Experimental Study on Chemiluminescence Properties of Ammonia-Methane Non-Premixed Laminar Flames

Haihang Su, Yuxuan Wu, Jinzhi Yan and Liqiao Jiang ()
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Haihang Su: College of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
Yuxuan Wu: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Jinzhi Yan: College of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
Liqiao Jiang: College of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

Energies, 2025, vol. 18, issue 2, 1-13

Abstract: The fundamental investigation on the chemiluminescence characteristics of NH 3 -based flames is essential for the development of low-cost, real-time optical diagnostic sensor technologies. In this study, we have experimentally examined the chemiluminescence properties of non-premixed ammonia-methane laminar jet flames under various initial NH 3 blending ratios ( X NH 3 from 0.2 to 1.0 in volume) by conducting the emission spectrum analysis within the 200–800 nm band and capturing the distribution images of key excited radicals. The results revealed that the emission spectra of OH*, CH*, CN*, NH*, and NH 2 * were clearly identifiable. As anticipated, the chemiluminescence characteristics of NH 3 -CH 4 non-premixed flames were significantly influenced by X NH 3 ; i.e., the overall signal intensity decreased monotonically within the 200–400 nm band but increased within the 400–800 nm band as X NH 3 increased. The signal intensity characteristics of OH*, CH*, NH*, and NH 2 *, indicated by radical images, were consistent with the spectrometer measurements. Particularly, it was found that the intensity ratio of CH*/NH 2 * was an ideal marker of initial X NH 3 in present flames, given their sensitivity with X NH 3 and relative ease of measurement with the cost-effective sensors designed for invisible wavelengths. Moreover, in the flame front, CH* was located in the oxidant side, while NH 2 * was in the fuel side with a broader distribution zone. An increase of X NH 3 led to greater flame thickness and shifted the peak position of excited radicals far away from the fuel side.

Keywords: chemiluminescence; excited radicals; ammonia-methane ratio; non-premixed flame (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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