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Numerical study on NOx/CO emissions in the diffusion flames of high-temperature off-gas of steelmaking converter

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  • Li, Sen
  • Wei, Xiaolin
  • Yu, Linxin

Abstract

The combustion of high-temperature off-gas of steelmaking converter with periodical change of temperature and CO concentration always leads to CO and NOx over-standard emissions. In the paper, high-temperature off-gas combustion is simulated by adopting counterflow diffusion flame model, and some influencing factors of CO and NOx emissions are investigated by adopting a detailed chemistry GRI 3.0 mechanism. The emission index of NOx (EINOx) decreases 1.7-4.6% when air stoichiometric ratio (SR) increase from 0.6 to 1.4, and it dramatically increases with off-gas temperature at a given SR when the off-gas temperature is above 1500Â K. High-concentration CO in off-gas can result in high NOx emissions, and NOx levels increase dramatically with CO concentration when off-gas temperature is above 1700Â K. Both SR and off-gas temperature are important for the increase of CO burnout index (BICO) when SR is less than 1.0, but BICO increase about 1% when off-gas temperature increases from 1100Â K to 1900Â K at SRÂ >Â 1.0. BICO increases with CO concentration in off-gas, and the influence of off-gas temperature on BICO is marginal. BICO increases with the relative humidity (RH) in air supplied, but it increases about 0.5% when RH is larger than 30%.

Suggested Citation

  • Li, Sen & Wei, Xiaolin & Yu, Linxin, 2011. "Numerical study on NOx/CO emissions in the diffusion flames of high-temperature off-gas of steelmaking converter," Applied Energy, Elsevier, vol. 88(4), pages 1113-1119, April.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:4:p:1113-1119
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    Cited by:

    1. Zaidani, Mouna & Tajik, Abdul Raouf & Qureshi, Zahid Ahmed & Shamim, Tariq & Abu Al-Rub, Rashid K., 2018. "Investigating the flue-wall deformation effects on performance characteristics of an open-top aluminum anode baking furnace," Applied Energy, Elsevier, vol. 231(C), pages 1033-1049.
    2. Tajik, Abdul Raouf & Shamim, Tariq & Zaidani, Mouna & Abu Al-Rub, Rashid K., 2018. "The effects of flue-wall design modifications on combustion and flow characteristics of an aluminum anode baking furnace-CFD modeling," Applied Energy, Elsevier, vol. 230(C), pages 207-219.

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