Method for controlling the production of ammonia from urea for NOx scrubbing
October 25, 2020. 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 ReferencesReduction of nitrogen-based pollutants through the use of urea solutions containing oxygenated hydrocarbon solvents Reduction of nitrogen- and carbon-based pollutants Methods of removing NOx and SOx emissions from combustion systems using nitrogenous compounds Synthetic ammonia process Reduction of nitrogen- and carbon-based pollutants Catalytic denitrification control process and system for combustion flue gases Process for controlling acid gas emissions in power plant flue gases Aqueous ammonia injection scheme Methods for enlarging the useful temperature window for NOx reduction in combustion systems 5118481 InventorsApplicationNo. 697263 filed on 10/25/2000US Classes:423/235, Nitrogen or nitrogenous component423/239.1, Utilizing solid sorbent, catalyst, or reactant423/358From organic material containing nitrogenExaminersPrimary: Griffin, Steven P.Assistant: Medina, Maribel Attorney, Agent or FirmInternational ClassB01D 053/56AbstractA process to provide a pressurized gas stream useful for removing nitrogen oxides from a combustion gas stream by hydrolyzing urea in aqueous solution in a closed reactor to evolve gaseous ammonia at a rate essentially balanced to the amount required from the combustion gas stream. The improvement resides in maintaining the pressure in the reactor within a preselected range when the demand for ammonia for external use suddenly drops by cooling the solution within the hydrolysis reactor by heat exchange either within or external to the reactor in response to rapid changes in demand for ammonia required to remove said nitrogen oxides. |
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