Qi Dandan, Chen Mingxiao, Yang Kaixuan, Li Tianjiao, Ying Yaoyao, Liu Dong
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China; Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China; Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.
J Hazard Mater. 2024 Mar 15;466:133669. doi: 10.1016/j.jhazmat.2024.133669. Epub 2024 Feb 1.
This study explored the impact of non-thermal plasma and CO on the flame soot characteristics within the diffusion flames. We analyzed on flame structures that were diluted with either CO or N, temperature distributions, and soot characteristics, both in the presence and absence of plasma. Due to the higher specific heat capacity of CO compared to N, the optical observations consistently showed lower temperatures in flames diluted with CO as compared to those diluted with N. The inclusion of plasma and carbon dioxide resulted in the lowest soot concentration, indicating that plasma coupled with CO has a synergistic inhibitory effect on soot emissions. The findings revealed that when CO was used to dilute the flames and the oxygen concentration was low, the soot nanostructure appeared amorphous. Raman results showed that the level of graphitization observed in soot particles from CO dilution flames was lower than that from N dilution flames. In the presence of plasma and CO, the soot obtained exhibited the shortest fringe length and the highest fringe tortuosity. Significant correlations were observed between the nanostructure of soot and its reactivity. The combined application of plasma and CO proved to be effective in reducing the soot carbonization degree.
本研究探讨了非热等离子体和一氧化碳对扩散火焰中火焰碳烟特性的影响。我们分析了在有和没有等离子体的情况下，用一氧化碳或氮气稀释的火焰结构、温度分布以及碳烟特性。由于一氧化碳的比热容高于氮气，光学观测结果一致表明，与用氮气稀释的火焰相比，用一氧化碳稀释的火焰温度更低。等离子体和二氧化碳的加入导致碳烟浓度最低，这表明等离子体与一氧化碳对碳烟排放具有协同抑制作用。研究结果表明，当用一氧化碳稀释火焰且氧气浓度较低时，碳烟纳米结构呈现无定形。拉曼结果表明，一氧化碳稀释火焰中碳烟颗粒的石墨化程度低于氮气稀释火焰。在等离子体和一氧化碳存在的情况下，所获得的碳烟具有最短的条纹长度和最高的条纹曲折度。观察到碳烟的纳米结构与其反应性之间存在显著相关性。事实证明，等离子体和一氧化碳的联合应用在降低碳烟碳化程度方面是有效的。
