船用发动机有害排放气体的评价及处理研究——燃料性质和输出轴扭...

为了评价船有发动机有害气体的排放，本从燃料的性质着手，较为详细地对不同性质的１３种燃烧进行了研究，并在一台中型四冲程船用柴油机上进行了试验，测定了各种有害排气的浓度、发动机的性能和燃烧特性，对燃料的性质与排放之间的相关性进行了探讨。进一步调查研究了柴油机运转工况的不同及输出轴扭矩的变化对ＮＯｘ排放的影响。由试验结果可知：对于周期性输出扭矩的变化，ＮＯｘ的排放也发生周期性的变化。但是，柴油机在高输

Study on Assessment andTreatment for Harmful ExhaustEmissions from Marine Diesel Engines

This paperdescribes our study on evaluation of harmful exhaust gases from marine diesel engines.Atfirst,13 kinds of fuel were collected and their properties were measured.A medium-speedmarine diesel engine was operated with the above fuels,and exhaust gasconcentration,engine performance,and combustion property were measured at some partialloads.Thus,the correlation of these outputs with the fuel properties wasinvestigated.Moreover,the emission characteristics of NO_x with the variation ofengine operating condition and the fluctuation of shaft torque were studied.The resultsare summarized as followsNO_x concentration varies with the periodicalfluctuation of shaft torque,the adjusted value of NO_x concentration decreaseswith an increase in shaft torque at higher engine loads while it increases at lower engineloads,and,NO_x concentration in periodical fluctuation of shaft torque can beregarded as equal to that in corresponding constant engine load.