CH4/O2/CO2扩散火焰的熄火特性研究
Study on Extinction Limits Characteristics of CH4/O2/CO2 Diffusion Flame
DOI: 10.12677/aep.2025.1512178, PDF,    科研立项经费支持
作者: 王硕超, 王景甫*, 李 翼, 陈纪全：北京工业大学机械与能源工程学院，北京；陈 颖：北京市科学技术研究院城市安全与环境科学研究所，北京
关键词: 氧燃料；辐射热损失；拉伸熄火极限；辐射熄火极限；高温氧化剂；Oxy-Fuel； Radiative Heat Loss； Stretch Extinction Limit； Radiative Extinction Limit； High Temperature Oxidizer
摘要: 为了减少CO2和其他污染物的排放，提出并开发了一种新型燃烧技术，即使用O2/CO2替代空气作为氧化剂与碳捕获和封存技术(CCS)相结合。使用Chemkin Pro软件数值计算获得了CH4/CO2和O2/CO2逆流扩散火焰的熄火极限。结果表明，火焰的过度拉伸和低拉伸率下的辐射热损失都会使得火焰熄灭。当拉伸率足够大，接近拉伸熄火极限时，可以近似忽略辐射作用。拉伸熄火极限主要受添加CO2稀释效应的影响，而辐射熄火极限则由CO2气体的辐射效应而变化。反应R99 (CO2 + H = CO + OH)对燃烧过程释热的影响随着CO2浓度的升高而变大。氧化剂初始温度的升高，拉伸熄火极限的变化值大于辐射熄火极限，整体可燃区域拓宽。反应R38 (H + O2 = O +OH)在任何条件下都是燃烧过程中最重要的基元反应。
Abstract: To reduce the emissions of CO2 and other pollutants, a novel combustion technology has been proposed and developed, which involves using O2/CO2 instead of air as the oxidizer in combination with carbon capture and storage technology. The extinction limits of CH4/CO2 and O2/CO2 counterflow diffusion flames were numerically calculated using Chemkin Pro. The results indicate that both excessive flame stretching and radiative heat loss at low strain rates can lead to flame extinction. When the strain rate is sufficiently high and approaches the stretch extinction limit, the effect of radiation can be neglected. The stretch extinction limit is primarily influenced by the dilution effect of added CO2, while the radiative extinction limit varies due to the radiative effect of CO2 gas. The influence of reaction R99 (CO2 + H = CO + OH) on the heat release during combustion increases with higher CO2 concentrations. As the initial temperature of the oxidizer increases, the change in the stretch extinction limit is greater than that of the radiative extinction limit, resulting in an overall broadening of the flammable region. Reaction R38 (H + O2 = O + OH) remains the most important elementary reaction in the combustion process under all conditions.
文章引用：王硕超, 王景甫, 陈颖, 李翼, 陈纪全. CH4/O2/CO2扩散火焰的熄火特性研究[J]. 环境保护前沿, 2025, 15(12): 1651-1663. https://doi.org/10.12677/aep.2025.1512178

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