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首页> 外文期刊>Fuel >Direct measurement of formaldehyde and methanol emissions from gasohol engine via pulsed discharge helium ionization detector
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Direct measurement of formaldehyde and methanol emissions from gasohol engine via pulsed discharge helium ionization detector

机译：通过脉冲放电氦电离检测器直接测量汽油机中甲醛和甲醇的排放量

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摘要

Unregulated formaldehyde (HCHO), acetaldehyde (CH_3CHO) and methanol (CH_3OH) emissions from M10 blend (methanol/gasoline = 1/9 in volume) fuelled spark ignition (SI) engine were directly detected by a gas chromatography (GC) with a Gs-OxyPLOT capillary column and pulsed discharge helium ionization detector (PDHID). Chromatograms show that HCHO and CH_3OH are well separated and linearly responded on PDHID within the range of 0.8-800 μg/L. The method is proved suitable and reliable for measuring unregulated pollutants from the engine. Experimental results show that compared with gasoline, HCHO emission from M10 is greatly larger while CH_3CHO is smaller. HCHO emission increases while CH_3OH emission decreases with engine speed and tailpipe temperature. The three-way catalytic converter (TWC) can remove over 85% of CH_3OH and CH_3CHO emissions when it is lightened off. However, an unfamiliar phenomenon of minus HCHO conversion efficiency happens when engine speed is over 3500 r/min, which infers that TWC may enhance HCHO emission rather than weaken it at high engine speeds.
机译：M10混合物（甲醇/汽油= 1/9体积）的汽油火花点火（SI）发动机排放的未调节甲醛（HCHO），乙醛（CH_3CHO）和甲醇（CH_3OH）的排放通过带有Gs的气相色谱仪（GC）直接检测-OxyPLOT毛细管柱和脉冲放电氦离子化检测器（PDHID）。色谱图表明，HCHO和CH_3OH分离良好，并且对PDHID的线性响应范围为0.8-800μg/ L。实践证明，该方法适用于测量发动机中未调节的污染物。实验结果表明，与汽油相比，M10的HCHO排放量较大，而CH_3CHO的排放量较小。随着发动机转速和排气管温度的升高，HCHO的排放量增加，而CH_3OH的排放量减少。三效催化转化器（TWC）熄灭后，可以清除超过85％的CH_3OH和CH_3CHO排放物。但是，当发动机转速超过3500 r / min时，会发生不熟悉的HCHO转换效率降低的现象，这表明TWC可能会提高HCHO排放，而不会在高发动机转速时减弱HCHO排放。

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