摘要
为了研究加氢生物柴油-乙醇-柴油三元燃料的低温性能,基于热力学相平衡模型,计算了该三元燃料的析晶点和析晶量,同时对比了加氢生物柴油-柴油二元燃料的析晶点和析晶量,探究了乙醇对该二元燃料低温性能的影响。试验结果表明,相比加氢生物柴油-柴油二元燃料,加氢生物柴油-乙醇-柴油三元燃料的析晶点均有不同程度的降低,三元燃料PHC5E5、PHC10E10、PHC15E15、PHS5E5、PHS10E10和PHS15E15的析晶点分别降低了4.5、5.7、6.1、4.3、5.3、6.1 K,所对应三元燃料在不同温度下析晶量也有不同程度的降低。在初始析晶温度下,三元燃料中的乙醇与生物柴油同时开始析晶,这说明乙醇以共晶方式与高熔点组分同时析出,改变了高熔点组分在晶核形成、生长过程中的结晶趋向和结晶形态,延滞了三元燃料在低温过程中的析晶趋势;未结晶的乙醇大量分布在燃料液相以及网状和片状晶体间隙之中,一定程度上提高了已结晶组分在基液中的溶解度。这两者共同改善了加氢生物柴油-乙醇-柴油三元燃料的低温性能。该研究为优化加氢生物柴油的低温性能提供了一种有效可靠的方法。
Thermodynamic phase equilibrium model was adopted to study the low temperature performance of hydrogenated biodiesel-ethanol-diesel ternary blend,and the crystallization point and crystallization quantity were calculated.Furthermore,the effect of ethanol on the low temperature performance of hydrogenated biodiesel-diesel binary blend was also investigated by comparing the crystallization points and crystallization quantities of ternary blend and binary blend.It was revealed that compared with hydrogenated biodiesel-diesel binary blends,the crystallization points of hydrogenated biodiesel-ethanol-diesel ternary blends were reduced to varying degrees.To be specific,the crystallization points of PHC5E5,PHC10E10,PHC15E15,PHS5E5,PHS10E10 and PHS15E15 were reduced by 4.5,5.7,6.1,4.3,5.3 and 6.1 K,respectively,compared with the corresponding binary blends.Various decreases of crystallization quantities for ternary blends at different temperatures were also observed in contrast with binary blends.Ethanol and biodiesel in ternary fuel blends started to crystallize simultaneously at the initial crystallization temperature,which implies that ethanol simultaneously precipitates with the high-melting components in eutectic mode to change the crystallization tendency and crystal morphology of the components with high melting points during nucleation and growth.In addition,most of non-crystallized ethanol is distributed in the liquid phase of the fuel as well as in the interstices of the network and plate crystals,which improves the solubility of the crystallized component in the base liquid to a certain extent,Both of them boost the low temperature performance of hydrogenated biodiesel-ethanol-diesel ternary blends.This study provides an effective and reliable method for optimizing the low temperature performance of hydrogenated biodiesel.
作者
左磊
张起
代圣超
ADU-MENSAH Derick
梅德清
ZUO Lei;ZHANG Qi;DAI Shengchao;ADU-MENSAH Derick;MEI Deqing(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2019年第11期56-62,70,共8页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51761145011,51876082)
关键词
加氢生物柴油
乙醇
三元燃料
热力学相平衡
低温性能
hydrogenated biodiesel
ethanol
ternary fuel blend
thermodynamic phase equilibrium
low temperature performance
作者简介
左磊(1994—),男,硕士生;通信作者:梅德清,男,副教授。
