| 摘要 |
PROBLEM TO BE SOLVED: To provide a reducing agent supply device of a urea SCR (Selective Catalytic Reduction) catalyst capable of improving the catalyst function in the urea SCR catalyst, and capable of restraining consumption of urea water, without excessively increasing engine exhaust pressure.SOLUTION: This reducing agent supply device 1 is provided for supplying the urea water from its urea water injector 5 to the urea SCR catalyst 8 by hydrolyzing the urea water into ammonia, by arranging the urea water injector 5 for injecting the urea water in an exhaust pipe 2 upstream of the urea SCR catalyst 8, by arranging the urea SCR catalyst 8 in the exhaust pipe 2 of an engine 7 for reducing nitrogen oxides discharged from the engine 7 by using the ammonia as a reducing agent. A swelling part 3 diametrically expanded more than the exhaust pipe 2 for increasing static pressure of exhaust gas, is arranged in the exhaust pipe 2 upstream of the urea SCR catalyst 8, and its swelling part 3 is connected by a bypass pipe 4 to the exhaust pipe 2 between the swelling part 3 and the urea SCR catalyst 8, and the urea water injector 5 is installed in its bypass pipe 4. |
