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Causes of Scaling in FGD SystemsWet/dry Interface:• Occurs in area of absorber where hot flue gasis quenched• Scaling results from fluctuations in gas flowand gas distribution. Causes areas along ductwalls or other internal structures to vary fromwet to dry• If slurry is carried back into this area, it maydry and accumulate as a hard scale composedof calcium sulfate, and/or fly ash
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