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

A dephosphorization converter and mass-energy conversion technology, which is applied in the manufacture of converters, energy efficiency improvement, waste gas treatment, etc., can solve the problems of low calorific value of gas, no economic value of recycling, pollution of the environment, etc., and achieve improved dephosphorization Effect of rate, favorable thermodynamic and kinetic conditions

Active Publication Date: 2017-09-12
UNIV OF SCI & TECH BEIJING +1
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AI Technical Summary

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

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Embodiment 1

[0034] A method for efficient dephosphorization of dephosphorized converter gas gas-energy conversion cycle multiple injection, said method is:

[0035] In the double steelmaking dephosphorization converter, the gas released from the dephosphorization converter is cooled and dedusted, and then burned in the combustion chamber with a combustion accelerant to convert the CO component in the released gas into CO 2 , the combustion chamber includes a combustion aid nozzle and an ignition device. The lining of the combustion chamber is made of refractory materials, and the shell is made of vaporization cooling pipes. Can convert gas;

[0036] After the mass-energy conversion gas is cooled and pressurized, part of it enters the dephosphorization converter bottom blowing system as the bottom blowing gas to realize the mass-energy conversion gas and bottom blowing stirring, and the other part mixes with oxygen and enters the dephosphorization converter top blowing system as the top bl...

Embodiment 2

[0062] This embodiment adopts the method and device in embodiment 1, and the specific conditions are:

[0063] For the 300t dephosphorization converter, the change of gas content in the blowing process is shown in Table 1. Gas instantaneous flow rate is 160000-190000Nm 3 / h, the gas passes through the vaporization cooling flue and the dry dust removal system to cool down and remove dust, then enters the combustion chamber through the release pipe, and uses 8 combustion nozzles to spray the combustion aid. Show.

[0064] Table 1 Dephosphorization converter gas and combustion aid flow rate

[0065]

[0066] Use the compressor to pressurize the mass-energy conversion gas to above 2.2MPa and store it in the buffer device, the average composition is CO 2 : 39%, N 2 : 59.25%, the rest is a small amount of residual gas. The mass-energy conversion gas is blown into the multi-component gas main pipe by jetting, and passes through the gas mixing device with oxygen, and the mixed...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C5/38C21C5/40C21C7/064
CPCC21C5/35C21C5/38C21C5/40C21C7/064C21C2100/02C21C2100/04Y02P10/25
Inventor 朱荣吕明刘润藻武文合王雪亮
Owner UNIV OF SCI & TECH BEIJING
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