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System and method for controlling one or more process parameters associated with a combustion process

  • US 10,018,356 B2
  • Filed: 03/15/2013
  • Issued: 07/10/2018
  • Est. Priority Date: 07/12/2012
  • Status: Active Grant
First Claim
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1. A method for optimizing a wet flue gas desulfurization unit, the method comprising the steps of:

  • (I) measuring, analyzing and/or controlling at least one parameter selected from the chemistry in the flue gas and/or absorber tank of the WFGD;

    (II) generating data from the at least one parameter of Step (I); and

    (III) using the data generated in Step (II) to adjust at least one operational parameter selected from at least one reagent feed flow to the wet flue gas desulfurization unit,wherein Step (III) comprises 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;

    (A) supplying an aqueous solution of 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 so that the at least one reducing agent is supplied to the wet flue gas desulfurization unit recirculation tank or absorber recirculation tank; and

    (B) 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, 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, or in a combination of the recirculation tank, or the absorber recirculation tank, and the at least one recirculation pump 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 phosphorous acid (H3PO3), iron (II) ammonium sulfate ((NH4)2Fe(SO4)2), hydroxylamine hydrochloride (HONH2.HCl), hypophosphorous acid (H3PO2), or a combination of any two or more thereof.

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