Features of exhaust gases afterburning in a converter when using two-tier oxygen lances for refining
| Autor: | E. V. Protopopov, M. V. Temlyantsev, N. F. Yakushevich, V. V. Solonenko, S. O. Safonov |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Izvestiya. Ferrous Metallurgy. 64:912-920 |
| ISSN: | 2410-2091 0368-0797 |
| Popis: | The theoretical substantiation was carried out for increasing the efficiency of converter gases afterburning in the unit with a twotier supply of multipulse oxygen jets and combustion of CO to CO2 in the channel flow of gases leaving the reaction zone. The authors made the thermodynamic analysis of the process of exhaust gases afterburning in converter cavity when using twotier oxygen lances for refining. It is shown that when oxygen gas jets are blown through the uppertier nozzles with a flow rate of 10 – 40 % of the total minute flow rate, a sufficiently complete afterburning of carbon monoxide CO is not provided. The limiting factors are the uneven amount and disorganized output of the CO formed in the reaction zones during various operation periods, low efficiency of mixing the waste stream with highspeed gas jets and an excessively excessive amount of oxygen supplied for afterburning, insufficient mixing of the components of the gas phase and low reaction rate. It is shown that when the conditions are provided for CO afterburning to the concentration ratio in the gas phase, temperature of the exhaust gas in the converter cavity can increase from 1800 to 2000 K, then the thermal effect of the exothermic reaction decreases. The amount of oxygen injected for CO afterburning must correspond to the residual carbon content in the metal at m3/min ≈ 100 [Сост ] %. Excess of oxygen in the gas phase and presence of a significant amount of neutral gas significantly reduce the utilization rate of the generated heat in the unit. |
| Databáze: | OpenAIRE |
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