The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 2006
Filed:
Dec. 03, 2001
William H. Sun, Lisle, IL (US);
William E. Cummings, Jr., Easton, CT (US);
Piers DE Havilland, Ticino, IT;
Paul G. Carmignani, Naperville, IL (US);
John M. Boyle, Oak Park, IL (US);
William H. Sun, Lisle, IL (US);
William E. Cummings, Jr., Easton, CT (US);
Piers de Havilland, Ticino, IT;
Paul G. Carmignani, Naperville, IL (US);
John M. Boyle, Oak Park, IL (US);
Fuel Tech Inc., Batavia, IL (US);
Abstract
A preferred process arrangement utilizes the enthalpy of the flue gas, which can be supplemented if need be, to convert urea () into ammonia for SCR. Urea (), which decomposes at temperatures above 140 ° C., is injected () into a flue gas stream split off () after a heat exchanger (), such as a primary superheater or an economizer. Ideally, the side stream would gasify the urea without need for further heating; but, when heat is required it is far less than would be needed to heat either the entire effluent () or the urea (). This side stream, typically less than 3% of the flue gas, provides the required temperature and residence time for complete decomposition of urea (). A cyclonic separator can be used to remove particulates and completely mix the reagent and flue gas. This stream can then be directed to an injection grid () ahead of SCR using a blower (). The mixing with the flue gas is facilitated due to an order of magnitude higher mass of side stream compared to that injected through the AIG in a traditional ammonia-SCR process.