| 摘要 |
PURPOSE: An exhaust gas processing device and a control method thereof are provided to regulate a sprayed amount of a reducing agent, thereby minimizing the amount of ammonia ejected to atmosphere. CONSTITUTION: An exhaust gas processing device comprises an exhaust line(100), an oxidation catalyst(110), a smoke filter(140), a reducing agent spraying device(120), a differential pressure sensor(150), a control unit, and a temperature sensor(130). A method of controlling the exhaust gas processing device comprises: a step of calculating proportions of nitrogen oxide and nitrogen monoxide included in exhaust gas by using a mass flow of the exhaust gas and the temperature sensed by the temperature sensor; a step of calculating the amount of particulate matters collected by the differential pressure of the front and rear ends of the smoke filter and an operation condition of an engine; a step of calculating a reduced amount of the nitrogen oxide included in the exhaust gas according to the amount of particulate matters; and a step of regulating a sprayed amount of a reducing agent proportional to a reduced amount of nitrogen dioxide and the amount of the nitrogen oxide. |
