| 摘要 |
PURPOSE: A large two-stroke cycle diesel engine with an exhaust gas purification system is provided to operate with an SCR(Selective Catalytic Reduction) reactor while maintaining sufficient scavenge pressure. CONSTITUTION: A large two-stroke cycle diesel engine with an exhaust gas purification system comprises a cylinder, a catalyst reductive reactor(8), an exhaust duct(10), a compressor(14), a sub blower fan(20), a scavenger gas receiving unit(22), a bypass line(26), and an electronic control unit(33). The cylinders are connected to an exhaust gas receiving unit(6). The catalyst reductive reactor comprises an inlet part connected to the outlet part of the exhaust gas receiving unit. The exhaust duct connects the outlet part of the selective catalytic reduction reactor to a turbine(12) of a turbocharger. The compressor delivers scavenger gas to the scavenger gas receiving unit through a scavenger gas channel(16) including a scavenger gas cooler(18). The sub blower fan supports the compressor in a low-load condition. The scavenger gas receiving unit is connected to the cylinders. The electronic control unit allows the flow of scavenger gas into the exhaust duct through the bypass line when an engine load or the temperature of exhaust gas flowing in an SCR reactor is lower than a threshold. |
