Research of microflame low-emission natural gas combustion technology adapted for chinese-type power boilers
DOI:
https://doi.org/10.31548/energiya2(84).2026.057Keywords:
microflame combustion, low-emission burner, natural gas, nitrogen oxides, CFD simulation, excess air ratio, temperature field, CFD-моделювання, температурне полеAbstract
The relevance of the study is обусловлена the need to reduce nitrogen oxide emissions during natural gas combustion in thermal power installations and to improve the energy and environmental efficiency of gas-fired equipment. The implementation of low-emission combustion technologies capable of ensuring stable fuel combustion with minimal pollutant formation is of particular importance. The aim of the study is to investigate the processes of microflame low-emission natural gas combustion and to evaluate the efficiency of a high-velocity jet burner in reducing NOx formation, equalizing the temperature field, and improving the environmental characteristics of the combustion process. To achieve this goal, numerical CFD simulation of combustion processes was carried out in the ANSYS Fluent software environment using the RANS approach and the standard k–ε turbulence model. The influence of burner geometric parameters and excess air ratio on the temperature regime and NOx formation processes was investigated. Experimental studies of a 200 kW microflame burner were performed using a GASMET DX4000 gas analyzer. It was established that the proposed burner design ensures the formation of multiple microflames, intensifies fuel-air mixing, and provides a more uniform temperature distribution in the combustion chamber. It was determined that the most efficient operating mode is achieved with an air channel diameter of 16 mm and an excess air ratio of α ≈ 1.4. The obtained results showed that the NOx concentration in combustion products does not exceed 50 mg/m³, which complies with current requirements for low-emission combustion technologies. The practical significance of the study lies in the possibility of using the proposed microflame burners for modernization of existing thermal engineering installations and improvement of the environmental safety of natural gas combustion processes.
Recieved: 03.01.2026. Recieved: 09.03.2026. Accepted: 17.04.2026.
References
1. DAI Dong⁃hua , CHEN Bin⁃bin , HE Hai⁃feng , et al. (2024).Numerical Simulation of Combustion Performance of New Low⁃nitrogen Gas Burner. Power System Engineering. 40 (5) , September 2024, 7-9.
2. Zhai S, Jacob J D, Wang X, et al.(2021). Control of particulate nitrate air pollution in China [J]. Nature Geoscience, 14(6):389-395.
3. ZHANG Jun Xia , ZHANG Jiang Feng. (2016). Analysis of Chemical Reaction Kinetics Behavior of Nitrogen Oxide During Air-staged Combustion in Pulverized Boiler [J]. Bulletin of Chemical Reaction Engineering & Catalysis, 11(1): 2-4.
4. Deng Xin-hua Li Kan-ping. (2019). Development and Application of Low Nitrogen Gas Burner. Energy Conservation & Environmental Protection, 2019 (09) 82-83
5. Monika Zajemska, Dorota Musia & Anna Poskart. (2014). Effective methods of reduction of nitrogen oxides concentration during the natural gas combustion. Environmental Technology, 35 (5), 602–610,
6. Riazi R, Farshchi M, Shimura M, et al. (2017). An Experimental Study on Combustion Dynamics and NOx Emission of a Swirl Stabilized Combustor with Secondary Fuel Injection[J].Journal of Thermal ence and Technology, 5(2):266-281.
7. QIAOFangqi ,MICuili ,WUZhe ,CUIHaiting ,ZHANG Kai ,WUJinghao ,JIANG Jingzhi.(2025). Influence of gas staged coupling swirl structure on combustion performance. Journal of Hebei University of Scienceand Technology. 46 (6), 684-693.
8. KAMAL M M,MOHAMAD A A. (2006). Combustionin porous media[J]. Proceedings of the Institution of Mechanical Engineers , PartA: Journal of Powerand Energy, 220(5):487- 508.
9. Taras Kravets, Igor Galyanchuk, Oksana Yurasova, Andrii Kapustianskyi, Kateryna Romanova (2022).. The heat-transfer system modelling of the convective heating surfaces of a TP-92 steam boiler. Polityka Energetyczna – Energy Policy Journal; 25(3):5–20. DOI: https://doi.org/10.33223/epj/152899
10. NGUYENT H,PARKJ,JUNGS,et al. (2019). Anumerical study on NOx formation behavior in a lean-premixed gas turbine combustorusing CFD-CRN method[J]. Journal of Mechanical Science and Technology, 33(10):5051-5060.
11. Solero G, Coghe A. (2000). Effect of injection typology on turbulent homogeneous mixing in a natural gas swirl burner[J]. Experimental Thermal and Fluid Science, 21(3),162- 170.
12. Al-Abdeli Y, Masri A R. (2003). Stability characteristics and flowfields of turbulent nonpremixed swirling flames[J]. Combustion Theory and Modelling, 7(4),731-766.
13. QIAOFangqi ,MICuili ,WUZhe ,CUIHaiting ,ZHANG Kai ,WUJinghao ,JIANGJingzhi (2025). Influence of gas staged coupling swirl structure on combustion performance. Journal of Hebei University of Scienceand Technology, 46 (6), 684-693.
14. NIANTengfei,LIJinggao,LIPing,et al. (2024). Numerical simulation of CH4 non-premixed combustion process considering chemical reaction model. ContemporaryChemicalIndustry, 53 (9):2181-2189.
15. ZHENG Jianxiang, GENG Ruyi, ZHANG Chi, et al. (2019). Simulation study on the formation of soot in non-premixed methane turbulent diffusion flame. Journal of Northeast Electric Power University, 39(6), 37-43.
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