Exhaust gas purification device

摘要

An exhaust gas purification device comprising a selective reduction catalyst which can cause the reaction between NOx contained in an exhaust gas (2) with ammonia, an exhaust gas flow path (5) through which the exhaust gas (2) is introduced to the selective reduction catalyst, and an aqueous urea addition unit (4) (an aqueous urea addition means) which is arranged in the middle of the exhaust gas flow path (5) and by which an aqueous urea (3) is added to the exhaust gas (2), wherein a part of the exhaust gas flow path (5) which is adjacent to an aqueous urea (3) addition part in the exhaust gas flow path (5) comprises a divided piece (5a) composed of a material having higher corrosion resistance to a substance produced as a result of the addition of the aqueous urea (3) compared to the corrosion resistance of a material constituting the remaining part (i.e., a part other than the adjacent part) of the exhaust gas flow path (5).