Exhaust gas treatment device for marine diesel engine that uses low-quality fuel containing high concentration of sulfur component

Abstract

Provided is an exhaust gas treatment device that is for a marine diesel engine and that achieves a high pm collection efficiency and onboard incineration of pm. The exhaust gas treatment device is characterized by comprising: a discharge electrode that charges the particulate matter that is included in exhaust gas from an engine; a tubular collection unit that constitutes a dust-collecting electrode that collects the charged particulate matter; a low-concentration exhaust gas outlet pipe; a high-concentration exhaust gas outlet pipe; a pm-free scrubber that is provided to the low-concentration exhaust gas outlet pipe; and a dust collection means that separates and collects particulate matter that is peeled from the tubular dust collection unit at a dust collection cyclone. The invention is further characterized by comprising: an incineration device that incinerates the pm that is collected by the dust collection means; and recirculation piping that recirculates combustion exhaust gas that is generated by the incineration device to the collection unit or to an exhaust pipe that is upstream from the collection unit.