Effect of CO2 Opposing Multiple Jets on Thermoacoustic Instability and NOx Emissions in a Lean-Premixed Model Combustor

  • ZHOU Hao ,
  • HU Liubin
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  • Institute for Thermal Power Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

网络出版日期: 2024-01-16

基金资助

This work was supported by the National Science Fund for Distinguished Young Scholars (Grant No. 51825605).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Effect of CO2 Opposing Multiple Jets on Thermoacoustic Instability and NOx Emissions in a Lean-Premixed Model Combustor

  • ZHOU Hao ,
  • HU Liubin
Expand
  • Institute for Thermal Power Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Online published: 2024-01-16

Supported by

This work was supported by the National Science Fund for Distinguished Young Scholars (Grant No. 51825605).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

本文通过实验研究了贫预混模型燃烧器中CO2对冲多孔射流对热声不稳定性和NOx排放的影响。从CO2射流流量、孔数和喷嘴孔径三个变量方面验证了其可行性。结果表明,随着开孔率的增加,热声不稳定性和NOx排放的控制效果总体上呈相反趋势,CO2对冲多孔射流的最佳射流流量范围为1-4 L/min。在该流量范围内,动态压力和热释放信号CH*的幅值和频率基本上随着CO2流量的增加而减小,这避免了高频和高振幅的热声不稳定性。在最佳开孔率为3.72%下,动态压力和CH*的幅值抑制比分别高达98.75%和93.64%。NOx排放也随着射流流量的增加而减少,最大抑制率可达68.14%。此外,在CO2对冲多孔射流作用下,火焰形状从陡峭的倒“V”形变为更平坦的“M”形,火焰长度将变得更短。该研究实现了热声不稳定性和NOx排放的同步控制,可为构建更安全、更清洁的燃烧器提供设计参考。

本文引用格式

ZHOU Hao , HU Liubin . Effect of CO2 Opposing Multiple Jets on Thermoacoustic Instability and NOx Emissions in a Lean-Premixed Model Combustor[J]. 热科学学报, 2024 , 33(1) : 207 -221 . DOI: 10.1007/s11630-023-1882-z

Abstract

This paper experimentally studied the effect of CO2 opposing multiple jets on the thermoacoustic instability and NOx emissions in a lean-premixed model combustor. The feasibility was verified from three variables: the CO2 jet flow rate, hole numbers, and hole diameters of the nozzles. Results indicate that the control effect of thermoacoustic instability and NOx emissions show a reverse trend with the increase of open area ratio on the whole, and the optimal jet flow rate range is 1–4 L/min with CO2 opposing multiple jets. In this flow rate range, the amplitude and frequency of the dynamic pressure and heat release signals CH* basically decrease as the CO2 flow rate increases, which avoids high-frequency and high-amplitude thermoacoustic instability. The amplitude-damped ratio of dynamic pressure and CH* can reach as high as 98.75% and 93.64% with an optimal open area ratio of 3.72%. NOx emissions also decrease as the jet flow rate increases, and the maximum suppression ratio can reach 68.14%. Besides, the flame shape changes from a steep inverted “V” to a more flat “M”, and the flame length will become shorter with CO2 opposing multiple jets. This research achieved the synchronous control of thermoacoustic instability and NOx emissions, which could be a design reference for constructing a safer and cleaner combustor.

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