摘要
针对富氧氛围下甲烷燃烧特性及其最佳的富氧条件,分别在氧气含量为21％、24％、27％、30％、33％和36％条件下开展了甲烷点火延迟时间、绝热火焰温度、火焰传播速度、羟基生成率及氮氧化物排放等燃烧性能研究,并采用变异扰动法实现了不同富氧氛围对甲烷燃烧贡献的定量化表征和综合评估,同时基于敏感度分析和反应路径分析等途径揭示了富氧氛围对甲烷燃烧的关键反应和微观机制的影响规律.结果表明:富氧氛围显著缩短了甲烷的点火延迟时间,有利于羟基的生成,且有效提高了绝热火焰温度和火焰传播速度,但其却增大了氮氧化物的排放;同时在本研究工况范围内确定了 27％的含氧量是甲烷富氧燃烧的最佳氛围,动力学分析结果显示,富氧氛围对甲烷燃烧的重要路径影响不大,但会加快各通道的反应速率.
Abstract
To explore the combustion characteristics of methane in oxygen-enriched atmosphere and its optimal oxygen-enriched conditions,a series of studies on combustion performance of methane,such as ignition delay time,adiabatic flame temperature,laminar flame speed,hydroxyl production rate,and nitrogen oxides emissions,are conducted under the oxygen content conditions of 21％,24％,27％,30％,33％and 36％respectively.Quantitative characterization and comprehensive evaluation of the contribution of different oxygen-enriched atmospheres of methane combustion are conducted by using the revised variation disturbance method.Accordingly,the key reactions and chemical mechanisms of methane combustion in oxygen-enriched atmospheres are revealed through sensitivity analysis and reaction path analysis.The results show that the oxygen-enriched atmospheres are conducive to hydroxyl production and they can also significantly shorten the methane ignition delay time,and increase the adiabatic flame temperature and laminar flame speed of methane effectively,however,they could increase the emission of nitrogen oxides.The oxygen content of 27％is found to be the best atmosphere for methane oxygen-enriched combustion within the working conditions described in the paper.The kinetic analysis shows that the oxygen-enriched atmospheres have no significant effect on the important reaction paths of methane combustion,but they could improve the reac-tion rates of each channel.This comprehensive research based on variation disturbance method can provide a new research approach and reference for the application of oxygen-enriched combustion technology.
基金项目
河南省自然科学基金面上项目(242300420050)
河南省高等学校重点科研项目(24A590006)
河南省高等学校重点科研项目(24B470010)
河南省重点研发与推广专项(科技攻关)(222102210050)
河南省重点研发与推广专项(科技攻关)(232102320199)
NETL
NSTL
万方数据