Multi-element-injection efficient dephosphorization method and device for dephosphorization converter gas mass energy conversion cycle

Abstract

The invention belongs to the technical field of ferrous metallurgy and relates to a multi-element-injection efficient dephosphorization method and device for the conversion cycle of dephosphorization converter gas mass energy of duplex steelmaking. According to the multi-element-injection efficient dephosphorization method and device, dephosphorization converter gas enters a combustion chamber after being subjected to cooling and dedusting, the gas CO component is converted into CO2 in the combustion chamber, meanwhile heat generated during combustion is recycled, dephosphorization converter gas mass energy conversion is achieved, the injection and dephosphorization of multiple gas elements of O2, N2 and CO2 of the converted gas are achieved through a dephosphorization converter top-blowing system, bottom blowing stir of the mass energy conversion gas is achieved through a bottom blowing system, and the multi-element-injection process is controlled in a sectioned manner. The method and device are suitable for 30-350-ton dephosphorization converter, the strong stir and temperature control functions of N2 and CO2 in the mass energy conversion gas are used, the good thermodynamics and kinetics conditions are provided for dephosphorization, the dephosphorization rate is increased over 5%, the resource utilization of steel with dephosphorization gas of 10-50 Nm<3> / t is achieved, and steel with the quantity of steam of 5-20 kg / t of is recovered.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy technology and energy saving and emission reduction, especially in the aspect of steelmaking dephosphorization pretreatment, and particularly relates to a 30-350 ton dephosphorization converter gas gas energy conversion cycle suitable for dephosphorization in double steelmaking technology A method and device for realizing high-efficiency dephosphorization and recycling of gas resources by multi-component top blowing and bottom blowing in the phosphorus process. Background technique [0002] Dephosphorization in the converter steelmaking process is mainly carried out under low temperature conditions in the early stage of smelting. If the flow rate of oxygen supply is large, the dephosphorization reaction is easily restricted by the thermodynamic conditions of the rapid temperature rise of the molten pool after the desiliconization reaction, which makes it difficult to control the temperature...

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Problems solved by technology

[0003] The dephosphorization converter can produce 20-40m of gas for every ton of steel produced 3 , the gas contains CO 5%-30%, CO 2 10%-30%, the rest is mainly N 2 and trace O 2 , due to the low calorific value of dephosphorization converter gas, it does not have the economic value of recycling. At present, domestic and foreign iron and steel enterprises adopt emission treatment, which not only causes waste of resources and energy, but also pollutes the environment.

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