Method for reducing the content of fine material in FGD gypsum
AssigneeAndritz Inc.
InventorsMichael Kramer, Andreas Gruber-Waltl
Life of this patent
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Abstract
A method for obtaining gypsum using a flue-gas desulfurization system (FGD) having a gypsum suspension, which includes fine materials such as active carbon particles or residual carbonate particles for example, accumulates in the scrubber of a wet flue gas scrubber. The gypsum-containing suspension is thickened by at least one hydrocyclone, and the thickened gypsum suspension is discharged via the underflow of the hydrocyclone. Water is fed to the hydrocyclone in addition to the gypsum suspension via a dedicated feed line such that the content of fine material is thus reduced with respect to the suspension volume in the underflow.
Claims9
A method for the recovery of gypsum with the aid of a flue gas desulfurization plant, a gypsum suspension, which also contains fine material occurring in the scrubber of a wet flue gas scrub, and the gypsum-containing suspension being thickened by means of at least one hydrocyclone, and the thickened gypsum suspension being discharged via the underflow of the hydrocyclone, wherein water is supplied to the hydrocyclone via a dedicated supply line in addition to the gypsum suspension, thereby resulting in the fine material depletion in relation to the suspension volume in the underflow, the water being administered in the inflow region or in the conical region of the hydrocyclone as a barrier water stream to form a barrier water layer, and the barrier water stream and the gypsum suspension being separated in the hydrocyclone by a lamella until the barrier water flow and gypsum suspension flow have become essentially stable.
Dependencies are inferred from the claim text.