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Comment Separation Processes

Wet Scrubbers

By Chemical Engineering |

Wet fluegas desulfurization (FGD), also known as wet-scrubbing, is a popular pollution-abatement technique for removing acid gases, such as SO2 and HCl from fluegas produced during coal-fired power generation and industrial combustion processes. Wet scrubbing is used in association with power generation, thermal oxidizers, kilns, incinerators, boilers, foundries and other combustion units. Also, wet-scrubbing can be used to treat other sulfur- or acid-laden fluegas streams produced in petroleum refining, metal smelting, gas processing and other chemical and pharmaceutical operations. The reliable operation of wet scrubbers has a direct impact on a facility’s ability to ensure regulatory compliance with mandated SO2 limits. Problems with the mist eliminators can lead to unplanned or excessive downtime of the wet-scrubbing system. Operation In a wet-scrubbing system, an incoming sulfur-laden exhaust stream is contacted by a circulating stream of an alkaline solution (most often a slurry of caustic reagents). Contact between the two streams converts the acid gases in the exhaust to neutral salts and other solid byproducts that are eventually removed. The pH of the resulting fluegas is 7–8. The most widely used reagents are…
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