发明名称 Method for reducing concentration of nitrogen oxides in a stream of combustion products and apparatus for making the same
摘要 <p>A preferred process arrangement utilizes the enthalpy of the flue gas, which can be supplemented if need be, to convert urea ( 30 ) into ammonia for SCR. Urea ( 30 ), which decomposes at temperatures above 140 ° C., is injected ( 32 ) into a flue gas stream split off ( 28 ) after a heat exchanger ( 22 ), 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 ( 23 ) or the urea ( 30 ). This side stream, typically less than 3% of the flue gas, provides the required temperature and residence time for complete decomposition of urea ( 30 ). 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 ( 37 ) ahead of SCR using a blower ( 36 ). 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.</p>
申请公布号 CZ20030218(A3) 申请公布日期 2003.12.17
申请号 CZ20030000218 申请日期 2001.12.03
申请人 FUEL TECH, INC. 发明人 SUN WILLIAM H.;DE HAVILLAND PIERS;CUMMINGS WILLIAM E. JR.;CARMIGNANI PAUL G.;BOYLE JOHN M.
分类号 F01N3/08;B01D53/56;B01D53/86;B01D53/90;B01D53/94;F01N3/28;(IPC1-7):B01D53/56 主分类号 F01N3/08
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