Combustion of hydrogen-enriched methane in a lean premixed swirl-stabilized burner
Combustion of hydrogen-enriched methane in a lean premixed swirl-stabilized burner
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DOI：
10.1016/s1540-7489(02)80108-0
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
R. Schefer;D. M. Wicksall;A. Agrawal
中科院分区：
文献类型：
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作者：
R. Schefer;D. M. Wicksall;A. Agrawal
在贫燃料条件下，研究了预混旋流稳定火焰的燃烧特性，以确定富氢甲烷的效果。燃烧器由一个带有环形预混燃料-空气射流的中心体组成。使用45度旋流叶片将旋流引入流中。燃烧发生在大气压下的空气冷却石英室内。得到了不同氢添加量和不同燃料空气流量下的火焰稳定性和熄火图。获得气体探针测量以证明在CO浓度的减少与氢气的添加，而不会产生不利影响的NOx排放。通过直接发光照片和OH自由基平面激光诱导荧光测量，描述了贫稳定极限附近的火焰结构。结果表明，在甲烷/空气混合物中加入适量的氢气会增加峰值OH浓度。氢的加入导致火焰结构的显着变化，由更短和更强大的出现火焰表示。所观察到的趋势与使用RUN-1DL的应变对置预混火焰分析一致。计算结果表明，用氢气富集甲烷增加了火焰的应变电阻以及火焰中的OH水平。
The combustion characteristics of a premixed, swirl-stabilized flame were studied to determine the effects of enriching methane with hydrogen under fuel-lean conditions. The burner consisted of a center-body with an annular, premixed fuel-air jet. Swirl was introduced to the flow using 45-degree swirl vanes. The combustion occurred within an air-cooled quartz chamber at atmospheric pressure. Flame stability and blowout maps were obtained for different amount of hydrogen addition at several fuel-air flow rates. Gas probe measurements were obtained to demonstrate reductions in CO concentration with hydrogen addition, without adversely affecting the NOxemissions. The flame structure near the lean stability limit was described by direct luminous photographs and planar laser-induced fluorescence measurements of the OH radical. Results show that the addition of a moderate amount of hydrogen to the methane/air mixture increased the peak OH concentration. Hydrogen addition resulted in a significant change in the flame structure, indicated by a shorter and more robust appearing flame. The observed trends concur with the strained opposed premixed flame analysis using RUN-1DL. The computations revealed that enriching the methane with hydrogen increased the strain resistance of the flame as well as the OH levels in the flame.