| 摘要 |
The present invention discloses an after treatment device of an engine. The after treatment device of the engine includes a urea solution injection section 3 configured to inject a urea solution to exhaust gas, which is discharged from a combustion chamber of an engine 1 to the outside through an exhaust pipe 2, a nitrogen oxide treatment section 4 configured to convert nitrogen oxide (NOx) in the exhaust gas, which is mixed with the urea solution which is injected from the urea solution injection section 3, into harmless water (H2O) and nitrogen (N2), and an OC (oxidation catalyst) 5 configured to reduce hydrocarbon (HC) and carbon monoxide (CO) in the exhaust gas which is discharged from the nitrogen oxide treatment section 4, the after treatment device including: a discharge gas control unit 20 configured to distribute and supply the exhaust gas, which is discharged from the combustion chamber of the engine 1 to the outside, to a first treatment path 15 and a second treatment path 16 at a uniform ratio in accordance with a concentration level of the nitrogen oxide (NOx) in the exhaust gas which is discharged from the combustion chamber of the engine 1 to the outside. The present invention is able to secure efficiency and durability of an SCR which converts harmful nitrogen oxide (NOx) into harmless water (H2O) and nitrogen (N2).
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