| 摘要 |
[OBJECT] To provide an exhaust gas emission purifying device in a more compact size, and to prevent a decrease in catalytic performance due to the adsorption of intermediates such as ammonium sulfate even if the fuel contains a large quantity of sulfur compounds. [MEANS] An exhaust gas emission purifying device 1 provided with an exhaust manifold 6 which collects an exhaust gas discharged from exhaust connection pipes 3 connected to exhaust ports 2a of an engine 2, and which leads the exhaust gas into an exhaust passageway 5 upstream of a turbine 4a of a turbocharger 4, and further provided with a denitration catalyst apparatus 7 disposed in the exhaust passageway 5, and also provided with an evaporation tube 8 disposed within the exhaust manifold 6, the evaporation tube 8 having one end 8a connected to the exhaust passageway 5 and the other end 8b opening into the exhaust manifold 6. In addition, there is provided a nozzle 9 that sprays an aqueous solution of urea 9a into the exhaust gas as it passes through the evaporation tube 8. [ADVANTAGEOUS EFFECTS] The wall surface of the evaporation tube 8 provided within the exhaust manifold 6 is heated by the high-temperature exhaust gas immediately after it is discharged from the exhaust connection pipes 3, thereby preventing the formation of intermediates, and also conserving space. |
