摘要
为研究氧化催化转化器(DOC)对柴油机燃用不同调合生物柴油(BO、B10、B20)后排气颗粒物粒径分布及组分的影响规律,利用MOUDI对颗粒物进行分级采样,对分级颗粒称重得到质量浓度分布,利用热重分析仪分析颗粒物热重特性及组分变化.结果表明:未加装DOC时,随着生物柴油比例的增加,各粒径级颗粒物质量浓度均降低,B20降幅最大;颗粒物质量浓度峰值范围内的粒径大小处于0.18~0.32μm,SOF质量分数依次升高,无机盐和Soot质量分数依次降低.加装DOC后,颗粒物质量浓度降低,DOC对粒径大于1μm颗粒转化效果不明显,聚集态颗粒质量浓度转化效率明显高于粗粒子态颗粒,B20聚集态转化效率最高,可达61.6%.随着转速的升高,转化效率明显降低,颗粒中SOF质量分数降低,H_2O、Soot,无机盐质量分数均增大.
In order to reveal the effects of diesel oxidation catalyst(DOC)on size distribution and components ofparticulate matter emitted from diesel-biodiesel dual fuel(B0,B10,B20),an experimental study was carried on a dieselengine.Particle samples from different size grades were got from MOUDI and distribution of the mass concentration wasobtained by weighting the particle.Beside,thermogravimetric characteristics of particle and varieties of components wereanalyzed by using thermogravimetric analyzer.Results showed that with the increase of biodiesel percentage,the massconcentration of every size grade decrease and it was especially obvious when B20was used.The mass concentration peakvalue of particulate matter emitted from three fuels all range from0.18μm to0.32μm.In addition,with the increasementof biodiesel percentage,the mass concentration of SOF increased while mineral salt and soot decreased.When DOC wasused,the mass concentration of particulate matter decreased and the convert efficiency was not evident for particle above1μm.The convert efficiency of accumulation state particles higher than that of coarse particle.Moreover,with theincreasing of speed,the mass concentration of SOF decreased,while H2O,soot and mineral salt increased.
作者
杜家益
周仁双
张登攀
周小强
夏群
袁银男
DU Jia-yi;ZHOU Ren-shuang;ZHANG Deng-pan;ZHOU Xiao-qiang;XIA Qun;YUAN Yin-nan(School of Automotive and Traffic Engineering,Jiangsu University, Zhenjiang 212013, China;School of Energy, Soochow University, Suzhou 215006, China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第2期497-502,共6页
China Environmental Science
基金
国家自然科学基金资助项目(50578020)
江苏省高校自然科学研究重大项目(13KJA470001)
江苏高校优势学科建设工程资助项目(PAPD)
关键词
DOC
生物柴油
颗粒物
粒径分布
组分
DOC
biodiesel
particulate matter
size distribution
components
