Impact of n-butanol and hydrous ethanol fumigation on the performance and pollutant emissions of an automotive diesel engine
Impact of n-butanol and hydrous ethanol fumigation on the performance and pollutant emissions of an automotive diesel engine
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DOI：
10.1016/j.fuel.2015.03.022
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发表时间：
2015-08
期刊：
影响因子：
7.4
通讯作者：
Andrés F. López;Marlon Cadrazco;Andrés F. Agudelo;L. Corredor;Juan A. Vélez;J. Agudelo
中科院分区：
文献类型：
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作者：
Andrés F. López;Marlon Cadrazco;Andrés F. Agudelo;L. Corredor;Juan A. Vélez;J. Agudelo
研究了含水乙醇和正丁醇熏蒸对车用柴油机燃烧特性、性能、污染物排放、颗粒数浓度和粒径分布的影响。与超低硫柴油（ULSD）相比，两种醇类燃料的预混燃烧峰高、燃烧过程快、指示平均有效压力（imep）变异系数大、最高缸内温度低，且与发动机负荷无关。无论是正丁醇或含水乙醇提出更好的制动热效率（bte）和制动比燃料消耗率（bsfc）比ULSD。酒精熏蒸的发动机性能对运行模式非常敏感。因此，有必要优化特定的热条件，以实施熏蒸策略。与ULSD燃料相比，这两种醇增加了一氧化碳（CO）和总烃（THC），减少了氮氧化物（NOx）和颗粒物（PM）。然而，这种减少的幅度明显受到发动机运行模式的影响。在所有燃料中，正丁醇显示出最佳的折衷（PM与NOx + THC）。与超低硫柴油相比，含水乙醇熏蒸降低了颗粒物的总数浓度，同时保持或增加几何平均直径，这取决于发动机负荷。与超低硫柴油相比，正丁醇保持或降低了颗粒的总数浓度，而几何平均直径则呈现相反的趋势。正丁醇的颗粒数浓度和粒径分布不受发动机负荷的影响。
This work studied the impact of hydrous ethanol and n-butanol fumigation on the combustion characteristics, performance, pollutant emissions, particle number concentration and size distribution of an automotive diesel engine. Independently of engine load, both alcohols exhibited higher premixed combustion peaks, faster combustion process, and higher coefficient of variation of indicated mean effective pressure (imep) and reduced maximum in-cylinder temperature, in comparison with ultra low sulfur diesel (ULSD). Neither n-butanol nor hydrous ethanol presented better brake thermal efficiency (bte) and brake specific fuel consumption (bsfc) than ULSD. Engine performance with alcohol fumigation is highly susceptible to operating mode. Therefore, it is necessary to optimize the specific thermal conditions for implementing a fumigation strategy. Both alcohols increased carbon monoxide (CO) and total hydrocarbons (THC) and reduced nitrogen oxides (NOx) and particulate matter (PM), in comparison with ULSD fuel. However, the magnitude of this reduction was markedly affected by engine operating mode. The n-butanol showed the best trade-off (PM vs NOx + THC) among all fuels. In comparison with ULSD, hydrous ethanol fumigation decreased the total number concentration of particles while maintaining or increasing the geometric mean diameter, depending on the engine load. In comparison with ULSD, n-butanol maintained or reduced the total number concentration of particles and exhibited the opposite trend for the geometric mean diameter. The particle number concentration (PNC) and size distribution were not affected by engine load for n-butanol.