| 摘要 |
A large turbocharged two-stroke compression ignited internal combustion engine (1) of the crosshead type with a turbocharger with an exhaust gas driven turbine (12)connected to a compressor (14), a plurality of cylinders connected to a scavenge air receiver (22) and to an exhaust gas receiver (6), a SCR reactor (8) with an inlet connected to an outlet of the exhaust gas receiver (6), an exhaust conduit (10) connecting an outlet of the SCR reactor (8) to an inlet of the turbine (12), a scavenge air conduit (16) connecting an outlet of the compressor (14) to an inlet of the scavenge air receiver (22) via a scavenge air cooler (18), an auxiliary blower (20) in the scavenge air conduit (16) for assisting the compressor (14) at low load conditions of the engine (1), a controllable by pass conduit (26) extending from a position in the scavenge air conduit (16) to a position in the exhaust conduit (10), the controllable bypass conduit (26) comprising a first electronic control valve (28) controlled by an electronic control unit (33), the scavenge air conduit (16) comprising a second electronic control valve (48) controlled by the electronic control unit (33), the second electronic control valve (48) being arranged downstream of the position where the controllable bypass conduit (26) connects to the scavenge air conduit (16), and the electronic control unit (33)being configured to control the flow of scavenge air from the scavenge air conduit (16) through the controllable by-pass conduit (26) to the exhaust conduit (10) by controlling the position of the first and second electronic control valve (28,48). |
