Patent ID: 9457316
Filing Date: 2016-10-04
CPC Classification: B01D

Claim Text:
1. A method for controlling the oxidation-reduction potential in a recirculation tank, or an absorber recirculation tank, of a wet flue gas desulfurization unit, the method comprising the steps of: (i) supplying at least one reducing agent to a slurry, or a solution, portion of the recirculation tank, or the absorber recirculation tank, or at least one recirculation pump thereto so that the at least one reducing agent is supplied to the wet flue gas desulfurization unit recirculation tank or absorber recirculation tank; and (ii) permitting the at least one reducing agent to react with one or more oxidizing compounds and/or ions present in the slurry, or the solution, portion of the recirculation tank, or the absorber recirculation tank or the at least one recirculation pump thereto, so as to achieve a reduction in the oxidation-reduction potential of the slurry, or the solution, in the recirculation tank, or the absorber recirculation tank, or in the at least one recirculation pump thereto, or in a combination of the recirculation tank, or the absorber recirculation tank, and the at least one recirculation pump thereto so that an amount of at least one insoluble precipitate compound in the recirculation tank, or the absorber recirculation tank, is controlled, prevented, or eliminated by the addition of the at least one reducing agent, wherein the at least one reducing agent is selected from iron (II) sulfate (FeSO