摘要
单缸柴油机作为小型农用机械不可或缺的动力源,在使用过程中会产生大量污染物.其中氮氧化合物(NO_(x))和颗粒(PM)是气溶胶的主要组成部分,对大气环境造成了严重污染.为有效改善农用单缸柴油机NO_(x)和PM排放,本研究通过添加生物柴油对柴油进行改质以及采用机内EGR净化技术两种方案,测量了柴油机分别燃用柴油B0,生物柴油调合燃料B20、B50在不同EGR率下的NO_(x)和PM排放.结果表明,采用EGR技术能够明显改善柴油机的NO_(x)排放,但同时会引起碳烟排放的增加.通过在柴油中添加生物柴油能够在一定程度上降低碳烟排放,其中高负荷、大EGR率条件下的改善最为明显.在2000 r·min^(-1)、75%负荷,EGR率为30%时,燃用B50的碳烟排放与燃用B0相比降低了47.3%.总体上柴油中添加生物柴油与EGR技术共同作用能够有效降低柴油机高负荷工况时的颗粒排放总数量.
Various pollutants are caused by the single cylinder diesel engine which is an indispensable power for small agricultural machinery. Among these pollutants, nitrogen oxides(NO_(x)) and particulate matters(PM) are the main components of aerosols which have a strong effect on air pollution. In order to make the better NO_(x) and PM emissions of agricultural single cylinder diesel engine, the emission of NO_(x) and PM from diesel engine fueled with B0, B20 and B50 at different EGR rates were studied by means of fuel upgrading and internal purification technology. The results show that the utilization of the EGR technology can obviously reduce the NO_(x) emission of diesel engine, but the soot emission is increased. The soot emission can be reduced by adding biodiesel into the diesel engine, the best case appears under the condition of high load and large EGR rate. The soot emission of B50 is 47.3% lower than that of B0 in the case of 2000 r·min^(-1), 75% load and 30% EGR rate. The combined effects of biodiesel and EGR technology can effectively reduce the total number of particles in the high load condition of diesel engine.
作者
谢纬安
瞿磊
王忠
刘帅
冯伟杰
XIE Weian;QU Lei;WANG Zhong;LIU Shuai;FENG Weijie(School of Automotive and Traffic Engineering,Nantong Vocational University,Nantong 226007;School of Automobile and Traffic Engineering,Jiangsu University,Zhenjiang 212013)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第3期914-921,共8页
Acta Scientiae Circumstantiae
基金
国家自然科学基金资助项目(No.51776089)
江苏省高等学校自然科学研究面上项目(No.18KJD470005)。
关键词
农用柴油机
排放
生物柴油
废气再循环
agricultural diesel engine
emission
biodiesel
exhaust gas recirculation