Wet scrubber mist eliminator is a critical component in air pollution control systems, specifically designed to remove fine mist and droplets from gas streams after they pass through a wet scrubber. Wet scrubbers are devices used to remove pollutants from industrial exhaust streams by introducing a scrubbing liquid, usually water, which captures and neutralizes harmful substances. However, this process generates a mist or droplets that can carry pollutants, which need to be removed to ensure clean emissions.

Key Components and Functionality:

1. Wet Scrubber:

• Purpose: The wet scrubber removes particulate matter and gaseous pollutants from industrial emissions by bringing them into contact with a scrubbing liquid.

• Operation: Polluted gas enters the scrubber and is sprayed with or passes through a scrubbing liquid. The pollutants dissolve or get trapped in the liquid droplets.

2. Mist Eliminator:

• Purpose: To capture and remove mist droplets formed during the scrubbing process, preventing them from exiting the system with the cleaned gas.

• Types: There are several types of mist eliminators, including mesh pads, vane-type (chevron) eliminators, and fiber bed mist eliminators.

Types of Mist Eliminators:

1. Mesh Pad Mist Eliminator:

• Construction: Made from layers of knitted or woven mesh, usually of metal or plastic.

• Function: The gas stream passes through the mesh, causing the mist droplets to coalesce and form larger droplets that drain back into the scrubber.

2. Vane-Type (Chevron) Mist Eliminator:

• Construction: Consists of a series of parallel, closely spaced vanes.

• Function: The gas stream changes direction as it flows through the vanes, causing the mist droplets to impact the vane surfaces and coalesce into larger droplets, which then drain away.

3. Fiber Bed Mist Eliminator:

• Construction: Made of densely packed fibers, forming a bed.

• Function: The gas passes through the fiber bed, and mist droplets collide with the fibers, coalesce, and drain away. These are highly efficient and often used for fine mist removal.

Advantages and Applications:

• Efficiency: Mist eliminators significantly improve the efficiency of wet scrubbers by capturing fine mist that can carry pollutants.

• Air Quality: They help ensure that the emissions meet environmental regulations and standards.

• Versatility: Applicable in various industries, including chemical processing, power generation, metal finishing, and food production.

Maintenance and Considerations:

• Maintenance: Regular inspection and cleaning are necessary to prevent clogging and maintain efficiency.

• Material Selection: The choice of material for the mist eliminator depends on the nature of the gas stream and the scrubbing liquid, ensuring resistance to corrosion and chemical reactions.

Conclusion:

Wet scrubber mist eliminators are vital for controlling emissions in industries that use wet scrubbing systems. By efficiently removing mist and droplets, they help meet environmental standards and protect air quality. Proper selection, installation, and maintenance of mist eliminators are essential for optimal performance of the wet scrubbing system.