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Why Dry Scrubbers are Good for the Environment Harmful materials can easily be found in industrial exhaust gases. We don’t want these gases to be released into the atmosphere without removing all the harmful materials in it. It is for the purpose of removing these harmful materials that the dry scrubber system is used. Among all the systems or types of scrubbers used to remove hazardous materials from exhaust gases, the dry scrubber system is one of them. Many plants today use the dry scrubber system. Dry substances are used in the dry scrubber systems which are able to remove acid gases mainly responsible for acid rain. Dry scrubbers work like any other kind of scrubber. In dry scrubbing, they spray the exhaust stream with a collection of dry reagents. With the introduction of these chemicals, a chemical reactions is produced which work in different ways. Depending on the materials that needs to be removed, the chemical reaction takes place. One results of the chemical reaction is that some materials are able to neutralize harmful pollutants in the stream. Another type of chemical reaction turns the material into a different substance. What happens to this new substance is that it either falls out of the gas stream or gets caught in a particle screen. Since no vapor is added in the process, the treated exhaust gases look dark or invisible. Dry scrubbers are mainly used to eliminate gases from sources of combustion. At very high speed, dry reactants are introduced to the exhaust gases, and this is how dry scrubbing is done. The pollutants are neutralized in the gas with this process. There are steps by which this is done. First is the cooling of the gas. Then the reagent is injected, and then it is filtered.
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The preparation of the exhaust gases starts by cooling them. Pollutants and other toxins can easily be removed from the gas if the gas is cooled. Diluting exhaust gas can be done using evaporative cooler. The reagent is then injected when the gas is cooled. This is the step where the harmful components are eliminated from the gas. Because of their neutralizing properties, components of the dry reagent are generally chosen. Since sodium bicarbonate has this property it is most of the time included in the mixture of dry reagents. The different kinds of powders which are mixed together are then injected at high pressures into the exhaust gas. This induces chemical reaction which results in the reduction of acidity of the gas and the harmful pollutants are eliminated. The used scrubbing powder is then captured through a fabric filter and the cleaned gas goes out of the scrubbing chamber. The used scrubbing powder can be reused for dry scrubbing after being cleansed. But since it cannot be washed properly, it has to also be disposed of frequently.
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Dry scrubbing is very good for the environment. If hazardous substances are removed from exhaust gases then these pollutants will no longer be released into the atmosphere.