Wet Scrubber Unit
DEC.WSU™
The Wet Scrubber Unit (WSU) is an air pollution control device that uses a liquid to remove pollutants from a gas stream. These scrubbers are highly effective for removing both particulate matter (like dust and aerosols) and gaseous pollutants (like acidic gases) by bringing the contaminated gas into contact with the scrubbing liquid. The process works by capturing pollutants through a combination of impaction, absorption, and chemical reactions.
Wet Scrubber Unit (DEC.WSU™) • principles of operation
The basic principle behind a wet scrubber is creating an interface between the polluted gas and the scrubbing liquid. For particulate removal, particles in the gas stream collide with and are captured by the liquid droplets. This is particularly effective for particles smaller than 10 micrometers (PM10). For gaseous pollutants, the gas dissolves into the scrubbing liquid (absorption). Often, chemicals are added to the scrubbing liquid to react with and neutralize specific pollutants.
Wet Scrubber Unit (DEC.WSU™) • applications
DEC.WSU™ systems are used across a wide range of industries for environmental compliance and process control.
Wet Scrubber Unit (DEC.WSU™) • available configurations
Wet scrubbers come in various configurations, each designed to optimize performance for specific applications. The choice of scrubber depends on factors such as the type and concentration of pollutants, the desired removal efficiency, and the gas stream's characteristics.
A packed bed scrubber is a highly efficient device for removing gaseous pollutants. The scrubber vessel is filled with packing material (e.g., rings, saddles, or structured packing) that provides a large surface area for gas-liquid contact. The polluted gas flows upward through the packing while the scrubbing liquid trickles downward.
This counter-current flow maximizes the absorption of gaseous pollutants. The packing material prevents the gas and liquid from channeling, ensuring uniform contact.
A venturi scrubber is a high-efficiency device that excels at removing fine particulate matter. It consists of a converging section, a throat, and a diverging section.
The polluted gas accelerates to high velocities in the narrow throat, where it collides with a stream of scrubbing liquid. The high velocity and turbulence cause the liquid to atomize into tiny droplets, which effectively capture small particles through impaction. The mixture of gas and liquid then enters the diverging section, where velocity decreases and a separator removes the liquid from the gas stream.
A spray chamber or spray tower is a simple, low-energy scrubber primarily used for removing gaseous pollutants and coarse dust. It consists of an empty vessel where the polluted gas flows upward while scrubbing liquid is sprayed downward from nozzles.
This counter-current flow maximizes the contact time between the gas and liquid droplets, promoting absorption. The efficiency is largely dependent on the size and number of droplets, with smaller droplets offering a larger surface area for mass transfer.
A cyclonic spray scrubber combines the principles of a spray tower and a cyclone separator. The polluted gas enters tangentially at the bottom, creating a swirling, cyclonic flow. Scrubbing liquid is sprayed into this vortex. The centrifugal force from the swirling motion throws the liquid droplets and captured particles against the scrubber's walls, where they drain to the bottom.
This design is effective for removing both particulate matter and gaseous pollutants, offering a balance between efficiency and pressure drop.
An ejector venturi scrubber uses the kinetic energy of a high-velocity liquid stream to entrain and scrub the polluted gas. The scrubbing liquid is pumped through a nozzle, creating a high-velocity spray that creates a low-pressure zone. This vacuum draws the polluted gas into the scrubber, where it mixes with the liquid droplets.
This design is unique because it doesn't require a separate fan or blower to move the gas, as the motive liquid provides the necessary energy. It's often used for handling corrosive, explosive, or high-temperature gas streams.
contact DEC
If you are looking for a reliable and efficient Wet Scrubber Unit, feel free to contact DEC: we can help you assess your needs and recommend the best WSU for your operation.
