Wet scrubbing involves removing solid or liquid particles from a gas stream, which is incorporated with liquid-like water to control the particulate matter.
Types of Demister Pads for Wet Scrubbers
In machine-oriented workflows, moisture eliminators and control systems are imperative. The effective functioning of a wet scrubber demands inertia and dispersion. Wet scrubbers use demister pads that manipulate the gas to control the particulates and remove them from the air.
The demister pads remove liquid contaminants from gas streams. Thus, they play an instrumental role in enhancing plant emissions, preventing equipment damage, fostering product integrity, and minimizing health risks.
Wet scrubbers are designed to incorporate mist eliminators to remove liquid droplets. Together, both can remove particulate matter and gases.
However, wet scrubbers make use of various types of mist eliminators. They include a wire mesh mist eliminator, vane mist eliminator, and fiber Bed mist eliminator. Let’s look at each kind of demister pad in short.
Vane Mist Eliminator
Vane mist eliminators remove larger droplets from gas streams. They use inertial impact to separate particulate droplets from the airflow. The eliminator rows are placed in a zigzag formation to attract droplets. They contain plates in every row that enable gas to flow through once the droplets are eliminated. These eliminators can be used for horizontal and vertical airflows.
Vane mist eliminators, also termed baffle-type mist eliminators, can be combined with wire mesh to enhance the particulate capturing efficiency. The wire mesh works as a precursor for tiny mist and forms large particulate droplets for the baffle-type mist eliminator.
Fiber Bed Mist Eliminator
If you conduct industrial processes that produce finer particulate droplets, you can use a fiber bed mist eliminator.
Fiber bed mist eliminators are cylindrical. The cylinder is formed by rolling the inner and outer screens. Additionally, plates or flanges are connected to the end for draining and mounting. Fiber bed mist eliminators best work to remove sub-micron particulates from gas streams.
These mist eliminators use Brownian diffusion to impose the droplets onto the media before reaching the outlet. Here, the velocity of the air stream and the density of the media prove instrumental in removing contaminated particulates. But you must note that these eliminators work only for horizontal gas streams.
Wire Mesh Mist Eliminator
Wire mesh mist eliminators are the most frequently used mist eliminators. They comprise various layers of metal wire or thermoplastic held by support grids. Their functioning involves forcing dirty air through the media, where the droplets coalesce and keep pushing clean air to the outlet. The eliminators remove droplets from dirty air with inertial impaction, Brownian diffusion, or interception.
Some advantages of wire mesh mist eliminator include cost-effective installation and higher separation efficiency. They work efficiently in various conditions, and you can use them for vertical and horizontal airflow arrangements.
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