【摘要】 在柴油发动机台架上,通过HT350动态测功机、AM4000等仪器测量了柴油机氧化催化转换器(DOC)前后2个固定转速5个工况点的排放特性,分析了DOC对HC,CO,NOx,PM等影响,并用DRI碳分析仪分析了PM的碳质组分.结果表明,DOC能大幅降低HC,CO的排放,DOC前后NOx总量变化不大;DOC对颗粒物数量浓度降幅为25%～40%,其中核膜态降幅为16%～36%;随负荷增加DOC对颗粒物总数量浓度、核模态数量浓度降幅逐渐减小,积聚模态降幅逐渐增加;DOC通过降低HC促进SOF氧化从而达到催化氧化有机碳OC,OC对占PM总降幅贡献率在67%以上,EC最高仅为9%.更多还原

【Abstract】 This work investigates the effects of diesel oxidation catalyst(DOC) on emissions of HC,CO,NOx on a diesel bench under the conditions of two steady speeds with various load and five operating modes.In addition,the carbon composition of PM is analyzed by DRI thermal/optical carbon analyzer.It was found that DOC could significantly decrease the emissions of HC、CO,but had no conspicuous effect on NOx emission.DOC was effective in reducing PM concentration by 25%~40% and the reduction efficiency of nuclear mode was 16%~36%.With the continuous increment of load,the number transformation efficiency of total particle as well as nuclear mode decreases gradually,while number transformation efficiency of accumulation mode increases gradually.Further,DOC is effective in reducing organic carbon(OC) emissions through the reduction of HC,the decrement of OC contributes above 67% to the total PM decrement,while EC contributes only lower 9%.更多还原