摘要
为了降低柴油机燃用中等比例生物柴油-柴油混合燃料的污染物排放,在1 400r/min和2 000r/min不同负荷条件下,首先对比分析了发动机燃用生物柴油-柴油混合燃料与纯柴油的性能差异,然后在中等比例的生物柴油-柴油混合燃料中分别掺混10%和20%(体积比)的无水乙醇,测定了乙醇掺混比对发动机经济性、动力性和排放特性的影响。结果表明:与纯柴油相比,生物柴油-柴油混合燃料的有效燃油消耗率上升,动力性略有下降,炭烟排放降低,而NO_x排放升高。随着乙醇掺混比的增大,生物柴油-柴油-乙醇混合燃料的有效燃油消耗率升高,小负荷时受乙醇汽化潜热的影响导致有效热效率下降,中等负荷时乙醇对有效热效率的影响不大,而大负荷时乙醇的高含氧量能够提高发动机的有效热效率。1 400r/min和2 000r/min全负荷条件下,发动机的最大功率随乙醇掺混比的增大而下降。在不同负荷条件下,随着生物柴油-柴油-乙醇混合燃料中乙醇掺混比的增大,发动机的炭烟、NO_x和CO排放逐渐降低,小负荷时乙醇的高汽化潜热导致HC排放明显升高。
In order to reduce the emissions of diesel engine fueled with biodiesel-diesel blended fuel mixed at medium proportion,the performance differences between biodiesel-diesel blended fuel and pure diesel fuel were analyzed and the influences of ethanol blending ratio on economy,power and emission characteristics were studied by mixing the blended fuel with 10%and 20%of ethanol respectively under different loads of 1 400 r/min and 2 000 r/min.The results show that the brake specific fuel consumption and NO x emission of biodiesel-diesel blended fuel increase and the power and soot emission decrease.With the increase of ethanol blending ratio,the brake specific fuel consumption of biodiesel-diesel-ethanol blended fuel increases.The effective thermal efficiency decreases at low load due to the influence of latent heat from ethanol vaporization,is little influenced at medium load,and increases at high load due to the high oxygen content of ethanol.The maximum power of engine decreases with the increase of ethanol blending ratio under full load conditions of 1 400 r/min and 2 000 r/min.With the increase of ethanol content in biodiesel-diesel-ethanol blended fuel,the soot,NO x and CO emissions decrease gradually under different loads.In addition,the HC emission increases obviously due to the high latent heat caused by strong vaporization of ethanol at low load.
作者
耿莉敏
李士杰
李慧梅
陈阳
程清波
GENG Limin;LI Shijie;LI Huimei;CHEN Yang;CHENG Qingbo(Key Laboratory of Shaanxi Province for Development and Applicationof New Transportation Energy, Chang an University,Xi an 710064,China;Department of Delivery Equipment Support,Academy of Military Transportation,Tianjin 300161,China;Great Wall Motor Company,Baoding 071000,China)
出处
《车用发动机》
北大核心
2018年第2期35-40,共6页
Vehicle Engine
基金
陕西省交通新能源开发
应用与汽车节能重点实验室开放课题资助项目基金项目(310822161121)
中央高校基本科研业务费资助项目(310822172203)
关键词
柴油机
生物柴油
乙醇
混合燃料
经济性
排放特性
diesel engine
biodiesel
ethanol
blended fuel
fuel economy
emission performance
