摘要
为明晰含氧生物燃料加氢生物柴油(HB)和乙醇(E)增强燃烧反应活性的作用机理,依据燃料属性协同互补原则,构建包含162个组分、605步反应的加氢生物柴油-乙醇-柴油混合燃料氧化反应动力学模型,在压力为6 MPa、燃料与空气当量比为1的条件下开展混合燃料燃烧模拟,探究在柴油中掺混不同体积比的加氢生物柴油和乙醇(HB10、HB20、HB5E5、HB10E10、HB15E15)及不同温度(900和1400 K)下混合燃料的化学反应路径及活性物质生成规律。研究表明:分析二元燃料HB10和HB20燃烧反应路径可知,加氢生物柴油向正庚烷裂解反应提供OH,这与加氢生物柴油高十六烷值相契合,表明使用油酸甲酯-硬脂酸甲酯混合物作为实际燃料加氢生物柴油的模型化合物较为合理。在低温900 K下,随着三元燃料体系中加氢生物柴油-乙醇含量增多,OH生成量逐渐减少,此时反应体系活性逐渐降低,削弱了反应强度;而在高温1400 K下,随着加氢生物柴油-乙醇含量增多,体系中形成的OH逐渐增多,反应活性逐渐增强,表明在高温下增加加氢生物柴油-乙醇的含量有利于反应进行。分析高低温混合燃料燃烧反应流可见,长链酯类和烃类(柴油)及短链醇类燃烧氧化的末端反应均集中指向CH_(2)O→HCO→CO这一重要的反应路径。
To clarify the mechanism of oxygenated biofuels like hydrogenated biodiesel(HB)and ethanol(E)in enhancing combustion reactivities,an oxidation kinetic model of the hydrogenated biodiesel-ethanol-diesel blended fuels was constructed based on the synergy and complementarity of fuel properties.The model encompasses 162 components and 605 elementary reactions.The combustion process of fuel blends was simulated under the conditions of 6 MPa and fule-air equivalent ratio of 1,aiming to explore the chemical reaction pathways and the formation mechanisms of active substances for diesel blends with varing HB/ethanol volume ratios(HB10,HB20,HB5E5,HB10E10,and HB1E15)at different temperatures(900 and 1400 K).Research reveals that by analyzing the combustion reaction pathways of binary fuel HB10 and HB20,it can be found that HB provides OH to facilitate the n-heptane cracking reaction,which is in conformance with the fact that HB owns high cetane number.This finding has demonstrated that it is reasonable to use the mixtures of methyl oleate and methyl stearate as the model compounds for HB.At the low temperature of 900 K,the increase of HB-E fractions in the ternary fuel system leads to a gradual reduction in OH radical generation,while the reactivity of the system is gradually decreased,and thus the reaction strength is weakened;at the high temperature of 1400 K,the increase of HB-E fractions results in a gradual increase in OH radical genertion,and thus the reactivity is enhanced,which implies that increasing the HB-E fractions at high temperatures may be conducive to the combustion reactions.By analyzing the combustion reaction flow of various fuel blends at high and low temperatures,it is found that the terminal combustion oxidation of long-chain esters,hydrocarbons(diesel)and short-chain alcohols are predominantly directed towards a critical pathway,i.e.,CH_(2)O→HCO→CO.
作者
张煜奇
梅德清
蔡茂春
赵卫东
章传方
胡千杰
ZHANG Yuqi;MEI Deqing;CAI Maochun;ZHAO Weidong;ZHANG Chuanfang;HU Qianjie(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China;Yancheng Yanhai Tractor Manufacturing Co.,Ltd.,Yancheng 224001,China)
出处
《石油学报(石油加工)》
北大核心
2025年第5期1340-1347,共8页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
江苏省国际合作项目(BZ2022016)基金资助。
关键词
加氢生物柴油
油酸甲酯
三元燃料
燃烧机理
反应路径
hydrogenated biodiesel
methyl oleate
ternary fuel
combustion mechanism
reaction pathway
作者简介
第一作者:张煜奇,男,硕士研究生,从事生物燃料燃烧应用研究,E-mail:1091667029@qq.com;通信作者:梅德清,男,教授,博士,从事动力机械清洁燃烧与排放控制研究,E-mail:meideqing@ujs.edu.cn。
