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Method for quickly reducing height of converter bottom

A converter bottom and high technology, applied in the direction of manufacturing converters, etc., can solve the problems of the influence of the slag splashing process, the difficult control of the oxygen lance position, and the large fluctuation of the metal liquid level, so as to avoid safety production accidents and increase the soaking erosion time. , The effect of reducing the height of the furnace bottom

Active Publication Date: 2018-12-07
MAANSHAN IRON AND STEEL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the converter enters the late stage of the furnace service, due to the serious and irregular lining erosion, it is necessary to install bricks or repair materials for lining maintenance many times, the change of furnace type leads to large fluctuations in the metal liquid level, the position of the oxygen lance is not easy to control, and the impact depth of the oxygen jet is not enough , the metal stagnation area in the furnace increases, which is easy to cause the bottom of the furnace to rise; (3) The impact of slag splashing process
The amount of slag remaining is too large. Due to the fast pace in front of the furnace, the time of slag splashing is shortened by feeding slag, and the slag is deposited on the bottom of the furnace, causing the bottom of the furnace to rise

Method used

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  • Method for quickly reducing height of converter bottom

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Experimental program
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Effect test

Embodiment 1

[0027] A method for rapidly reducing the bottom height of a converter, comprising the following steps:

[0028] 1) Measure the furnace bottom height

[0029] After tapping the steel in the upper furnace, the slag in the furnace is emptied, and the height of the furnace bottom is measured with a laser thickness gauge. When a new furnace is opened, the height of the furnace bottom is "0mm" as the benchmark, where "0mm" refers to the distance between the oxygen lance nozzles The metal liquid level of the molten pool is 1000mm; the measured furnace bottom height is +200mm, that is, the oxygen lance nozzle is 800mm away from the molten metal surface of the molten pool;

[0030] 2) Add molten iron

[0031] Add 800kg of molten iron into the converter;

[0032] 3) Oxygen blowing operation

[0033] Control oxygen flow rate 12000m 3 / h, the position of the oxygen lance is set to 2000mm. Press the "lower gun blowing" button, the oxygen gun will automatically drop to 2000mm and start...

Embodiment 2

[0043] A method for rapidly reducing the bottom height of a converter, comprising the following steps:

[0044] 1) Measure the furnace bottom height

[0045] After tapping the furnace, empty the slag in the furnace, and use a laser thickness gauge to measure the height of the furnace bottom. Taking the furnace bottom height "0mm" as the benchmark when opening a new furnace, the actual measured furnace bottom height is +400mm;

[0046] 2) Add molten iron

[0047] Add 1000kg of molten iron into the converter;

[0048] 3) Oxygen blowing operation

[0049] Control oxygen flow rate 13000m 3 / h, the position of the oxygen lance is set to 2000mm, press the button of "lower the gun blowing", the oxygen lance will automatically drop to 2000mm and open the oxygen, and the total amount of oxygen will reach 200m 3 Press and hold the "Oxygen Lance Up" button to increase the position of the oxygen lance to 2200mm, and the cumulative amount of oxygen reaches 600m 3, press the "Oxygen la...

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Abstract

The invention discloses a method for quickly reducing the height of a converter bottom. By utilizing the technological characteristics that the temperature rises quickly and a furnace clinker with thehigh FeO content is produced after reaction through the reaction of molten iron and oxygen, the thermodynamic conditions of high temperature and high FeO content required by eroding furnace bottom steel slags are met. Meanwhile, high-pressure oxygen is blown into a furnace through an oxygen lance, so that furnace bottom residual steel slags are favorably eroded and peeled off with the help of a favorable dynamic condition that an oxygen stream washes and stirs the furnace bottom steel residues. According to the method, on the premise of ensuring the safe, stable and efficient production of aconverter, the height of the converter bottom can be effectively reduced. Meanwhile, the method has the characteristics of high efficiency, low cost, safety and reliability.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking furnace condition maintenance technology, and in particular relates to a method for quickly reducing the height of the converter bottom. Background technique [0002] The bottom of the converter is too high, and the metal liquid level in the molten pool rises, resulting in a decrease in the volume ratio of the converter. If no effective measures are taken, the following adverse effects will be caused to the converter smelting operation: (1) The effective reaction space of the converter is reduced, and the probability of splashing is increased. , the metal yield decreases, and the consumption of steel materials increases; (2) It is difficult for the main operator of the converter to grasp the position of the blowing gun. It is very easy to scratch the nitrogen seal in the middle, and in severe cases, even the situation that the nitrogen seal cannot be raised, affecting normal producti...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/30C21C5/36
CPCC21C5/28C21C5/30C21C5/36
Inventor 邓南阳潘军张旭宋磊赵斌薛顺
Owner MAANSHAN IRON AND STEEL COMPANY
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