Method of mercury removal in a wet flue gas desulfurization...

Details Method of mercury removal in a wet flue gas desulfurization... Method of mercury removal in a wet flue gas desulfurization...

B - Operations, Transporting

01

D

B01D 53/64 (2006.01) B01D 47/00 (2006.01) B01D 53/14 (2006.01) B01D 53/18 (2006.01) B01D 53/50 (2006.01)

Patent

CA 2626189

Controlling the reductive capacity of an aqueous alkaline slurry (23) in a wet scrubber makes it possible to accurately control the mercury emission from the scrubber to a desired value. One method of controlling the reductive capacity of the slurry is to measure the reduction-oxidation potential ("redox potential") of the aqueous alkaline slurry (23) and to add or remove substances that affect the redox potential and thus the reductive capacity of the slurry. In wet scrubbers in which limestone is used for absorption of acid gases and where a gypsum slurry is circulated, it has been found to be an attractive solution to control the amount of oxidation air blown into the scrubber in order to control the redox potential and thereby the mercury emissions.

Le contrôle de la capacité réductrice d'une boue aqueuse alcaline (23) dans un dispositif de lavage humide rend possible le contrôle précis de l'émission de mercure par ce dispositif à une valeur voulue. Une méthode pour contrôler la capacité réductrice de la boue consiste à mesurer le potentiel de réduction/oxydation (potentiel rédox) de la boue aqueuse alcaline (23) et d'ajouter ou d'éliminer des substances qui affectent le potentiel rédox et, donc, la capacité réductrice de la boue. Dans les dispositifs de lavage pour lesquels on utilise du calcaire pour absorber les gaz acides et dans lesquels une boue de gypse circule, on a trouvé que c'était une solution intéresante pour contrôler la quantité d'air d'oxydation envoyée dans le dispositif pour contrôler le potentiel rédox et, donc, les émissions de mercure.

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