Simulation Study on the Effect of Hydrogen/Nitrogen Addition on Soot Formation in Ethylene Diffusion Flames

YAN Zhiyu; SHI Congling; XIONG Xinyi; LEI Bohan; LI Qianqian; WANG Jinhua; HUANG Zuohua

doi:10.7652/xjtuxb202510013

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Simulation Study on the Effect of Hydrogen/Nitrogen Addition on Soot Formation in Ethylene Diffusion Flames

更新时间：2025-09-28

- Simulation Study on the Effect of Hydrogen/Nitrogen Addition on Soot Formation in Ethylene Diffusion Flames
- Journal of Xi'an Jiaotong University Vol. 59, Issue 10, Pages: 137-147(2025)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202510013
  CLC： TK40
- Received：05 February 2025，
  
  Published：10 October 2025
- 稿件说明：
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YAN Zhiyu, SHI Congling, XIONG Xinyi, et al. Simulation Study on the Effect of Hydrogen/Nitrogen Addition on Soot Formation in Ethylene Diffusion Flames[J]. Journal of Xi'an Jiaotong University, 2025, 59(10): 137-147.
DOI：

YAN Zhiyu, SHI Congling, XIONG Xinyi, et al. Simulation Study on the Effect of Hydrogen/Nitrogen Addition on Soot Formation in Ethylene Diffusion Flames[J]. Journal of Xi'an Jiaotong University, 2025, 59(10): 137-147. DOI： 10.7652/xjtuxb202510013.

摘要

针对氢气添加对碳烟生成是化学促进还是抑制的问题，采用二维数值模拟对纯乙烯、添加氮气和添加氢气的同轴协流扩散火焰开展了系统研究。分析了添加30%体积分数的氢气、氮气后，其对火焰温度、碳烟体积分数、颗粒生长、成核、前驱物演变和氧化等过程的影响，获取了相关特征参数的变化规律，阐明了低比例氢气添加对碳烟生成的化学促进作用机制。模拟结果表明：相较于添加体积分数为30%的氧气火焰，添加体积分数为30%的氢气火焰能够在一定程度上促进碳烟形成，碳烟峰值体积分数从4.37×10

-6

增加至4.52×10

-6

，但掺氢引起的温度场变化对碳烟生成的影响作用较小；掺氢带来的化学促进作用主要通过加速多环芳香烃（PAHs）的生成和颗粒成核速率实现，进而在PAHs沉积作用而非脱氢加乙炔反应主导下促使颗粒质量增加；掺氢能够通过同时增加OH和O

的氧化速率促进颗粒氧化，但其带来的化学促进颗粒生长作用要大于氧化促进作用。该研究可为掺氢燃烧的碳烟颗粒控制提供理论依据。

Abstract

To address the question of whether hydrogen addition chemically promotes or inhibits soot formation

a two-dimensional numerical simulation is conducted to systematically investigate pure ethylene

nitrogen-added

and hydrogen-doped co-flow diffusion flames. The effects of adding 30% hydrogen/nitrogen by volume on flame temperature

soot volume fraction

particle grow

nucleation

precursor evolution

and oxidation processes are analyzed. The variations in key characteristic parameters are obtained

and the mechanism of the chemical promotion effect of low-proportion hydrogen addition on soot formation is elucidated. The simulation results show that compared to nitrogen-diluted flames

the addition of 30% hydrogen slightly promotes soot formation

with the peak soot volume fraction increasing from 4.37×10

-6

to 4.52×10

-6

while the influence of hydrogen-induced temperature field changes on soot formation is minor. The chemical promotion effect of hydrogen addition is primarily achieved by accelerating the formation of polycyclic aromatic hydrocarbons (PAHs) and particle nucleation rates

thereby enhancing particle mass growth through PAHs deposition rather than dehydrogenation-acetylene reactions. Although hydrogen addition promotes particle oxidation by simultaneously increasing OH and O

oxidation rates

its chemical promotion of particle growth outweighs the oxidation enhancement. This study provides theoretical insights for controlling soot particles in hydrogen-doped combustion.

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references

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