An assessment of fuel variability effect on biogas-hydrogen combustion using uncertainty quantification
An assessment of fuel variability effect on biogas-hydrogen combustion using uncertainty quantification
复制标题
用不确定性量化方法评估燃料可变性对氢-甲烷燃烧的影响
DOI：
10.1016/j.ijhydene.2018.04.196
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发表时间：
2018-07
影响因子：
7.2
通讯作者：
Kai Zhang;Xi Jiang
中科院分区：
文献类型：
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作者：
Kai Zhang;Xi Jiang
采用全局灵敏度分析方法，定量研究了燃料成分波动对预混气-氢燃烧物理化学性质的影响。从统计学的角度研究了不同的氢添加比例和不同的CH 4：CO2比例在具有不确定性的甲烷-氢燃料中的作用。分析表明，氢燃料组成的微小波动不会导致层流火焰速度和绝热火焰温度等燃烧物理化学性质的显著波动。从贫燃到富燃的层流火焰速度波动的快速增长表明在富燃条件下火焰不稳定，低维研究表明氢的不确定性是火焰速度快速增长的主要原因。除了氢气的不确定性，它被发现，二氧化碳的浓度波动有一个更大的负面影响，稳定的瓦斯-氢火焰相比，甲烷。研究还发现，对于高氢含量的甲烷-氢燃料，CO2的变化对火焰速度波动的贡献减小，而甲烷的贡献增大。
Effects of fuel variability involving small fluctuations in fuel composition on physicochemical properties of premixed biogas-hydrogen combustion are quantified using global sensitivity analysis approach. Different proportions of hydrogen addition, and different CH4:CO2ratios in biogas-hydrogen fuel with uncertainties are investigated from a statistical point of view. Analyses show that small fluctuation of biogas-hydrogen fuel composition does not lead to significant fluctuations in physicochemical properties of combustion such as laminar flame speed and adiabatic flame temperature. A fast growth of laminar flame speed fluctuation from lean to rich combustion of biogas-hydrogen fuel is observed implying a less stable flame at rich condition, and lower dimensional studies show that hydrogen uncertainty takes predominant responsibility for the rapid increase of flame speed. Apart from the uncertainty of hydrogen, it is found that carbon dioxide concentration fluctuation has a larger negative effect on stabilising biogas-hydrogen flame compared to that of methane. It is also found that for biogas-hydrogen fuel with high hydrogen content, contribution of carbon dioxide variability to flame speed fluctuation decreases while methane contribution increases.