| 摘要 |
<p>Exhaust gas is conducted via a selective catalytic reduction (SCR) catalytic converter (3) for the reduction of nitrogen oxides to form nitrogen, via an oxidation catalytic converter (4) for the oxidation of carbon monoxide and hydrocarbons to form carbon dioxide, and through a diesel particle filter (5) for the removal of particles. Urea solution, or a solution of some other water-soluble compound which releases ammonia, is used as a reducing agent. The reducing agent is dosed into the exhaust section upstream of the charging turbine (1). Exhaust gas generated by a diesel engine with a charging turbine and which, in addition to carbon monoxide, hydrocarbons, and particles, contain nitrogen oxides with a nitrogen-dioxide/nitrogen oxide ratio of 0.3-0.7, is conducted via a selective catalytic reduction (SCR) catalytic converter for the reduction of nitrogen oxides to form nitrogen, via an oxidation catalytic converter for the oxidation of carbon monoxide and hydrocarbons to form carbon dioxide, and through a diesel particle filter for the removal of particles. Urea solution, or a solution of some other water-soluble compound which releases ammonia, is used as a reducing agent for the SCR reaction. The reducing agent is dosed into the exhaust section upstream of the charging turbine. An independent claim is included for exhaust-gas purification device.</p> |
