Numerical simulation of soot formation in propane laminar diffusion flame in O2/N2 and O2/CO2 atmosphere

LIANG Bowen; WANG Chengjing; ZHANG Yindi; GONG Huanwen; XIN Yue; GUO Xinze; LIN Qiao

doi:10.19666/j.rlfd.202203043

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Numerical simulation of soot formation in propane laminar diffusion flame in O₂/N₂ and O₂/CO₂ atmosphere

更新时间：2025-09-28

- Numerical simulation of soot formation in propane laminar diffusion flame in O₂/N₂ and O₂/CO₂ atmosphere
- Thermal Power Generation Vol. 51, Issue 8, Pages: 164-173(2022)
- 作者机构：
  
  1. 长江大学石油工程学院
  2. 油气钻采工程湖北省重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202203043
  CLC： TK16
- Published：2022
- 稿件说明：
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LIANG Bowen, WANG Chengjing, ZHANG Yindi, et al. Numerical simulation of soot formation in propane laminar diffusion flame in O₂/N₂ and O₂/CO₂ atmosphere[J]. Thermal power generation, 2022, 51(8): 164-173.
DOI：

LIANG Bowen, WANG Chengjing, ZHANG Yindi, et al. Numerical simulation of soot formation in propane laminar diffusion flame in O₂/N₂ and O₂/CO₂ atmosphere[J]. Thermal power generation, 2022, 51(8): 164-173. DOI： 10.19666/j.rlfd.202203043.

摘要

富氧燃烧因其在强化燃烧和减少污染物排放方面的优势，被认为是一种极具潜力的清洁燃烧和碳捕集技术。基于有限速率化学反应模型，采用GRI-Mech3.0气相反应机理结合详细的热力学及输运数据，数值研究了2种富氧条件下丙烷同向流动扩散火焰中碳烟的生成，构建非反应性物质FCO_2，探究了CO_2化学效应对丙烷火焰碳烟生成的影响。结果表明：随着氧体积分数的增加，火焰温度和碳烟体积分数显著增加，火焰高度显著降低，但与O_2/N_2相比，O_2/CO_2氛围下火焰温度和碳烟体积分数显著降低，火焰高度显著增加；O_2/CO_2氛围下通过CO_2热效应和化学效应影响火焰形态并降低关键组分H、OH自由基和C_2H_2的摩尔分数，CO_2主要通过降低H自由基摩尔分数从而影响碳烟质量成核率和表面生长速率，而不是通过促进碳烟氧化过程来抑制碳烟的生成。

Abstract

Oxygen-enriched combustion is considered as a potential clean combustion and carbon capture technology because of its advantages in strengthening combustion and reducing pollutant emissions. Based on the finite rate chemical reaction model

the soot formation in propane co-flow diffusion flame under two oxygenenriched conditions was numerically studied by using GRI-Mech3.0 gas phase reaction mechanism combined with detailed thermodynamic and transport data

and the non-reactive substance FCO_2 was constructed. The influence of CO_2 chemical effect on propane flame soot formation was investigated. The results show that

with the increase of oxygen volume fraction

the flame temperature and soot volume fraction increases significantly

and the flame height decreases significantly

but compared with O_2/N_2 atmosphere

the flame temperature and soot volume fraction decreases significantly and the flame height increases dramatically in O_2/CO_2 atmosphere. In O_2/CO_2 atmosphere

the CO_2 thermal effect and chemical effect influences the flame morphology and reduces the mole fraction of key components such as H

OH and C_2H_2. The CO_2 affects soot mass nucleation rate and surface growth rate mainly by reducing H mole fraction but not by promoting soot oxidation process.

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