Dry scrubber systems spray a collection of dry reagents into the exhaust. These reagents can have a number of different effects depending on the material they target. Some will simply neutralize a harmful material through a chemical reaction. Others cause a material to react and accrete into a different substance that is large enough to fall out of the gas stream or be caught in a particle screen. Since the vapor in these gasses is very low, they are typically dark or invisible when vented.
The system produces very little waste material, at least when compared to a wet scrubber. Most of the material sprayed into the exhaust stream is allowed to leave, burn off in the heat of the stream or be caught in a filter. As a result, the collection requirements for a dry scrubber system are much less than for a wet one. This reduces the cost of the system as well as removes the cost of transporting and storing the waste water.
In modern plants, dry scrubbing is more common by far, but wet scrubbing still has its uses. Some contaminants, such as mercury, are extremely harmful and can only be removed by a wet compound. The other common use for a wet system is heat dissipation and recycling. A wet system will collect, and potentially repurpose, heat before gas is vented. This is both better for the environment and allows a company to recoup some of the expense of the wet scrubber system.
Dry scrubber systems spray a collection of dry reagents into the exhaust. These reagents can have a number of different effects depending on the material they target. Some will simply neutralize a harmful material through a chemical reaction. Others cause a material to react and accrete into a different substance that is large enough to fall out of the gas stream or be caught in a particle screen. Since the vapor in these gasses is very low, they are typically dark or invisible when vented.
The system produces very little waste material, at least when compared to a wet scrubber. Most of the material sprayed into the exhaust stream is allowed to leave, burn off in the heat of the stream or be caught in a filter. As a result, the collection requirements for a dry scrubber system are much less than for a wet one. This reduces the cost of the system as well as removes the cost of transporting and storing the waste water.
In modern plants, dry scrubbing is more common by far, but wet scrubbing still has its uses. Some contaminants, such as mercury, are extremely harmful and can only be removed by a wet compound. The other common use for a wet system is heat dissipation and recycling. A wet system will collect, and potentially repurpose, heat before gas is vented. This is both better for the environment and allows a company to recoup some of the expense of the wet scrubber system.
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