The process of FGD(Flue Gas Desulfurization) is designed to absorb the sulfur dioxide in the flue gas before it is released. This is accomplished through either a wet or a dry process.
Dry Lime FGD
In the process of dry scrubbing injection systems, lime is used as a reagent to react and remove gaseous pollutants. There are two common dry methods, the dry injection system and spray drying systems. Each process injects lime into flue gas to remove SO2. A dry injection process injects dry hydrated lime directly into the flue gas duct, whereas the spray dry system injects atomized lime slurry into a separate vessel. Both methods yield a dry final product, collected in particulate control devices for further treatment.
Wet Lime FGD
The process of wet scrubbing typically utilizes an alkaline-based slurry of lime to scrub gases. A shower of lime slurry is then sprayed into a flue gas scrubber, where the SO2 is absorbed into the spray and becomes a wet calcium sulfite. One by-product of that sulfite is it can be converted to salable gypsum. Wet scrubbing provides high-efficiency sulfur dioxide removal capacity, in addition to reducing any scaling potential.
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Under the increasingly stringent environmental protection policy, limestone powder is widely used in construction materials, power plant desulfurization and other fields, which will bring more profit space.