共查询到19条相似文献,搜索用时 187 毫秒
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进气温度对微燃机燃烧室燃烧特性的影响分析 总被引:1,自引:0,他引:1
本文通过实验研究了在保持微型燃气轮机燃烧室出口排气温度不变的情况下,改变进口空气温度对燃烧室燃烧特性的影响.结果表明,随着燃烧室进气温度的增大,燃烧效率提高,燃烧室出口温度不均匀性系数减小,热阻增大,总压恢复系数有所降低.同时,实验结果还表明,随着燃烧室进口空气温度的增大,燃烧室出口处CO及未燃烬碳(UHC)排放浓度显著降低,但NO排放浓度则增大.根据实验结果,本文还分析了进气温度的改变对燃烧室燃烧特性的影响规律,为今后微型燃气轮机燃烧室的研制及改进提供了参考依据. 相似文献
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O2/CO2循环燃烧中NOx的中试实验研究 总被引:2,自引:0,他引:2
O2/CO2 循环燃烧技术不仅便于回收烟气中 CO2,还能大幅度减少 SO2 和 NOx 排放.在国内第一台中试规模O2/CO2 循环燃烧台架上,对炉膛内部不同燃烧区域和尾部烟气的 NOx 排放进行研究.结果表明,本实验台架燃烧一段是 NOx 排放的重点提升区,Air 气氛下 NOx 浓度上升了 109.7%,在 O2/CO2 和 O2/RFG 气氛下 NOx 浓度没有明显增加,分别上升 23.2% 和 21.6%,燃烧二段 NOx 浓度基本没发生变化.尾部烟气中,与 Air 工况相比,O2/CO2 循环燃烧工况下脱硝率为 83.41%,另外喷钙对 NOx 的脱除也有不同程度的提升. 相似文献
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进气中CO2浓度对预混合燃烧和排放影响的试验和模拟研究 总被引:4,自引:0,他引:4
本文研究了进气中CO2浓度对燃烧和排放特性的影响.研究表明在所有的预混合燃料比下,当CO2浓度增加时,NOx排放随之大幅减少,烟度排放有小的变化。利用KIVA3V和湍流与化学反应交互的燃烧模型对柴油机预混合燃烧进行了模拟研究,对缸内OH浓度的模拟计算表明,随着CO2浓度的增加,着火前期OH生成浓度明显向后推移,这表明燃料的氧化速率随CO2浓度的增加变慢,从而延长了着火滞燃期。进气中CO2浓度变大时,燃烧温度降低,有利于降低NOx的排放。 相似文献
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燃气轮机的燃烧噪声是反映燃烧室燃烧稳定性的主要参数.本文对国内某座煤基IGCC示范电站的40 MW级燃气轮机在诸多运行条件下的燃烧噪声进行了现场测试,分析了气液双燃料喷嘴在燃烧轻柴油、燃烧合成气以及油气切换过程中燃烧室的燃烧噪声,另外分析了合成气掺烧驰放气与合成气加湿对燃烧稳定性的影响.结果表明:合成气燃烧室在油气切换过程中燃烧噪声会增加,但距离振荡燃烧的阈值仍有很大的裕度;烧合成气时随着燃气轮机功率增加燃烧噪声降低;合成气加湿时随着蒸汽流量增加污染物NOx排放显著降低,并且燃烧噪声也有降低的趋势. 相似文献
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燃油分级多点喷射低污染燃烧室的化学反应网络模型分析 总被引:4,自引:0,他引:4
本文采用基于详细化学反应机理的化学反应网络模型分析了航空发动机燃油径向分级多点喷射低污染燃烧室的NO_x排放特性。该分级燃烧室不同于传统燃烧室,头部由值班区和主燃区两个不同的燃烧区域,根据CFD得到的流场特性和当量比的分布特性对燃烧室进行分区构建化学反应器网络模型,研究了值班级当量比以及值班级和主燃级两级供油比例对排放的影响。同时,还分析了空气进口温度对NO_x排放的影响。得到了较为合理的变化趋势,为低污染燃烧室的初步设计提供了有益的指导。 相似文献
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I. A. Fedorov Yu. P. Maksimov N. E. Tret’yakov A. L. Étsina A. P. Zhevlakov 《Optics and Spectroscopy》2002,93(6):947-954
The spectral characteristics of radiation generated by supersonic cw HF lasers are experimentally investigated at different basic operating parameters. It is demonstrated that the emission spectrum substantially depends on both the degree of dilution of a fuel mixture with helium in a combustion chamber of the atomic-fluorine generator and the chemical composition of an active medium. The range of variations in the secondary fuel (hydrogen) excess factor in which the lines weakly absorbed by the atmosphere are characterized by the largest fraction of the power of generated radiation is determined. 相似文献
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V. E. Kozlov A. B. Lebedev A. N. Sekundov K. Ya. Yakubovskii 《Russian Journal of Physical Chemistry B, Focus on Physics》2010,4(4):602-612
A one-dimensional problem of propagation of a laminar flame front through a uniform methane-air mixture was solved using the
GRI-Mech 3.0 reaction mechanism. An analysis of the composition of the combustion products behind the flame front at a pressure
of 10 atm, an initial mixture temperature of 600 K, and two values of the air-to-fuel equivalence ratio (α = 1.8 and 2.5)
was performed. It was demonstrated that, at short residence times, the carbon oxide emission increases as the mixture is made
leaner, with the opposite tendency being observed at long residence times. Numerical calculations of the characteristics of
turbulent flow and combustion in two axisymmetric homogeneous-combustion model chambers with relatively long residence times
were performed within the framework of a bulk (quasi-laminar) combustion model. In calculations, the methane-air mixture composition
and the wall temperature of one of the chambers were varied. The case of cooling air inflow through the chamber wall was considered.
It was demonstrated that, over a wide range of parameters in the combustion chamber and on its wall, the CO emission monotonically
decreases as the degree of mixture leaning grows, but it increases when the chamber wall is cooled and when cooling air is
blown through the wall. 相似文献
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Franois Lacas Bertrand Leroux Nasser Darabiha 《Proceedings of the Combustion Institute》2005,30(2):2037-2045
The influence of oxidizer dilution in oxy-liquid ethanol flames is experimentally investigated by using a coaxial air-assisted injector positioned in a vertical combustion chamber. This study accounts for the influence of a two-phase mode since two different injector geometries are used: for the first configuration, a vaporization mode is observed at nominal power in oxy conditions, while for the second one, a brush mode is observed. Dilution with air is applied by keeping oxidizer velocity constant. Flame structure is observed through CH emission: dilution leads to an increase in the flame diameter, and collective effects of two-phase combustion are encouraged. The effect of dilution on oxy flame stability is also studied: for a given oxygen mass fraction in the oxidizer, the oxidizer flow rate is increased until extinction occurs. Dilution leads to a less stable flame, which may be essentially explained by the decrease in laminar flame speed with dilution. For high oxidizer dilution levels, the change in flame structure might be another parameter to consider. Finally, species concentrations are measured using a standard gas sampling technique. NO and CO evolutions with dilution are different between both two-phase combustion regimes. An empirical approach based on thermal NO mechanism and CO oxidation reaction enables one to explain the evolutions for brush mode. For vaporization mode, the residence time in burned gases is also to be considered. 相似文献