摘要
以天然气掺氢技术为背景,构建一种非预混钝体同轴燃烧器及实验系统,测试了掺氢天然气(主要成分CH4)在不同燃料流速、掺氢比及当量比的火焰结构和污染物排放浓度,并考察了内构件对燃烧性能的影响。结果表明,掺氢后火焰高度降低,CO排放浓度降低,但NO_(x)排放浓度增加。当掺氢比达到80%时,与纯CH4相较,CO排放浓度降低93.5%,NO_(x)排放浓度增加1倍左右。随着燃料流速增加,火焰逐渐变长变宽,CO与NO_(x)排放浓度均增加;当量比<0.7时,随着当量比增加,燃烧室热损失降低,平均温度升高,CO排放浓度降低,而NO_(x)排放浓度增加;不同内构件的掺氢CH4燃烧性能差异较大,钝体—旋流内构件不仅可以降低51.9%的NO_(x)排放浓度,还可以增强燃烧的均匀程度及稳定性。研究结果对同轴燃烧器的设计、优化和应用具有参考意义,有助于推动天然气掺氢技术的发展。
A non-premixed bluff body coaxial burner and experimental system were developed to investigate the flame structure and pollutant emissions of hydrogen-blended natural gas,which is predominantly composed of CH 4,at different fuel flow rates,hydrogen blending ratios and equivalence ratios,against the background of hydrogen-blended natural gas technology.Additionally,the impact of internal components of the burner on combustion performance was examined.The results show that after the injection of hydrogen,the flame height decreases and concentration of CO emission is reduced,while concentration of NO_(x) emission increases.When the hydrogen blending ratio reaches 80%,concentration of CO emission is reduced by 93.5%,and concentration of NO_(x) emission approximately doubles.As the fuel flow rate increases,the flame gradually becomes longer and wider,and the concentrations of both CO and NO_(x) emission have increased.When the equivalence ratio is less than 0.7,as the equivalence ratio increases,the heat loss in combustion chamber decreases,the average temperature rises,the concentration of CO emission decreases,and the concentration of NO_(x) emission increases.The study also reveals that there are significant differences in the combustion performance of hydrogen-blended CH 4 among different internal components of the burner.In addition to reducing concentration of NO_(x) emission by 51.9%,the bluff body-swirler internal component also enhances combustion uniformity and stability.The research findings can offer valuable reference for design,optimization and application of coaxial burners,and contribute to the further advancement of hydrogen-blended natural gas technology.
作者
陈石义
何松
肖娟
王斯民
廖勇
CHEN Shiyi;HE Song;XIAO Juan;WANG Simin;LIAO Yong(Zhejiang Energy Gas Co.,Ltd.,Hangzhou,Zhejiang,310012,China;School of Chemical Engineering and Technology,Xi an Jiaotong University,Xi an,Shaanxi,710049,China;CPECC Southwest Company,Chengdu,Sichuan,610041,China)
出处
《天然气与石油》
2024年第5期88-96,共9页
Natural Gas and Oil
基金
浙江能源天然气集团有限公司支撑课题“天然气管道掺氢、输送、分离应用技术研究及浙能先导示范项目”(ZNKJ-2021-108)。
关键词
掺氢天然气
贫燃
非预混
当量比
钝体
污染物排放
Hydrogen-blended natural gas
Lean combustion
Non-premixed
Equivalence ratio
Bluff body
Pollutant emissions
