共查询到19条相似文献,搜索用时 82 毫秒
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根据0#柴油、乙醇、花生油互溶性三相图,配制0#柴油、乙醇和花生油体积比为25:4:5的混合燃料。燃用混合燃料的柴油机台架实验表明:燃用0#柴油-乙醇-花生油混合燃料的柴油机应该适当增大柴油机供油提前角。柴油机供油提前角为16.8°时,在小负荷工况下,燃用0#柴油-乙醇-花生油混合燃料的柴油机油耗率明显大于燃用0#柴油的柴油机油耗率,最高达到19.55%;在中高负荷工况下,略低于燃用0#柴油的柴油机油耗率。因此燃用0#柴油-乙醇-花生油混合燃料的柴油机在增大柴油机供油提前角的前提下,在中高负荷工况时的经济性和动力性好于0#柴油。 相似文献
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考察了乙醇柴油的基本性能,经研究发现,柴油中加入一定量的乙醇后,存在互溶性变差、燃烧性变差、腐蚀性增加、润滑性变差等问题,因此建议采用添加剂技术改善其性能以满足发动机的使用要求。 相似文献
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生物柴油特性及作为混合燃料添加剂的研究 总被引:2,自引:0,他引:2
本文论述了生物柴油优越的理化特性可作为柴油的替代燃料,并讨论了生物柴油作为乙醇(甲醇)与柴油或汽油混合燃料的添加剂情况,通过溶解度测定及三相图实验数据表明:生物柴油作为乙醇与柴油添加剂,促溶效果较好:对于生物柴油-汽油-乙醇体系来讲,三者可以任意比例混合,可改善汽油的燃烧性能:对于生物柴油-柴油-甲醇体系,效果不理想。 相似文献
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根据乙醇与柴油的理化性质论述了乙醇作为柴油代用燃料的特点,介绍了乙醇在柴油机中的燃烧方式和节能、环保机理,综述了国内外乙醇柴油燃料的研究进展,最后总结了应用乙醇柴油燃料的意义。 相似文献
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生物柴油是石化柴油的可靠替代品,燃料性能指标对生物柴油至关重要。本文对我国的GB/T20828、欧盟的EN14214和美国的ASTMD6751三个生物柴油标准中的燃料性能指标进行了比较和探讨,对其中一些比较重要的测定方法作了简要介绍,并对生物柴油质量标准的未来作了展望。 相似文献
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F. Frusteri C. Cannilla G. Bonura L. Spadaro A. Mezzapica C. Beatrice G. Di Blasio C. Guido 《Topics in Catalysis》2013,56(1-8):378-383
Spherical silica supported Hyflon® catalysts (SSHC) were developed to produce ethers from glycerol by etherification reaction with isobutene. SSHC allowed to obtain yields to di- and tri-ethers, suitable as additives or components for diesel fuels, higher than that obtained with A-15 commercial catalyst, and a concentration of undesired mono-ether (not soluble in diesel) lower than 3 wt%. The novel catalysts investigated were found stable and easily reusable; their low acid site density prevented the occurrence of oligomerization reaction accounting for di-isobutene formation. Engine tests performed using a blend containing 10 vol% of glycerol ethers mixture confirmed the positive role of additives in reducing emissions of particulates and unburned hydrocarbons with significant improvement of diesel combustion efficiency. 相似文献
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A. A. Buzukov 《Combustion, Explosion, and Shock Waves》2002,38(3):301-310
Results of experiments performed in a constant-volume bomb are presented. The conditions in the bomb were typical of starting regimes of diesel engines. Cooled (down to 286 K) or noncooled inserts were placed in the bomb volume on the way of the fuel–air jet. These inserts were plates simulating a sector of the combustor wall. Leaf deflectors of the jet were mounted on the plates to obtain the effect of secondary mixing. In the case of an elevated pressure in the medium (2.5 MPa and higher), the presence of the inserts, including those equipped by deflectors, independent of their thermal state, affects ignition only at extremely low temperatures of the medium, at which the primary ignition of fuel vapors and products of its thermal decomposition occurs in an immediate vicinity of the insert. If the initial pressure in the medium is rather low (0.9 MPa), the influence of the insert is significant: a noncooled surface reduces both the induction period (by a factor of 1.5 as compared to injection into a free volume) and the limiting temperature of ignition. If the insert surface is cooled, however, the ignition delay increases by 20%, and the limiting temperature of ignition increases by 100 K. Under these conditions, a leaf deflector of the jet mounted on the wall-simulator surface significantly improves the ignition characteristics of the mixture: the ignition delay and the limiting temperature decrease down to values that do not exceed those upon injection into a free volume. It is assumed that the secondary injection of the mixture from the edge of the leaf deflector into the free space of the working volume leads to the formation of a closed circular vortex containing both the liquid phase (atomized fuel drops) and the gaseous phase (fuel vapors, products of its partial thermal decomposition, and air). Key words: diesel engine, mixing. 相似文献
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Silicon - Biodiesel has been renowned as potential and alternative fuel for years. In order to improve the quality of the conventional fossil fuels, biodiesel, and air pollution from combustion,... 相似文献
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以高速分散器为乳化设备,0#柴油和无水乙醇为主要原料制备了乙醇乳化柴油乳液。考察了乳化剂的类型、HLB值和用量等对乳液稳定性的影响。实验结果表明,以油酸和壬基酚聚氧乙烯醚复配为乳化剂、HLB值为8、乙醇含量小于15%,调整内、外相密度近似相等可提高乳液稳定性,提出密度可以作为配制乙醇乳化柴油的参考依据。 相似文献
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介绍了4G15S汽油机台架上进行M15甲醇汽油的应用试验,并对试验结果进行了分析。试验结果表明该汽油机燃用M15甲醇汽油与燃用93#汽油相比,低转速时,动力性略有下降,燃油消耗率略有增加;高转速时,动力性略有增加,燃油消耗率略有下降;尾气排放中HC与CO有明显降低。 相似文献