刘军恒，杨军，周海磊，孙平，嵇乾，赵廉.聚甲氧基二甲醚-甲醇混合燃料的燃烧与排放特性研究[J].内燃机工程,2021,42(2):16-22.
聚甲氧基二甲醚-甲醇混合燃料的燃烧与排放特性研究
Investigation on Combustion and Emission Characteristics of Polyoxymethylene Dimethyl Ethers-Methanol Blends
DOI：10.13949/j.cnki.nrjgc.2021.02.003
关键词:压燃式发动机  甲醇  聚甲氧基二甲醚  燃烧过程  排放
Key Words:compression ignition engine  methanol  polyoxymethylene dimethyl ethers(PODE)  combustion process  emission
基金项目:国家自然科学基金项目(51806086)；中国博士后科学基金项目(2020M672133)
作者单位
刘军恒，杨军，周海磊，孙平，嵇乾，赵廉 1. 江苏大学 汽车与交通工程学院，镇江 212013
2. 潍柴动力股份有限公司，潍坊 261061 
摘要点击次数: 3519
全文下载次数: 1155
摘要:将甲醇按体积比0、10%、20%、30%分别掺混到聚甲氧基二甲醚(polyoxymethylene dimethyl ethers, PODE)中制备出PODE-甲醇混合燃料，并依次标记为M0、M10、M20和M30，在一台高压共轨发动机上研究了最大转矩转速不同负荷下混合燃料的缸内燃烧过程和排放性能。结果表明：在PODE中添加甲醇后，各负荷下缸内压力降低，滞燃期逐渐延长，放热始点推迟。低负荷和中负荷时甲醇体积比的增加会使放热率峰值先增加后减小，而高负荷下放热率峰值却逐渐升高。甲醇体积比较低时，各负荷下燃烧持续期缩短；当甲醇体积比为30%时，中低负荷下燃烧持续期延长，各负荷下燃烧重心（CA50）推迟。掺烧甲醇可以降低NOx浓度，M30较M0降低幅度为28.1%；而随甲醇体积比的增加，各负荷下HC和CO排放量均呈上升趋势，烟度则先减小后增大。甲醇的低温氧化使混合燃料的甲醛排放量上升，同时NO2排放量及NO2占NOx比例随甲醇体积比的升高而增加，与纯PODE相比，低负荷下M30的NO2排放量和NO2占NOx比例增幅分别为65%和107%。
Abstract:According to the volume fraction of 0, 10%, 20% and 30%, methanol was blended into polyoxymethylene dimethyl ethers (PODE) to prepare the PODE-methanol blends and marked as M0, M10, M20 and M30, respectively. The in-cylinder combustion process and emission performance of the blends at different loads and maximum torque speed was studied on a high pressure common rail diesel engine. Results show that the in-cylinder pressure decreases and the ignition delay period is gradually prolonged by using PODE methanol blends. With the increase of methanol ratio at low and medium loads, the peak value of heat release rate increases first and then decreases, while the peak value of heat release rate increases gradually at high lows. When the volume fraction of methanol is low, the combustion duration is shortened under various loads. When the volume fraction of the methanol reaches 30%, the combustion duration is prolonged under low and medium loads, and the heat release center (CA50) is delayed under various loads. With the increase of the volume fraction of methanol, the emission of NOx decreases while the emission of HC and CO increases, and the smoke emission decreases first and then increases. Formaldehyde emission increases gradually due to the low temperature oxidation of methanol. At the same time, the NO2 emission and NO2/NOx ratio increase with the increase of the volume fraction of methanol. Compared with pure PODE, the NO2 emission and NO2/NOx ratio of M30 at low loads increase by 65% and 107%, respectively.
查看全文  HTML   查看/发表评论