With a wet scrubber, gas is passed through an area and sprayed with a wet substance. Water or other chemicals can be used when dust and particulate matter is to be removed. These chemicals are chosen to specifically react with certain airbone contaminants - generally acidic gases. This process adds a large amount of vapour to the exhaust gas.
1. OPERATION RULE:
Wet scrubbers are a special device used to remove a variety of pollutants from exhaust gas from manufacturing plants or other places. These devices use a scrubbing liquid to remove the pollutants. The exhaust gas is moved through the scrubbing chamber. When the gas is sprayed with the fluid, the heavier pollutants are pulled out of the gas and attach to the liquid because of its chemical composition. As the gas is passed through the cleaning mist, the contaminants are attracted to the mist and left behind.
Regardless of which method of introducing the scrubbing fluid is used, most wet scrubbers are similar in design. Misting is a common method of exhaust gas treatment. A typical scrubber is composed of ductwork and a fan system to force gas through its chambers. There is also a pump, and a collecting area for used scrubbing liquid. The liquid sprayed through the exhaust collects at the bottom of the scrubbing chamber. This liquid is funneled away and filtered to eliminate potentially harmful materials contained in it. This liquid cannot simply be thrown away or reused because of its chemical content.
These scrubbers are used frequently in manufacturing plants that process propane and other types of natural gas.
2. ADVANTAGES AND DISADVANTAGES:
First and foremost, these scrubbers are beneficial as they prevent a wide range of pollutants from entering the environment. Moreover, these units are fairly sturdy and can tolerate a wide range of temperatures - this makes them ideal for operation in almost any environment. Wet scrubbers, additionally, can be used to remove a wide range of pollutants from mercury to acidic gases.
Despite the advantages, there are a few drawbacks. These machines require frequent maintenance, and they can suffer from corrosion quite severely. However, these machines can be used for many years if they are maintained or vented frequently.
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