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Effects of different preheated CO2/O2 jet in cross-flow on combustion instability and emissions in a lean-premixed combustor
Journal of the Energy Institute ( IF 5.7 ) Pub Date : 2020-07-23 , DOI: 10.1016/j.joei.2020.07.006
Chengfei Tao , Hao Zhou

To reveal the suppression mechanism of thermoacoustic instability flames under CO2/O2 jet in cross flow. Experiments on the effects of different preheated CO2/O2 jet in cross-flow (JICF) on combustion instability and NOx emissions in a lean-premixed combustor were conducted in a model gas turbine combustor. Two variables of the JICF were investigated—the flow rate and the temperature. Results indicate that combustion instability and NOx emissions could be suppressed when the JICF flow rate increases from 1 to 5 L/min. The average pressure amplitude decreases from 18.6 Pa to 1.6 Pa, and the average NOx emission decreases from 26.4 ppm to 12.1 ppm. But the average pressures amplitude and NOx emissions increase as the JICF temperature grows up. The sound pressure and the flame heat release rate exhibits different mode-shifting characteristics. The oscillation frequency of the sound pressure almost unchanged under JICF injection. However, the oscillation frequency of the heat release rate jumps from 95 Hz to 275 Hz under different JICF temperatures. As the CO2/O2 JICF flow rate arrived 3 L/min, the oscillation frequency of flame heat release rate jumps from 85 Hz to 265 Hz. The color of the flame fronts and roots were changed by the JICF injection. The average length of flame under CO2/O2 JICF cases is shorter than the N2/O2 JICF cases. There are three different modes of flames when the CO2/O2 JICF flow rate varies, and two different modes of flames when the CO2/O2 JICF temperature varies. This article explored the joint effects of different CO2/O2 or N2/O2 JICF on combustion instability and NOx emissions, which could be instructive to the designing of safely and clean combustors in industrial gas turbines.



中文翻译:

错流中不同的预热CO 2 / O 2射流对稀薄预混燃烧器燃烧不稳定性和排放的影响

揭示在横流中CO 2 / O 2射流下热声不稳定性火焰的抑制机理。横流(JICF)中不同的预热CO 2 / O 2射流对燃烧不稳定性和NO x影响的实验稀薄预混燃烧器中的废气排放是在模型燃气轮机燃烧器中进行的。研究了JICF的两个变量-流量和温度。结果表明,当JICF流量从1 L / min增加到5 L / min时,燃烧不稳定性和NOx排放可以得到抑制。平均压力幅度从18.6 Pa降低到1.6 Pa,平均NOx排放量从26.4 ppm降低到12.1 ppm。但是,随着JICF温度的升高,平均压力幅值和NOx排放量也会增加。声压和火焰放热率表现出不同的模式转换特性。在JICF注入下,声压的振荡频率几乎不变。然而,在不同的JICF温度下,放热速率的振荡频率从95Hz跃升至275Hz。作为CO2 / O 2 JICF流量达到3 L / min,火焰放热速率的振荡频率从85 Hz跃升至265 Hz。JICF注入改变了火焰前缘和根部的颜色。CO 2 / O 2 JICF情况下的平均火焰长度比N 2 / O 2 JICF情况下的平均火焰长度短。当CO 2 / O 2 JICF流量变化时,存在三种不同的火焰模式,而当CO 2 / O 2 JICF温度变化时,存在两种不同的火焰模式。本文探讨了不同的CO 2 / O 2或N 2 / O 2的联合效应 JICF有关燃烧不稳定性和NOx排放的信息,这对设计工业燃气轮机中安全清洁的燃烧器具有指导意义。

更新日期:2020-07-23
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