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Study on the feasibility of the micromix combustion principle in low NOx H2 burners for domestic and industrial boilers: A numerical approach

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  • Lopez-Ruiz, G.
  • Alava, I.
  • Blanco, J.M.

Abstract

The purpose of the present investigation is to explore the feasibility of applying the micromix combustion principle (MCP) to design low NOx burners using 100% H2 as fuel for domestic and industrial boilers. Previous investigations studying the MCP on stationary and aero gas turbine applications, showed low NOx emissions without flashback risk, which represent the two main issues when burning 100% H2. Since boiler burner operating conditions differ from gas turbine combustors, the present paper studies the MCP through CFD calculations under re-defined conditions for domestic and industrial burners, adapting the energy densities, air-fuel equivalence ratios and pre-heated air temperatures. A reference geometry was built to validate the selected numerical models with experimental results from literature. Afterwards, burners were re-dimensioned following an existing geometry-scaling methodology. The obtained results evidenced that MCP characteristics were still maintained for the defined cases, keeping low NOx values between 4 and 14 ppm. The numerical results were also validated through experimental NOx measurements in a laboratory scale micromix burner prototype. In order to assess the benefits of using hydrogen micromix burners in domestic and industrial boilers, the present work includes a final discussion with practical design considerations. The present study lays the groundwork for complementary experimental research work, which is being carried out in laboratory-scale prototypes.

Suggested Citation

  • Lopez-Ruiz, G. & Alava, I. & Blanco, J.M., 2021. "Study on the feasibility of the micromix combustion principle in low NOx H2 burners for domestic and industrial boilers: A numerical approach," Energy, Elsevier, vol. 236(C).
    • Handle: RePEc:eee:energy:v:236:y:2021:i:c:s0360544221017047
    DOI: 10.1016/j.energy.2021.121456
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    Cited by:

    1. Lopez-Ruiz, G. & Alava, I. & Blanco, J.M., 2023. "Impact of H2/CH4 blends on the flexibility of micromix burners applied to industrial combustion systems," Energy, Elsevier, vol. 270(C).
    2. Tang, Zhenhao & Sui, Mengxuan & Wang, Xu & Xue, Wenyuan & Yang, Yuan & Wang, Zhi & Ouyang, Tinghui, 2024. "Theory-guided deep neural network for boiler 3-D NOx concentration distribution prediction," Energy, Elsevier, vol. 299(C).
    3. Gontzal Lopez-Ruiz & Joseba Castresana-Larrauri & Jesús María Blanco-Ilzarbe, 2022. "Thermodynamic Analysis of a Regenerative Brayton Cycle Using H 2 , CH 4 and H 2 /CH 4 Blends as Fuel," Energies, MDPI, vol. 15(4), pages 1-11, February.
    4. Xiao, Guolin & Gao, Xiaori & Lu, Wei & Liu, Xiaodong & Asghar, Aamer Bilal & Jiang, Liu & Jing, Wenlin, 2023. "A physically based air proportioning methodology for optimized combustion in gas-fired boilers considering both heat release and NOx emissions," Applied Energy, Elsevier, vol. 350(C).
    5. Deymi-Dashtebayaz, Mahdi & Rezapour, Mojtaba & Sheikhani, Hamideh & Afshoun, Hamid Reza & Barzanooni, Vahid, 2023. "Numerical and experimental analyses of a novel natural gas cooking burner with the aim of improving energy efficiency and reducing environmental pollution," Energy, Elsevier, vol. 263(PE).
    6. Chen, Xuanren & Wang, Hui & Wang, Xiangyu & Liu, Xiang & Zhu, Yuxuan, 2023. "Fuel/air mixing characteristics of a Micromix burner for hydrogen-rich gas turbine," Energy, Elsevier, vol. 282(C).

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