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Smelting method for reducing explosion venting occurrence rate of converter

A smelting method and a technology of occurrence rate, which are applied in the smelting field to reduce the incidence of explosion venting of converters, can solve the problems of lower production efficiency, interruption of converter production, and high incidence of explosion venting, and achieve low production costs, lower incidence of explosion venting, highly operable effect

Active Publication Date: 2021-08-06
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of smelting method that reduces the occurrence rate of converter explosion venting in view of the high incidence of explosion venting in the current converter smelting process, which leads to the interruption of converter production and reduces the production efficiency. It is a systematic improvement on how to prevent explosion venting in the smelting process, which makes up for the shortcomings of other steelmaking methods. It is simple and safe to operate, can effectively avoid explosion venting, and can be popularized and used

Method used

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  • Smelting method for reducing explosion venting occurrence rate of converter

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Embodiment 1

[0030] In this embodiment, the single slag smelting method is taken as an example to describe the method of the present invention in detail.

[0031] The smelting furnace No. 1 is smelted by the single slag method, and the blowing end point is ≤0.12%. The specific operation includes the following steps:

[0032] (1) Control of adding steel scrap and adding iron

[0033] ①Adding scrap steel operation: After adding scrap steel, in order to effectively bake the scrap steel, remove the moisture in the scrap steel (to avoid the generation of H 2 ), after adding scrap steel, slowly shake the furnace until the tilting angle is 80°, and attention should be paid to avoiding the fume hood at the furnace mouth to prevent H 2 Enter the fume hood, and then slowly shake the furnace to the waiting position to add iron;

[0034] ②Molten iron mixing operation: After mixing the molten iron, do not shake the furnace body immediately, first slowly shake the furnace body at a small angle (the sh...

Embodiment 2

[0045] This embodiment takes double slag smelting as an example to describe the method of the present invention in detail.

[0046] The smelting furnace No. 2 is smelted by the double slag method, and the blowing end point of the blowing furnace is C>0.12%. The specific operation includes the following steps:

[0047] (1) Control of adding steel scrap and adding iron

[0048] ①Adding scrap steel operation: After adding scrap steel, in order to effectively bake the scrap steel, remove the moisture in the scrap steel (to avoid the generation of H 2 ), after adding scrap steel, shake the furnace slowly until the tilting angle is 85°, and attention should be paid to avoiding the fume hood at the furnace mouth to prevent H 2 Enter the fume hood, and then slowly shake the furnace to the waiting position to add iron;

[0049] ②Molten iron mixing operation: After mixing the molten iron, do not shake the furnace body immediately, first slowly shake the furnace body at a small angle (...

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Abstract

The invention provides a smelting method for reducing the explosion venting occurrence rate of a converter. The smelting method comprises the following steps that (1) the processes of adding waste steel and iron are controlled, specifically, after the waste steel is added, alloy is effectively baked, and H2 is prevented from entering a smoke hood in the process; and after molten iron is added, a converter body is slowly shaken for 1.5-2.5 min at a small angle, and after flame at a converter opening becomes small, the converter body is shaken to be upright for blowing; (2) the blowing process is controlled, specifically, (i) small-flow blowing starting ignition is conducted, (ii) a low-flow blowing platform is arranged, (iii) after blowing is started for 65-70s, an oxygen valve continues to be increased till the oxygen flow is 32000Nm < 3 > / H, (iv) after blowing is started for 0-150s, the smoke hood is lifted; and (v) normal blowing is conducted; and (3) the blowing end point is controlled, specifically, (i) if the first-time pouring C is smaller than or equal to 0.12%, a normal blowing mode is adopted for re-blowing, and (ii) if the first-time pouring C is larger than 0.12%, the interval time between re-blowing and first-time pouring is larger than or equal to 3min, and (4) in the blowing process, secondary gun discharging operation is conducted in the double-slag process. According to the smelting method, the explosion venting prevention smelting method is adopted, the explosion venting occurrence rate is greatly reduced, converter production is stable, and the production operation rate and the smooth operation rate are increased.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a smelting method for reducing the occurrence rate of converter explosion venting. Background technique [0002] At present, the converter dedusting system of most iron and steel enterprises adopts the dry dedusting process. The dry dedusting is mainly responsible for the collection, purification and recovery of the flue gas generated in the converter smelting process. Compared with the converter wet dedusting, it has obvious water and energy saving. Electricity, low maintenance, and low dust content in the external discharge, etc., but because the dry dust removal uses an electrostatic precipitator, it has extremely high requirements for the operation of the converter. If operations such as adding slag, adding scrap steel, and mixing iron are not properly controlled, explosion venting will occur and steelmaking production will be interrupted. Explosion venting i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/32C21C5/38
CPCC21C5/28C21C5/32C21C5/38
Inventor 汪晛何兴中方建红韦泽洪金海兵黄高见
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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