Method for preventing explosion venting after converter blowing interruption

A converter blowing and explosion venting technology, which is applied in the metallurgical field, can solve problems such as equipment accidents, explosion venting, dry dust removal, carbon-oxygen reaction explosion venting, etc., and achieve the effects of stable smelting control, smooth production organization, and prevention of explosion venting

Inactive Publication Date: 2018-03-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The explosion venting control of the converter system equipped with dry dedusting has always been the key control point of the dry dedusting steel plant. However, due to the actual conditions of the molten iron and equipment conditions in the steelmaking process, after the converter smelting was interrupted, the oxygen-reducing lance was blown again. The phenomenon of venting occurs from time to time
The main reason is that when the blowing process of the converter is interrupted, when the blowing process is interrupted again, a large amount of CO is generated due to the intense reaction of carbon and oxygen, which causes the carbon and oxygen reaction explosion venting of the dry dust removal, which not only easily causes equipment accidents, but also directly affects the smooth progress of the converter production

Method used

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  • Method for preventing explosion venting after converter blowing interruption
  • Method for preventing explosion venting after converter blowing interruption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. When the blowing is resumed after the blowing is interrupted, shake the converter to zero.

[0020] 2. Select the manual "slag splashing" mode for the oxygen lance, and the position of the oxygen lance is 2.5m away from the furnace mouth.

[0021] 3. Manually open the valve to blow nitrogen, the nitrogen flow rate is 40000Nm3 / h, the nitrogen blowing time is 3.5min, and a nitrogen curtain is made in the flue.

[0022] 4. After the nitrogen blowing is over, the oxygen lance selects the manual "blowing" mode.

[0023] 5. When blowing oxygen with the oxygen-reducing lance, the position of the oxygen lance and the flow rate of oxygen are controlled according to the automatic mode, and the flow rate of oxygen blowing and gas analyzer O are as listed in the table below. 2 The corresponding relationship between content and oxygen lance position is carried out for blowing:

[0024] Oxygen blowing flow Nm3 / h

[0025] 6. When O in the gas analyzer 2 The content is ...

Embodiment 2

[0027] 1. When the blowing is resumed after the blowing is interrupted, shake the converter to zero.

[0028] 2. Select the manual "slag splashing" mode for the oxygen lance, and the position of the oxygen lance is 2.8m away from the furnace mouth.

[0029] 3. Manually open the valve to blow nitrogen, the nitrogen flow rate is 43000Nm3 / h, the nitrogen blowing time is 3.2min, and a nitrogen curtain is made in the flue.

[0030] 4. After the nitrogen blowing is over, the oxygen lance selects the manual "blowing" mode.

[0031] 5. When blowing oxygen with the oxygen-reducing lance, the position of the oxygen lance and the flow rate of oxygen are controlled according to the automatic mode, and the flow rate of oxygen blowing and gas analyzer O are as listed in the table below. 2 The corresponding relationship between content and oxygen lance position is carried out for blowing:

[0032] Oxygen blowing flow Nm3 / h

[0033] 6. When O in the gas analyzer 2 The content is ...

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PUM

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Abstract

The invention provides a method for preventing explosion venting after converter blowing interruption. Under the condition of lance lifting in the time period from the time when converter blowing is conducted for 5 min to the time when the carbon content of molten steel is higher than 0.2%, namely after converter blowing interruption, a converter is shaken to the zero position during next blowing,an oxygen lance adopts a manual slag splashing mode, a valve is manually opened for nitrogen blowing, and a nitrogen screen is manufactured in a flue; after nitrogen blowing is completed, the oxygenlance adopts a manual blowing mode; when the oxygen lance is descended for oxygen blowing, the oxygen lance position and oxygen flow are controlled in an automatic mode; and after the O2 content in agas analysis meter is lower than 6% and the oxygen blowing flow reaches 40000 Nm<3>/h, control over the oxygen lance position and oxygen flow is switched into a manual control mode. Through the method, carbon-oxygen reactions in the converter can be prevented from being too intensely, thus, the CO generation speed is slowly increased, the explosion venting limit of CO and O2 in smoke is passed, the explosion venting phenomenon is prevented, zero explosion venting of dry dedusting after blowing interruption is achieved, smelting control is stabilized, and whole operation of dry method dust blowing equipment is ensured.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preventing explosion venting after converter blowing interruption of dry dust removal. Background technique [0002] Converter blowing interruption refers to the situation where the gun is lifted during the period from 5 minutes after converter blowing to the time when the carbon content in molten steel is greater than 0.2%. The explosion venting control of the converter system equipped with dry dedusting has always been the key control point of the dry dedusting steel plant. However, due to the actual conditions of the molten iron and equipment conditions in the steelmaking process, after the converter smelting was interrupted, the oxygen-reducing lance was blown again. Explosion venting occurs from time to time. The main reason is that when the blowing process of the converter is interrupted, when the blowing process is interrupted again, a large am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
CPCC21C5/30
Inventor 王小善何海龙王成青舒耀高洪涛李泊朱国强李冰曹林
Owner ANGANG STEEL CO LTD
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