| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide 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. <P>SOLUTION: The exhaust gas purifying device comprises: 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; a 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 concentration measuring means, ejection of the aqueous urea solution by the aqueous urea solution ejecting means. <P>COPYRIGHT: (C)2010,JPO&INPIT |
