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Journal of Thermal Science

热科学学报

Journal of Thermal Science >

2024 , Vol. 33 >Issue 5: 1920 - 1934

DOI: https://doi.org/10.1007/s11630-024-2004-2

Effect of Oxygen-Rich Combustion on Flame Propagation of Syngas in a Half-Open Pipe at Elevated Temperatures

  • LI Ningning ,
  • DENG Haoxin ,
  • XU Zhuangzhuang ,
  • YAN Mengmeng ,
  • WEI Shengnan ,
  • SUN Guangzhen ,
  • WEN Xiaoping ,
  • GAN Haowen ,
  • WANG Fahui
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  • School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Online published: 2024-09-09

Supported by

This work was supported by the National Natural Science Foundation of China (No. 52004085).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Abstract

The investigation of syngas flame propagation has great benefits for the effective use of gas turbines. This essay sets out to study the flame propagation of premixed oxygen-rich combustion (oxygen enrichment coefficient in volume Ω: 0.21, 0.27, 0.32, 0.37) of syngas (H2:CO=2:8) in half-closed rectangular ducts at elevated temperatures (T: 300 K, 400 K, 500 K) and evaluate the effects of initial temperature and oxygen enrichment coefficient on the LBV from sensitivity analysis and kinetic analysis. This paper presents the effect of the expansion effect on laminar burning velocity for the first time, and separates the effect of the expansion effect on laminar burning velocity by a new method. Research shows that as the initial temperature goes up, the faster the exponential growth phase of the flame front velocity, the slower the slow growth phase. The smaller and earlier the maximum flame front velocity arrives, the slower the average flame speed is. As the oxygen enrichment coefficient goes up, the peak value of the flame front velocity gradually decreases. Oxygen-rich combustion and increasing initial temperature inhibit flame propagation in a half-open tube, but promote laminar burning velocity, which increases the key chemical bond and adiabatic flame temperature. The net reaction rate shows that oxygen-rich combustion mainly promotes the combustion reaction of H2(R2). However, increasing the initial temperature mainly promoted the oxidation of CO(R29). Analysis of the reaction path showed that oxygen-rich combustion and increased initial temperature promoted the reaction of H2 and CO with key chemical bonds, increased OH concentration, and inhibited OH cracking reaction.

Key words： gas turbines; oxyfuel combustion; numerical simulation; combustion kinetics; fire and flame

Cite this article

LI Ningning , DENG Haoxin , XU Zhuangzhuang , YAN Mengmeng , WEI Shengnan , SUN Guangzhen , WEN Xiaoping , GAN Haowen , WANG Fahui . Effect of Oxygen-Rich Combustion on Flame Propagation of Syngas in a Half-Open Pipe at Elevated Temperatures[J]. Journal of Thermal Science, 2024 , 33(5) : 1920 -1934 . DOI: 10.1007/s11630-024-2004-2

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