EXHAUST GAS PURIFICATION DEVICE FOR LARGE DISPLACEMENT MARINE DIESEL ENGINE USING LOW-QUALITY FUEL EQUIVALENT OR INFERIOR TO FUEL OIL

摘要

In particular, the present invention is capable of removing PM, particularly SOF and sulfate, in exhaust gas of marine diesel engines using low-grade fuel less than heavy oil with high efficiency, and also to prevent leakage of substances that adversely affect environmental pollutants or ecosystems And to provide an exhaust gas purifying apparatus for a marine diesel engine which can easily and reliably suppress the exhaust gas purifying apparatus. An exhaust gas purifying apparatus of a marine diesel engine using a low-quality fuel of a heavy oil or less according to the present invention is characterized in that an exhaust gas cooler is provided in an exhaust pipe following an exhaust manifold of an engine, An electric dust collecting means for removing PM mainly composed of SOF and ISF contained therein is provided and a scrubber for further purifying the exhaust gas is disposed downstream of the electric dust collecting means and a part of the exhaust gas is supplied to the exhaust pipe on the downstream side of the scrubber The EGR gas is refluxed to the intake air of the engine through the EGR pipe and the EGR valve connected to the branching section.