After treatment device of engine

摘要

Disclosed is an after treatment device of an engine, which comprises: an urea solution injection section for injecting an urea solution to exhaust gas that is discharged from a combustion chamber of an engine to the outside via an exhaust pipe; a nitrogen oxide treatment section for converting a nitrogen oxide (NOx) in the exhaust gas, which is mixed with the urea solution injected from the urea solution injection section, into water (H2O) and nitrogen (N2); and an OC (Oxidation Catalyst) for reducing hydrocarbon (HC) and carbon monoxide (CO) in the exhaust gas that is discharged from the nitrogen oxide treatment section. The device is characterized by comprising an exhaust gas control unit, which supplies the exhaust gas that is discharged from the combustion chamber of the engine to the outside to a first treatment path and a second treatment path by distributing the same at a uniform rate according to the concentration level of the nitrogen oxide (NOx) in the exhaust gas that is discharged from the combustion chamber of the engine to the outside. The present disclosure is able to secure the efficiency and the durability of an SCR which converts harmful nitrogen oxide (NOx) into harmless water (H2O) and nitrogen (N2).

主权项

1. An after treatment device of an engine, which includes a urea solution injection section configured to inject a urea solution to exhaust gas, which is discharged from a combustion chamber of the engine to the outside through an exhaust pipe, a nitrogen oxide treatment section 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, into harmless water (H2O) and nitrogen (N2), and an OC (oxidation catalyst) configured to reduce hydrocarbon (HC) and carbon monoxide (CO) in the exhaust gas which is discharged from the nitrogen oxide treatment section, the after treatment device comprising:
a discharge gas control unit configured to distribute and supply the exhaust gas, which is discharged from the combustion chamber of the engine to the outside, to a first treatment path and a second treatment path 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 to the outside.