引用本文:王军方,丁 焰,尹 航,等.DOC技术对柴油机排放颗粒物数浓度的影响[J].环境科学研究,2011,24(7):711-715.
WANG Jun-fang,DING Yan,YIN Hang,et al.Effects of DOC Technology on Particle Number Concentration Emissions by Diesel Engines[J].Reserrch of Environmental Science,2011,24(7):711-715.]
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DOC技术对柴油机排放颗粒物数浓度的影响
王军方1, 丁 焰2, 尹 航3, 葛蕴珊4, 王小臣5, 谭建伟4, 何 超6
1.中国环境科学研究院, 北京 100012;2.中国环境科学研究院, 北京 100013;3.中国环境科学研究院, 北京 100014;4.北京理工大学机械与车辆工程学院, 北京 100081;5.中国汽车技术研究中心, 天津 300162;6.西南林业大学交通机械与土木工程学院, 云南 昆明 650224
摘要:
利用ELPI(电子低压冲击器)对不同转速、不同负荷以及安装DOC(氧化催化转化器)前后颗粒物排放及粒径分布进行了研究. 结果表明:论安装DOC与否,柴油机排放颗粒物数浓度均随发动机转速的增加而增加. 增大负荷,颗粒物数浓度峰值处的粒径也随之增大. 经过DOC催化转化后,柴油机排放颗粒物的大部分仍呈单峰正态分布,且DOC对核模态粒子的氧化转化效率较高. 经过DOC后,在低转速下,不同粒径的颗粒物数浓度均有所降低;中、高转速下,DOC对粒径大于120 nm的颗粒物数浓度明显降低作用.
关键词:  柴油机  氧化催化转化器(DOC)  颗粒物  数浓度  粒径分布
DOI:
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基金项目:国家自然科学基金项目(40805053)
Effects of DOC Technology on Particle Number Concentration Emissions by Diesel Engines
WANG Jun-fang1, DING Yan2, YIN Hang3, GE Yun-shan4, WANG Xiao-chen5, TAN Jian-wei4, HE Chao6
1.Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2.Chinese Research Academy of Environmental Sciences, Beijing 100013, China;3.Chinese Research Academy of Environmental Sciences, Beijing 100014, China;4.School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China;5.China Automotive Technology & Research Center, Tianjin 300162, China;6.Faculty of Transportaion, Machinery & Civil Engineering, Southwest Forestry University, Kunming 650224, China
Abstract:
Measurements of particle number emissions and particle size distributions from a diesel engine under different rotation speeds and loads, and with and without a diesel oxidation catalyst (DOC), were performed using an electrical low-pressure impactor (ELPI). The results showed that the number concentration of particles increased with the speed of the engine regardless of whether or not the DOC was used. With increasing engine load, the peak number concentration occurred at a larger diameter. After the DOC, the particles still mostly showed a unimodal normal distribution, and the DOC had a high conversion efficiency on nucleation mode particles. Under low engine speed conditions, particles at all diameters on average showed lower number concentrations. Under medium and high engine speed conditions, the DOC showed no clear impact on number concentrations of particles greater than 120 nm in diameter.
Key words:  diesel engine  diesel oxidation catalyst (DOC)  particulate matter  number concentration  size distribution