Alstom Technology Limited

Kelly L Barger

Michael G Varner

Gregg R Doule

Gregg Robert Doulé

One aspect of the invention relates to a method for removing contaminants from a flue gas stream (). The method includes: removing fly ash from a flue gas stream () utilizing a particle collector (); contacting the flue gas stream with an alkaline reagent in a wet scrubber (); discharging a purge liquid () from the wet scrubber (); and, combining at least a portion of the purge liquid with at least a portion of fly ash circulating within a dry circulating fluid bed scrubber () to form moistened fly ash ().

Reduced liquid discharge in wet flue gas desulfurization

One aspect of the invention relates to a method for removing contaminants from a flue gas stream (). The method includes: removing fly ash from a flue gas stream () utilizing a particle collector (); contacting the flue gas stream with an alkaline reagent in a wet scrubber (); discharging a purge liquid () from the wet scrubber (); combining at least a portion of the purge liquid () with at least a portion of the fly ash () to form moistened fly ash (); and injecting at least a portion of the moistened fly ash () into the flue gas stream () upstream of the particle collector (), whereby the moistened fly ash () removes at least a portion of contaminants present in the flue gas stream ().

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Kingston, TN, United States of America

Kelly L Barger