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All About Dry Scrubbers There are harmful materials 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. These scrubbers use dry substances which can remove acidic gases responsible for acid rain. Like other scrubbers, dry scrubbers work in a similar manner. 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. The reaction is dependent on the type of material that they need to remove. There are some materials that neutralize harmful pollutants in the stream through the chemical reaction. The material can turn into another substance upon reacting with the reagents. 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. The way it is done is by introducing dry reactants to exhaust gas at speeds that are very high. What this causes is the neutralization of the pollutants in the gas. In three steps, the process is completed. Gas cooling is done first. After that is the injection of the reagent followed by filtration.
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The preparation of the exhaust gases starts by cooling them. The gas needs to be cooled because it becomes much easier to eliminate pollutants and other toxins from the gas. Diluting exhaust gas can be done using evaporative cooler. The reagent is then injected when the gas is cooled. In this step the harmful components of the gas are removed. 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. What is injected into the exhaust gas at very high pressures are different kinds of mixed powders. There are chemical reactions produced when the dry reagents are introduced and this causes the acidity of the gas to be reduced and it also eliminates the harmful pollutants. Finally the cleaned gas goes out of the scrubbing chamber while the scrubbing powder that was used is filterer using a fabric filter. IF the used scrubbing powder is cleansed, it can be reused for another dry scrubbing. It cannot be used over and over and it has to be disposed of frequently since proper cleaning is not really possible.
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The impact of dry scrubbing on the environment is something positive. Removing hazardous substance from exhaust gas prevents pollutants to escape into the environment.