선박용 디젤기관에 있어서 Scrubber를 이용한 EGR의 연소 특성에 관한 연구

A Study on Combustion Characterisitics of EGR using Scrubber for a Marine Diesel Engine

The effects of exhaust gas recirculation(EGR) on the characteristics of combustion, and SFC is experimentally investigated by four-cylinder, four-cycle and direct injection marine diesel engine. In order to reduce the soot contents in the recirculated exhaust gas to intake system of the engines, a soot removal system with a cylindrical-type scrubber which has water injector (it has 4 nozzles in 1.0 mm diameter) is specially designed and manufactured for the experimental system. The investigated results as follows. (1) The range of fluctuation in SFC is under 2.5% and larger at high load - high EGR rate than low load - low EGR rate. (2) The combustion pressure in cylinder is decreased with increasing EGR rate and decreasing rate is larger with increasing load. (3) Ignition is delayed with increasing EGR rate and it's term is longer with increasing load. (4) The accumulated quantity of heat release is slightly decreased with increasing EGR rate and the tendency of maximum rate of heat release is not constant.