Patent ID: 7575625

Claim:
A method for separating a solid from a gas scrubber, comprising: collecting a solids burden not collected at a solids-collection device of a flue gas desulfurization system by adding at least one flocculant, flocculation aid or mixtures thereof, while using a separating device; wherein said flocculant, flocculation aid or mixtures thereof are a cationic acrylic acid or methacrylic acid ester or copolymer of such ester with acrylamide; wherein the addition of the flocculant, flocculation aid or mixtures thereof into the separating device results in agglomeration of the particles, the agglomerated particles having a particle and/or floc diameter of at least >15 μm; wherein said flue-gas desulfurization system comprises at least one absorption device, which is disposed downstream from said solids-collection device, wherein absorption device is a prescrubber of said flue-gas desulfurization system; wherein a proportioning device for proportioning the flocculant and/or flocculation aid is disposed upstream from the separating device; and said separating device is integrated in a prescrubber circuit; and wherein the solids burden in the absorption device is less than 2 g of solids per liter of scrubbing fluid.