavy-oil load applications.


Proper location and positioning of the static eliminators and power supply is essential to satisfactory performance and life of the equipment. Because each application is unique, careful thought is required to establish the best location and installation of the static eliminators.


Metal parts in proximity to static eliminators tend to reduce their effectiveness. Whenever possible, allow two inches of free space all around the static eliminator and behind the material to be neutralized.


Universal hardware is provided with the static eliminators. Use them or other metal clamping (if preferred) to secure the static eliminators to the machine frame or other suitable stationary angle or rod.


The BR1200 and BR2200/BRE2200 static eliminators and the TSN70/TSN75A power supply are designed to be durable, dependable, and trouble free. They require a minimal amount of maintenance. Each application and each environment, in which static control equipment is installed, is different making it difficult to state accurately how often cleaning is required.


Mist eliminators, or demisters, play an essential role in removing mists and other liquids generated during industrial and manufacturing processes. During these processes, droplets of water and other molecules may become trapped in the air or gas, resulting in entrapment.


As environmental protection regulations have increased, the use of mist eliminators has risen to meet these new requirements and reduce pollutants that gases may otherwise carry. Understanding how mist elimination works will help you choose a suitable mist eliminator for wet scrubber systems.


The wet scrubbing process is designed to remove solid or liquid particles from a gas stream. This is done by merging the gas stream with a liquid like water to control the particulate matter. In environments where machines are used, it is essential to use moisture eliminators and control systems.


For a wet scrubber to work effectively, inertia and dispersion must apply. Wet scrubbers incorporate mist eliminators that help manipulate the gas to control these particulates and remove them from the air.


Wire mesh is the most common type of mist eliminator. They incur a low installation cost and provide high separation efficiency. These eliminators are usually made of several compressed layers of metal wire or thermoplastic held together by support grids. They can deliver great results in a variety of conditions, and you can set them up in vertical or horizontal airflow arrangements. Wire mesh mist eliminators work by dirty air being forced through the media, where the droplets coalesce and continue to push the now-clean air to the outlet. The droplets are removed from the dirty air by direct interception, inertial impaction and Brownian diffusion.


Vane eliminators, also known as chevron or baffle-type mist eliminators, are needed to remove larger droplets from gas streams. This type of mist eliminator uses inertial impact to separate particulate droplets from the airflow. Rows of parallel plates, or chevrons, are placed in a zigzag formation to attract droplets. There are plates in each of these rows that allow the gas to flow through once it is rid of the droplets. Vane mist eliminators can be used for vertical or horizontal airflow.


You can combine vane mist eliminators with wire mesh to provide a more efficient system for capturing particulates. The wire mesh serves as a precursor for the fine mist and forms large particulate droplets for the vane mist eliminator. When these are combined, you can expect improved performance and the benefits of each type of equipment to be optimized.


For industrial processes that generate finer particulate droplets, consider a fiber bed mist eliminator. These work very similar to wire mesh mist eliminators but are only built for horizontal gas streams.


Filter bed mist eliminators are cylindrical. An inner and outer screen is rolled to form the cylinder, and plates or flanges are attached to either end for draining and mounting. This type of mist eliminator is best used for removing sub-micron particulates from gas streams.


Mist eliminators are a perfect addition to wet scrubbers and help enhance the cleaning of contaminated air. The three types of mist eliminators can be made to meet the specifications that you require for your wet scrubber system.


Vane mist eliminators work across various applications, and the blade spacing can be adjusted for specific cases. You can arrange this type horizontally or vertically for high-capacity filtering. Out of the three mist eliminators, the vane-type creates the lowest pressure drop as gas is forced through.


The key purpose of drift eliminators in evaporative cooling systems is to reduce (not eliminate as the name suggests) the escape of water droplets entrained in the discharge air stream of a cooling tower or evaporative condenser.


Their foremost purpose is to protect people and the local environment from escaping aerosols and water droplets from a cooling tower or evaporative condenser but this is not the only benefit of drift eliminators.


A drift eliminators function relies on inertial impact of the water droplets on the walls of the drift eliminator due to the changing direction of airflow through the eliminator. When the droplets impact the side walls, they are removed from the airstream and run back into the cooling tower.


Tower design can also impact drift eliminator efficiency. Specifically, plenum height needs to allow for even air distribution across the eliminator. Support structures, distribution systems etc can create localised higher velocities that need to be considered when installing replacement drift eliminators.


Water Treatment chemicals can also cause corrosion to mechanical components of cooling towers. With droplets passing through the eliminators it is possible that fans, motors, gears, shafts and bearings all suffer the effects of the water treatment. Ensuring that drift eliminators are high efficiency and are in good condition is vital to the longevity of the whole cooling tower / evaporative condenser.


Today, the two most common polymers that drift eliminators are manufactured from are polyvinyl chloride (PVC) and polypropylene (PP), chosen for their strength and longevity in wet environments. They both however have a hydrophobic nature and repel water. This can create potential beading of water which can be drawn out of the tower.


Seasoning or ageing of PP and PVC eliminators can increase the SFE of the material and therefore increase performance. Studies on cooling tower packing made of these two materials show that PVC takes on average about half the time to become fully wetted out compared to PP. Considering that drift eliminators are never fully wetted then there is likelihood that they will never reach their specified efficiency.


With the above in mind, access is important and with eliminators on counterflow cooling towers located at the top then working at height legislation also needs to be adhered to. Permanent access platforms with handrails around all sides present the safest way of providing safe access to operatives maintaining the drift eliminators.


Drift eliminators do not necessarily need to be replaced with OEM versions and in some case they may indeed require upgrading based on how the specific tower is operating in terms of temperatures and velocities through the unit. In any case it is prudent to discuss your requirements with a cooling tower specialist so you know what options you have open to you in terms of longevity and ease of maintenance as well as performance. 041b061a72


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