Flue gas purifying device

F - Mech Eng,Light,Heat,Weapons – 01 – N

Patent

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Details

F01N 3/08 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01) F01N 3/20 (2006.01) F01N 3/28 (2006.01)

Patent

CA 2745623

An exhaust gas purifying device configured in such a manner that ammonia is less likely to leak and nitrogen oxide in exhaust gas can be efficiently reduced. An exhaust gas purifying device comprising: exhaust piping; an aqueous urea solution ejecting means for ejecting an aqueous urea solution into the exhaust piping; a catalyst means mounted downstream of the position at which the aqueous urea solution is ejected and provided with a urea-SCR catalyst for promoting reaction between nitrogen oxide and ammonia and with a support mechanism provided in the exhaust piping and supporting, inside the exhaust piping, the urea-SCR catalyst; an ammonia concentration measuring means provided downstream of the catalyst means in the direction of flow of the exhaust gas and measuring the concentration of the ammonia in the exhaust gas having passed through the urea-SCR catalyst; and a control means for controlling, on the basis of the concentration of the ammonia measured by the ammonia concentration measuring means, ejection of the aqueous urea solution by the aqueous urea solution ejecting means.

Linvention concerne un dispositif d'épuration des gaz d'échappement configuré pour réduire les fuites dammoniac et la présence doxyde dazote dans les gaz d'échappement de manière efficace.  Le dispositif d'épuration des gaz d'échappement comprend les éléments suivants : une tuyauterie déchappement ; un moyen d'éjection de solution d'urée aqueuse permettant d'éjecter une solution d'urée aqueuse dans la tuyauterie déchappement ; un moyen catalyseur monté en aval de la position á laquelle la solution d'urée aqueuse est éjectée et pourvu dun catalyseur urée/SCR favorisant une réaction entre loxyde dazote et lammoniac et dun mécanisme support disposé dans la tuyauterie déchappement et supportant, à l'intérieur de la tuyauterie déchappement, le catalyseur urée/SCR ; un moyen de mesure de concentration dammoniac disposé en aval du moyen catalyseur dans le sens d'écoulement des gaz d'échappement et mesurant la concentration dammoniac dans les gaz déchappement ayant traversé le catalyseur urée/SCR ; et un moyen de commande permettant de commander, sur la base de la concentration dammoniac mesurée par le moyen de mesure de concentration dammoniac, léjection de la solution d'urée aqueuse grâce au moyen d'éjection de solution d'urée aqueuse.

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