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Effects of flue gas internal recirculation and fuel staging on low-nitrogen combustion characteristics of natural gas
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Junhao PENG1, Jiankun ZHUO2, Jingyu GUAN3, Zhenzhou PANG3, Wei LI3, Lingkun ZHU3, Qiang YAO1, 2
Thermal Power Generation | 2025, 54(2) : 57 - 67
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Thermal Power Generation | 2025, 54(2): 57-67
• Thermal energy science research •
Effects of flue gas internal recirculation and fuel staging on low-nitrogen combustion characteristics of natural gas
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Junhao PENG1, Jiankun ZHUO2, Jingyu GUAN3, Zhenzhou PANG3, Wei LI3, Lingkun ZHU3, Qiang YAO1, 2
Affiliations
  • 1.The College of Electrical Engineering, Xinjiang University, Urumqi 830046, China
  • 2.Key Lab of Thermal Science and Power Engineering of MOE, Tsinghua University, Beijing 100084, China
  • 3.State Key Laboratory of Low-carbon Thermal Power Generation Technology and Equipments, Harbin Boiler Ltd., Harbin 150040, China
Published: 2025-02-25 doi: 10.19666/j.rlfd.202406134
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An axial tangentially swirl low nitrogen burner is designed based on flue gas internal circulation and staged combustion, and the effects of the burner’s load, fuel staging, and recycled high-temperature flue gas on combustion and NOx emission characteristics are studied through industrial experiments and numerical simulations. The results indicate that, the loads and fuel staging ratios have a synergistic effect on NOx generation. Under medium and low load conditions, the NOx emissions increase monotonically with the secondary fuel ratio, large amount of NOx generates in the secondary flame zone. At full load, there exists an optimal primary to secondary fuel ratio (88:12), which minimizes the NOx emissions. When the secondary fuel ratio falls below 12%, the primary flame zone becomes dominant in NOx production. The length of the primary fuel mixing pipe can alter the fuel and air mixing process, thereby affecting NOx generation. When the relative length of primary fuel mixing pipe is shortened to 0.74, the main combustion zone moves upstream in the furnace, and the main flame is anchored in the middle of the furnace, resulting in a more uniform temperature distribution at the rear of the furnace. The NOx emission mass concentration decreases by 10%~20% across all loads, all below 30 mg/m³ (with O2 volume fraction of 3.5%, the NOx is calculated as NO2).

flue gas internal recirculation  /  axial vortex flow  /  staged combustion  /  low nitrogen combustion
Junhao PENG, Jiankun ZHUO, Jingyu GUAN, Zhenzhou PANG, Wei LI, Lingkun ZHU, Qiang YAO. Effects of flue gas internal recirculation and fuel staging on low-nitrogen combustion characteristics of natural gas[J]. Thermal Power Generation, 2025 , 54 (2) : 57 -67 . DOI: 10.19666/j.rlfd.202406134
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  • National Key Research and Development Program(2022YFB4003900)
Appendix
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Year 2025 volume 54 Issue 2
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Article Info
doi: 10.19666/j.rlfd.202406134
  • Receive Date：2024-06-01
  • Online Date：2026-03-06
  • Published：2025-02-25
Article Data
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History
  • Received：2024-06-01
Funding
National Key Research and Development Program(2022YFB4003900)
Affiliations
    1.The College of Electrical Engineering, Xinjiang University, Urumqi 830046, China
    2.Key Lab of Thermal Science and Power Engineering of MOE, Tsinghua University, Beijing 100084, China
    3.State Key Laboratory of Low-carbon Thermal Power Generation Technology and Equipments, Harbin Boiler Ltd., Harbin 150040, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
Number of
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Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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