Experimental study on diesel conventional and low temperature combustion by fueling four isomers of butanol
Experimental study on diesel conventional and low temperature combustion by fueling four isomers of butanol
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丁醇四种异构体柴油常规低温燃烧实验研究
DOI：
10.1016/j.fuel.2014.10.053
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发表时间：
2015-02
期刊：
影响因子：
7.4
通讯作者：
Mingfa Yao
中科院分区：
文献类型：
--
作者：
Haifeng Liu;Yan Zhang;Xiaofan Zhong;Mingfa Yao
在单缸柴油机上研究了丁醇对常规燃烧和低温燃烧的影响。将正丁醇、仲丁醇、异丁醇和叔丁醇四种丁醇异构体按体积比20%和40%分别加入柴油中，分别称为N20/N40、S20/S40、I20/I40和T20/T40。实验在EGR从0%到~ 65%的宽范围内进行。结果表明，与纯柴油相比，丁醇/柴油混合燃料的燃烧相位延迟，预混热释放量增大。随着EGR率和混合比的增加，不同丁醇/柴油混合物的气缸压力和热释放率的差异越来越大。点火延迟从长到短依次为异丁醇/柴油、仲丁醇/柴油、正丁醇/柴油和叔丁醇/柴油。在一定的EGR范围内，丁醇/柴油混合物比柴油具有更高的热效率。丁醇异构体的加入能显著降低烟尘排放，掺合比例越高，减灰效果越好。烟尘排放从高到低依次为叔丁醇/柴油、正丁醇/柴油、中丁醇/柴油、二丁醇/柴油，这与人们普遍认为的烟尘排放越低，点火延迟时间越长这一观点是一致的。不同丁醇/柴油混合燃料的烟尘排放差异主要由燃料的十六烷值决定，同时挥发性等物理性质也会对烟尘排放产生一定影响。添加丁醇异构体对调节气体排放没有显著影响。
Effects of butanol on conventional and low temperature combustion were investigated on a single-cylinder diesel engine. Four butanol isomers,n-butanol,sec-butanol,iso-butanol andtert-butanol were added into diesel by volume ratios of 20% and 40%, referred to as N20/N40, S20/S40, I20/I40 and T20/T40, respectively. Experiments were conducted over a wide range of EGR from 0% to ∼65%. Results indicate that butanol/diesel blends show the retarded combustion phasing and higher premixed heat release compared with pure diesel. Differences in cylinder pressures and heat release rates among different butanol/diesel blends get larger as EGR rate and blending ratio increases. Ignition delays from the longest to shortest are in the sequence ofiso-butanol/diesel,sec-butanol/diesel,n-butanol/diesel andtert-butanol/diesel. Butanol/diesel blends exhibit higher thermal efficiencies compared with diesel in a certain EGR region. The addition of butanol isomers can significantly reduce soot emission and a higher blending ratio results in greater soot reduction. And the soot emissions, from the highest to lowest, are in the order oftert-butanol/diesel,n-butanol/diesel,sec-butanol/diesel, andiso-butanol/diesel, which is consistent with the commonly recognized view that a lower soot emission accompanies with a longer ignition delay. The difference in soot emission among different butanol/diesel blends is predominantly determined by fuel’s cetane number, meanwhile physical properties such as volatility can also influence soot emissions to some extent. Regulated gaseous emissions are not significantly affected by addition of butanol isomers.
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