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Peculiarities of Exhaust Gases Afterburning in Converter with Application of Two-Tier Oxygen Lance Blowing

Abstract—We perform a theoretical substantiation of the efficiency increase of the converter gas afterburning in the installation supplying two-tier, different impulse oxygen jets, with CO combustion to CO2 in the channel gas flow leaving the reaction zone. We analyze the thermodynamics of the exhaust gases afterburning process in the converter bath when using (for the blowing) the two-tier oxygen lances. When the oxygen gas jets are blown through the nozzles of the upper tier with the flow rate of 10–40% of the total minute consumption, then sufficiently complete afterburning of the carbon monoxide, CO, is not provided. The uneven amount and unorganized output of the CO formed in the reaction zones during the operation, low efficiency of the exhaust stream mixing with the high-velocity gas jets and the far excessive oxygen amount supplied for the afterburning, insufficient mixing of the gas phase components, and low reaction rate are the limiting factors. We show that at providing conditions for the CO afterburning to the \(\frac{{{{P}_{{{\text{C}}{{{\text{O}}}_{{\text{2}}}}}}}}}{{{{P}_{{{\text{CO}}}}}}}\) = 1 ratio of concentration in the gas phase, the exhaust gas temperature in the converter bath might increase from 1800 to 2000 K; furthermore, the thermal effect of the exothermic reaction decreases. The oxygen amount injected for the CO afterburning should respect to the residual carbon content in the metal under the condition of \(V_{{{{{\text{O}}}_{2}}}}^{{{\text{add}}}}\), m3/min ≈ 100[Cres]%. The oxygen excess in the gas phase and significant amount of the neutral gas reduce essentially the coefficient of utilization of the heat released in the facility.

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Authors ORCID ID. E.V. Protopopov (0000-0002-7554-2168), M.V. Temlyantsev (0000-0001-7985-5666).

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Correspondence to E. V. Protopopov, M. V. Temlyantsev, N. F. Yakushevich, V. V. Solonenko or S. O. Safonov.

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Translated by I. Dikhter

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Protopopov, E.V., Temlyantsev, M.V., Yakushevich, N.F. et al. Peculiarities of Exhaust Gases Afterburning in Converter with Application of Two-Tier Oxygen Lance Blowing. Steel Transl. 51, 872–878 (2021). https://doi.org/10.3103/S0967091221120093

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  • DOI: https://doi.org/10.3103/S0967091221120093

  • Keywords: converter
  • two-tier lance
  • afterburning of exhaust gases
  • gas jets
  • carbon monoxide
  • enthalpy
  • Gibbs energy