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Influence of thermal ageing on oxidation performance and nanostructures of dry soot in diesel engine

热老化对柴油机干碳烟氧化性能和纳米结构的影响

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Abstract

Diesel soot subjected to high exhaust temperature suffers from thermal ageing, which is difficult to be removed by regeneration process. Based on the thermogravimetric (TG) analysis and images by high resolution transmission electron microscope (HRTEM), effects of thermal ageing temperature, ageing time and oxygen concentration on oxidation characteristic of soot are investigated. The activation energy of soot increases with the increase of ageing temperature and oxygen concentration. The activation energy increases rapidly when the ageing time is less than 45 min, and then it keeps in a value of 157 kJ/mol when the ageing time is between 45 and 60 min. Compared to the soot without thermal ageing, the shape of ageing soot particles presents shorter diameter and more regular circle by observing soot nanostructure. With the increase of ageing temperature, ageing time and oxygen concentration, the more stable structure of “shell and core” is shown in the basic carbon. The soot has an increased fringe length, decreased tortuosity and separation distance after thermal ageing process, which leads to the deepening of the disorder degree of soot nanostructures and reduction of soot oxidation activity. Consequently, the thermal ageing process should be avoided in order to optimize the active regeneration strategy.

摘要

柴油机碳烟在高排气温度下会发生热老化,难以通过再生过程去除。 本文基于热重(TG)分析和高分辨透射电镜(HRTEM)成像,研究了老化温度、老化时间和氧浓度对碳烟氧化特性的影响。 碳烟的活化能随老化温度和氧浓度的增加而增加。 当老化时间少于45 min 时活化能迅速增加,老化时间处于45~60 min 时活化能稳定在157 kJ/mol 左右。 通过观察碳烟纳米结构可以发现:与未经过热老化的碳烟相比,老化后的碳烟颗粒直径更短,呈更规则的圆形。 随着老化温度、老化时间和氧浓度的增加,基本碳粒的“壳-核”结构更稳定。 经过热老化后,碳烟边缘长度增加,弯曲度和微晶层间距减小,碳烟纳米结构紊乱程度加深,碳烟的氧化活性降低。 因此,优化主动再生策略应避免热老化过程。

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Funding

Project(51676167) supported by the National Natural Science Foundation of China; Project(17TD0035) supported by the Sichuan Provincial Scientific Research Innovation Team Program, China; Projects(2017TD0026, 2015TD0021) supported by Science & Technology Department of Sichuan Province, China

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Authors and Affiliations

  1. Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, 610039, China

    Zhong-wei Meng  (孟忠伟), Qian Zhang  (张倩), Jun-feng Huang  (黄俊峰), Yuan Jiang  (蒋渊), Yuan Qin  (秦源) & Jia Fang  (方嘉)

  2. Vehicle Measurement, Control and Safety Key Laboratory of Sichuan Province, Xihua University, Chengdu, 610039, China

    Zhong-wei Meng  (孟忠伟), Qian Zhang  (张倩), Jun-feng Huang  (黄俊峰), Yuan Jiang  (蒋渊), Yuan Qin  (秦源) & Jia Fang  (方嘉)

  3. Chengdu Qingzhouteji Environmental Protection Equipment Co., Ltd., Chengdu, 610300, China

    Jian Li  (李健)

  4. Department of Chemical and Biomolecular Engineering, University of Akron, Akron, OH, 44325-3906, USA

    G. G. Chase

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  1. Zhong-wei Meng  (孟忠伟)
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Contributions

MENG Zhong-wei provided the idea of the study, and led the research activity planning and execution. LI Jian conducted all the experiments and drafted the manuscript. ZHANG Qian, HUANG Jun-feng, JIANG Yuan and QIN Yuan conducted the experiments, and analyzed the experimental data. CHASE G G revised the manuscript. FANG Jia revised the manuscript and was responsible for the submission and reply of the manuscript as the corresponding author. All the authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Jia Fang  (方嘉).

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Conflict of interest

MENG Zhong-wei, LI Jian, ZHANG Qian, HUANG Jun-feng, JIANG Yuan, QIN Yuan, G G CHASE, FANG Jia declare that they have no conflict of interest.

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Meng, Zw., Li, J., Zhang, Q. et al. Influence of thermal ageing on oxidation performance and nanostructures of dry soot in diesel engine. J. Cent. South Univ. 28, 2206–2220 (2021). https://doi.org/10.1007/s11771-021-4759-x

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