Numerical Study of Combustion Characteristics of Methane/Hydrogen Hybrid Fuel of Lean Premixed Swirl

doi:10.16183/j.cnki.jsjtu.2022.502

Abstract

Abstract:

The numerical simulation method is used to study the influence of the mixing ratio of methane/hydrogen mixture on the combustion characteristics and pollutant emission characteristics of the combustor. The results show that due to the action of combustion chemical reaction, there exists a certain difference in the structure of cold and hot flow fields. The flow velocity of the hot flow field increases, and the recirculation zone becomes larger. The hydrogen content has a significant impact on the structure and temperature distribution characteristics of the hot flow field, and a central recirculation zone is formed when the hydrogen content is less than 20%, which can maintain stable combustion. When the hydrogen content is greater than 40%, the central recirculation zone disappears, the external recirculation zone is extended, and the spontaneous combustion and flashback occur to varying degrees. As the inlet air temperature increases, the spontaneous ignition phenomenon becomes more obvious, and the inlet air temperature decreases, the flashback phenomenon becomes more obvious. NO_x emissions increase with the increase of hydrogen content, CO emissions decrease with the increase of hydrogen content, and CO is concentrated in the combustion zone of the main combustion stage.

Key words: lean premixed combustion, hydrogen, combustion characteristics, spontaneous ignition, flashback

CLC Number:

WANG Xinci, LIU Aiguo, WU Xiaoqu, ZHANG Yunjie. Numerical Study of Combustion Characteristics of Methane/Hydrogen Hybrid Fuel of Lean Premixed Swirl[J]. Journal of Shanghai Jiao Tong University, 2024, 58(8): 1179-1187.

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组分	密度/ (kg·m^-3)	热值/ (kJ·m^-3)	摩尔质量/ (g·mol^-1)	燃料流量/ (g·s^-1)
100%CH₄+0%H₂	3.671	35 906	16	60.8
80%CH₄+20%H₂	3.029	30 884	13.2	59.0
60%CH₄+40%H₂	2.389	25 816	10.4	56.5
40%CH₄+60%H₂	1.744	20 839	7.6	52.5
20%CH₄+80%H₂	1.101	15 816	4.8	45.6
0%CH₄+100%H₂	0.459	10 794	2	30.4