【摘要】 在火花点火式电控甲醇发动机上,采用M85(85％甲醇和15％汽油的混合物)和M100(100％纯甲醇)两种甲醇燃料进行台架实验,通过气相色谱法检测和分析了甲醇和甲醛非常规污染物在发动机2 000 r／min和怠速时的排放特性,同时考察了三元催化反应器对非常规污染物的转化效率．实验结果表明:燃用甲醇燃料时,甲醇和甲醛排放量在无负荷时最大,而后,随负荷的增加而降低,到一定值后,随负荷的增加而升高,甲醇和甲醛排放量(体积分数)分别可高达450×10-6和150×10-6;催化后甲醇和甲醛的排放量均明显降低,其中甲醇的催化转化率可达到 95％以上,而甲醛的催化转化率与之相比略低．此外,怠速时发动机甲醇和甲醛的排放量也较高．更多还原

【Abstract】 The bench experiments were operated on SI HL495JIQ methanol-engine fueled M85(blending 85% methanol in methanol-gasoline fuel) and M100( methaol fuel). Methanol and formaldehyde emissions at 2 000 r/min and idle speed were detected by gas chromatograph and their catalytic convertion effiencies were also investigated. The results show that methanol and formaldehyde in engine-out emissions decrease with the increase of load at first, and then increase with the increase of the operating loads. At zero load, the concentrations of both methanol and formaldehyde are up to the masimum 450 × 10-6 and 150 × 10-6 (volume percentage) , respectively. After the catalytic treatment, methanol and formaldehyde emissions in tail pipe dramatically decrease. However, three-way catalyst is more effective in reducing methanol than in formaldehyde, and the catalytic convertion efficency of methanol is over 95%. In addition, at idle speed, there is more methanol and formaldehyde in tail pipe.更多还原