| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact and inexpensive exhaust emission control device.SOLUTION: The exhaust emission control device 1 includes: a DPF (diesel particulate filter) 3 provided in an exhaust pipe 2 through which exhaust gas from a diesel engine flows; an oxidation catalyst 4 provided in the exhaust pipe 2 upstream of the DPF 3; and a gas oil injection device 5 connected to the exhaust pipe 2 upstream of the oxidation catalyst 4. The DPF 3 includes a porous DPF carrier 8 allowing exhaust gas to pass through; a urea decomposition catalyst 10 carried on an exhaust gas inlet side wall 9 of the DPF carrier 8; and a urea SCR catalyst 11 carried on the exhaust gas outlet side wall 9 of the DPF carrier 8. A urea injection device 6 injecting urea into exhaust gas is connected to the exhaust pipe 2 downstream of the oxidation catalyst 4 and upstream of the DPF 3. |
