聚甲氧基二甲醚-柴油混合燃料对柴油机燃烧与排放的影响  

Effect of PODE_(3-8)-Diesel Blended Fuel on Combustion and Emissions of Diesel Engine

作　　者：冯浩杰 孙平[1] 刘军恒[1] 刘少康[1] 王玉梅[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《石油学报（石油加工）》2016年第4期816-822,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：江苏省高校自然科学研究项目(14KJA470001)基金资助

摘　　要：在柴油中掺混体积分数为5%、10%和15%的聚甲氧基二甲醚(PODE3-8)得到PODE3-8-柴油混合燃料,利用热重分析仪在氧气气氛下对这些混合燃料样品进行热分析,考察其挥发和氧化特性,计算热分析参数;在柴油机上考察它们的燃烧与排放性能,并与柴油对比。结果表明,随掺混比的增加,3种PODE3-8-柴油混合燃料的起始质量损失温度相对于柴油降低了3.4℃、5.6℃和7.0℃,起始燃烧温度降低了6.4℃、11.8℃和17.2℃,热稳定性降低,同时综合燃烧特性指数提高。在额定工况下,与燃用柴油相比,柴油机燃用PODE3-8-柴油混合燃料时,滞燃期缩短,缸内最高压力略有提高;在预混燃烧阶段放热率峰值有所降低,在扩散燃烧阶段放热率峰值提高;比油耗相对于柴油分别增加0.8%、3.2%和8.5%,但有效热效率提高2.8%、4.2%和3.1%;CO排放分别降低了11.8%、14.0%和18.8%,HC排放分别降低了19.2%、26.8%和21.7%,排气烟度分别降低了25.2%、30.8%和32.1%,NOx排放基本不变。PODE3-8-diesel blended fuels with 5%, 10% and 15% volume fraction of PODE3-8, respectively, were prepared, and their volatility, oxidation characteristic and thermal parameters were studied and calculated by using thermogravimetric analyzer under O2atmosphere. The combustion and emission characteristics of the diesel engine fueled with these blended fuels were investigated and compared to diesel fuel. Results showed that compared with diesel fuel, initial mass loss temperatures of the blended fuels with the increase of PODE3-8ratio were decreased by 3.4, 5.6 and 7, and initial combustion temperatures were decreased by 6.4, 11.8 and 17.2, respectively. The thermal stability decreased and the composite combustion index increased. At the rated conditions, compared to combustion of diesel fuel, the ignition delay period shortened, the peak heat release rate in premixed combustion section decreased, the highest cylinder pressure and the peak heat release rate in diffusion combustion section increased as combustion of the blended fuels. As compared with diesel fuel, brake specific fuel consumptions of the three blended fuels were increased by 0.8%, 3.2% and 8.5%, but the effective thermal efficiency were increased 2.8%, 4.2% and 3.1%, respectively. CO emissions were decreased by 11.8%, 14.0% and 18.8%, HC emissions were decreased by 19.2%, 26.8% and 21.7%, and smoke emissions were decreased by 25.2%, 30.8% and 32.1% in turn by PODE3-8volume fraction when fueled with the three blended fuels, while NOxemissions changed little. © 2016, Science Press. All right reserved.

关 键 词：聚甲氧基二甲醚 热重分析 燃烧 排放 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]