| 摘要 |
The present invention is a combustion system employing a urea-to-ammonia vapor reactor system. The urea-to-ammonia reactor housing enclosed in a bypass flow duct that receives a secondary flue gas stream at a split point from a main flue gas stream containing nitrogen oxides (NOx) emanating from a boiler. The bypass flow duct allows the secondary flue gas stream to flow past the enclosed reactor housing where injected aqueous urea in atomized or non-atomized form, is gasified to ammonia vapor. The resulting gaseous mixtures of ammonia, its by-products and the secondary flue gas stream subsequently rejoin the main stream, before the main flue gases are treated through a Selective Catalytic Reduction (SCR) reactor apparatus. A residence time of the secondary stream within the bypass flow duct, which may be increased by a recirculation loop, enables effective conversion of urea to ammonia to be used in the SCR apparatus. |
| 主权项 |
1. An assembly for converting aqueous urea into vapor ammonia comprising:
a. a bypass flow duct having a gas flow inlet, a gas flow outlet, and one or more enclosure walls that define a first interior space disposed between said gas flow inlet and said gas flow outlet; b. a reactor disposed within said bypass flow duct, wherein said reactor comprises:
i. a housing having:
a first outer surface exposed to said first interior space and one or more reactor walls that define a second interior space, wherein at least a portion of said first outer surface has a shape that creates a pressure differential zone between said second interior space and said first interior space, anda first opening in said housing, wherein said first opening is in said first outer surface, has a cross-sectional area that is less than about 35% of said first outer surface, and is disposed proximal to said pressure differential zone; andii. an aqueous urea inlet in fluid communication with said second interior space. |
