EP 3 170 547 A1

Flue gas desulfurization apparatus and method of operating same

(22) 17.07.2015

(43) 24.05.2017

(57) Provided is a method of operating a flue gas desulfurization apparatus, in which gypsum slurry containing gypsum, which is obtained by bringing sulfur oxide contained in flue gas discharged from a combustion device including a boiler into contact with an absorbing solution composed of lime slurry in an absorption tower 1 and then subjecting the same to oxidation, is withdrawn from the absorption tower 1, and said gypsum slurry is supplied into a gypsum slurry tank 6 for supplying the gypsum slurry into dehydration equipment by using a pump 5 or is circulated to the absorption tower 1. In order to reduce the capacity of the pump 5 and thereby conserve pump power, the gypsum slurry is switched to being supplied into the gypsum slurry tank 6 or being circulated to the absorption tower 1 depending on the solid content concentration of the gypsum slurry withdrawn from the absorption tower 1.

(71) Mitsubishi Hitachi Power Systems, Ltd., Yokohama-shi, Kanagawa 220-8401 (JP)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES Fl FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: MA

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