Barrier discharge conversion of Hg, SO2 and NOx
Patent 6117403 Issued on September 12, 2000. Estimated Expiration Date: 
December 29, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 29, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3745751 3856476 Process for utilizing collected material removed from effluent gas Method for removing sulfur dioxide from a gas stream Method for corona discharge enhanced flue gas clean-up Combined electrostatic precipitator and acidic gas removal system Removal of nitric oxide from waste gases and recovery as nitric acid Process and apparatus for electrostatic purification of dust- and pollutant-containing exhaust gases in multiple-field precipitators NOx reduction by sulfur tolerant coronal-catalytic apparatus and method Pulse method for sulfur dioxide electrolysis InventorsAssigneeApplicationNo. 214358 filed on 12/29/1998US Classes:423/210, MODIFYING OR REMOVING COMPONENT OF NORMALLY GASEOUS MIXTURE95/59, Electrode treating (e.g., coating, cleaning, etc.)95/65, Liquid addition precedes electrical precipitation95/75, By liquid flushing96/53, Liquid spray means96/77, Serially arranged ionizing and collecting or agglomerating fields96/79, Collecting electrodes are flat plates96/86, Parallel disk or plate collector unit204/157.3, Removing a component from normally gaseous mixture204/157.46, Nitrogen containing product produced204/157.49, Sulfur containing product produced204/174, Sulfur-oxygen compounds204/177, Nitrogen compounds422/169, Including means providing sequential purification stages422/172, And means downstream of a stage for injecting a reactant into waste gas for interreaction in subsequent stage422/174, Electrical type423/215.5, Solid component423/235, Nitrogen or nitrogenous component423/242.1Sulfur or sulfur containing componentExaminersPrimary: Tran, HienAttorney, Agent or FirmInternational ClassesB03C 003/00B03C 003/16 AbstractA process and apparatus for reducing particulate, nitrogen oxides ("NOx"), sulfur dioxide ("SO2 "), and mercury ("Hg") emissions from the combustion exhaust of fossil fuel fired plants while producing an end product that is commercially useful, comprising the steps of oxidizing Hg, NOx and SO2 using a barrier, pulse, corona, or electron beam electrical discharge apparatus (100) to produce HgO and the acids HNO3 and H2 SO4 collecting the HgO, acids and particulates in a wet ESP (120), and separating the particulates from the collected acid mixture, then separating and concentrating the acids for industrial use.Other References
Field of SearchWaste gas purifierIncluding means providing sequential purification stages Plural chemical reaction stages Solid, extended surface, fluid contact type And means downstream of a stage for injecting a reactant into waste gas for interreaction in subsequent stage And contact regenerating means or means for cleaning an internal surface of the reaction chamber Electrical type Electrode treating (e.g., coating, cleaning, etc.) Liquid addition precedes electrical precipitation By liquid flushing Liquid spray means Serially arranged ionizing and collecting or agglomerating fields Collecting electrodes are flat plates Parallel disk or plate collector unit MODIFYING OR REMOVING COMPONENT OF NORMALLY GASEOUS MIXTURE Nitrogen or nitrogenous component Sulfur or sulfur containing component Solid component Removing a component from normally gaseous mixture Nitrogen containing product produced Sulfur containing product produced Sulfur-oxygen compounds Nitrogen compounds |
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