[Answer] What is a wet scrubber?

Answer: devices that are used to remove various types of pollutants from the gas streams in a furnace flue or other device.
What is a wet scrubber?

Some advantages of wet scrubbers over these devices are as follows:

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The term wet scrubber describes a variety of devices that remove pollutants from a furnace flue gas or from other gas streams. In a wet scrubber the polluted gas stream is brought into contact with the scrubbing liquid by spraying it with the liquid by forcing it through a pool of liquid or by some other contact method so as to remove the pollutants.

The design of wet scrubbers or any air pollution control device depends on the industrial process conditions and the nature of the air pollutants involved. Inlet gas characteristics and dust properties (if particles are present) are of primary importance. Scrubbers can be designed to collect particulate matter and/or gaseous pollutants. The versatility of wet scrubbers allow them to be built in numerous …

The design of wet scrubbers or any air pollution control device depends on the industrial process conditions and the nature of the air pollutants involved. Inlet gas characteristics and dust properties (if particles are present) are of primary importance. Scrubbers can be designed to collect particulate matter and/or gaseous pollutants. The versatility of wet scrubbers allow them to be built in numerous configurations all designed to provide good contact between the liquid and polluted gas stream. Wet scrubbers remove dust particles by capturing them in liquid droplets. The droplets are then collected the liquid dissolving or absorbing the pollutant gases. Any droplets that are in the scrubber inlet gas must be separated from the outlet gas stream by means of another device referred to as a mist eliminator or entrainment separator (these terms are interchangeable). Also the resultant scrubbing liquid must be treated prior to any ultimate discharge or being reused in the plant. A wet scrubber’s ability to collect small particles is often directly proportional to the power input into the scrubber. Low energy devices such as spray towers are used to collect particles larger than 5 micrometers. To obtain high efficiency removal of 1 micrometer (or less) particles generally requires high-energy devices such as venturi scrubbers or augmented devices such as condensation scrubbers. Additionally a properly designed and operated entrainment separator or mist eliminator is important to achieve high removal efficiencies. The greater the number of liquid droplets that are not captured by the mist eliminator the higher the potential emission levels. Read more on Wikipedia

The exhaust gases of combustion may contain substances considered harmful to the environment and the scrubber may remove or neutralize those. A wet …

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