The present invention relates to a method for operating a flue gas desulfurization device for a brown coal dust fired power plant. Dollars a of the invention it is the object of the optimum conditions for the increase in the broken, for the improvement of the gypsum quality and for the increase in the degree of efficiency with simultaneous reduction of the salt load to be found. Dollars a this is achieved in that, dollars a - in the suspension from the bottom of the gas washer 7 for the lower spray plane (or lower spray planes the entire quick lime - suspension in a function of the so φ 2 φ - content of the flue gas is introduced and the upper spray planes with the suspension of the bottom of the gas washer be acted upon, dollar a - of the ph - value in the lower spray planes is set so high that a high efficiency can be achieved and the salt load is reduced, dollars a - of the ph - value in the sump is set so low that good oxidation conditions are achieved for the industry as well as a suitable gypsum quality is achieved.
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