辛酸甲酯与正丁醇在低速柴油机中的氮氧化物排放特性仿真分析  

Simulation Analysis of NO_(x) Emission Characteristics about Methyl Octanoate and n-Butanol in Low-Speed Diesel Engine

作　　者：田策 姚丽 TIAN Ce;YAO Li(Merchant Marine College,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学商船学院,上海201306

出　　处：《船海工程》2022年第5期94-98,共5页Ship & Ocean Engineering

基　　金：国家自然科学基金重大研究计划(91441132)。

摘　　要：以生物柴油替代燃料辛酸甲酯,建立辛酸甲酯(MO)与正丁醇(NBA)的混合燃料燃烧反应机理,通过CHEMKIN软件中的均质充量压燃反应器模拟混合燃料在船用低速柴油机中的燃烧,计算氮氧化物体积分数随曲轴转角(CA)变化关系,分析1∶1混合比例下,混合燃料在不同工况下的NO_(x)排放特性,结果表明,正丁醇掺混比例增加和发动机转速降低会使氮氧化物的体积分数降低;在1.2~26.1(°)CA内NO体积分数下降原因之一是NO转化为N_(2),NO_(2)体积分数下降的原因是NO_(2)转化为NO,而其在26.1~126(°)CA内上升的原因是由NO转化而来;N_(2)O在1.2(°)CA后体积分数下降的主要原因之一是N_(2)O转化为N_(2)。The combustion reaction mechanism of mixed fuel for methyl octanoate(MO)and n-butanol(NBA)was established by replacing MO with biodiesel.The burning situations of mixed fuel in a low-speed marine diesel engine was simulated by applying homogeneous charge compression ignition reactor of CHEMKIN,and the concentration of nitrogen oxides(NO_(x))differing with the crank rotation angle(CA)was calculated.The reaction process of NO_(x) was analyzed for the mixed fuel of different working conditions at the 1:1 blending ratio.The results showed that the emissions of NO_(x) decreases with increasing of n-butanol blending ratio and the decreasing of engine speed,and at the range of 1.2°~26.1°CA,for the conversion of NO to NO_(2),and NO_(2) concentration decreases due to the conversion of NO_(2) to NO.At the same time,at the range of 26.1°~126°CA,the NO_(2) concentration increases due to the conversion of NO to NO_(2).And higher than 1.2°CA,the decrease of N_(2)O concentration is for the conversion of N_(2)O to N_(2).

关 键 词：辛酸甲酯 正丁醇 船用低速柴油机 均质充量压燃 氮氧化物 

分 类 号：U676.3[交通运输工程—船舶及航道工程]