| 摘要 |
To eliminate a need for a reheating burner to heat an exhaust gas, and to eliminate a need for an evaporation tube which causes a loss of a flow path pressure. [MEANS] An exhaust gas emission purification device 1, provided with an exhaust chamber 5 which collects an exhaust gas emitted from an exhaust port 4a of the engine 4 and a catalytic reactor 8 having a plurality of catalyst tubes 7 with a denitration catalyst disposed therein for breaking down NOx in the exhaust gas by bringing the exhaust gas into contact with the denitration catalyst, which are serially arranged within an exhaust manifold of an engine 4 equipped with a turbocharger 2. There is also provided a nozzle 6 which is capable of spraying an aqueous solution containing a reducing agent and a reducing agent precursor, or either one of these, into the exhaust gas before it reaches the catalytic reactor 8. [ADVANTAGEOUS EFFECTS] There is no need for a reheating burner, because the exhaust gas containing the gasified reducing agent is brought into contact with the denitration catalyst while still in a high-temperature state. There is also no need for an evaporation tube, because the reducing agent precursor or the like is mixed with the high-temperature exhaust gas in the exhaust chamber and is gasified or hydrolyzed within a short time. |
