Process for controlling acid gas emissions in power plant flue gases
Patent 5058514 Issued on October 22, 1991. Estimated Expiration Date: 
September 17, 2010. 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.
September 17, 2010. 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 ReferencesUrea reduction of NOx in fuel rich combustion effluents Method for reduction of sulfur products in the exhaust gases of a combustion chamber Methods of removing NOx and SOx emissions from combustion systems using nitrogenous compounds Patent #: 4851201 InventorsApplicationNo. 583210 filed on 09/17/1990US Classes:110/345, Exhaust gas; e.g., pollution control, etc.110/344, Combustion product423/235, Nitrogen or nitrogenous component423/239.1, Utilizing solid sorbent, catalyst, or reactant423/243.08, Alkali or alkali earth compound reactant423/244.05Reactant added to fuel for reaction in gas mixtureExaminersPrimary: Favors, Edward G.Attorney, Agent or FirmInternational ClassesF23J 011/00F23J 015/00 AbstractAn in-furnace sorbent slurry injection process for the simultaneous control of SO2 and NOx from power plant flue gases is described. An aqueous slurry of limestone or dolomite-doped limestone and a nitrogenous progenitor compound is injected into the furnace at temperatures ranging between 900° C. and 1350° C. Under optimized operating conditions, with urea selected as the nitrogenous progenitor, about 80% of the SO2 and 90% of the NOx are simultaneously removed. |
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