| 柴油/甲醇燃烧颗粒的碳结构参数分析 |
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| 引用本文： | 赵 洋,王宇成,王 忠,李瑞娜,李铭迪,刘 帅.柴油/甲醇燃烧颗粒的碳结构参数分析[J].环境科学研究,2014,27(12):1472-1478. |
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| 作者姓名： | 赵 洋 王宇成 王 忠 李瑞娜 李铭迪 刘 帅 |
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| 作者单位： | 江苏大学汽车与交通工程学院, 江苏 镇江 212013 |
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| 基金项目： | 国家自然科学基金项目(51376083)；江苏省高校自然科学基金重点项目(13KJA470001)；江苏省2013年研究生创新计划项目(CXZZ13_0672) |
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| 摘 要： | 为探讨非道路柴油机燃用柴油/甲醇混合燃料排气颗粒中碳结构的演变规律,降低非道路柴油机的颗粒(PM)排放,采用激光拉曼光谱仪,结合分峰拟合方法,重点针对甲醇掺混比对非道路柴油机燃烧颗粒的碳结构参数和演变规律进行分析,并用颗粒氧化特性试验对拟合分析结果进行验证. 结果表明,随着燃料中甲醇掺混比(以w计)的增加:①NOx、CO、HC比排放呈上升趋势,与柴油相比,甲醇掺混比为15%时,3种污染物比排放分别升高约12%、49%、62%；颗粒比排放降幅明显,约为59%. ②由于颗粒碳原子和碳键的伸缩振动,在1 350和1 590 cm-1附近出现2个较为强烈并有一定重合的拉曼振动峰；颗粒中C—C的伸缩振动以及弯曲振动加剧,在345 cm-1附近出现较为强烈的拉曼振动峰. ③表征颗粒中无定形成分的D3峰的相对强度(R3值)明显升高,表明颗粒中的碳团簇含量增加,石墨晶体结构的无序程度升高；表征颗粒中石墨化程度的D1~D4、G峰的FWHM(半宽度)和D/G相对强度整体呈上升趋势,说明颗粒的石墨化程度降低,颗粒较容易被氧化. ④颗粒的活化能逐渐降低,也说明掺混甲醇后,颗粒具有较好的氧化性能,有利于加速颗粒在缸内的氧化速度,缩短颗粒捕集器中过滤体的再生时间,降低柴油机的颗粒排放.
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| 关 键 词： | 非道路柴油机 颗粒 甲醇 拉曼光谱 碳结构 |
| 收稿时间： | 2014/3/5 0:00:00 |
| 修稿时间： | 2014/7/10 0:00:00 |
Carbon Structure Parameter Analysis of Particulate Matter from Diesel/Methanol Combustion |
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| ZHAO Yang,WANG Yu-cheng,WANG Zhong,LI Rui-n,LI Ming-di and LIU Shuai.Carbon Structure Parameter Analysis of Particulate Matter from Diesel/Methanol Combustion[J].Research of Environmental Sciences,2014,27(12):1472-1478. |
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| Authors: | ZHAO Yang WANG Yu-cheng WANG Zhong LI Rui-n LI Ming-di and LIU Shuai |
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| Affiliation: | School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China |
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| Abstract: | The present study mainly reports the effects of methanol blending ratio on carbon structure by laser Raman spectrometer and peak fitting. Blends of diesel with 0,5% and 15% methanol (designated here as M0, M5 and M15) were used in a non-road diesel engine. The oxidation curve of particles in O2 atmosphere and oxidation kinetics parameters were calculated to confirm the results of carbon structure analysis. The results showed that:1)The brake NOx, CO, HC emission has obvious rise with the increase of methanol blending ratio, emissions generated by M15 were significantly increased by 12%, 49%, 62%, respectively. However, the brake particulate emission was significantly reduced by 59%. 2)Two strong and overlapping Raman peaks appeared at about 1350 cm-1 and 1590 cm-1, due to the stretching vibration between the carbon bonds in particles. Strong Raman peaks appearing at about 345 cm-1 appeared with the increase of methanol blending ratio, which was probably because of the increase of the stretching vibration between carbon bonds in particles. 3)The relative strength of D3, which could be reflected by the amorphous components, and D/G reflecting graphitization degree increased along with the increase of methanol blending ratio, and the FWHM and relative strength of D1-D4, G also increased along with the increase of methanol blending ratio. The data confirm that as methanol use increases, the degree of graphitization in particulates decreases, the disorder of graphite structure increases, the amount of molecular carbon increases and the particulates can be oxidized more easily. 4)The oxidation experiment of particulates generated from diesel/methanol combustion also confirmed that the addition of methanol in diesel fuel is conducive to the oxidation of particulates, and shortening the regeneration time of particle in the filter body. |
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| Keywords: | diesel engine particulate methanol raman spectrometer carbon structure |
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