Characteristics of NOx, N{sub}2O & PM formation and decomposition on low quality heavy fuel oil for the vessel

摘要

The regulation of exhaust emission from vessel was started in Jan. 1st, 2000. The maximum allowable NOx emission limits for marine diesel engine were expressed clearly in terms of the original module for Main & Aux. Diesel Engine. But the proposal of SOx its own is now in the situation being delayed on account of manifold problems. In general, the low quality heavy fuel oil used mainly in ships contains high sulfur content. And then it affects not only the fuel oil cost, low temperature corrosion and engine tribology, but also the formation and emission producing the sulfuric mist in particulate matters (PM) and the dinitrogen oxides (N{sub}2O). This paper studies the combustion characteristics and emissions on the low quality heavy fuel oils. In the experiments, an industrial-scale flame was set up for analyzing it spatially in each flame location. The work indicates that the products at the flame downstream consist of NOx 270ppm, N{sub}2O 8ppm, DS and SOF respectively 1.7, 0.5g/mN{sup}3, sulfuric acid conversion amount 60 ～ 80mg/mN{sup}3 and SO{sub}2 1000 ～ 1400ppm which shown comparatively high concentrations. It is deduced that N{sub}2O formation is influentially affected by Fuel·N. The results suggest that DS is dependent upon the particulate matters of gas-phase eduction and the various Fuel metals, and SOF is the Pre-Soot and unburned droplets from the growing THC.