Märkäkuivain

Märkäkuivain, also known as a wet scrubber, is an air pollution control device used to remove particulate matter and gases from industrial exhaust streams. It operates by using a liquid, typically water, to trap or absorb the pollutants. The dirty gas enters the scrubber and comes into contact with the scrubbing liquid. This contact can occur in various ways, such as through spraying the liquid into the gas stream, allowing the gas to bubble through a pool of liquid, or passing the gas through a wetted packing material.

The primary mechanisms of pollutant removal in a märkäkuivain are impaction, interception, adsorption, and absorption. Particulate matter can be captured by colliding with the liquid droplets or by being intercepted by them. Gaseous pollutants can be dissolved into the liquid (absorption) or react with chemicals added to the liquid (adsorption). The choice of scrubbing liquid and the design of the scrubber depend on the specific pollutants being targeted and their concentrations.

After the scrubbing process, the cleaned gas is released into the atmosphere, while the contaminated liquid is either treated and disposed of, or the pollutants are recovered. Märkäkuivaimet are widely used in industries such as power generation, chemical manufacturing, and cement production due to their effectiveness in removing a broad range of pollutants and their ability to handle high-temperature and corrosive gas streams. They offer advantages such as relatively simple operation and the ability to cool hot gases, but they also generate wastewater that requires treatment.