首页|防爆柴油机排气颗粒物的微观结构研究

防爆柴油机排气颗粒物的微观结构研究

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为研究废气水洗箱和含氧燃料对防爆柴油机排气颗粒物微观结构随工况变化的影响,利用扫描电子显微镜(Scananing Elecron Microscope,SEM)对 0#柴油(D100)和丁醇/柴油混合燃料(BD20)的排气颗粒物的微观形貌、分形特征和粒径分布进行研究.其中,丁醇的质量分数为20％.结果显示:经过废气水洗箱后,颗粒物内吸附质含量增多,密集程度升高,在多数工况下,颗粒物支链减少,且BD20有利于减少颗粒物碳烟粒子含量;颗粒物的计盒维数分布在1.70-1.85,且经过废气水洗箱的颗粒物结构更紧密,计盒维数更大,D100的计盒维数大于BD20的计盒维数;颗粒物基础碳粒子粒径分布在10～90 nm,废气水洗箱对颗粒物有沉降作用,使颗粒物平均粒径减小,BD20的平均粒径小于D100平均粒径.
Microstructure analysis of explosion-proof diesel engine exhaust particles
To investigate the effects of the exhaust gas wash tank and oxygenated fuel on the microstructure of the exhaust particulate matter of explosion-proof diesel engines as a function of operating conditions,the microstructure of the exhaust particulate matter of 0# diesel(D100)and 20％butanol/diesel blend(BD20)was observed by Scanning Electron Microscopy(SEM),and the fractal characteristics of the particulate matter were calculated and averaged using box-counting dimension software and the particle size distribution was calculated using particle size distribution software and the data were processed.The results show that after the exhaust gas washing tank,the adsorbent content in the particulate matter increases,the density increases,and the particulate matter branched chain decreases under most working conditions;BD20 is beneficial to reduce the particulate matter carbon soot particle content,mainly because D100 contains polycyclic aromatic hydrocarbon components that are easy to generate exhaust particulate matter precursors and BD20 contains higher oxygen content;The distribution range of the cassette dimension of the particulate matter is from 1.70 to 1.85,and the structure of the particulate matter after the exhaust gas washing tank is more compact;the cassette dimension increases,and the cassette dimension of D100 is larger than that of BD20,and the cassette dimension of the particulate matter increases with the increase of load and speed;the particle size distribution of the base carbon particles of the particulate matter is from 10 nm to 90 nm,and the exhaust gas washing tank has a sedimentation effect on the particulate matter;the average particle size of the particulate matter decreases,and the average particle size of BD20 decreases.The average particle size of BD20 is smaller than that of D100;with the increase of load,the particle size of D100 changes more obviously than that of BD20;the particle size of both fuels increases with the increase of rotational speed.

safety and hygiene engineering technologyexplosion-proof diesel enginemicromorphologycounting box dimensionbasic carbon particles

李阳阳、朱蕙、何泽、郑子康、崔宇宣

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长安大学能源与电气工程学院,西安 710064

陕西省交通新能源开发、应用与汽车节能重点实验室,西安 710064

安全卫生工程技术 防爆柴油机 微观形貌 计盒维数 基础碳粒子

中央高校基本科研业务费资助项目陕北矿区煤矿空气净化与职业健康基础研究及关键技术装备与示范项目

300102383501SMHLL-JS-YJ-2020006

2024

10.13637/j.issn.1009-6094.2023.0785

安全与环境学报
北京理工大学 中国环境科学学会 中国职业安全健康协会

安全与环境学报

CSTPCD北大核心
影响因子：0.943
ISSN：1009-6094
年,卷(期)：2024.24(5)