EXHAUST GAS AFTER-TREATMENT APPARATUS HAVING IMPROVED DURABILITY AND EXHAUST GAS AFTER-TREATMENT METHOD

摘要

The present disclosure relates to an exhaust gas after-treatment apparatus having improved durability, which includes: an exhaust gas oxidation catalyst part which oxidizes exhaust gas; an exhaust gas filtering part which is connected to the exhaust gas oxidation catalyst part, and filters the exhaust gas; a selective catalyst reducing part which is connected to the exhaust gas filtering part; and an ammonia oxidation catalyst part which is connected to the selective catalyst reducing part, in which a first gas detection sensor for detecting a generated amount of nitrogen compound in the exhaust gas flowing from the exhaust gas filtering part, and a selective catalyst reducing bypass valve for selectively blocking the exhaust gas from flowing into the selective catalyst reducing part are installed at a front side of the selective catalyst reducing part, and the exhaust gas after-treatment apparatus includes a control part which is electrically connected so as to control whether to operate the selective catalyst reducing bypass valve and the selective catalyst reducing part on the basis of a gas amount detection signal.