Parametric Analysis of Flashback Propensity With Various Fuel Compositions and Burner Materials
Parametric Analysis of Flashback Propensity With Various Fuel Compositions and Burner Materials
复制标题
各种燃料成分和燃烧器材料的回火倾向的参数分析
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
V. McDonell
中科院分区：
文献类型：
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作者：
Z. Duan;A. Kalantari;V. McDonell
回火是富氢燃料低氮氧化物预混燃烧的一个关键的可操作性问题。先前的工作系统地研究了燃料成分对回火倾向的影响，并注意到回火与燃烧器尖端温度的耦合。它产生了临界速度梯度模型，作为闪回倾向的指标，作为研究参数的函数，例如燃料成分、燃烧器尖端温度和层流火焰速度等。目前的工作进一步分析现有数据，并开发了作为无量纲群函数的闪回倾向的经验物理模型。进行了全面的参数筛选，并将决定闪回行为的潜在变量分为五种类型：操作参数、未燃烧条件、环境条件、钻机特性等。分析的目的是预测给定未燃烧条件下的关键操作参数，这些参数通常是硬件设计人员已知的。其他因素，例如环境条件和钻机属性也可能影响预测性能。为了考虑这些因素，根据白金汉 Pi 定理进行量纲分析。选择临界Damkohler数作为回火倾向的指标，并建立模型表明优先扩散（Le）、热损失显示公式（TuT0）、热耦合效应显示公式（TtipTu）和火焰佩克莱数（Pef）的重要性如下：公式Da=Const.·Le-6.12·TuT0-1.71·TtipTu-3.69Pef1.89·f1θ′d·f2PuP0最后，给出了压力影响的初步结果。© 2015 ASME
Flashback is a key operability issue for low NOx premixed combustion of hydrogen enriched fuels. Previous work has systematically investigated the impact of fuel composition on flashback propensity and noted the coupling of flashback with burner tip temperature. It led to models for critical velocity gradient as an indicator of flashback propensity as a function of parameters studied, such as fuel composition, burner tip temperature and laminar flame speed, etc. The present work further analyzes existing data and develops an empirical physical model for flashback propensity as a function of dimensionless groups. A comprehensive parameter screening is conducted and the potential variables determining flashback behavior are catalogued into five types: operational parameters, unburnt conditions, ambient conditions, rig properties and others. The objective of the analysis is to predict the critical operational parameters with given unburnt conditions which are generally known to the hardware designer. Other factors, such as ambient conditions and rig properties might also affect the prediction performance. To account for such factors, a dimensional analysis is conducted based on Buckingham Pi theorem. The critical Damkohler number is selected as the indicator of flashback propensity and a model is developed suggesting the significance of preferential diffusion (Le), heat loss Display Formula(TuT0), thermal coupling effect Display Formula(TtipTu) and flame Peclet number (Pef) as follows:Display FormulaDa=Const.·Le-6.12·TuT0-1.71·TtipTu-3.69Pef1.89·f1θ′d·f2PuP0Finally, preliminary results for pressure effects are presented.© 2015 ASME