EXHAUST GAS TREATMENT DEVICE FOR MARINE DIESEL ENGINE USING FUEL OF LOWER QUALITY THAN HEAVY OIL

摘要

To provide an exhaust gas purifying equipment for a marine diesel engine which can achieve size reduction of a cyclone, and a high-PM collection efficiency and a low fuel consumption. The exhaust gas purifying equipment for a marine diesel engine includes a discharging electrode for charging particulate matter contained in exhaust gas of a marine diesel engine and a tubular collecting part for collecting charged particulate matter, and further includes a precipitation means for separating and collecting particulate matter detached from the tubular collecting part, characterized in that a PM low-concentration exhaust gas delivery pipe and a PM high-concentration exhaust gas delivery portion are provided on a downstream side of the tubular collecting part thereof, a recirculation pipe for recirculating purified gas is provided from the precipitation means for collecting particulate matter provided on the PM high-concentration exhaust gas delivery portion to between the marine diesel engine and the tubular collecting part, and a kinetic energy imparting means to exhaust gas recirculating in the recirculation pipe is further arranged so that an exhaust gas inflow velocity into the precipitation means is controlled by controlling an opening degree of a damper arranged in the PM low-concentration exhaust gas delivery pipe and/or the kinetic energy imparting means to the exhaust gas.