Method for avoiding explosion venting of electrostatic dust collector in iron mixing process of converter

A technology of electrostatic precipitator and converter, which is applied in the fields of electrostatic precipitator explosion venting and converter steelmaking, which can solve problems such as electrostatic precipitator explosion venting, affecting the smooth progress of production, and intensifying carbon-oxygen reactions.

Active Publication Date: 2015-08-12
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the returned slag is added into the furnace together with the scrap steel, because the returned slag contains a large amount of low-melting point compounds and higher ferrous oxide, which intensifies the carbon-oxygen reaction in the iron mixing process, increases the amount of CO generated, and increases the CO and o 2 Probability of Mixed Venting
[0005] The explosion venting of the electrostatic precipitator in the process of adding iron to the converter is a serious safety hazard in the operation of leaving slag and iron, which has not been completely solved so far. to be resolved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The final temperature of upper furnace is 1662℃, and the oxygen activity of molten steel is 876×10 -6 144kg of carbon-containing magnesium balls and 480kg of raw dolomite are added during slag splashing, and the slag is poured out after slag splashing.

[0029] (2) Semi-steel conditions: temperature 1348°C, main components C: 3.88%, Si: 0.01%, Mn: 0.02%, V: 0.027%, Ti: 0.002%, semi-steel weight 130t, smelt Q235B, confirm to add converter and return Slag 6240kg.

[0030] (3) Select the cooling material operation, the opening of the secondary dedusting valve is 75%, the speed of the primary dedusting fan is set at 600r / min, after adding the returned slag, shake the furnace at a low speed to the tapping side at -87°, and then to the ironing side Shake the furnace at 90°, and then shake the furnace to -84° at the tapping side, and then stop at 42° at the iron mixing side to wait for semi-steel mixing.

[0031] (4) After the semi-steel is mixed with steel flow, the sem...

Embodiment 2

[0035] (1) The final temperature of the upper furnace is 1654°C, and the oxygen activity of molten steel is 523×10-6 During the slag splashing process, 300kg of carbon-containing magnesium balls and 240kg of raw dolomite were added, and 40% of the slag was reserved (the slag pouring angle was 108°).

[0036] (2) Semi-steel conditions: temperature 1363°C, main components C: 3.79%, Si: 0.01%, Mn: 0.01%, V: 0.021%, Ti: 0.002%, semi-steel weight 132t, smelting Q235B, confirm to add converter and return Slag 5100kg.

[0037] (3) Select the cooling material operation, the opening of the secondary dedusting valve is 75%, the speed of the primary dedusting fan is set to 600r / min, after adding the returned slag, shake the furnace at a low speed to the tapping side at -86°, and then to the ironing side Shake the furnace at 88°, and stop at 42° to wait for the semi-steel.

[0038] (4) After the half-steel is mixed with steel flow, the half-steel is slowly mixed after a pause of 5 second...

Embodiment 3

[0043] (1) The final temperature of the upper furnace is 1652°C, and the oxygen activity of molten steel is 242×10 -6 During slag splashing, 360kg of carbon-containing magnesium balls and 120kg of raw dolomite are added, and the amount of slag reserved is 100%.

[0044] (2) Semi-steel conditions: temperature 1359°C, main components C: 3.91%, Si: 0.01%, Mn: 0.01%, V: 0.030%, Ti: 0.001%, semi-steel weight 133t, smelting Q235B, confirm to add converter and return Slag 3600kg.

[0045] (3) Select the cooling material operation, the opening of the secondary dedusting valve is 75%, the speed of the primary dedusting fan is set at 600r / min, after adding the returned slag, shake the furnace at a low speed to the tapping side at -87°, and then to the ironing side Shake the furnace at 89°, and stop at 42° to wait for the semi-steel.

[0046] (4) After the half-steel is mixed with steel flow, the half-steel is slowly mixed after a pause of 5 seconds.

[0047] (5) The carbon-oxygen rea...

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Abstract

A method for avoiding explosion venting of an electrostatic dust collector in iron mixing process in a converter belongs to the technical filed of converter steelmaking methods, is used to prevent explosion venting of the electrostatic dust collector in the iron mixing process in the converter. The technical scheme is as follows: by reducing the thermal state furnace slag of FeO enrichment and control of the semisteel mixing speed, CO generated during the semisteel mixing process can be reduced; and by manual adjustment of the opening of a secondary dedusting valve and the rotating speed of a dust removal fan, the CO generated during the semisteel mixing process minimally enters the electrostatic dust collector so as to avoid reaching CO and O2 mixed gas venting explosion condition. By optimizing slag remaining and iron mixing operation, CO content in the electrostatic precipitator is controlled below 9%, CO and O2 mixed gas explosion condition can be effectively avoided, the slag remaining operation and the explosion venting of the electrostatic dust collector in the semisteel mixing process in the converter under the conditions using converter returning slag as a cold material can be avoided, and the role of stabilizing converter production rhythm, reducing the damage of dust removal equipment, and prolonging service life can be played.

Description

technical field [0001] The invention relates to a method for avoiding explosion venting of an electrostatic precipitator in the process of adding iron to a converter based on the operation of leaving slag in semi-steelmaking and using the slag returned from a converter as a cold material, and belongs to the technical field of converter steelmaking methods. Background technique [0002] The molten iron produced by blast furnace smelting vanadium-titanium magnetite contains vanadium, titanium, chromium and other elements. In order to extract vanadium in molten iron, a dual process is generally adopted, that is, the molten iron first extracts vanadium, and then uses semi-steel to make steel. There are traces of elements such as silicon and manganese in semi-steel after vanadium extraction, and the content of oxides such as silicon dioxide and manganese oxide in the slag during the steelmaking process is very small, resulting in a single component of the slag and high viscosity, ...

Claims

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Application Information

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IPC IPC(8): C21C5/28
Inventor 吴雨晨雷爱敏孙福振张志新韩佳高晓丽
Owner HEBEI IRON AND STEEL
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