| 摘要 |
PROBLEM TO BE SOLVED: To prevent damage from being caused at a compressor of a supercharger in an exhaust gas recirculation system for marine diesel engine having a scrubber at a recirculation passage with a simple and inexpensive means.SOLUTION: There are provided: a supercharger 16 in which an exhaust turbine 18 arranged at an exhaust passage 14 and a compressor 20 arranged at air-supply passage 34 are cooperated through a rotating shaft 22; an exhaust recirculation passage 24 branched from the exhaust passage 14 so as to cause exhaust gas (e) to be recirculated to a marine diesel engine 12; and a scrubber 30 arranged at the exhaust recirculation passage 24 to atomize washing water and clean the exhaust gas. An impeller 38 constituting the compressor 20 is made such that a surface of the impeller 38 including at least a front edge region of an impeller blade 40 is formed with a plating film made of Ni-based alloy with a film thickness of 15 μm or more and 60 μm or less. |
