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Experimental and numerical study of combustion and emission characteristics of biomass gasification gas blended with natural gas in a non-premixed burner

Author

Listed:
  • Fan, Haodong
  • Zhang, Han
  • Zhang, Xiong
  • Luo, Zixue
  • Shao, Jingai
  • Liu, Hao
  • Tu, Yaojie
  • Zhang, Shihong

Abstract

Combining the burning of biomass gasification gas with natural gas can increase the calorific value of gasification gas while also lowering pollutants and carbon emissions, making it a win-win approach. Traditional burners, on the one hand, can only burn one gas and so cannot satisfy the requirements for efficient, clean, and steady co-combustion. Furthermore, the co-combustion features, pollutant emission process, and co-combustion mechanism of natural gas and biomass gasification gas remain poorly known. This study proposed a new porous non-premixed burner geometry and conducted numerical simulation and experimental research to determine the effects of various burner loads, excess air coefficients, and biomass gasification gas blending ratios on flame structure, flue gas velocity, radical fraction, and emission performance (CO and NO). Results indicate that the optimal excess air coefficient and biomass gasification gas blending ratio are 1.2–1.4 and 10 %–40 %, respectively. When the surplus air coefficient is 1.4, the CO emission concentration when 70 % biomass gas is combined is approximately 18.71 times that of 40 %, and the NO emission concentration can be as low as 2.5 ppm. Meanwhile, the lowest NO emission concentration reached 2.5 ppm. An air staging ratio of 10–20 % can reduce NO emissions by 20 %. Fluent simulation demonstrates that the Mech2.11 mechanism accurately reveals the combustion and NO emission characteristics at various blending ratio. In addition, the novel burner has been successfully used in a 65 t/h alumina calcining furnace. The newly developed burner maintains steady flame properties under a variety of operating circumstances. The simulation results show that when the blending ratio of biomass gasification gas is 30 %, the optimal calcination temperature of alumina is 1000 °C–1200 °C, and the new burner reduces NO emissions by 48 % compared to traditional natural gas combustion. This study gives theoretical information on the possibility of using non-premixed burners in conventional businesses.

Suggested Citation

  • Fan, Haodong & Zhang, Han & Zhang, Xiong & Luo, Zixue & Shao, Jingai & Liu, Hao & Tu, Yaojie & Zhang, Shihong, 2026. "Experimental and numerical study of combustion and emission characteristics of biomass gasification gas blended with natural gas in a non-premixed burner," Renewable Energy, Elsevier, vol. 256(PB).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:pb:s0960148125016350
    DOI: 10.1016/j.renene.2025.123971
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