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Study of NO and CO Formation Pathways in Jet Flames with CH 4 /H 2 Fuel Blends

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  • Lin Lu

    (School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333001, China)

  • Haoyuan Jiang

    (School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333001, China)

Abstract

The existing natural gas transportation pipelines can withstand a hydrogen content of 0 to 50%, but further research is still needed on the pathways of NO and CO production under moderate or intense low oxygen dilution (MILD) combustion within this range of hydrogen blending. In this paper, we present a computational fluid dynamics (CFD) simulation of hydrogen-doped jet flame combustion in a jet in a hot coflow (JHC) burner. We conducted an in-depth study of the mechanisms by which NO and CO are produced at different locations within hydrogen-doped flames. Additionally, we established a chemical reaction network (CRN) model specifically for the JHC burner and calculated the detailed influence of hydrogen content on the mechanisms of NO and CO formation. The findings indicate that an increase in hydrogen content leads to an expansion of the main NO production region and a contraction of the main NO consumption region within the jet flame. This phenomenon is accompanied by a decline in the sub-reaction rates associated with both the prompt route and NO-reburning pathway via CH i=0–3 radicals, alongside an increase in N 2 O and thermal NO production rates. Consequently, this results in an overall enhancement of NO production and a reduction in NO consumption. In the context of MILD combustion, CO production primarily arises from the reduction of CO 2 through the reaction CH 2 (S) + CO 2 ⇔ CO + CH 2 O, the introduction of hydrogen into the system exerts an inhibitory effect on this reduction reaction while simultaneously enhancing the CO oxidation reaction, OH + CO ⇔ H + CO 2 , this dual influence ultimately results in a reduction of CO production.

Suggested Citation

  • Lin Lu & Haoyuan Jiang, 2024. "Study of NO and CO Formation Pathways in Jet Flames with CH 4 /H 2 Fuel Blends," Energies, MDPI, vol. 17(17), pages 1-19, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:17:p:4382-:d:1469178
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    1. Gao, Xuan & Duan, Fei & Lim, Seng Chuan & Yip, Mee Sin, 2013. "NOx formation in hydrogen–methane turbulent diffusion flame under the moderate or intense low-oxygen dilution conditions," Energy, Elsevier, vol. 59(C), pages 559-569.
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