How Do Dry Scrubbers Work? Harmful materials can easily be found in industrial exhaust gases. Before releasing these gases into the atmosphere these harmful materials need to be removed. It is for the purpose of removing these harmful materials that the dry scrubber system is used. Dry scrubber systems are just one type of scrubber used for the removal of harmful materials in exhaust gases. 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. How a dry scrubber works is much the same as how other scrubbers do. 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. 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. The vented exhaust gases may look dark of invisible since no vapor is added in the process. The main use of dry scrubbers is to remove acid gases from combustion sources. The way it is done is by introducing dry reactants to exhaust gas at speeds that are very high. The result of this is that the pollutants get neutralized in the gas. There are steps by which this is done. First is the cooling of the gas. 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. In this system of gas cooling, the purpose of cooling the emission gases makes it a lot easier to eliminate pollutants and other toxins from the gas. Diluting exhaust gas can be done using evaporative cooler. After cooling the gas, the reagent can already be injected. In this step the harmful components of the gas are removed. If a dry reagent has neutralizing properties, then it is chosen as a component of the dry reagent mixture. Sodium bicarbonate is almost always chosen because of this property. Different kinds of powders are mixed together and injected at high pressures into the exhaust gas. 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. The used scrubbing powder is then captured through a fabric filter and the cleaned gas goes out of the scrubbing chamber. IF the used scrubbing powder is cleansed, it can be reused for another dry scrubbing. However, it should also be disposed of frequently since it really cannot be washed properly.
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Dry scrubbing is very good for the environment. Removing hazardous substance from exhaust gas prevents pollutants to escape into the environment.