Emission treatment system

B - Operations – Transporting – 01 – D

Patent

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B01D 53/86 (2006.01)

Patent

CA 2501997

An emission treatment system for removing NOx from flue gas includes a diversion member 34 that closes the stack 22 at a position intermediate the inlet and outlet ends. A major component module 26 includes a first submodule, having an inlet and an SCR segment 28, a second sub-module, having a heat exchange segment 30, and a third sub-module, having an ID fan 32 and an outlet, forming a flue gas flow path extending from the inlet to the outlet. Inlet ductwork 40, which is in fluid communication with the stack 22 at a position intermediate the inlet end of the stack 22 and the diversion member 34, provides a passageway from the stack 22 to the inlet. Outlet ductwork 44, which is in fluid communication with the stack 22 at a position intermediate the diversion member 34 and the outlet end of the stack 22, provides a passageway from the outlet to the stack 22. An ammonia addition subsystem 54 injects ammonia vapor into the inlet ductwork 40.

L'invention concerne un système de traitement d'émissions pour évacuer NOx des gaz de combustion qui comporte un élément de déviation (34) qui ferme la colonne (22) entre les extrémités d'admission et de sortie. Un module de composant majeur (26) comporte un premier sous-module ayant une admission et un segment SCR (28), un deuxième sous-module ayant un segment échangeur thermique (30) et un troisième sous-module ayant un ventilateur à tirage induit (32) et une sortie, formant un chemin d'écoulement des gaz de combustion allant de l'admission à la sortie. Une gaine d'admission (40), en communication fluidique avec la colonne (22) entre l'extrémité d'admission de la colonne (22) et l'élément de déviation (34), fournit un passage de la colonne (22) à l'admission. La gaine de sortie (44), en communication fluidique avec la colonne entre l'élément de déviation (34) et l'extrémité de sortie de la colonne (22), fournit un passage de la sortie à la colonne (22). Un sous-système d'addition d'ammoniac (54) injecte de la vapeur d'ammoniac dans la gaine d'admission (40).

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