Effects of NH3 and H2 addition on morphology, nanostructure and oxidation of soot in n-decane diffusion flames

IF 7.2 2区 工程技术 Q1 CHEMISTRY, APPLIED Fuel Processing Technology Pub Date : 2023-12-14 DOI:10.1016/j.fuproc.2023.108003
Zhiyu Yan , Tianyi Zhu , Xin Xue , Hu Liu , Qianqian Li , Zuohua Huang
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Abstract

The effects of ammonia and hydrogen addition on soot formation characteristics in n-decane laminar diffusion flames were studied. The addition of argon was specifically considered to identify the chemical effect of ammonia. The flame temperature, particle morphology, and oxidation characteristics were analyzed. Results showed that both ammonia and hydrogen addition increase the flame height and suppress soot formation, while the suppression effect of ammonia is more pronounced. The addition of argon or ammonia reduces the temperature of flame upstream and yields the similar flame temperature, while hydrogen addition increases the flame temperature. Compared to the flame with argon, the addition of ammonia delays particle nucleation, indicating that the soot nucleation and growth process are chemically inhibited. In contrast, doping hydrogen leads to an earlier nucleation process and aggregation phenomenon. Further analysis on particle nanostructure indicated that the addition of ammonia yields shorter lattice fringes, larger interlayer spacings and amorphous carbon contents, demonstrating a looser and higher disorder internal structure. The addition of hydrogen yields longer fringes and smaller interlayer spacings, showing the particles have a more compact internal structure and higher degree of graphitization. This indicates hydrogen addition reduces the oxidation activity of the particles, which is confirmed by thermogravimetric analysis.

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添加 NH3 和 H2 对正癸烷扩散火焰中烟尘的形态、纳米结构和氧化的影响
研究了氨和氢对正癸烷层流扩散火焰中烟灰形成特性的影响。特别考虑加入氩气来确定氨的化学效应。分析了火焰温度、颗粒形貌和氧化特性。结果表明,氨和氢的加入均能提高火焰高度,抑制烟尘的形成,其中氨的抑制效果更为明显。氩气和氨气的加入降低了上游火焰的温度,产生了相似的火焰温度,而氢气的加入使火焰温度升高。与氩气火焰相比,氨气的加入延迟了颗粒的成核,表明烟灰的成核和生长过程受到了化学抑制。相反,掺杂氢会导致更早的成核过程和聚集现象。对颗粒纳米结构的进一步分析表明,氨的加入使晶格条纹更短,层间间距更大,无定形碳含量更高,内部结构更松散,无序程度更高。氢的加入使条纹变长,层间间距变小,表明颗粒内部结构更致密,石墨化程度更高。这表明氢的加入降低了颗粒的氧化活性,热重分析证实了这一点。
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来源期刊
Fuel Processing Technology
Fuel Processing Technology 工程技术-工程:化工
CiteScore
13.20
自引率
9.30%
发文量
398
审稿时长
26 days
期刊介绍: Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.
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