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Clear liquor scrubbing magnesium-enhanced lime flue gas desulfurization system

  • US 5,340,547 A
  • Filed: 01/19/1993
  • Issued: 08/23/1994
  • Est. Priority Date: 11/22/1991
  • Status: Expired due to Fees
First Claim
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1. A magnesium-enhanced lime flue gas desulfurization system wherein sulfur dioxide is removed from a supply of sulfur dioxide-containing gas by scrubbing in the presence of aqueous magnesium and lime to produce easily dewatered calcium sulfite waste solids, said system comprising:

  • (a) scrubber means for receiving a supply of sulfur dioxide-containing gas and contacting said sulfur dioxide-containing gas with an aqueous liquid, said scrubber means including a first discharge outlet for scrubbed gas and a second discharge outlet for scrubber effluent;

    (b) crystallizer-clarifier reaction tank means fluidically connected to said scrubber means for receiving scrubber effluent and for separating said scrubber effluent into a clear liquor fraction and a thickened solids fraction;

    (c) premix slurry tank means fluidically connected to said crystallizer clarifier reaction tank means for receiving and crystallizing said thickened solids fraction, wherein said premix slurry tank means includes reagent addition means for adding reagent to said premix slurry tank means;

    pH control means for controlling crystal formation and growth, an inlet for receiving said thickened solids fraction from the crystallizer-clarifier reaction tank means and an outlet for directing crystallized solids back to said crystallizer-clarifier reaction tank means; and

    (d) solids dewatering means for separating solids recirculated through said crystallizer-clarifier reaction tank means and for producing an aqueous liquid fraction for circulation through the system to said scrubber means and to contact said sulfur dioxide-containing gas.

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