| 摘要 |
PURPOSE:To eliminate seasonal variation of NOx concentration in exhaust gas and improve denitration performance by providing a humidifier at an intake pipe system while providing a reducer which reduces NOx with catalyst and ammonia at an exhaust pipe system, and controlling them with a controller. CONSTITUTION:A diesel engine 1 is provided with a supercharger 5 formed of a compressor 5a connected to an inlet of an intake pipe 2, a turbine 5b is interconnected to the compressor 5a connected to an outlet of an exhaust pipe 3. A humidifier 7 is provided to supply steam and the like to an intake pipe 2 of the upstream side of an air cooler 6 to humidify intake air based on absolute humidity and the like of atmosphere. This humidifier 7 is constituted of a built-in controller which controls a flow quantity control valve 7a. To an exhaust pipe 3, a bomb 8 which supplies ammonia gas is connected via a flow quantity control valve 8a controlled by the controller 9. To the exhaust pipe 3, at the upstream side of the supercharger 5, a reducer 10 which reduces NOx in the exhaust gas containing ammonia by catalyst and a bypass pipe 3a are parallely connected. |
