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How Do Dry Scrubbers Work?

Industrial exhaust gases contain a lot of harmful materials. It is essential for these harmful materials to be removed before releasing them into the atmosphere. And the dry scrubber system is used for this purpose. Dry scrubber systems are just one type of scrubber used for the removal of harmful materials in exhaust gases. The dry scrubber system is mainly used in many plants today. These scrubbers use dry substances which can remove acidic gases responsible for acid rain.

Like other scrubbers, dry scrubbers work in a similar manner. The method of dry scrubbing involves a collection of dry reagents sprayed into an exhaust stream. There are different ways by which these chemicals react. The reaction is dependent on the type of material that they need to remove. Through chemical reaction, some materials neutralize harmful pollutants in the stream. And some of these will cause a chemical reaction which transforms into a different substance altogether. And this newly formed substance is then caught in the particle stream or falls out of the gas stream. When the treated exhaust gases are vented out, they look dark or sometimes are invisible since there is no vapors added in the process.

The main use of dry scrubbers is to remove acid gases from combustion sources. The process of dry scrubbing is done by spraying dry reactants to exhaust gas at very high speeds. 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. The reagent is then injected and then the gas is filtered.
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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. 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. 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. Finally, a fabric filter is used to capture the used scrubbing power while the cleaned gas goes out of the scrubbing chamber. Sometimes the dry powder can be cleaned for reuse. 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. If hazardous substances are removed from exhaust gases then these pollutants will no longer be released into the atmosphere.

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