| 摘要 |
The present exhaust treatment system comprises: - a first oxidation catalyst (311 ) arranged to oxidize compounds comprising one or several of nitrogen, carbon and hydrogen; - a first dosage device (371 ), arranged downstream of said first oxidation catalyst (311 ), and arranged to supply a first additive into the exhaust stream; - a first reduction catalyst device (331 ), arranged downstream of said first dosage device, including a slip-catalyst primarily for reduction of nitrogen oxides (NOx), and secondarily for oxidation of additive; - a second oxidation catalyst (312) arranged downstream of said first reduction catalyst (331 ); - a particulate filter (320) arranged downstream of said second oxidation catalyst (312); - a second dosage device (372), arranged downstream of said particulate filter (320), and arranged to supply a second additive into said exhaust stream; - a second reduction catalyst device (332), arranged downstream of said second dosage device (372), and arranged for reduction of nitrogen oxides in said exhaust stream through the use of at least one of said first and said second additive. |
