METHOD AND APPARATUS FOR HIGH-EFFICIENCY DEPHOSPHORIZATION BY MASS-ENERGY CONVERSION CYCLING AND MULTI-COMPONENT BLOWING FOR DEPHOSPHORIZATION CONVERTER GAS

摘要

The invention belongs to the technical field of ferrous metallurgy, and relates to a method and device for mass-energy conversion recycling of duplex steelmaking dephosphorization converter gas for diversified blowing so as to realize efficient dephosphorization. According to the invention, the dephosphorization converter gas enters a combustion chamber after being cooled and dedusted, the CO component of the gas is converted into CO₂ in the combustion chamber, the heat generated by combustion is recovered at the same time, and then mass-energy conversion of the dephosphorization converter gas is realized; and the converted gas passes through a top blowing system of the dephosphorization converter to realize diversified gas O₂-N₂-CO₂ blowing dephosphorization, bottom blowing stirring of the mass-energy converted gas is realized through a bottom blowing system, and the diversified blowing process is controlled in stages. The method is suitable for a 30-350 ton dephosphorization converter, and the strong stirring and temperature control effects of N₂ and CO₂ in the mass-energy converted gas are utilized to provide good thermodynamic and dynamic conditions for dephosphorization, thus improving the dephosphorization rate by 5% or above, recycling dephosphorization gas of 10-50 Nm³/t steel, and recovering steam of 5-20 kg/t steel.