【摘要】 为研究船舶中速柴油机应用柴油氧化催化器（DOC）技术的可行性，试验了船舶柴油机典型低温大流量工况下DOC对选择性催化还原器（SCR）催化性能及共同作用下颗粒物（PM）理化性质的影响．结果表明：在典型的低温大流量工况下DOC的应用会提升SCR系统的催化效率，在柴油机高负荷排气工况(空速为18 000 h^-1)下催化效率提升了65%;DOC和SCR共同作用会降低PM的石墨化程度，且排气温度越高，石墨化程度越低；共同作用会增加PM表面含氧官能团的浓度，其中C—OH官能团含量增加了100%,PM的氧化活性大幅提升；在碳氢官能团中，作为PM生长核心的脂肪族C—H官能团浓度大幅降低，降低幅度达到了50%，减少了PM的继续生长和聚集的机率．更多还原

【Abstract】 To investigate the feasibility of utilizing diesel oxidation catalytic converter（DOC） technology in marine medium speed diesel engines,an experimental study was conducted to examine the effects of DOC on selective catalytic reduction（SCR） performance and physicochemical properties of particulate matter（PM） under typical low temperature and high flow conditions in marine diesel engines.The experimental results demonstrate that the utilization of DOC can enhance the catalytic efficiency of the SCR system in typical low temperature and high flow conditions,resulting in a 65%increase in catalytic efficiency under high load(18 000 h^-1) exhaust condition of the diesel engine.The addition of DOC can decrease the degree of graphitization in PM,and this effect is more pronounced at higher exhaust temperatures.The application of DOC can also enhance the concentration of oxygencontaining functional groups on the surface of PM,particularly leading to a 100%increase in the concentration of CDOH functional group.Consequently,this significantly enhances the oxidation activity of PM.In hydrogencontaining functional groups,the concentration of aliphatic CDH functional group,which serves as the growth nucleus of PM,is significantly reduced by 50%,thereby impeding the continued growth and aggregation of PM.更多还原