| 摘要 |
<p>The system has selective catalytic reduction (SCR) catalytic converter (6) and a part of exhaust gas stream (11) is branched off from exhaust gas stream (10) upward to the SCR converter. An oxidation catalyst (16) is arranged in a part of exhaust gas stream upstream to the supply area for reducing agent, which gives a reversal of the exhaust gas stream towards combustion engine with the engine operating conditions, by which back-flowing ammonia or back-flowing reducing agent oxidizes the decomposition products. The attachment device (9) adds the reducing unit into the part of exhaust gas stream. The reducing agent downstream of supply area is a material that separate hot exhaust gas ammonia or the reducing agent is ammonia.</p> |
